PCB/Rev.E2: Add BOM

Develop

.gitignore

@@ -0,0 +1,22 @@
+*.cod
+*.hex
+*.lst
+*.o
+*.diff
+.DS_Store
+*.o65
+*.ips
+*.bin
+*.map
+*.o.d
+*.log
+*.smc
+*.sfc
+*~
+*.old
+*.elf
+*.img
+autoconf.h
+utils/rle
+utils/derle
+*.bit

CHANGELOG

@@ -15,6 +15,7 @@ v0.1.1a (bugfix release)
 v0.1.2
 ======
 
+ * New menu entry: "System Information"
  * Auto region override (eliminate "This game pak is not designed..." messages)
  * Improved mapper detection (fixes Batman vs. Joker and many PD ROMs)
  * Improved data streaming performance
@@ -22,3 +23,59 @@ v0.1.2
  * A and B buttons swapped in menu to match common key mappings
  * Fixes:
    - MSU1: Stop audio playback on end of audio file
+
+
+v0.1.3
+======
+
+ * Updated logo gfx with new version from klaptra
+ * Updated font to distinguish between 1 and I
+ * Menu layout adjusted to move status line up by 4 scanlines
+ * Run previously loaded game by pressing Start in the menu
+ * Auto-scroll file names that do not fit the screen
+ * SD access time measurement on System Information screen (takes a while!)
+ * Cx4 memory map: mirror ROM to 40-7e/c0-ff (fixes MMX3 Zero patch)
+ * Some FPGA configuration error detection (mainly useful for hardware diag)
+ * Fixes:
+   - FPGA-side SD clock pullup (increases reliability with some cards)
+
+
+v0.1.4
+======
+
+ * SPC Player (contributed by necronomfive/blargg)
+ * System Information screen now shows CPU/PPU revision (contributed by necronomfive)
+ * Satellaview: basic data transmission packet support (makes some more games boot, thanks to LuigiBlood for assistance and sample data packets)
+ * Number of supported files increased to 50000 per card / 16380 per directory
+ * Slight speedup of menu text rendering
+ * Reduce load time of menu
+ * Adjust Cx4 timing to be more faithful
+   (Mega Man now defeats the boss in attract mode in Mega Man X2)
+ * adapt ROM mirroring size to file size if header information is invalid
+   (fixes Super Noah's Ark 3D, possibly others)
+ * MSU1 interface changes suggested by byuu:
+   - Data offset 0 and audio track 0 are automatically requested on reset.
+     This causes the busy flags to become 0 shortly after reset/startup.
+   - $2000 bit 3 is now "audio error", becomes valid after "audio busy" -> 0
+     set when an error occurred while preparing playback of the requested audio track
+ * write LED stays on when SRAM content changes constantly
+ * Fixes:
+   - fix empty save files on FAT16 / incorrect free cluster count on FAT32
+   - correct directory sorting (force parent directory at top of list)
+   - fix text corruption when entering a directory with a scrollable name
+   - fix files/dirs count in system information
+   - make 'sd2snes' directory hiding case-insensitive
+   - improve DAC I²S timing
+   - fix occasional palette corruption in menu
+   - fix SD clock glitch on ROM loading (occasional glitches/crashes)
+   - fix memory write timing on ROM loading (occasional glitches/crashes)
+   - fix SPI timing (ROMs not loading; System Information not working)
+   - properly synchronize SNES control signals (occasional glitches/crashes)
+   - fix floating IRQ output (occasional glitches/slowdowns)
+
+
+v0.1.4a (bugfix release)
+========================
+
+ * Fix DMA initialization in the menu (could cause sprite corruption in some games)
+

README.txt

@@ -1,2 +0,0 @@
-The development branch was switched over from 'master' to 'develop'.
-The master stream will be used for releases.

cic/d411-seeds.txt

@@ -0,0 +1,6 @@
+key seed: b14f4b57fd61e98
+          110101111101010
+
+lck seed: _9a185f11e10dec
+          _10101111010100
+

cic/d411.pseudo

@@ -0,0 +1,230 @@
+map:
+
+RAM:0x01~0x0f	Seed 1 (own key seed)?
+RAM:0x10	send/receive buffer?
+RAM:0x11	Stream ID received from LOCK
+RAM:0x12~0x1f	Seed 2 (Stream ID part of lock seed)?
+
+main:
+  goto initstream;
+
+mainloop:
+  a=0x1; 
+mainloop2:
+  x=a;
+  for(x=a; x<16; x++) {
+	main_inner1:
+	  bm=0x0;
+	  call 34b(0x00+x) // prepare next stream bit (send)
+	  bm=0x1;
+	  call 34b(0x10+x) // prepare next stream bit (recv)
+	  call 131 // bm=1; bl=0; a=P0
+	  a=P0;
+	  if(P0.0) die; // WTF? P0.0 is an output!
+	  if(P0.1) die;
+	
+	  a=0x0;
+	  a<->RAM[0x10];   // load A with next output stream bit (nibble)
+	  P0=a;            // LSB -> Key output
+	  nop;             // wait
+	  a=P0;            // read from lock
+	  P0=0;	           // clear output port
+	  RAM[0x10]=a;     // store next input stream bit in RAM
+	  bl=3; a=P3       // P3.0, which is usually UNCONNECTED,
+                           // somehow determines how to deal with
+                           // the input stream. This is SNES CIC specific.
+          // NOTE: For commonly used key operation / pin mapping we must assume
+          // that P3.0 is HIGH (1). (otherwise the key would die immediately)
+	  bl=0
+	  if(P3.0){
+	    if(RAM[0x10].1) { 		       // input stream bit set?
+	      call 159 // bm=0; bl=0; a=P0     // switch "bank"
+	      if(RAM[0x00].0) {                // matches calculated bit?
+	        goto 13d                       // then go on
+	      } else goto 157 // DIE           // else gtfo
+	    } else goto input_stream_bit_clear // input stream bit clear, check
+	  } else goto 175
+	  
+	input_stream_bit_clear:                // input stream bit cleared
+	  call 159 // bm=0; bl=0; a=P0         // switch "bank"
+	  if(RAM[0x00].0) {                    // calculated bit doesn't match?
+	    goto 157 // DIE                    // then die
+	  } else goto 17a // nop; goto 13d     // else go on
+	
+	175:
+	  if(RAM[0x10].0) {                    // this is essentially the same 
+	    call 159 // bm=0; bl=0; a=P0       // as above but 
+	    if(RAM[0x00].1) {                  // input stream bit is set in
+	      goto 13d;                        // RAM[0x10].0 instead of .1 and
+	    } else goto 157 // DIE             // calculated from RAM[0x00].1
+ 	  } else {                             // instead of .0, if P3.0 is 0.
+	    call 159 // bm=0; bl=0; a=P0
+	    if(RAM[0x00].1) {
+	      goto 157 // DIE
+	    } else goto 17a // nop; goto 13d
+	  }
+	
+	13d:                                   // continue
+	  a=x;
+	  a++;                                 // loop to next of 15 stream
+	  if(!overflow) {                      // bits, afterwards:
+	    x=a;
+	    goto main_inner1;
+	  }
+  } // for x=1 to 15
+  (x=0)                                        // 
+  call 04a // set Resets (dummy for key mode)  // output reset levels
+  call 370 // "MANGLE BOTH"                    // calculate new seeds
+  call 370 // "MANGLE BOTH"                    // for both sides
+  call 370 // "MANGLE BOTH"                    // (lock+key) to exchange
+  // this is "SNES security": MANGLE is called THREE TIMES!
+  // as opposed to only once on the NES CICs.
+  a=RAM[0x13];
+  RAM[0x13]=RAM[0x17];
+  // set P3.0 to LSB of RAM[0x13]
+  P3 = (P3 & 0xe) | (RAM[0x13] & 0x1);
+  if(a.0==1) {
+    goto mainloop (seed offset=0x1)
+  } else goto mainloop2 (seed offset=a)
+
+
+04a: // "RUN HOST"
+  call 37a // "skip if lock"
+  a=0x0;
+  P1=a;
+  nop
+  nop
+  nop
+  P1=a;
+return
+
+mangle_both:
+  call mangle(bm=0);
+  goto mangle(bm=1);
+
+mangle:
+  bl=0xf;
+  a=RAM[bm:0xf];
+  x=a;
+  carry=1;
+  bl=0x1;
+  a+=RAM[bm:0x1]+1;
+  RAM[bm:0x1]=a;
+    ==> RAM[bm:0x1]+=RAM[bm:0xf]+1;
+  a=RAM[bm:0x1]; bl++;
+  a+=RAM[bm:0x2]+1;
+  a=~a;
+  RAM[bm:0x2]=a; bl++;
+  a+=RAM[bm:0x3]+1;
+  if(!overflow) {
+    RAM[bm:0x3]=a; bl++;
+  }
+  a+=RAM[bm:0x4];
+  RAM[bm:0x4]=a;
+  a=RAM[bm:0x4]; bl++;
+  carry=0;
+  a+=RAM[bm:0x5]+0;
+  RAM[bm:0x5]=a; bl++;
+  a+=8;
+  a+=RAM[bm:0x6]+0;
+  RAM[bm:0x6]=a; bl++;
+mangle_inner1:
+  a++;
+  nop
+  a+=RAM[bm:0x7..0xf]+0;
+  RAM[bm:0x7..0xf]=a;
+  a=RAM[bm:0x7..0xf]; bl++;
+  if(!overflow) goto mangle_inner1
+  a<->x;
+  a+=0xf;
+  if(!overflow) return;
+  goto mangle
+
+131:
+  bm=0x0;
+  call 37a 
+  (if(!lock)bm=1);
+return;
+
+37a:
+  
+34b: input x='bl'
+  // take a nibble out of the seed (indexed by bm:x)
+  // and set [bm:0], i.e. RAM[0x00] or RAM[0x10] like this:
+  // if(seednibble&1) {
+  //     result=0b0000;
+  // } else {
+  //     if(P3.0) {
+  //         result=0b0101;
+  //     } else {
+  //         result=0b0010;
+  //     }
+  // }
+  bl=x;
+  a=RAM[bm:x];
+  RAM[bm:0] = RAM[bm:x].0 ? 0x7 : 0x0;
+
+  a=P3; // WTF is P3????
+  bl=0;
+  if (P3.0==1) {
+    RAM[bm:0] &= 0b1101;
+  } else {
+    RAM[bm:0] &= 0b1010;
+  }
+return
+
+initstream:
+if(P0.3==0) {
+  if(P0.3==0) {
+    A=RAM[0x11]; RAM[0x11]=0xf
+    input_stream_id_bit;
+    if !(A.1) RAM[0x11]&=0b0111
+    input_stream_id_bit;
+    if !(A.1) RAM[0x11]&=0b1110
+    input_stream_id_bit;
+    if !(A.1) RAM[0x11]&=0b1101
+    input_stream_id_bit;
+    if !(A.1) RAM[0x11]&=0b1011
+    nop
+    
+    RAM[0x01]=0xb;
+    RAM[0x02]=0x1;
+    RAM[0x03]=0x4;
+    RAM[0x04]=0xf;
+    RAM[0x05]=0x4;
+    RAM[0x06]=0xb; // 0x6????
+    RAM[0x07]=0x5;
+    RAM[0x08]=0x7; // 0x8????
+    RAM[0x09]=0xf;
+    RAM[0x0a]=0xd; // 0xa????
+    RAM[0x0b]=0x6;
+    RAM[0x0c]=0x1; // 0xc????
+    RAM[0x0d]=0xe;
+    RAM[0x0e]=0x9;
+    RAM[0x0f]=0x8;
+
+    RAM[0x12]=0x9;
+    RAM[0x13]=0xa;
+    RAM[0x14]=0x1;
+    RAM[0x15]=0x8;
+    RAM[0x16]=0x5;
+    RAM[0x17]=0xf; // 0x7????
+    RAM[0x18]=0x1;
+    RAM[0x19]=0x1; // 0x9????
+    RAM[0x1a]=0xe;
+    RAM[0x1b]=0x1; // 0xb????
+    RAM[0x1c]=0x0;
+    RAM[0x1d]=0xd;
+    RAM[0x1e]=0xe;
+    RAM[0x1f]=0xc;
+
+    mainloop;
+  }
+}
+
+
+
+input_stream_id_bit:
+  wait 6 cycles
+  A=P0
+ret

cic/mangle.c

@@ -0,0 +1,101 @@
+#include <stdio.h>
+
+void printseed(unsigned char* data) {
+	int i;
+	for(i=1;i<16;i++) {
+		printf("%x ", data[i]);
+	}
+	printf("\n");
+}
+
+void printstream(unsigned char* data, int restart) {
+	int i;
+	for(i=restart;i<16;i++) {
+		printf("%d ", data[i]&1);
+	}
+	printf("\n");
+}
+#define CARRY	if(a>0x0f) {\
+			a &= 0xf;\
+			carry=1;\
+		} else carry=0;
+
+void mangle(unsigned char* data) {
+	unsigned char a,x,temp,i,offset,carry=0;
+	a=data[0xf];
+	do {
+		x=a;
+		offset=1;
+		carry=1;
+		a+=data[offset]+carry;
+		data[offset]=a&0xf;
+		a=data[offset++];
+		a+=data[offset]+carry;
+		a=(~a)&0xf;
+		temp=a; a=data[offset]; data[offset++]=temp&0xf;
+		a+=data[offset]+carry;
+		if(a<0x10) {
+			temp=a; a=data[offset]; data[offset++]=temp&0xf;
+		}
+		a+=data[offset];
+		data[offset]=a&0xf;
+		a=data[offset++];
+		carry=0;
+		a+=data[offset]+carry;
+		temp=a; a=data[offset]; data[offset++]=temp&0xf;
+		a+=8;
+		if(a<0x10) {
+			a+=data[offset]+carry;
+		}
+		temp=a; a=data[offset]; data[offset++]=temp&0xf;
+	
+		while(offset<0x10) {
+			a++;
+			a+=data[offset]+carry;
+			data[offset]=a&0xf;
+			a=data[offset++];
+		}
+		offset &= 0xf;
+		a=x;
+		a+=0xf;
+		CARRY;
+	} while(carry);
+}
+
+int main(void) {
+	unsigned char restart=1;
+	unsigned char keyseed[16]= {0x0, // dummy
+			   0xb,0x1,0x4,0xf,
+			   0x4,0xb,0x5,0x7,
+			   0xf,0xd,0x6,0x1,
+			   0xe,0x9,0x8};
+	unsigned char lockseed[16]={0x0, // dummy
+			   0x0,0x9,0xa,0x1,
+			   0x8,0x5,0xf,0x1,
+			   0x1,0xe,0x1,0x0,
+			   0xd,0xe,0xc};
+
+	printseed(keyseed);
+	printseed(lockseed);
+	printf("\n");
+
+while(1) {
+	printf("\n");
+	printstream(keyseed, restart);
+	printstream(lockseed, restart);
+	mangle(keyseed);
+	mangle(keyseed);
+	mangle(keyseed);
+	mangle(lockseed);
+	mangle(lockseed);
+	mangle(lockseed);
+
+//	printseed(keyseed);
+//	printseed(lockseed);
+	restart=lockseed[7];
+//	lockseed[3]=lockseed[7];
+	if(!restart)restart=1;
+//	printf("send %d-15\n", restart);
+}
+	return 0;
+}

cic/scramble.txt

@@ -0,0 +1,70 @@
+start: 
+b14f4b57fd61e98
+4953771997e11b4
+			BL=f
+A=[f]=8
+X=A
+			C=1
+			BL=1
+A+=[1]+1 = 8+b+1 = 4	C=1
+store [1]=4
+A=[1]=4			BL=2
+A+=[2]+1 = 4+1+1 = 6	C=0
+A=~A = 9
+A=[2] = 1
+store [2]=9		BL=3
+A+=[3]+0 = 4+1+0 = 5	C=0; no skip
+A=[3] = 4
+store [3]=5		BL=4
+A+=[4] = 4+f = 3	C=1
+store [4]=3
+A=[4] = 3		BL=5
+			C=0
+A+=[5]+1 = 3+4+0 = 7	C=0
+A=[5] = 4
+store [5]=7		BL=6
+A+=8 = 4+8 = c		C=0
+A+=[6]+0 = b+c+0 = 7	C=1
+A=[6] = b
+store [6]=7		BL=7
+
+A+=1 = b+1 = c		C=0
+A+=[7]+0 = c+5+0 = 1	C=1
+store [7] = 1
+A=[7] = 1		BL=8
+A+=1 = 1+1 = 2		C=0
+A+=[8]+0 = 2+7+0 = 9	C=0
+store [8] = 9
+A=[8] = 9		BL=9
+A+=1 = 9+1 = a		C=0
+A+=[9]+0 = a+f+0 = 9	C=1
+store [9] = 9
+A=[9] = 9		BL=a
+A+=1 = 9+1 = a		C=0
+A+=[a]+0 = a+d+0 = 7	C=1
+store [a] = 7
+A=[a] = 7		BL=b
+A+=1 = 7+1 = 8		C=0
+A+=[b]+0 = 8+6+0 = e	C=0
+store [b] = e
+A=[b] = e		BL=c
+A+=1 = e+1 = f		C=0
+A+=[c]+0 = f+1+0 = 0	C=1
+store [c] = 0
+A=[c] = 0		BL=d
+A+=1 = 0+1 = 1		C=0
+A+=[d]+0 = 1+e+0 = f	C=0
+store [d] = f
+A=[d] = f		BL=e
+A+=1 = f+1 = 0		C=1
+A+=[e]+1 = 0+9+1 = a	C=0
+store [e] = a
+A=[e] = a		BL=f
+A+=1 = a+1 = b		C=0
+A+=[f]+0 = b+8+0 = 3	C=1
+store [f] = 3
+A=[f] = 3		BL=0; skip
+A=X=8
+A+=f = 8+f = 7		C=1; skip
+noooo, all the shit again
+

cic/snescic-key.asm

@@ -0,0 +1,697 @@
+    #include <p12f629.inc>
+processor p12f629
+
+; ---------------------------------------------------------------------
+;   SNES CIC clone for PIC Microcontroller (key mode only)
+;
+;   Copyright (C) 2010 by Maximilian Rehkopf (ikari_01) <otakon@gmx.net>
+;   This software is part of the sd2snes project.
+;
+;   This program is free software; you can redistribute it and/or modify
+;   it under the terms of the GNU General Public License as published by
+;   the Free Software Foundation; version 2 of the License only.
+;
+;   This program is distributed in the hope that it will be useful,
+;   but WITHOUT ANY WARRANTY; without even the implied warranty of
+;   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;   GNU General Public License for more details.
+;
+;   You should have received a copy of the GNU General Public License
+;   along with this program; if not, write to the Free Software
+;   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+;
+; ---------------------------------------------------------------------
+;
+;   pin configuration: (cartridge pin) [key CIC pin]
+;
+;                       ,---_---.
+;      +5V (27,58) [16] |1     8| GND (5,36) [8]
+;      CIC clk (56) [6] |2     7| CIC data i/o 0 (55) [2]
+;            status out |3     6| CIC data i/o 1 (24) [1]
+;                    nc |4     5| CIC slave reset (25) [7]
+;                       `-------'
+;
+;
+;   Status out can be connected to a LED. It indicates:
+;
+;   state                   | output
+;  -------------------------+--------------------
+;   OK (normal operation)   | high
+;   error (unlock failed)   | alternating @~2.5Hz
+;   no CIC (modded SNES)    | low
+;
+;   In case lockout fails, the region is switched automatically and
+;   will be used after the next reset.
+;
+;   memory usage:
+;
+;   0x20		buffer for seed calc and transfer
+;   0x21 - 0x2f		seed area (lock seed)
+;   0x30		buffer for seed calc
+;   0x31 - 0x3f		seed area (key seed; 0x31 filled in by lock)
+;   0x40 - 0x41		buffer for seed calc
+;   0x4d		buffer for eeprom access
+;   0x4e		loop variable for longwait
+;   0x4f		loop variable for wait
+;
+; ---------------------------------------------------------------------
+
+
+; -----------------------------------------------------------------------
+    __CONFIG _EC_OSC & _WDT_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _CPD_OFF
+
+; -----------------------------------------------------------------------
+; code memory
+	org	0x0000
+	nop
+	nop
+	nop
+	goto	init
+isr
+	org	0x0004
+	bcf	INTCON, 1	; clear interrupt cause
+	bcf	GPIO, 0
+	bcf	GPIO, 1
+	bsf	GPIO, 4		; LED on
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	bsf	INTCON, 7	; re-enable interrupts (ISR will continue as main)
+	goto	main
+init
+	org 0x0010
+	banksel GPIO
+	clrf	GPIO
+	movlw	0x07	; GPIO2..0 are digital I/O (not connected to comparator)
+	movwf	CMCON
+	movlw	0x90	; global enable interrupts + enable external interrupt
+	movwf	INTCON
+	banksel	TRISIO
+	movlw	0x2d	; in out in in out in
+	movwf	TRISIO
+	movlw	0x24	; pullups for reset+clk to avoid errors when no CIC in host 
+	movwf	WPU
+	movlw	0x00	; 0x80 for global pullup disable
+	movwf	OPTION_REG
+	
+	banksel GPIO
+	bcf 	GPIO, 4	; LED off
+idle
+	goto	idle	; wait for interrupt from lock
+
+main
+	banksel	TRISIO
+	bsf	TRISIO, 0
+	bcf	TRISIO, 1
+	banksel	GPIO
+; --------INIT LOCK SEED (what the lock sends)--------
+	movlw	0xb
+	movwf	0x21
+	movlw	0x1
+	movwf	0x22
+	movlw	0x4
+	movwf	0x23
+	movlw	0xf
+	movwf	0x24
+	movlw	0x4
+	movwf 	0x25
+	movlw	0xb
+	movwf 	0x26
+	movlw	0x5
+	movwf 	0x27
+	movlw	0x7
+	movwf 	0x28
+	movlw	0xf
+	movwf 	0x29
+	movlw	0xd
+	movwf 	0x2a
+	movlw	0x6
+	movwf 	0x2b
+	movlw	0x1
+	movwf 	0x2c
+	movlw	0xe
+	movwf 	0x2d
+	movlw	0x9
+	movwf 	0x2e
+	movlw	0x8
+	movwf 	0x2f
+	
+; --------INIT KEY SEED (what we must send)--------
+	banksel	EEADR		; D/F411 and D/F413
+	clrf	EEADR		; differ in 2nd seed nibble
+	bsf	EECON1, RD	; of key stream,
+	movf	EEDAT, w	; restore saved nibble from EEPROM
+	banksel GPIO
+	movwf	0x32
+	movlw	0xa
+	movwf	0x33
+	movlw	0x1
+	movwf	0x34
+	movlw	0x8
+	movwf 	0x35
+	movlw	0x5
+	movwf 	0x36
+	movlw	0xf
+	movwf 	0x37
+	movlw	0x1
+	movwf 	0x38
+	movwf 	0x39
+	movlw	0xe
+	movwf 	0x3a
+	movlw	0x1
+	movwf 	0x3b
+	movlw	0x0
+	movwf 	0x3c
+	movlw	0xd
+	movwf 	0x3d
+	movlw	0xe
+	movwf 	0x3e
+	movlw	0xc
+	movwf 	0x3f
+	
+; --------wait for stream ID--------
+	movlw	0xb5
+	call	wait
+	clrf	0x31		; clear lock stream ID
+
+; --------lock sends stream ID. 15 cycles per bit--------
+;	bsf	GPIO, 0		; (debug marker)
+;	bcf	GPIO, 0		; 
+	btfsc	GPIO, 0		; check stream ID bit
+	bsf	0x31, 3		; copy to lock seed
+	movlw	0x2		; wait=3*W+5
+	call	wait		; burn 11 cycles
+	nop
+	nop
+
+;	bsf	GPIO, 0
+;	bcf	GPIO, 0
+	btfsc	GPIO, 0		; check stream ID bit
+	bsf	0x31, 0		; copy to lock seed
+	movlw	0x2		;
+	call	wait		; burn 11 cycles
+	nop
+	nop
+
+;	bsf	GPIO, 0
+;	bcf	GPIO, 0
+	btfsc	GPIO, 0		; check stream ID bit
+	bsf	0x31, 1		; copy to lock seed
+	movlw	0x2		;
+	call	wait		; burn 11 cycles
+	nop
+	nop
+
+;	bsf	GPIO, 0
+;	bcf	GPIO, 0
+	btfsc	GPIO, 0		; check stream ID bit
+	bsf	0x31, 2		; copy to lock seed
+	banksel	TRISIO
+	bcf	TRISIO, 0
+	bsf	TRISIO, 1
+	banksel	GPIO
+	nop
+	movlw	0x27		; "wait" 1
+	call	wait		; wait 121
+	nop
+	nop
+; --------main loop--------
+loop	
+	movlw	0x1
+loop0
+	addlw	0x30	; key stream
+	movwf	FSR	; store in index reg
+loop1
+	movf	INDF, w ; load seed value
+	movwf	0x20
+	bcf	0x20, 1	; clear bit 1 
+	btfsc	0x20, 0 ; copy from bit 0
+	bsf	0x20, 1 ; (if set)
+	bsf	0x20, 4 ; LED on
+	movf	0x20, w
+	movwf	GPIO
+	nop
+	movlw	0x10
+	movwf	GPIO	; reset GPIO
+	movlw	0x16
+	call	wait
+	nop
+	btfsc	GPIO, 0 ; both pins must be low...
+	goto	die
+	btfsc	GPIO, 1 ; ...when no bit transfer takes place
+	goto	die	; if not -> lock cic error state -> die
+	incf	FSR, f	; next one
+	movlw	0xf
+	andwf	FSR, w
+	btfss	STATUS, Z	
+	goto	loop1
+	movlw	0x2	; wait 10
+	call	wait	;
+	nop
+	nop
+	call	mangle
+	call	mangle
+	call	mangle
+	btfsc	0x37, 0
+	goto	swap
+	banksel	TRISIO
+	bcf	TRISIO, 0
+	bsf	TRISIO, 1
+	goto	swapskip
+swap
+	banksel	TRISIO
+	bsf	TRISIO, 0
+	bcf	TRISIO, 1
+	nop
+swapskip
+	banksel GPIO
+	movf	0x37, w
+	andlw	0xf
+	btfss	STATUS, Z
+	goto	loop0
+	goto	loop
+
+; --------calculate new seeds--------
+; had to be unrolled because PIC has an inefficient way of handling
+; indirect access, no post increment, etc.
+mangle
+	call	mangle_lock
+	nop
+	nop
+mangle_key
+	movf	0x2f, w
+	movwf	0x20	
+mangle_key_loop
+	addlw	0x1
+	addwf	0x21, f
+	movf	0x22, w
+	movwf	0x40
+	movf	0x21, w
+	addwf	0x22, f
+	incf	0x22, f
+	comf	0x22, f
+	movf	0x23, w
+	movwf	0x41	; store 23 to 41
+	movlw	0xf
+	andwf	0x23, f
+	movf	0x40, w ; add 40(22 old)+23+#1 and skip if carry
+	andlw	0xf
+	addwf	0x23, f
+	incf	0x23, f
+	btfsc	0x23, 4
+	goto	mangle_key_withskip
+mangle_key_withoutskip
+	movf	0x41, w ; restore 23
+	addwf	0x24, f ; add to 24
+	movf	0x25, w
+	movwf	0x40	; save 25 to 40
+	movf	0x24, w
+	addwf	0x25, f
+	movf	0x26, w
+	movwf	0x41	; save 26 to 41
+	movf	0x40, w ; restore 25
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x26, w
+	movwf	0x26
+
+	movf	0x41, w ; restore 26
+	addlw	0x1	; inc
+	addwf	0x27, f	; add to 27
+
+	movf	0x27, w ;
+	addlw	0x1	; inc
+	addwf	0x28, f ; add to 28
+
+	movf	0x28, w ;
+	addlw	0x1	; inc
+	addwf	0x29, f ; add to 29
+
+	movf	0x29, w ;
+	addlw	0x1	; inc
+	addwf	0x2a, f ; add to 2a
+
+	movf	0x2a, w ;
+	addlw	0x1	; inc
+	addwf	0x2b, f ; add to 2b
+
+	movf	0x2b, w ;
+	addlw	0x1	; inc
+	addwf	0x2c, f ; add to 2c
+
+	movf	0x2c, w ;
+	addlw	0x1	; inc
+	addwf	0x2d, f ; add to 2d
+
+	movf	0x2d, w ;
+	addlw	0x1	; inc
+	addwf	0x2e, f ; add to 2e
+
+	movf	0x2e, w ;
+	addlw	0x1	; inc
+	addwf	0x2f, f ; add to 2f
+
+	movf	0x20, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x20
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x20, 4 ; skip if half-byte carry
+	goto mangle_return ; +2 cycles in return
+	nop
+	goto mangle_key_loop
+; 69 when goto, 69 when return
+; CIC has 78 -> 9 nops
+
+mangle_key_withskip
+	movf	0x41, w ; restore 23
+	addwf	0x23, f ; add to 23
+	movf	0x24, w
+	movwf	0x40	; save 24 to 40
+	movf	0x23, w
+	addwf	0x24, f
+	movf	0x25, w
+	movwf	0x41	; save 25 to 41
+	movf	0x40, w ; restore 24
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x25, w
+	movwf	0x25
+
+	movf	0x41, w ; restore 25
+	addlw	0x1	; inc
+	addwf	0x26, f	; add to 26
+
+	movf	0x26, w ;
+	addlw	0x1	; inc
+	addwf	0x27, f ; add to 27
+
+	movf	0x27, w ;
+	addlw	0x1	; inc
+	addwf	0x28, f ; add to 28
+
+	movf	0x28, w ;
+	addlw	0x1	; inc
+	addwf	0x29, f ; add to 29
+
+	movf	0x29, w ;
+	addlw	0x1	; inc
+	addwf	0x2a, f ; add to 2a
+
+	movf	0x2a, w ;
+	addlw	0x1	; inc
+	addwf	0x2b, f ; add to 2b
+
+	movf	0x2b, w ;
+	addlw	0x1	; inc
+	addwf	0x2c, f ; add to 2c
+
+	movf	0x2c, w ;
+	addlw	0x1	; inc
+	addwf	0x2d, f ; add to 2d
+
+	movf	0x2d, w ;
+	addlw	0x1	; inc
+	addwf	0x2e, f ; add to 2e
+
+	movf	0x2e, w ;
+	addlw	0x1	; inc
+	addwf	0x2f, f ; add to 2f
+
+	movf	0x20, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x20
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x20, 4 ; skip if half-byte carry
+	goto mangle_return ; +2 cycles in return
+	nop
+	goto mangle_key_loop
+mangle_return
+	return
+; 73 when goto, 73 when return
+; CIC has 84 -> 11 nops
+
+mangle_lock
+	movf	0x3f, w
+	movwf	0x30	
+mangle_lock_loop
+	addlw	0x1
+	addwf	0x31, f
+	movf	0x32, w
+	movwf	0x40
+	movf	0x31, w
+	addwf	0x32, f
+	incf	0x32, f
+	comf	0x32, f
+	movf	0x33, w
+	movwf	0x41	; store 33 to 41
+	movlw	0xf
+	andwf	0x33, f
+	movf	0x40, w ; add 40(32 old)+33+#1 and skip if carry
+	andlw	0xf
+	addwf	0x33, f
+	incf	0x33, f
+	btfsc	0x33, 4
+	goto	mangle_lock_withskip
+mangle_lock_withoutskip
+	movf	0x41, w ; restore 33
+	addwf	0x34, f ; add to 34
+	movf	0x35, w
+	movwf	0x40	; save 35 to 40
+	movf	0x34, w
+	addwf	0x35, f
+	movf	0x36, w
+	movwf	0x41	; save 36 to 41
+	movf	0x40, w ; restore 35
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x36, w
+	movwf	0x36
+
+	movf	0x41, w ; restore 36
+	addlw	0x1	; inc
+	addwf	0x37, f	; add to 37
+
+	movf	0x37, w ;
+	addlw	0x1	; inc
+	addwf	0x38, f ; add to 38
+
+	movf	0x38, w ;
+	addlw	0x1	; inc
+	addwf	0x39, f ; add to 39
+
+	movf	0x39, w ;
+	addlw	0x1	; inc
+	addwf	0x3a, f ; add to 3a
+
+	movf	0x3a, w ;
+	addlw	0x1	; inc
+	addwf	0x3b, f ; add to 3b
+
+	movf	0x3b, w ;
+	addlw	0x1	; inc
+	addwf	0x3c, f ; add to 3c
+
+	movf	0x3c, w ;
+	addlw	0x1	; inc
+	addwf	0x3d, f ; add to 3d
+
+	movf	0x3d, w ;
+	addlw	0x1	; inc
+	addwf	0x3e, f ; add to 3e
+
+	movf	0x3e, w ;
+	addlw	0x1	; inc
+	addwf	0x3f, f ; add to 3f
+
+	movf	0x30, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x30
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x30, 4 ; skip if half-byte carry
+	goto mangle_return
+	nop
+	goto mangle_lock_loop
+; 69 when goto, 69 when return
+; CIC has 78 -> 9 nops
+	
+mangle_lock_withskip
+	movf	0x41, w ; restore 33
+	addwf	0x33, f ; add to 33
+	movf	0x34, w
+	movwf	0x40	; save 34 to 40
+	movf	0x33, w
+	addwf	0x34, f
+	movf	0x35, w
+	movwf	0x41	; save 35 to 41
+	movf	0x40, w ; restore 34
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x35, w
+	movwf	0x35
+
+	movf	0x41, w ; restore 35
+	addlw	0x1	; inc
+	addwf	0x36, f	; add to 36
+
+	movf	0x36, w ;
+	addlw	0x1	; inc
+	addwf	0x37, f ; add to 37
+
+	movf	0x37, w ;
+	addlw	0x1	; inc
+	addwf	0x38, f ; add to 38
+
+	movf	0x38, w ;
+	addlw	0x1	; inc
+	addwf	0x39, f ; add to 39
+
+	movf	0x39, w ;
+	addlw	0x1	; inc
+	addwf	0x3a, f ; add to 3a
+
+	movf	0x3a, w ;
+	addlw	0x1	; inc
+	addwf	0x3b, f ; add to 3b
+
+	movf	0x3b, w ;
+	addlw	0x1	; inc
+	addwf	0x3c, f ; add to 3c
+
+	movf	0x3c, w ;
+	addlw	0x1	; inc
+	addwf	0x3d, f ; add to 3d
+
+	movf	0x3d, w ;
+	addlw	0x1	; inc
+	addwf	0x3e, f ; add to 3e
+
+	movf	0x3e, w ;
+	addlw	0x1	; inc
+	addwf	0x3f, f ; add to 3f
+
+	movf	0x30, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x30
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x30, 4 ; skip if half-byte carry
+	goto mangle_return
+	nop
+	goto mangle_lock_loop
+; 73 when goto, 73 when return
+; CIC has 84 -> 11 nops
+
+; --------wait: 3*(W-1)+7 cycles (including call+return). W=0 -> 256!--------
+wait	
+	movwf	0x4f
+wait0	decfsz	0x4f, f
+	goto	wait0
+	return	
+
+; --------wait long: 8+(3*(w-1))+(772*w). W=0 -> 256!--------
+longwait
+	movwf	0x4e
+	clrw
+longwait0
+	call	wait
+	decfsz	0x4e, f
+	goto	longwait0
+	return
+
+; --------change region in eeprom and die--------
+die
+	banksel	EEADR
+	clrw
+	movwf	EEADR
+	bsf	EECON1, RD
+	movf	EEDAT, w
+	banksel	GPIO
+	movwf	0x4d
+	btfsc	0x4d, 0
+	goto	die_reg_6
+die_reg_9
+	movlw	0x9	; died with PAL, fall back to NTSC
+	goto	die_reg_cont
+die_reg_6
+	movlw	0x6	; died with NTSC, fall back to PAL
+die_reg_cont
+	banksel	EEADR
+	movwf	EEDAT
+	bsf	EECON1, WREN
+
+die_intloop
+	bcf	INTCON, GIE
+	btfsc	INTCON, GIE
+	goto	die_intloop
+	
+	movlw	0x55
+	movwf	EECON2
+	movlw	0xaa
+	movwf	EECON2
+	bsf	EECON1, WR
+	bsf	INTCON, GIE
+
+	banksel	GPIO
+; --------forever: blink status pin--------
+die_blink	
+	clrw
+	call	longwait
+	bcf	GPIO, 4
+	call	longwait
+	bsf	GPIO, 4
+	goto	die_blink
+; -----------------------------------------------------------------------
+; eeprom memory
+DEEPROM	CODE
+	de      0x09	; D411 (NTSC)
+end

cic/snescic-lock-resync.asm

@@ -0,0 +1,741 @@
+    #include <p12f629.inc>
+processor p12f629
+
+; ---------------------------------------------------------------------
+;   SNES CIC clone for PIC Microcontroller (lock mode, auto key region detect,
+;   error tolerant)
+;
+;   Copyright (C) 2010 by Maximilian Rehkopf (ikari_01) <otakon@gmx.net>
+;   This software is part of the sd2snes project.
+;
+;   This program is free software; you can redistribute it and/or modify
+;   it under the terms of the GNU General Public License as published by
+;   the Free Software Foundation; version 2 of the License only.
+;
+;   This program is distributed in the hope that it will be useful,
+;   but WITHOUT ANY WARRANTY; without even the implied warranty of
+;   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;   GNU General Public License for more details.
+;
+;   You should have received a copy of the GNU General Public License
+;   along with this program; if not, write to the Free Software
+;   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+;
+; ---------------------------------------------------------------------
+;
+;   pin configuration: (cartridge slot pin) [original 18-pin SMD lock CIC pin]
+;
+;                       ,---_---.
+;      +5V (27,58) [18] |1     8| GND (5,36) [9]
+;      CIC clk (56) [7] |2     7| CIC data i/o 0 (55) [1]
+;   host reset out [10] |3     6| CIC data i/o 1 (24) [2]
+; CIC lock reset in [8] |4     5| CIC slave reset out (25) [11]
+;                       `-------'
+;
+;   pin 3 connected to PPU2 reset in
+;   pin 4 connected to reset button
+;   pin 5 connected to key CIC pin 7 (or clone CIC pin 5)
+;   pin 6 connected to key CIC pin 1 (or clone CIC pin 6)
+;   pin 7 connected to key CIC pin 2 (or clone CIC pin 7)
+;
+;   Host reset out behaves as follows:
+;   After powerup it is held low for a couple of us to properly allow the
+;   components to power-up.
+;   It is then asserted a high level even if the CIC "auth" should fail at
+;   any point, thus enabling homebrew or other cartridges without a CIC or
+;   CIC clone to be run properly while maintaining compatibility with CIC
+;   demanding cartridges like S-DD1 or SA-1 powered ones.
+;   The type of key CIC (411/413) is detected automatically.
+;
+;   memory usage:
+;
+;   0x20		buffer for seed calc and transfer
+;   0x21 - 0x2f		seed area (lock seed)
+;   0x30		buffer for seed calc
+;   0x31 - 0x3f		seed area (key seed; 0x31 filled in by lock)
+;   0x40 - 0x41		buffer for seed calc
+;   0x42		input buffer
+;   0x43		variable for key detect
+;   0x4d		buffer for eeprom access
+;   0x4e		loop variable for longwait
+;   0x4f		loop variable for wait
+;
+; ---------------------------------------------------------------------
+
+
+; -----------------------------------------------------------------------
+   __CONFIG _EC_OSC & _WDT_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _CPD_OFF
+
+; -----------------------------------------------------------------------
+; code memory
+	org	0x0000
+	nop
+	nop
+	nop
+	goto	init
+rst				; we jump here after powerup or GPIO3=1
+	org	0x0004
+	bcf	GPIO, 0		; clear stream i/o
+	bcf	GPIO, 1		; clear stream i/o
+	bcf	GPIO, 2		; disable slave reset
+	bcf	GPIO, 4		; hold the SNES in reset
+rst_loop
+	btfsc	GPIO, 3		; stay in "reset" as long as GPIO3=1
+	goto	rst_loop
+	nop
+	nop
+	nop
+	nop
+	nop
+	goto	main
+init
+	org 0x0010
+	banksel GPIO
+	clrf	GPIO
+	movlw	0x07	; GPIO2..0 are digital I/O (not connected to comparator)
+	movwf	CMCON
+	movlw	0x00	; disable all interrupts
+	movwf	INTCON
+	banksel	TRISIO
+	movlw	0x29	; in out in OUT out in. slave reset is an output on lock
+	movwf	TRISIO
+	movlw	0x00	; no pullups
+	movwf	WPU
+	movlw	0x80	; global pullup disable
+	movwf	OPTION_REG
+	
+	banksel GPIO
+	bcf 	GPIO, 4	; LED off
+	goto	rst
+main
+	movlw	0x40	; wait a bit before initializing the slave + console
+	call	longwait
+
+	bsf	GPIO, 4 ; enable console
+	
+	bsf	GPIO, 2 ; trigger the slave
+	clrf	0x44	; clear direction
+	nop
+	bcf	GPIO, 2 	
+
+	banksel	TRISIO
+	bcf	TRISIO, 0
+	bsf	TRISIO, 1
+	banksel	GPIO
+; --------INIT LOCK SEED (what we must send)--------
+	movlw	0xb
+	movwf	0x21
+	movlw	0x1
+	movwf	0x22
+	movlw	0x4
+	movwf	0x23
+	movlw	0xf
+	movwf	0x24
+	movlw	0x4
+	movwf 	0x25
+	movlw	0xb
+	movwf 	0x26
+	movlw	0x5
+	movwf 	0x27
+	movlw	0x7
+	movwf 	0x28
+	movlw	0xf
+	movwf 	0x29
+	movlw	0xd
+	movwf 	0x2a
+	movlw	0x6
+	movwf 	0x2b
+	movlw	0x1
+	movwf 	0x2c
+	movlw	0xe
+	movwf 	0x2d
+	movlw	0x9
+	movwf 	0x2e
+	movlw	0x8
+	movwf 	0x2f
+	
+; --------INIT KEY SEED (what the key sends)--------
+	movlw	0xf	; we always request the same stream for simplicity
+	movwf	0x31
+	movlw	0x0	; this is filled in by key autodetect
+	movwf	0x32
+	movlw	0xa
+	movwf	0x33
+	movlw	0x1
+	movwf	0x34
+	movlw	0x8
+	movwf 	0x35
+	movlw	0x5
+	movwf 	0x36
+	movlw	0xf
+	movwf 	0x37
+	movlw	0x1
+	movwf 	0x38
+	movwf 	0x39
+	movlw	0xe
+	movwf 	0x3a
+	movlw	0x1
+	movwf 	0x3b
+	movlw	0x0
+	movwf 	0x3c
+	movlw	0xd
+	movwf 	0x3d
+	movlw	0xe
+	movwf 	0x3e
+	movlw	0xc
+	movwf 	0x3f
+	
+; --------wait before sending stream ID--------
+	movlw	0xba
+	call	wait
+	nop
+	nop
+
+; --------lock sends stream ID. 15 cycles per bit--------
+;	bsf	GPIO, 0		; (debug marker)
+;	bcf	GPIO, 0		; 
+	btfsc	0x31, 3		; read stream select bit
+	bsf	GPIO, 0		; send bit
+	nop
+	nop
+	bcf	GPIO, 0
+	movlw	0x1		; wait=7
+	call	wait		; burn 10 cycles
+	nop
+	nop
+
+;	bsf	GPIO, 0
+;	bcf	GPIO, 0
+	btfsc	0x31, 0		; read stream select bit
+	bsf	GPIO, 0		; send bit
+	nop
+	nop
+	bcf	GPIO, 0
+	movlw	0x1		; wait=3*W+5
+	call	wait		; burn 11 cycles
+	nop
+	nop
+
+;	bsf	GPIO, 0
+;	bcf	GPIO, 0
+	btfsc	0x31, 1		; read stream select bit
+	bsf	GPIO, 0		; send bit
+	nop
+	nop
+	bcf	GPIO, 0
+	movlw	0x1		; wait=3*W+5
+	call	wait		; burn 11 cycles
+	nop
+	nop
+
+;	bsf	GPIO, 0
+;	bcf	GPIO, 0
+	btfsc	0x31, 2		; read stream select bit
+	bsf	GPIO, 0		; send bit
+	nop
+	nop
+	bcf	GPIO, 0
+	movlw	0x1		; wait=3*0+7
+	call	wait		; burn 10 cycles
+	banksel	TRISIO
+	bsf	TRISIO, 0
+	bcf	TRISIO, 1
+	banksel	GPIO
+	movlw	0x24		; "wait" 1
+	call	wait		; wait 112
+;	nop
+	movlw	0x1		; 'first time' bit
+	movwf	0x43		; for key detection
+; --------main loop--------
+loop	
+	movlw	0x1
+loop0
+	addlw	0x20	; lock stream
+	movwf	FSR	; store in index reg
+loop1
+	movf	INDF, w ; load seed value
+	movwf	0x20
+	bcf	0x20, 1	; clear bit 1 
+	btfsc	0x20, 0 ; copy from bit 0
+	bsf	0x20, 1 ; (if set)
+	bsf	0x20, 4 ; run console
+	bcf	0x20, 2 ; run slave
+	movf	0x20, w
+	movwf	GPIO
+	movf	GPIO, w ; read input
+	movwf	0x42	; store input
+	movlw	0x10
+	movwf	GPIO	; reset GPIO
+	call	checkkey	
+
+	btfsc	GPIO, 3 ; poll master reset
+	goto	rst	; (to allow resetting w/o key CIC...)
+
+	btfsc	0x44, 0	; check "direction"
+	rrf	0x42, f	; shift received bit into place
+	bsf	FSR, 4	; goto other stream
+	movf	INDF, w	; read
+	xorwf	0x42, f	; xor received + calculated
+	bcf	FSR, 4	; back to our own stream
+	btfsc	0x42, 0	; equal? then continue
+	goto 	main	; else resync key and start over
+
+	nop		; wait 1 cycle
+	nop		; wait 1 cycle
+	movlw	0xc	; wait 40 cycles
+	call	wait
+	btfsc	GPIO, 0 ; both pins must be low...
+	goto	die
+	btfsc	GPIO, 1 ; ...when no bit transfer takes place
+	goto	die	; if not -> lock cic error state -> die
+	incf	FSR, f	; next one
+	movlw	0xf
+	andwf	FSR, w
+	btfss	STATUS, Z	
+	goto	loop1
+	movlw	0x1	; wait 7
+	call	wait	;
+	call	mangle
+	call	mangle
+	call	mangle
+	movf	0x37, w
+	movwf	0x44
+	btfsc	0x37, 0
+	goto	swap
+	banksel	TRISIO
+	bsf	TRISIO, 0
+	bcf	TRISIO, 1
+	goto	swapskip
+swap
+	banksel	TRISIO
+	bcf	TRISIO, 0
+	bsf	TRISIO, 1
+	nop
+swapskip
+	banksel GPIO
+	btfsc	GPIO, 3 ; poll master reset
+	goto	rst
+	clrf	0x43	; don't check key region anymore
+	movf	0x37, w
+	andlw	0xf
+	btfss	STATUS, Z
+	goto	loop0
+	goto	loop
+
+; --------calculate new seeds--------
+; had to be unrolled because PIC has an inefficient way of handling
+; indirect access, no post increment, no swap, etc.
+mangle
+	call	mangle_lock
+	nop
+	nop
+mangle_key
+	movf	0x2f, w
+	movwf	0x20	
+mangle_key_loop
+	addlw	0x1
+	addwf	0x21, f
+	movf	0x22, w
+	movwf	0x40
+	movf	0x21, w
+	addwf	0x22, f
+	incf	0x22, f
+	comf	0x22, f
+	movf	0x23, w
+	movwf	0x41	; store 23 to 41
+	movlw	0xf
+	andwf	0x23, f
+	movf	0x40, w ; add 40(22 old)+23+#1 and skip if carry
+	andlw	0xf
+	addwf	0x23, f
+	incf	0x23, f
+	btfsc	0x23, 4
+	goto	mangle_key_withskip
+mangle_key_withoutskip
+	movf	0x41, w ; restore 23
+	addwf	0x24, f ; add to 24
+	movf	0x25, w
+	movwf	0x40	; save 25 to 40
+	movf	0x24, w
+	addwf	0x25, f
+	movf	0x26, w
+	movwf	0x41	; save 26 to 41
+	movf	0x40, w ; restore 25
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x26, w
+	movwf	0x26
+
+	movf	0x41, w ; restore 26
+	addlw	0x1	; inc
+	addwf	0x27, f	; add to 27
+
+	movf	0x27, w ;
+	addlw	0x1	; inc
+	addwf	0x28, f ; add to 28
+
+	movf	0x28, w ;
+	addlw	0x1	; inc
+	addwf	0x29, f ; add to 29
+
+	movf	0x29, w ;
+	addlw	0x1	; inc
+	addwf	0x2a, f ; add to 2a
+
+	movf	0x2a, w ;
+	addlw	0x1	; inc
+	addwf	0x2b, f ; add to 2b
+
+	movf	0x2b, w ;
+	addlw	0x1	; inc
+	addwf	0x2c, f ; add to 2c
+
+	movf	0x2c, w ;
+	addlw	0x1	; inc
+	addwf	0x2d, f ; add to 2d
+
+	movf	0x2d, w ;
+	addlw	0x1	; inc
+	addwf	0x2e, f ; add to 2e
+
+	movf	0x2e, w ;
+	addlw	0x1	; inc
+	addwf	0x2f, f ; add to 2f
+
+	movf	0x20, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x20
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x20, 4 ; skip if half-byte carry
+	goto mangle_return ; +2 cycles in return
+	nop
+	goto mangle_key_loop
+; 69 when goto, 69 when return
+; CIC has 78 -> 9 nops
+
+mangle_key_withskip
+	movf	0x41, w ; restore 23
+	addwf	0x23, f ; add to 23
+	movf	0x24, w
+	movwf	0x40	; save 24 to 40
+	movf	0x23, w
+	addwf	0x24, f
+	movf	0x25, w
+	movwf	0x41	; save 25 to 41
+	movf	0x40, w ; restore 24
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x25, w
+	movwf	0x25
+
+	movf	0x41, w ; restore 25
+	addlw	0x1	; inc
+	addwf	0x26, f	; add to 26
+
+	movf	0x26, w ;
+	addlw	0x1	; inc
+	addwf	0x27, f ; add to 27
+
+	movf	0x27, w ;
+	addlw	0x1	; inc
+	addwf	0x28, f ; add to 28
+
+	movf	0x28, w ;
+	addlw	0x1	; inc
+	addwf	0x29, f ; add to 29
+
+	movf	0x29, w ;
+	addlw	0x1	; inc
+	addwf	0x2a, f ; add to 2a
+
+	movf	0x2a, w ;
+	addlw	0x1	; inc
+	addwf	0x2b, f ; add to 2b
+
+	movf	0x2b, w ;
+	addlw	0x1	; inc
+	addwf	0x2c, f ; add to 2c
+
+	movf	0x2c, w ;
+	addlw	0x1	; inc
+	addwf	0x2d, f ; add to 2d
+
+	movf	0x2d, w ;
+	addlw	0x1	; inc
+	addwf	0x2e, f ; add to 2e
+
+	movf	0x2e, w ;
+	addlw	0x1	; inc
+	addwf	0x2f, f ; add to 2f
+
+	movf	0x20, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x20
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x20, 4 ; skip if half-byte carry
+	goto mangle_return ; +2 cycles in return
+	nop
+	goto mangle_key_loop
+mangle_return
+	return
+; 73 when goto, 73 when return
+; CIC has 84 -> 11 nops
+
+mangle_lock
+	movf	0x3f, w
+	movwf	0x30	
+mangle_lock_loop
+	addlw	0x1
+	addwf	0x31, f
+	movf	0x32, w
+	movwf	0x40
+	movf	0x31, w
+	addwf	0x32, f
+	incf	0x32, f
+	comf	0x32, f
+	movf	0x33, w
+	movwf	0x41	; store 33 to 41
+	movlw	0xf
+	andwf	0x33, f
+	movf	0x40, w ; add 40(32 old)+33+#1 and skip if carry
+	andlw	0xf
+	addwf	0x33, f
+	incf	0x33, f
+	btfsc	0x33, 4
+	goto	mangle_lock_withskip
+mangle_lock_withoutskip
+	movf	0x41, w ; restore 33
+	addwf	0x34, f ; add to 34
+	movf	0x35, w
+	movwf	0x40	; save 35 to 40
+	movf	0x34, w
+	addwf	0x35, f
+	movf	0x36, w
+	movwf	0x41	; save 36 to 41
+	movf	0x40, w ; restore 35
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x36, w
+	movwf	0x36
+
+	movf	0x41, w ; restore 36
+	addlw	0x1	; inc
+	addwf	0x37, f	; add to 37
+
+	movf	0x37, w ;
+	addlw	0x1	; inc
+	addwf	0x38, f ; add to 38
+
+	movf	0x38, w ;
+	addlw	0x1	; inc
+	addwf	0x39, f ; add to 39
+
+	movf	0x39, w ;
+	addlw	0x1	; inc
+	addwf	0x3a, f ; add to 3a
+
+	movf	0x3a, w ;
+	addlw	0x1	; inc
+	addwf	0x3b, f ; add to 3b
+
+	movf	0x3b, w ;
+	addlw	0x1	; inc
+	addwf	0x3c, f ; add to 3c
+
+	movf	0x3c, w ;
+	addlw	0x1	; inc
+	addwf	0x3d, f ; add to 3d
+
+	movf	0x3d, w ;
+	addlw	0x1	; inc
+	addwf	0x3e, f ; add to 3e
+
+	movf	0x3e, w ;
+	addlw	0x1	; inc
+	addwf	0x3f, f ; add to 3f
+
+	movf	0x30, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x30
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x30, 4 ; skip if half-byte carry
+	goto mangle_return
+	nop
+	goto mangle_lock_loop
+; 69 when goto, 69 when return
+; CIC has 78 -> 9 nops
+	
+mangle_lock_withskip
+	movf	0x41, w ; restore 33
+	addwf	0x33, f ; add to 33
+	movf	0x34, w
+	movwf	0x40	; save 34 to 40
+	movf	0x33, w
+	addwf	0x34, f
+	movf	0x35, w
+	movwf	0x41	; save 35 to 41
+	movf	0x40, w ; restore 34
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x35, w
+	movwf	0x35
+
+	movf	0x41, w ; restore 35
+	addlw	0x1	; inc
+	addwf	0x36, f	; add to 36
+
+	movf	0x36, w ;
+	addlw	0x1	; inc
+	addwf	0x37, f ; add to 37
+
+	movf	0x37, w ;
+	addlw	0x1	; inc
+	addwf	0x38, f ; add to 38
+
+	movf	0x38, w ;
+	addlw	0x1	; inc
+	addwf	0x39, f ; add to 39
+
+	movf	0x39, w ;
+	addlw	0x1	; inc
+	addwf	0x3a, f ; add to 3a
+
+	movf	0x3a, w ;
+	addlw	0x1	; inc
+	addwf	0x3b, f ; add to 3b
+
+	movf	0x3b, w ;
+	addlw	0x1	; inc
+	addwf	0x3c, f ; add to 3c
+
+	movf	0x3c, w ;
+	addlw	0x1	; inc
+	addwf	0x3d, f ; add to 3d
+
+	movf	0x3d, w ;
+	addlw	0x1	; inc
+	addwf	0x3e, f ; add to 3e
+
+	movf	0x3e, w ;
+	addlw	0x1	; inc
+	addwf	0x3f, f ; add to 3f
+
+	movf	0x30, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x30
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x30, 4 ; skip if half-byte carry
+	goto mangle_return
+	nop
+	goto mangle_lock_loop
+; 73 when goto, 73 when return
+; CIC has 84 -> 11 nops
+
+; --------wait: 3*(W-1)+7 cycles (including call+return). W=0 -> 256!--------
+wait	
+	movwf	0x4f
+wait0	decfsz	0x4f, f
+	goto	wait0
+	return	
+
+; --------wait long: 8+(3*(w-1))+(772*w). W=0 -> 256!--------
+longwait
+	movwf	0x4e
+	clrw
+longwait0
+	call	wait
+	decfsz	0x4e, f
+	goto	longwait0
+	return
+
+; --------die (do nothing, wait for reset)--------
+die
+	btfsc	GPIO, 3
+	goto	rst
+	goto	die
+
+; --------check the key input and change "region" when appropriate--------
+; --------requires 17 cycles (incl. call+return)
+checkkey
+	btfss	0x43, 0			; first time?
+	goto 	checkkey_nocheck	; if not, just burn some cycles
+	movlw	0x22			; are we at the correct stream offset?
+	xorwf	FSR, w
+	btfss	STATUS, Z		; if not equal:
+	goto	checkkey_nocheck2	; burn some cycles less.
+					; if equal do the check
+	btfss	0x42, 0			; if value from slave is set it's a 411
+	goto	check_413
+check_411
+	nop				; to compensate for untaken branch
+	movlw	0x9
+	goto	check_save
+check_413
+	movlw	0x6
+	goto	check_save
+
+checkkey_nocheck
+	nop
+	nop
+	nop
+	nop
+checkkey_nocheck2
+	nop
+	nop
+	nop
+	nop
+	goto check_done
+check_save
+	movwf	0x32
+check_done
+	return
+end
+; ------------------------------------------------------------------------

cic/snescic-lock-resync.hex

@@ -0,0 +1,71 @@
+:020000040000FA
+:1000000000000000000010280510851005110512E1
+:1000100085190828000000000000000000002028CA
+:10002000831285010730990000308B008316293038
+:10003000850000309500803081008312051204286D
+:100040004030FC2105160515C4010000051183167A
+:100050000510851483120B30A1000130A20004307A
+:10006000A3000F30A4000430A5000B30A60005301B
+:10007000A7000730A8000F30A9000D30AA000630F5
+:10008000AB000130AC000E30AD000930AE000830DE
+:10009000AF000F30B1000030B2000A30B3000130C1
+:1000A000B4000830B5000530B6000F30B70001309D
+:1000B000B800B9000E30BA000130BB000030BC00FF
+:1000C0000D30BD000E30BE000C30BF00BA30F8213C
+:1000D00000000000B11905140000000005100130F7
+:1000E000F821000000003118051400000000051080
+:1000F0000130F82100000000B118051400000000D4
+:1001000005100130F821000000003119051400002D
+:10011000000005100130F8218316051485108312A4
+:100120002430F8210130C3000130203E8400000853
+:10013000A000A0102018A01420162011200885006F
+:100140000508C200103085000522851904284418CE
+:10015000C20C04160008C20604124218202800002F
+:1001600000000C30F8210518022A8518022A840A9A
+:100170000F300405031D97280130F821D620D62022
+:10018000D6203708C4003718C928831605148510EF
+:10019000CD288316051085140000831285190428C4
+:1001A000C30137080F39031D9528942869210000E1
+:1001B00000002F08A000013EA1072208C00021086E
+:1001C000A207A20AA2092308C1000F30A305400814
+:1001D0000F39A307A30A231A28294108A4072508D1
+:1001E000C0002408A5072608C10040080F39083EB2
+:1001F000C000401E2607A6004108013EA7072708A9
+:10020000013EA8072808013EA9072908013EAA07C0
+:100210002A08013EAB072B08013EAC072C08013E23
+:10022000AD072D08013EAE072E08013EAF0720089E
+:100230000F390F3EA0000000000000000000000089
+:100240000000000000000000201E68290000DB28DC
+:100250004108A3072408C0002308A4072508C100FB
+:1002600040080F39083EC000401E2507A500410880
+:10027000013EA6072608013EA7072708013EA8075A
+:100280002808013EA9072908013EAA072A08013EBD
+:10029000AB072B08013EAC072C08013EAD072D082B
+:1002A000013EAE072E08013EAF0720080F390F3E72
+:1002B000A00000000000000000000000000000009E
+:1002C0000000000000000000201E68290000DB285C
+:1002D00008003F08B000013EB1073208C0003108F5
+:1002E000B207B20AB2093308C1000F30B3054008A3
+:1002F0000F39B307B30A331AB8294108B4073508D0
+:10030000C0003408B5073608C10040080F39083E60
+:10031000C000401E3607B6004108013EB707370847
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+:100330003A08013EBB073B08013EBC073C08013EB2
+:10034000BD073D08013EBE073E08013EBF0730081D
+:100350000F390F3EB0000000000000000000000058
+:100360000000000000000000301E682900006B291A
+:100370004108B3073408C0003308B4073508C1008A
+:1003800040080F39083EC000401E3507B50041083F
+:10039000013EB6073608013EB7073708013EB807E9
+:1003A0003808013EB9073908013EBA073A08013E4C
+:1003B000BB073B08013EBC073C08013EBD073D08AA
+:1003C000013EBE073E08013EBF0730080F390F3E11
+:1003D000B00000000000000000000000000000006D
+:1003E0000000000000000000301E682900006B299A
+:1003F000CF00CF0BF9290800CE000301F821CE0B66
+:10040000FE29080085190428022A431C122A2230DA
+:100410000406031D162A421C102A000009301B2A5C
+:1004200006301B2A00000000000000000000000051
+:0A043000000000001C2AB2000800C2
+:02400E00D33F9E
+:00000001FF

cic/snescic-lock.asm

@@ -0,0 +1,726 @@
+    #include <p12f629.inc>
+processor p12f629
+
+; ---------------------------------------------------------------------
+;   SNES CIC clone for PIC Microcontroller (lock mode, auto key region detect,
+;   error tolerant)
+;
+;   Copyright (C) 2010 by Maximilian Rehkopf (ikari_01) <otakon@gmx.net>
+;   This software is part of the sd2snes project.
+;
+;   This program is free software; you can redistribute it and/or modify
+;   it under the terms of the GNU General Public License as published by
+;   the Free Software Foundation; version 2 of the License only.
+;
+;   This program is distributed in the hope that it will be useful,
+;   but WITHOUT ANY WARRANTY; without even the implied warranty of
+;   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;   GNU General Public License for more details.
+;
+;   You should have received a copy of the GNU General Public License
+;   along with this program; if not, write to the Free Software
+;   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+;
+; ---------------------------------------------------------------------
+;
+;   pin configuration: (cartridge slot pin) [original 18-pin SMD lock CIC pin]
+;
+;                       ,---_---.
+;      +5V (27,58) [18] |1     8| GND (5,36) [9]
+;      CIC clk (56) [7] |2     7| CIC data i/o 0 (55) [1]
+;   host reset out [10] |3     6| CIC data i/o 1 (24) [2]
+; CIC lock reset in [8] |4     5| CIC slave reset out (25) [11]
+;                       `-------'
+;
+;   pin 3 connected to PPU2 reset in
+;   pin 4 connected to reset button
+;   pin 5 connected to key CIC pin 7 (or clone CIC pin 5)
+;   pin 6 connected to key CIC pin 1 (or clone CIC pin 6)
+;   pin 7 connected to key CIC pin 2 (or clone CIC pin 7)
+;
+;   Host reset out behaves as follows:
+;   After powerup it is held low for a couple of us to properly allow the
+;   components to power-up.
+;   It is then asserted a high level even if the CIC "auth" should fail at
+;   any point, thus enabling homebrew or other cartridges without a CIC or
+;   CIC clone to be run properly while maintaining compatibility with CIC
+;   demanding cartridges like S-DD1 or SA-1 powered ones.
+;   The type of key CIC (411/413) is detected automatically.
+;
+;   memory usage:
+;
+;   0x20		buffer for seed calc and transfer
+;   0x21 - 0x2f		seed area (lock seed)
+;   0x30		buffer for seed calc
+;   0x31 - 0x3f		seed area (key seed; 0x31 filled in by lock)
+;   0x40 - 0x41		buffer for seed calc
+;   0x42		input buffer
+;   0x43		variable for key detect
+;   0x4d		buffer for eeprom access
+;   0x4e		loop variable for longwait
+;   0x4f		loop variable for wait
+;
+; ---------------------------------------------------------------------
+
+
+; -----------------------------------------------------------------------
+    __CONFIG _EC_OSC & _WDT_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _CPD_OFF
+
+; -----------------------------------------------------------------------
+; code memory
+	org	0x0000
+	nop
+	nop
+	nop
+	goto	init
+rst				; we jump here after powerup or GPIO3=1
+	org	0x0004
+	bcf	GPIO, 0		; clear stream i/o
+	bcf	GPIO, 1		; clear stream i/o
+	bcf	GPIO, 2		; disable slave reset
+	bcf	GPIO, 4		; hold the SNES in reset
+rst_loop
+	btfsc	GPIO, 3		; stay in "reset" as long as GPIO3=1
+	goto	rst_loop
+	nop
+	nop
+	nop
+	nop
+	nop
+	goto	main
+init
+	org 0x0010
+	banksel GPIO
+	clrf	GPIO
+	movlw	0x07	; GPIO2..0 are digital I/O (not connected to comparator)
+	movwf	CMCON
+	movlw	0x00	; disable all interrupts
+	movwf	INTCON
+	banksel	TRISIO
+	movlw	0x29	; in out in OUT out in. slave reset is an output on lock
+	movwf	TRISIO
+	movlw	0x00	; no pullups
+	movwf	WPU
+	movlw	0x80	; global pullup disable
+	movwf	OPTION_REG
+	
+	banksel GPIO
+	bcf 	GPIO, 4	; LED off
+	goto	rst
+main
+	movlw	0x40	; wait a bit before initializing the slave + console
+	call	longwait
+
+	bsf	GPIO, 4 ; enable console
+	
+	bsf	GPIO, 2 ; trigger the slave
+	nop
+	nop
+	bcf	GPIO, 2 	
+
+	banksel	TRISIO
+	bcf	TRISIO, 0
+	bsf	TRISIO, 1
+	banksel	GPIO
+; --------INIT LOCK SEED (what we must send)--------
+	movlw	0xb
+	movwf	0x21
+	movlw	0x1
+	movwf	0x22
+	movlw	0x4
+	movwf	0x23
+	movlw	0xf
+	movwf	0x24
+	movlw	0x4
+	movwf 	0x25
+	movlw	0xb
+	movwf 	0x26
+	movlw	0x5
+	movwf 	0x27
+	movlw	0x7
+	movwf 	0x28
+	movlw	0xf
+	movwf 	0x29
+	movlw	0xd
+	movwf 	0x2a
+	movlw	0x6
+	movwf 	0x2b
+	movlw	0x1
+	movwf 	0x2c
+	movlw	0xe
+	movwf 	0x2d
+	movlw	0x9
+	movwf 	0x2e
+	movlw	0x8
+	movwf 	0x2f
+	
+; --------INIT KEY SEED (what the key sends)--------
+	movlw	0xf	; we always request the same stream for simplicity
+	movwf	0x31
+	movlw	0x0	; this is filled in by key autodetect
+	movwf	0x32
+	movlw	0xa
+	movwf	0x33
+	movlw	0x1
+	movwf	0x34
+	movlw	0x8
+	movwf 	0x35
+	movlw	0x5
+	movwf 	0x36
+	movlw	0xf
+	movwf 	0x37
+	movlw	0x1
+	movwf 	0x38
+	movwf 	0x39
+	movlw	0xe
+	movwf 	0x3a
+	movlw	0x1
+	movwf 	0x3b
+	movlw	0x0
+	movwf 	0x3c
+	movlw	0xd
+	movwf 	0x3d
+	movlw	0xe
+	movwf 	0x3e
+	movlw	0xc
+	movwf 	0x3f
+	
+; --------wait before sending stream ID--------
+	movlw	0xba
+	call	wait
+	nop
+	nop
+
+; --------lock sends stream ID. 15 cycles per bit--------
+;	bsf	GPIO, 0		; (debug marker)
+;	bcf	GPIO, 0		; 
+	btfsc	0x31, 3		; read stream select bit
+	bsf	GPIO, 0		; send bit
+	nop
+	nop
+	bcf	GPIO, 0
+	movlw	0x1		; wait=7
+	call	wait		; burn 10 cycles
+	nop
+	nop
+
+;	bsf	GPIO, 0
+;	bcf	GPIO, 0
+	btfsc	0x31, 0		; read stream select bit
+	bsf	GPIO, 0		; send bit
+	nop
+	nop
+	bcf	GPIO, 0
+	movlw	0x1		; wait=3*W+5
+	call	wait		; burn 11 cycles
+	nop
+	nop
+
+;	bsf	GPIO, 0
+;	bcf	GPIO, 0
+	btfsc	0x31, 1		; read stream select bit
+	bsf	GPIO, 0		; send bit
+	nop
+	nop
+	bcf	GPIO, 0
+	movlw	0x1		; wait=3*W+5
+	call	wait		; burn 11 cycles
+	nop
+	nop
+
+;	bsf	GPIO, 0
+;	bcf	GPIO, 0
+	btfsc	0x31, 2		; read stream select bit
+	bsf	GPIO, 0		; send bit
+	nop
+	nop
+	bcf	GPIO, 0
+	movlw	0x1		; wait=3*0+7
+	call	wait		; burn 10 cycles
+	banksel	TRISIO
+	bsf	TRISIO, 0
+	bcf	TRISIO, 1
+	banksel	GPIO
+	movlw	0x24		; "wait" 1
+	call	wait		; wait 112
+;	nop
+	movlw	0x1		; 'first time' bit
+	movwf	0x43		; for key detection
+; --------main loop--------
+loop	
+	movlw	0x1
+loop0
+	addlw	0x20	; lock stream
+	movwf	FSR	; store in index reg
+loop1
+	movf	INDF, w ; load seed value
+	movwf	0x20
+	bcf	0x20, 1	; clear bit 1 
+	btfsc	0x20, 0 ; copy from bit 0
+	bsf	0x20, 1 ; (if set)
+	bsf	0x20, 4 ; run console
+	bcf	0x20, 2 ; run slave
+	movf	0x20, w
+	movwf	GPIO
+	movf	GPIO, w ; read input
+	movwf	0x42	; store input
+	movlw	0x10
+	movwf	GPIO	; reset GPIO
+	call	checkkey	
+	movlw	0x10	; wait 52 cycles
+	call	wait
+	btfsc	GPIO, 0 ; both pins must be low...
+	goto	die
+	btfsc	GPIO, 1 ; ...when no bit transfer takes place
+	goto	die	; if not -> lock cic error state -> die
+	incf	FSR, f	; next one
+	movlw	0xf
+	andwf	FSR, w
+	btfss	STATUS, Z	
+	goto	loop1
+	movlw	0x1	; wait 7
+	call	wait	;
+	nop
+	nop
+	call	mangle
+	call	mangle
+	call	mangle
+	btfsc	0x37, 0
+	goto	swap
+	banksel	TRISIO
+	bsf	TRISIO, 0
+	bcf	TRISIO, 1
+	goto	swapskip
+swap
+	banksel	TRISIO
+	bcf	TRISIO, 0
+	bsf	TRISIO, 1
+	nop
+swapskip
+	banksel GPIO
+	btfsc	GPIO, 3 ; poll master reset
+	goto	rst
+	clrf	0x43	; don't check key region anymore
+	movf	0x37, w
+	andlw	0xf
+	btfss	STATUS, Z
+	goto	loop0
+	goto	loop
+
+; --------calculate new seeds--------
+; had to be unrolled because PIC has an inefficient way of handling
+; indirect access, no post increment, no swap, etc.
+mangle
+	call	mangle_lock
+	nop
+	nop
+mangle_key
+	movf	0x2f, w
+	movwf	0x20	
+mangle_key_loop
+	addlw	0x1
+	addwf	0x21, f
+	movf	0x22, w
+	movwf	0x40
+	movf	0x21, w
+	addwf	0x22, f
+	incf	0x22, f
+	comf	0x22, f
+	movf	0x23, w
+	movwf	0x41	; store 23 to 41
+	movlw	0xf
+	andwf	0x23, f
+	movf	0x40, w ; add 40(22 old)+23+#1 and skip if carry
+	andlw	0xf
+	addwf	0x23, f
+	incf	0x23, f
+	btfsc	0x23, 4
+	goto	mangle_key_withskip
+mangle_key_withoutskip
+	movf	0x41, w ; restore 23
+	addwf	0x24, f ; add to 24
+	movf	0x25, w
+	movwf	0x40	; save 25 to 40
+	movf	0x24, w
+	addwf	0x25, f
+	movf	0x26, w
+	movwf	0x41	; save 26 to 41
+	movf	0x40, w ; restore 25
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x26, w
+	movwf	0x26
+
+	movf	0x41, w ; restore 26
+	addlw	0x1	; inc
+	addwf	0x27, f	; add to 27
+
+	movf	0x27, w ;
+	addlw	0x1	; inc
+	addwf	0x28, f ; add to 28
+
+	movf	0x28, w ;
+	addlw	0x1	; inc
+	addwf	0x29, f ; add to 29
+
+	movf	0x29, w ;
+	addlw	0x1	; inc
+	addwf	0x2a, f ; add to 2a
+
+	movf	0x2a, w ;
+	addlw	0x1	; inc
+	addwf	0x2b, f ; add to 2b
+
+	movf	0x2b, w ;
+	addlw	0x1	; inc
+	addwf	0x2c, f ; add to 2c
+
+	movf	0x2c, w ;
+	addlw	0x1	; inc
+	addwf	0x2d, f ; add to 2d
+
+	movf	0x2d, w ;
+	addlw	0x1	; inc
+	addwf	0x2e, f ; add to 2e
+
+	movf	0x2e, w ;
+	addlw	0x1	; inc
+	addwf	0x2f, f ; add to 2f
+
+	movf	0x20, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x20
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x20, 4 ; skip if half-byte carry
+	goto mangle_return ; +2 cycles in return
+	nop
+	goto mangle_key_loop
+; 69 when goto, 69 when return
+; CIC has 78 -> 9 nops
+
+mangle_key_withskip
+	movf	0x41, w ; restore 23
+	addwf	0x23, f ; add to 23
+	movf	0x24, w
+	movwf	0x40	; save 24 to 40
+	movf	0x23, w
+	addwf	0x24, f
+	movf	0x25, w
+	movwf	0x41	; save 25 to 41
+	movf	0x40, w ; restore 24
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x25, w
+	movwf	0x25
+
+	movf	0x41, w ; restore 25
+	addlw	0x1	; inc
+	addwf	0x26, f	; add to 26
+
+	movf	0x26, w ;
+	addlw	0x1	; inc
+	addwf	0x27, f ; add to 27
+
+	movf	0x27, w ;
+	addlw	0x1	; inc
+	addwf	0x28, f ; add to 28
+
+	movf	0x28, w ;
+	addlw	0x1	; inc
+	addwf	0x29, f ; add to 29
+
+	movf	0x29, w ;
+	addlw	0x1	; inc
+	addwf	0x2a, f ; add to 2a
+
+	movf	0x2a, w ;
+	addlw	0x1	; inc
+	addwf	0x2b, f ; add to 2b
+
+	movf	0x2b, w ;
+	addlw	0x1	; inc
+	addwf	0x2c, f ; add to 2c
+
+	movf	0x2c, w ;
+	addlw	0x1	; inc
+	addwf	0x2d, f ; add to 2d
+
+	movf	0x2d, w ;
+	addlw	0x1	; inc
+	addwf	0x2e, f ; add to 2e
+
+	movf	0x2e, w ;
+	addlw	0x1	; inc
+	addwf	0x2f, f ; add to 2f
+
+	movf	0x20, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x20
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x20, 4 ; skip if half-byte carry
+	goto mangle_return ; +2 cycles in return
+	nop
+	goto mangle_key_loop
+mangle_return
+	return
+; 73 when goto, 73 when return
+; CIC has 84 -> 11 nops
+
+mangle_lock
+	movf	0x3f, w
+	movwf	0x30	
+mangle_lock_loop
+	addlw	0x1
+	addwf	0x31, f
+	movf	0x32, w
+	movwf	0x40
+	movf	0x31, w
+	addwf	0x32, f
+	incf	0x32, f
+	comf	0x32, f
+	movf	0x33, w
+	movwf	0x41	; store 33 to 41
+	movlw	0xf
+	andwf	0x33, f
+	movf	0x40, w ; add 40(32 old)+33+#1 and skip if carry
+	andlw	0xf
+	addwf	0x33, f
+	incf	0x33, f
+	btfsc	0x33, 4
+	goto	mangle_lock_withskip
+mangle_lock_withoutskip
+	movf	0x41, w ; restore 33
+	addwf	0x34, f ; add to 34
+	movf	0x35, w
+	movwf	0x40	; save 35 to 40
+	movf	0x34, w
+	addwf	0x35, f
+	movf	0x36, w
+	movwf	0x41	; save 36 to 41
+	movf	0x40, w ; restore 35
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x36, w
+	movwf	0x36
+
+	movf	0x41, w ; restore 36
+	addlw	0x1	; inc
+	addwf	0x37, f	; add to 37
+
+	movf	0x37, w ;
+	addlw	0x1	; inc
+	addwf	0x38, f ; add to 38
+
+	movf	0x38, w ;
+	addlw	0x1	; inc
+	addwf	0x39, f ; add to 39
+
+	movf	0x39, w ;
+	addlw	0x1	; inc
+	addwf	0x3a, f ; add to 3a
+
+	movf	0x3a, w ;
+	addlw	0x1	; inc
+	addwf	0x3b, f ; add to 3b
+
+	movf	0x3b, w ;
+	addlw	0x1	; inc
+	addwf	0x3c, f ; add to 3c
+
+	movf	0x3c, w ;
+	addlw	0x1	; inc
+	addwf	0x3d, f ; add to 3d
+
+	movf	0x3d, w ;
+	addlw	0x1	; inc
+	addwf	0x3e, f ; add to 3e
+
+	movf	0x3e, w ;
+	addlw	0x1	; inc
+	addwf	0x3f, f ; add to 3f
+
+	movf	0x30, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x30
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x30, 4 ; skip if half-byte carry
+	goto mangle_return
+	nop
+	goto mangle_lock_loop
+; 69 when goto, 69 when return
+; CIC has 78 -> 9 nops
+	
+mangle_lock_withskip
+	movf	0x41, w ; restore 33
+	addwf	0x33, f ; add to 33
+	movf	0x34, w
+	movwf	0x40	; save 34 to 40
+	movf	0x33, w
+	addwf	0x34, f
+	movf	0x35, w
+	movwf	0x41	; save 35 to 41
+	movf	0x40, w ; restore 34
+	andlw	0xf	; mask nibble
+	addlw	0x8	; add #8 to HIGH nibble
+	movwf	0x40
+	btfss	0x40, 4 ; skip if carry to 5th bit
+	addwf	0x35, w
+	movwf	0x35
+
+	movf	0x41, w ; restore 35
+	addlw	0x1	; inc
+	addwf	0x36, f	; add to 36
+
+	movf	0x36, w ;
+	addlw	0x1	; inc
+	addwf	0x37, f ; add to 37
+
+	movf	0x37, w ;
+	addlw	0x1	; inc
+	addwf	0x38, f ; add to 38
+
+	movf	0x38, w ;
+	addlw	0x1	; inc
+	addwf	0x39, f ; add to 39
+
+	movf	0x39, w ;
+	addlw	0x1	; inc
+	addwf	0x3a, f ; add to 3a
+
+	movf	0x3a, w ;
+	addlw	0x1	; inc
+	addwf	0x3b, f ; add to 3b
+
+	movf	0x3b, w ;
+	addlw	0x1	; inc
+	addwf	0x3c, f ; add to 3c
+
+	movf	0x3c, w ;
+	addlw	0x1	; inc
+	addwf	0x3d, f ; add to 3d
+
+	movf	0x3d, w ;
+	addlw	0x1	; inc
+	addwf	0x3e, f ; add to 3e
+
+	movf	0x3e, w ;
+	addlw	0x1	; inc
+	addwf	0x3f, f ; add to 3f
+
+	movf	0x30, w ; restore original 0xf
+	andlw	0xf
+	addlw	0xf
+	movwf	0x30
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	btfss	0x30, 4 ; skip if half-byte carry
+	goto mangle_return
+	nop
+	goto mangle_lock_loop
+; 73 when goto, 73 when return
+; CIC has 84 -> 11 nops
+
+; --------wait: 3*(W-1)+7 cycles (including call+return). W=0 -> 256!--------
+wait	
+	movwf	0x4f
+wait0	decfsz	0x4f, f
+	goto	wait0
+	return	
+
+; --------wait long: 8+(3*(w-1))+(772*w). W=0 -> 256!--------
+longwait
+	movwf	0x4e
+	clrw
+longwait0
+	call	wait
+	decfsz	0x4e, f
+	goto	longwait0
+	return
+
+; --------die (do nothing, wait for reset)--------
+die
+	btfsc	GPIO, 3
+	goto	rst
+	goto	die
+
+; --------check the key input and change "region" when appropriate--------
+; --------requires 17 cycles (incl. call+return)
+checkkey
+	btfss	0x43, 0			; first time?
+	goto 	checkkey_nocheck	; if not, just burn some cycles
+	movlw	0x22			; are we at the correct stream offset?
+	xorwf	FSR, w
+	btfss	STATUS, Z		; if not equal:
+	goto	checkkey_nocheck2	; burn some cycles less.
+					; if equal do the check
+	btfss	0x42, 0			; if value from slave is set it's a 411
+	goto	check_413
+check_411
+	nop				; to compensate for untaken branch
+	movlw	0x9
+	goto	check_save
+check_413
+	movlw	0x6
+	goto	check_save
+
+checkkey_nocheck
+	nop
+	nop
+	nop
+	nop
+checkkey_nocheck2
+	nop
+	nop
+	nop
+	nop
+	goto check_done
+check_save
+	movwf	0x32
+check_done
+	return
+end
+; ------------------------------------------------------------------------

cic/supercic/1chip-5060.sch

@@ -0,0 +1,401 @@
+EESchema Schematic File Version 2  date Mon 07 Jun 2010 05:23:48 AM CEST
+LIBS:power
+LIBS:device
+LIBS:transistors
+LIBS:conn
+LIBS:linear
+LIBS:regul
+LIBS:74xx
+LIBS:cmos4000
+LIBS:adc-dac
+LIBS:memory
+LIBS:xilinx
+LIBS:special
+LIBS:microcontrollers
+LIBS:dsp
+LIBS:microchip
+LIBS:analog_switches
+LIBS:motorola
+LIBS:texas
+LIBS:intel
+LIBS:audio
+LIBS:interface
+LIBS:digital-audio
+LIBS:philips
+LIBS:display
+LIBS:cypress
+LIBS:siliconi
+LIBS:opto
+LIBS:atmel
+LIBS:contrib
+LIBS:valves
+EELAYER 24  0
+EELAYER END
+$Descr A4 11700 8267
+Sheet 1 1
+Title "1chip-5060.sch"
+Date "7 jun 2010"
+Rev "A"
+Comp "ikari_01"
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
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+Oscillators / Oszillatoren
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cic/supercic/supercic.sch

@@ -0,0 +1,357 @@
+EESchema Schematic File Version 2  date Sun 06 Jun 2010 03:26:33 AM CEST
+LIBS:power
+LIBS:device
+LIBS:transistors
+LIBS:conn
+LIBS:linear
+LIBS:regul
+LIBS:74xx
+LIBS:cmos4000
+LIBS:adc-dac
+LIBS:memory
+LIBS:xilinx
+LIBS:special
+LIBS:microcontrollers
+LIBS:dsp
+LIBS:microchip
+LIBS:analog_switches
+LIBS:motorola
+LIBS:texas
+LIBS:intel
+LIBS:audio
+LIBS:interface
+LIBS:digital-audio
+LIBS:philips
+LIBS:display
+LIBS:cypress
+LIBS:siliconi
+LIBS:opto
+LIBS:atmel
+LIBS:contrib
+LIBS:valves
+LIBS:sd2snes-cache
+EELAYER 24  0
+EELAYER END
+$Descr A4 11700 8267
+Sheet 1 1
+Title "SuperCIC lock - other connections"
+Date "6 jun 2010"
+Rev "A"
+Comp "ikari_01"
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+Text Notes 1800 1700 0    60   ~ 0
+©2010 ikari_01
+Text Notes 1100 1900 0    100  ~ 0
+"SNES" connections: see SNES connection diagram
+Wire Wire Line
+	3200 6150 3200 6550
+Wire Wire Line
+	2900 5750 2900 5550
+Wire Wire Line
+	3200 5750 3200 5650
+Wire Wire Line
+	3200 5650 2600 5650
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
+	4550 6150 4350 6150
+Wire Wire Line
+	4450 6050 4550 6050
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
+	4550 6650 4450 6650
+Wire Wire Line
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+Wire Wire Line
+	5250 6450 5450 6450
+Wire Wire Line
+	5250 6650 5450 6650
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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misc/igr/COPYING

@@ -0,0 +1,339 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
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+
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+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+Whether that is true depends on what the Program does.
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+
+  2. You may modify your copy or copies of the Program or any portion
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+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
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+
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+
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+    it under the terms of the GNU General Public License as published by
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+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
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+
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+parts of the General Public License.  Of course, the commands you use may
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+
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+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

misc/igr/snes-igr.asm

@@ -0,0 +1,328 @@
+    #include <p16f630.inc>
+
+; -----------------------------------------------------------------------
+;   SNES "In-game reset" (IGR) controller
+;
+;   Copyright (C) 2010 by Maximilian Rehkopf <otakon@gmx.net>
+;
+;   This program is free software; you can redistribute it and/or modify
+;   it under the terms of the GNU General Public License as published by
+;   the Free Software Foundation; version 2 of the License only.
+;
+;   This program is distributed in the hope that it will be useful,
+;   but WITHOUT ANY WARRANTY; without even the implied warranty of
+;   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;   GNU General Public License for more details.
+;
+;   You should have received a copy of the GNU General Public License
+;   along with this program; if not, write to the Free Software
+;   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+;
+; -----------------------------------------------------------------------
+;
+;   This program is designed to run on a PIC 16F630 microcontroller connected
+;   to the controller port and SNES main board. It allows an SNES to be reset
+;   and region switched via a standard controller.
+;
+;   pin configuration: (controller port pin) [other connection]
+;                                              ,-----_-----.
+;                                      +5V (1) |1        14| GND (7)
+;   Reset out [to CIC pin 8 / SuperCIC pin 13] |2  A5 A0 13| serial data in(4)
+;                        50/60Hz out [to PPUs] |3  A4 A1 12| latch in(3)
+;            50/60Hz in [from SuperCIC pin 12] |4  A3 A2 11| clk in(2)
+;                                LED out - grn |5  C5 C0 10| LED in - grn [from SuperCIC pin 5]
+;                                LED out - red |6  C4 C1  9| LED in - red [from SuperCIC pin 6]
+;                                  LED_TYPE in |7  C3 C2  8| SuperCIC present
+;                                              `-----------'
+;
+;   Pin 4 should be connected to SuperCIC pin 12 if a SuperCIC is used.
+;
+;   Pin 7 (LED_TYPE) sets the output mode for the LED pins
+;   (must be tied to either level):
+;      low  = common cathode
+;      high = common anode   (output inverted)
+;
+;   Pin 8 should be connected as follows:
+;      low = no SuperCIC present
+;      high = SuperCIC present
+;
+;   controller pin numbering
+;   ========================
+;        _______________________________
+;       |                 |             \
+;       | (1) (2) (3) (4) | (5) (6) (7)  )
+;       |_________________|_____________/
+;
+;
+;   key mapping: L + R + Select +                               (stream data)
+;   =============================
+;   Start       Reset (normal)                                  0xcf 0xcf
+;   X           Reset (6s)                                      0xdf 0x8f
+;
+;   Y           Region 50Hz/PAL                                 0x9f 0xcf
+;   A           Region 60Hz/NTSC                                0xdf 0x4f
+;   B           Region from SuperCIC (SuperCIC only)            0x5f 0xcf
+;
+;   functional description:
+;   =======================
+;   Reset (normal):      simply resets the console.
+;   Reset (6s):          resets the console for >5s to enter main menu on
+;                        PowerPak and sd2snes.
+;                        In SuperCIC mode this actually issues a reset
+;                        "doubleclick" to trigger the SuperCIC's long reset
+;                        function.
+;
+;   Region 50Hz/PAL      overrides the region to 50Hz/PAL.
+;   Region 60Hz/NTSC     overrides the region to 60Hz/NTSC.
+;   Region from SuperCIC sets the region according to the input level of
+;                        pin 4 (+5V = 50Hz, 0V = 60Hz). In this mode the
+;                        region is updated constantly.
+;                        This function is only available in SuperCIC mode
+;                        (pin 8 = 5V).
+;
+; -----------------------------------------------------------------------
+; Configuration bits: adapt to your setup and needs
+    __CONFIG _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_OFF & _MCLRE_OFF & _BODEN & _CP_OFF & _CPD_OFF
+
+; -----------------------------------------------------------------------
+; relocatable code
+PROG CODE
+start
+        banksel PORTA
+        clrf    PORTA
+        movlw   0x07            ; PORTA2..0 are digital I/O (not connected to comparator)
+        movwf   CMCON
+        movlw   0x00            ; disable all interrupts
+        movwf   INTCON
+        banksel TRISA
+        movlw   0x2f            ; in out in in in in
+        movwf   TRISA
+        movlw   0x0f            ; out out in in in in
+        movwf   TRISC
+        movlw   0x00            ; no pullups
+        movwf   WPUA
+        movlw   0x80            ; global pullup disable
+        movwf   OPTION_REG
+	banksel	PORTA
+	bsf	PORTA, 5
+
+;	tits	GTFO
+
+	clrf	0x24
+	btfsc	PORTC, 2
+	bsf	0x24, 1
+
+	clrf	0x23
+	btfss	0x24, 1		; SuperCIC absent?
+	goto	doregion_60	; then set defaults
+	
+	bsf	0x23, 1		; else enable passthru
+
+idle
+; check region passthru
+	btfss	0x23, 1		; passthru enabled?
+	goto	waitforlatch_h	; 
+	btfsc	PORTA, 3
+	bsf	PORTA, 4
+	btfss	PORTA, 3
+	bcf	PORTA, 4
+	call	setleds_passthru
+waitforlatch_h	; wait for "latch" to become high
+	btfss	PORTA, 1
+	goto	idle
+
+
+waitforlatch_l	; wait for "latch" to become low
+	btfsc	PORTA, 1
+	goto	waitforlatch_l
+
+
+	clrf	0x20
+	clrf	0x21
+	clrf	0x22
+	bcf	STATUS, C	; clear carry
+dl1
+	movf	PORTA, w		;read data bit
+	rlf	0x20, f		;shift
+	andlw	0x1	
+	iorwf	0x20, f		;put in data reg
+	incf	0x22, f		;inc bit count
+dl1_wait
+	btfss	PORTA, 2		;wait for clk=h
+	goto	dl1_wait
+	btfss	0x22, 3		;first byte done?
+	goto	dl1
+	clrf	0x22
+dl2
+	movf	PORTA, w		;read data bit
+	rlf	0x21, f		;shift
+	andlw	0x1	
+	iorwf	0x21, f		;put in data reg
+	incf	0x22, f		;inc bit count
+dl2_wait
+	btfss	PORTA, 2		;wait for clk=h
+	goto	dl2_wait
+	btfss	0x22, 2		; read only 4 bits
+	goto	dl2
+
+
+	
+
+checkkeys
+; we now have the first 8 bits in 0x20 and the second 4 bits in 0x21
+	; 00011111 00011111 = ABXY, Select, L
+	movlw	0x04
+	xorwf	0x21, w
+	btfsc	STATUS, Z
+	goto	group04
+	movlw	0x08
+	xorwf	0x21, w
+	btfsc	STATUS, Z
+	goto	group08
+	movlw	0x0c
+	xorwf	0x21, w
+	btfsc	STATUS, Z
+	goto	group0c
+	goto	idle
+
+group04
+	movlw	0xdf
+	xorwf	0x20, w
+	btfss	STATUS, Z
+	goto	idle
+	goto	doregion_60
+
+group08
+	movlw	0xdf
+	xorwf	0x20, w
+	btfss	STATUS, Z
+	goto	idle
+	btfss	0x24, 1		; SuperCIC absent?
+	goto	doreset_long	; then do long reset
+	goto	doreset_dbl	; else do dbl reset
+
+group0c
+	movlw	0x5f
+	xorwf	0x20, w
+	btfsc	STATUS, Z
+	goto	doregion_passthru
+	movlw	0x9f
+	xorwf	0x20, w
+	btfsc	STATUS, Z
+	goto	doregion_50
+	movlw	0xcf
+	xorwf	0x20, w
+	btfsc	STATUS, Z
+	goto	doreset_normal
+	goto	idle
+
+doreset_normal
+	banksel	TRISA
+	bcf	TRISA, 5
+	banksel	PORTA
+	bsf	PORTA, 5
+	movlw	0x15
+	call	longwait
+	banksel TRISA
+	bsf	TRISA, 5
+	banksel	PORTA
+	goto	idle
+
+doreset_dbl
+	banksel	TRISA
+	bcf	TRISA, 5
+	banksel	PORTA
+	bsf	PORTA, 5
+	movlw	0x15
+	call	longwait
+	banksel	TRISA
+	bsf	TRISA, 5
+	clrw
+	call	longwait
+	bcf	TRISA, 5
+	movlw	0x15
+	call	longwait
+	banksel	TRISA
+	bsf	TRISA, 5
+	banksel	PORTA
+	goto	idle
+
+doreset_long
+	banksel	TRISA
+	bcf	TRISA, 5
+	banksel	PORTA
+	bsf	PORTA, 5
+	movlw	0x1e
+	call	superlongwait
+	banksel	TRISA
+	bsf	TRISA, 5
+	banksel	PORTA
+	goto	idle
+
+doregion_50
+	bsf	PORTA, 4
+	clrf	0x23
+	call	setleds_own
+	goto	idle
+
+doregion_60
+	bcf	PORTA, 4
+	clrf	0x23
+	call	setleds_own
+	goto	idle
+
+doregion_passthru
+	clrf	0x23
+	btfsc	0x24, 1		; SuperCIC present?
+	bsf	0x23, 1		; then enable passthru
+	goto	idle
+
+; --------wait: 3*(W-1)+7 cycles (including call+return). W=0 -> 256!--------
+wait
+        movwf   0x2f
+wait0   decfsz  0x2f, f
+        goto    wait0
+        goto	longwait1
+
+; --------wait long: 8+(3*(w-1))+(772*w). W=0 -> 256!--------
+longwait
+        movwf   0x2e
+        clrw
+longwait0
+        goto	wait
+longwait1
+        decfsz  0x2e, f
+        goto    longwait0
+        return
+
+; --------wait extra long: 8+(3*(w-1))+(198405*w).
+superlongwait
+	movwf	0x2d
+	clrw
+superlongwait0
+	call	longwait
+	decfsz	0x2d, f
+	goto	superlongwait0
+	return
+
+setleds
+	btfss	0x24, 1
+	goto	setleds_own
+setleds_passthru
+	clrw
+	btfsc	PORTC, 0	; green LED	
+	iorlw	0x20
+	btfsc	PORTC, 1	; red LED
+	iorlw	0x10
+	movwf	PORTC
+	return
+
+setleds_own
+	movlw	0x20		; assume green LED
+	btfss	PORTA, 4
+	movlw	0x10		; if PORTA.4 is low -> red LED
+	btfsc	PORTC, 3	; if common anode:
+	xorlw	0x30		; invert output
+	movwf	PORTC	
+	return
+END

misc/igr/snes-igr.hex

@@ -0,0 +1,28 @@
+:020000040000FA
+:100000008312031385010730990000308B0083169B
+:1000100003132F3085000F308700003095008030AB
+:100020008100831203138516A4010719A414A301E8
+:10003000A41C9928A314A31C222885190516851D24
+:100040000512B320851C1B2885182428A001A101B6
+:10005000A20103100508A00D0139A004A20A051D84
+:100060002F28A21D2A28A2010508A10D0139A104EB
+:10007000A20A051D3928221D34280430210603193F
+:100080004A280830210603194F280C30210603198D
+:1000900056281B28DF302006031D1B289928DF3037
+:1000A0002006031D1B28A41C872871285F3020060A
+:1000B00003199D289F30200603199528CF3020066C
+:1000C000031963281B288316031385128312031355
+:1000D00085161530A5208316031385168312031386
+:1000E0001B288316031385128312031385161530FC
+:1000F000A5208316031385160301A520851215304C
+:10010000A520831603138516831203131B28831659
+:10011000031385128312031385161E30AB2083163A
+:1001200003138516831203131B280516A301BA2097
+:100130001B280512A301BA201B28A301A418A3148D
+:100140001B28AF00AF0BA228A828AE000301A128EE
+:10015000AE0BA7280800AD000301A520AD0BAD280C
+:100160000800A41CBA280301071820388718103883
+:10017000870008002030051E10308719303A8700AC
+:02018000080075
+:02400E00D43F9D
+:00000001FF

mk1-src/Makefile

@@ -0,0 +1,619 @@
+# Hey Emacs, this is a -*- makefile -*-
+
+# Define version number
+MAJOR = 0
+MINOR = 0
+PATCHLEVEL = 1
+FIX =
+
+# Forces bootloader version to 0, comment out for release
+#PRERELEASE =
+
+#----------------------------------------------------------------------------
+# WinAVR Makefile Template written by Eric B. Weddington, Joerg Wunsch, et al.
+#
+# Released to the Public Domain
+#
+# Additional material for this makefile was written by:
+# Peter Fleury
+# Tim Henigan
+# Colin O'Flynn
+# Reiner Patommel
+# Markus Pfaff
+# Sander Pool
+# Frederik Rouleau
+# Carlos Lamas
+#
+#
+# Extensively modified for sd2iec by Ingo Korb
+#
+# To rebuild project do "make clean" then "make all".
+#----------------------------------------------------------------------------
+
+# Read configuration file
+ifdef CONFIG
+ CONFIGSUFFIX = $(CONFIG:config%=%)
+else
+ CONFIG = config
+ CONFIGSUFFIX =
+endif
+
+# Enable verbose compilation with "make V=1"
+ifdef V
+ Q :=
+ E := @:
+else
+ Q := @
+ E := @echo
+endif
+
+# Include the configuration file
+include $(CONFIG)
+
+# Set MCU name and length of binary for bootloader
+# WARNING: Fuse settings not tested!
+MCU := $(CONFIG_MCU)
+ifeq ($(MCU),atmega128)
+  BINARY_LENGTH = 0x1f000
+#  EFUSE = 0xff
+#  HFUSE = 0x91
+#  LFUSE = 0xaf
+else ifeq ($(MCU),atmega1281)
+  BINARY_LENGTH = 0x1f000
+  BOOTLDRSIZE = 0x0800
+  EFUSE = 0xff
+  HFUSE = 0xd2
+  LFUSE = 0xfc
+else ifeq ($(MCU),atmega2561)
+  BINARY_LENGTH = 0x3f000
+  EFUSE = 0xfd
+  HFUSE = 0x93
+  LFUSE = 0xef
+else ifeq ($(MCU),atmega644)
+  BINARY_LENGTH = 0xf000
+  EFUSE = 0xfd
+  HFUSE = 0x91
+#  LFUSE = 0xef
+  LFUSE = 0xaf
+else ifeq ($(MCU),atmega644p)
+  BINARY_LENGTH = 0xf000
+  EFUSE = 0xfd
+  HFUSE = 0x91
+  LFUSE = 0xef
+else
+.PHONY: nochip
+nochip:
+	@echo '=============================================================='
+	@echo 'No known target chip specified.'
+	@echo
+	@echo 'Please edit the Makefile.'
+	@exit 1
+endif
+
+# Directory for all generated files
+OBJDIR := obj-$(CONFIG_MCU:atmega%=m%)$(CONFIGSUFFIX)
+
+# Output format. (can be srec, ihex, binary)
+FORMAT = ihex
+
+
+# Target file name (without extension).
+TARGET = $(OBJDIR)/sd2snes
+
+# List C source files here. (C dependencies are automatically generated.)
+SRC = main.c ff.c utils.c led.c diskio.c sdcard.c spi.c crc7.c snes.c fpga.c memory.c crc16.c fileops.c fpga_spi.c smc.c filetypes.c
+
+ifeq ($(CONFIG_UART_DEBUG),y)
+  SRC += uart.c
+endif
+
+# List Assembler source files here.
+#     Make them always end in a capital .S.  Files ending in a lowercase .s
+#     will not be considered source files but generated files (assembler
+#     output from the compiler), and will be deleted upon "make clean"!
+#     Even though the DOS/Win* filesystem matches both .s and .S the same,
+#     it will preserve the spelling of the filenames, and gcc itself does
+#     care about how the name is spelled on its command-line.
+ASRC =
+
+# Optimization level, can be [0, 1, 2, 3, s].
+#     0 = turn off optimization. s = optimize for size.
+#     (Note: 3 is not always the best optimization level. See avr-libc FAQ.)
+# Use s -mcall-prologues when you really need size...
+OPT = s
+#OPT = 3 -finline-functions
+
+# Debugging format.
+#     Native formats for AVR-GCC's -g are dwarf-2 [default] or stabs.
+#     AVR Studio 4.10 requires dwarf-2.
+#     AVR [Extended] COFF format requires stabs, plus an avr-objcopy run.
+DEBUG = dwarf-2
+
+
+# List any extra directories to look for include files here.
+#     Each directory must be seperated by a space.
+#     Use forward slashes for directory separators.
+#     For a directory that has spaces, enclose it in quotes.
+EXTRAINCDIRS =
+
+
+# Compiler flag to set the C Standard level.
+#     c89   = "ANSI" C
+#     gnu89 = c89 plus GCC extensions
+#     c99   = ISO C99 standard (not yet fully implemented)
+#     gnu99 = c99 plus GCC extensions
+CSTANDARD = -std=gnu99
+
+
+# Place -D or -U options here
+CDEFS = -DF_CPU=$(CONFIG_MCU_FREQ)UL
+
+# Calculate bootloader version
+ifdef PRERELEASE
+BOOT_VERSION := 0
+else
+BOOT_VERSION := 0x$(MAJOR)$(MINOR)$(PATCHLEVEL)$(FIX)
+endif
+
+# Create a version number define
+ifdef PATCHLEVEL
+ifdef FIX
+PROGRAMVERSION := $(MAJOR).$(MINOR).$(PATCHLEVEL).$(FIX)
+else
+PROGRAMVERSION := $(MAJOR).$(MINOR).$(PATCHLEVEL)
+BOOT_VERSION := $(BOOT_VERSION)0
+endif
+else
+PROGRAMVERSION := $(MAJOR).$(MINOR)
+BOOT_VERSION := $(BOOT_VERSION)00
+endif
+
+ifdef PRERELEASE
+PROGRAMVERSION := $(PROGRAMVERSION)$(PRERELEASE)
+endif
+
+LONGVERSION := -$(CONFIG_MCU:atmega%=m%)$(CONFIGSUFFIX)
+
+CDEFS += -DVERSION=\"$(PROGRAMVERSION)\" -DLONGVERSION=\"$(LONGVERSION)\"
+
+# Place -I options here
+CINCS =
+
+
+# Define programs and commands.
+# CC must be defined here to generate the correct CFLAGS
+SHELL = sh
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+SIZE = avr-size
+NM = avr-nm
+AVRDUDE = avrdude
+REMOVE = rm -f
+COPY = cp
+WINSHELL = cmd
+
+
+#---------------- Compiler Options ----------------
+#  -g*:          generate debugging information
+#  -O*:          optimization level
+#  -f...:        tuning, see GCC manual and avr-libc documentation
+#  -Wall...:     warning level
+#  -Wa,...:      tell GCC to pass this to the assembler.
+#    -adhlns...: create assembler listing
+CFLAGS = -g$(DEBUG)
+CFLAGS += $(CDEFS) $(CINCS)
+CFLAGS += -O$(OPT)
+CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
+CFLAGS += -Wall -Wstrict-prototypes -Werror
+CFLAGS += -Wa,-adhlns=$(OBJDIR)/$(<:.c=.lst)
+CFLAGS += -I$(OBJDIR)
+CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
+CFLAGS += $(CSTANDARD)
+CFLAGS += -ffunction-sections -fdata-sections
+#CFLAGS += -mcall-prologues
+
+# these are needed for GCC 4.3.2, which is more aggressive at inlining
+# gcc-4.2 knows one of those, but it tends to increase code size
+ifeq ($(shell $(CC) --version|gawk -f gcctest.awk),YES)
+CFLAGS += --param inline-call-cost=3
+CFLAGS += -fno-inline-small-functions
+CFLAGS += -fno-move-loop-invariants
+CFLAGS += -fno-split-wide-types
+
+# turn these on to keep the functions in the same order as in the source
+# this is only useful if you're looking at disassembly
+#CFLAGS += -fno-reorder-blocks
+#CFLAGS += -fno-reorder-blocks-and-partition
+#CFLAGS += -fno-reorder-functions
+#CFLAGS += -fno-toplevel-reorder
+endif
+
+ifeq ($(CONFIG_STACK_TRACKING),y)
+  CFLAGS += -finstrument-functions
+endif
+
+
+#---------------- Assembler Options ----------------
+#  -Wa,...:   tell GCC to pass this to the assembler.
+#  -ahlms:    create listing
+#  -gstabs:   have the assembler create line number information; note that
+#             for use in COFF files, additional information about filenames
+#             and function names needs to be present in the assembler source
+#             files -- see avr-libc docs [FIXME: not yet described there]
+ASFLAGS = -Wa,-adhlns=$(OBJDIR)/$(<:.S=.lst),-gstabs -I$(OBJDIR)
+
+
+#---------------- Library Options ----------------
+# Minimalistic printf version
+PRINTF_LIB_MIN = -Wl,-u,vfprintf -lprintf_min
+
+# Floating point printf version (requires MATH_LIB = -lm below)
+PRINTF_LIB_FLOAT = -Wl,-u,vfprintf -lprintf_flt
+
+# If this is left blank, then it will use the Standard printf version.
+PRINTF_LIB =
+#PRINTF_LIB = $(PRINTF_LIB_MIN)
+#PRINTF_LIB = $(PRINTF_LIB_FLOAT)
+
+
+# Minimalistic scanf version
+SCANF_LIB_MIN = -Wl,-u,vfscanf -lscanf_min
+
+# Floating point + %[ scanf version (requires MATH_LIB = -lm below)
+SCANF_LIB_FLOAT = -Wl,-u,vfscanf -lscanf_flt
+
+# If this is left blank, then it will use the Standard scanf version.
+SCANF_LIB =
+#SCANF_LIB = $(SCANF_LIB_MIN)
+#SCANF_LIB = $(SCANF_LIB_FLOAT)
+
+
+MATH_LIB = -lm
+
+
+
+#---------------- External Memory Options ----------------
+
+# 64 KB of external RAM, starting after internal RAM (ATmega128!),
+# used for variables (.data/.bss) and heap (malloc()).
+#EXTMEMOPTS = -Wl,-Tdata=0x801100,--defsym=__heap_end=0x80ffff
+
+# 64 KB of external RAM, starting after internal RAM (ATmega128!),
+# only used for heap (malloc()).
+#EXTMEMOPTS = -Wl,--defsym=__heap_start=0x801100,--defsym=__heap_end=0x80ffff
+
+EXTMEMOPTS =
+
+
+
+#---------------- Linker Options ----------------
+#  -Wl,...:     tell GCC to pass this to linker.
+#    -Map:      create map file
+#    --cref:    add cross reference to  map file
+LDFLAGS = -Wl,-Map=$(TARGET).map,--cref
+LDFLAGS += $(EXTMEMOPTS)
+LDFLAGS += $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB)
+LDFLAGS += -Wl,--gc-sections
+ifeq ($(CONFIG_LINKER_RELAX),y)
+  LDFLAGS += -Wl,-O9,--relax
+endif
+
+
+
+#---------------- Programming Options (avrdude) ----------------
+
+# Programming hardware: alf avr910 avrisp bascom bsd
+# dt006 pavr picoweb pony-stk200 sp12 stk200 stk500 stk500v2
+#
+# Type: avrdude -c ?
+# to get a full listing.
+#
+AVRDUDE_PROGRAMMER = dragon_isp
+
+# com1 = serial port. Use lpt1 to connect to parallel port.
+AVRDUDE_PORT = usb   # programmer connected to serial device
+
+AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex
+# AVRDUDE_WRITE_EEPROM = -U eeprom:w:$(TARGET).eep
+
+# Allow fuse overrides from the config file
+ifdef CONFIG_EFUSE
+  EFUSE := CONFIG_EFUSE
+endif
+ifdef CONFIG_HFUSE
+  HFUSE := CONFIG_HFUSE
+endif
+ifdef CONFIG_LFUSE
+  LFUSE := CONFIG_LFUSE
+endif
+
+# Calculate command line arguments for fuses
+AVRDUDE_WRITE_FUSES :=
+ifdef EFUSE
+  AVRDUDE_WRITE_FUSES += -U efuse:w:$(EFUSE):m
+endif
+ifdef HFUSE
+  AVRDUDE_WRITE_FUSES += -U hfuse:w:$(HFUSE):m
+endif
+ifdef LFUSE
+  AVRDUDE_WRITE_FUSES += -U lfuse:w:$(LFUSE):m
+endif
+
+
+# Uncomment the following if you want avrdude's erase cycle counter.
+# Note that this counter needs to be initialized first using -Yn,
+# see avrdude manual.
+AVRDUDE_ERASE_COUNTER = -y
+
+# Uncomment the following if you do /not/ wish a verification to be
+# performed after programming the device.
+#AVRDUDE_NO_VERIFY = -V
+
+# Increase verbosity level.  Please use this when submitting bug
+# reports about avrdude. See <http://savannah.nongnu.org/projects/avrdude>
+# to submit bug reports.
+#AVRDUDE_VERBOSE = -v -v
+
+AVRDUDE_FLAGS = -p $(MCU) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER)
+AVRDUDE_FLAGS += $(AVRDUDE_NO_VERIFY)
+AVRDUDE_FLAGS += $(AVRDUDE_VERBOSE)
+AVRDUDE_FLAGS += $(AVRDUDE_ERASE_COUNTER)
+
+
+
+#---------------- Debugging Options ----------------
+
+# For simulavr only - target MCU frequency.
+DEBUG_MFREQ = $(CONFIG_MCU_FREQ)
+
+# Set the DEBUG_UI to either gdb or insight.
+# DEBUG_UI = gdb
+DEBUG_UI = insight
+
+# Set the debugging back-end to either avarice, simulavr.
+DEBUG_BACKEND = avarice
+#DEBUG_BACKEND = simulavr
+
+# GDB Init Filename.
+GDBINIT_FILE = __avr_gdbinit
+
+# When using avarice settings for the JTAG
+JTAG_DEV = /dev/com1
+
+# Debugging port used to communicate between GDB / avarice / simulavr.
+DEBUG_PORT = 4242
+
+# Debugging host used to communicate between GDB / avarice / simulavr, normally
+#     just set to localhost unless doing some sort of crazy debugging when
+#     avarice is running on a different computer.
+DEBUG_HOST = localhost
+
+
+
+#============================================================================
+
+
+# De-dupe the list of C source files
+CSRC := $(sort $(SRC))
+
+# Define all object files.
+OBJ := $(patsubst %,$(OBJDIR)/%,$(CSRC:.c=.o) $(ASRC:.S=.o))
+
+# Define all listing files.
+LST := $(patsubst %,$(OBJDIR)/%,$(CSRC:.c=.lst) $(ASRC:.S=.lst))
+
+
+# Compiler flags to generate dependency files.
+GENDEPFLAGS = -MMD -MP -MF .dep/$(@F).d
+
+
+# Combine all necessary flags and optional flags.
+# Add target processor to flags.
+ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) $(GENDEPFLAGS)
+ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS) $(CDEFS)
+
+
+
+
+
+# Default target.
+all: build
+
+build: elf bin hex
+	$(E) "  SIZE   $(TARGET).elf"
+	$(Q)$(ELFSIZE)|grep -v debug
+
+elf: $(TARGET).elf
+bin: $(TARGET).bin
+hex: $(TARGET).hex
+eep: $(TARGET).eep
+lss: $(TARGET).lss
+sym: $(TARGET).sym
+
+# A little helper target for the maintainer =)
+copy2card:
+	mount /mnt
+	cp $(TARGET).bin /mnt
+	umount /mnt
+	sync
+
+
+# Doxygen output:
+doxygen:
+	-rm -rf doxyinput
+	mkdir doxyinput
+	cp *.h *.c doxyinput
+	src2doxy.pl doxyinput/*.h doxyinput/*.c
+	doxygen doxygen.conf
+
+# Display size of file.
+HEXSIZE = $(SIZE) --target=$(FORMAT) $(TARGET).hex
+ELFSIZE = $(SIZE) -A $(TARGET).elf
+AVRMEM = avr-mem.sh $(TARGET).elf $(MCU)
+
+# Program the device.
+program: bin hex eep
+	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH)  $(AVRDUDE_WRITE_EEPROM)
+
+# Set fuses of the device
+fuses: $(CONFIG)
+	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FUSES)
+
+# Generate avr-gdb config/init file which does the following:
+#     define the reset signal, load the target file, connect to target, and set
+#     a breakpoint at main().
+gdb-config:
+	@$(REMOVE) $(GDBINIT_FILE)
+	@echo define reset >> $(GDBINIT_FILE)
+	@echo SIGNAL SIGHUP >> $(GDBINIT_FILE)
+	@echo end >> $(GDBINIT_FILE)
+	@echo file $(TARGET).elf >> $(GDBINIT_FILE)
+	@echo target remote $(DEBUG_HOST):$(DEBUG_PORT)  >> $(GDBINIT_FILE)
+ifeq ($(DEBUG_BACKEND),simulavr)
+	@echo load  >> $(GDBINIT_FILE)
+endif
+	@echo break main >> $(GDBINIT_FILE)
+
+debug: gdb-config $(TARGET).elf
+ifeq ($(DEBUG_BACKEND), avarice)
+	@echo Starting AVaRICE - Press enter when "waiting to connect" message displays.
+	@$(WINSHELL) /c start avarice --jtag $(JTAG_DEV) --erase --program --file \
+	$(TARGET).elf $(DEBUG_HOST):$(DEBUG_PORT)
+	@$(WINSHELL) /c pause
+
+else
+	@$(WINSHELL) /c start simulavr --gdbserver --device $(MCU) --clock-freq \
+	$(DEBUG_MFREQ) --port $(DEBUG_PORT)
+endif
+	@$(WINSHELL) /c start avr-$(DEBUG_UI) --command=$(GDBINIT_FILE)
+
+
+
+
+# Convert ELF to COFF for use in debugging / simulating in AVR Studio or VMLAB.
+COFFCONVERT=$(OBJCOPY) --debugging \
+--change-section-address .data-0x800000 \
+--change-section-address .bss-0x800000 \
+--change-section-address .noinit-0x800000 \
+--change-section-address .eeprom-0x810000
+
+
+coff: $(TARGET).elf
+	$(COFFCONVERT) -O coff-avr $< $(TARGET).cof
+
+
+extcoff: $(TARGET).elf
+	$(COFFCONVERT) -O coff-ext-avr $< $(TARGET).cof
+
+
+# Generate autoconf.h from config
+.PRECIOUS : $(OBJDIR)/autoconf.h
+$(OBJDIR)/autoconf.h: $(CONFIG) | $(OBJDIR)
+	$(E) "  CONF2H $(CONFIG)"
+	$(Q)gawk -f conf2h.awk $(CONFIG) > $(OBJDIR)/autoconf.h
+
+# Create final output files (.hex, .eep) from ELF output file.
+ifeq ($(CONFIG_BOOTLOADER),y)
+$(OBJDIR)/%.bin: $(OBJDIR)/%.elf
+	$(E) "  BIN    $@"
+	$(Q)$(OBJCOPY) -O binary -R .eeprom $< $@
+	$(E) "  CRCGEN $@"
+	-$(Q)crcgen-new $@ $(BINARY_LENGTH) $(CONFIG_BOOT_DEVID) $(BOOT_VERSION)
+	$(E) "  COPY   $(CONFIG_HARDWARE_NAME)-firmware-$(PROGRAMVERSION).bin"
+	$(Q)$(COPY) $@ $(OBJDIR)/$(CONFIG_HARDWARE_NAME)-firmware-$(PROGRAMVERSION).bin
+else
+$(OBJDIR)/%.bin: $(OBJDIR)/%.elf
+	$(E) "  BIN    $@"
+	$(Q)$(OBJCOPY) -O binary -R .eeprom $< $@
+endif
+
+
+$(OBJDIR)/%.hex: $(OBJDIR)/%.elf
+	$(E) "  HEX    $@"
+	$(Q)$(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@
+
+$(OBJDIR)/%.eep: $(OBJDIR)/%.elf
+	-$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
+	--change-section-lma .eeprom=0 -O $(FORMAT) $< $@
+
+# Create extended listing file from ELF output file.
+$(OBJDIR)/%.lss: $(OBJDIR)/%.elf
+	$(E) "  LSS    $<"
+	$(Q)$(OBJDUMP) -h -S $< > $@
+
+# Create a symbol table from ELF output file.
+$(OBJDIR)/%.sym: $(OBJDIR)/%.elf
+	$(E) "  SYM    $<"
+	$(E)$(NM) -n $< > $@
+
+
+
+# Link: create ELF output file from object files.
+.SECONDARY : $(TARGET).elf
+.PRECIOUS : $(OBJ)
+$(OBJDIR)/%.elf: $(OBJ)
+	$(E) "  LINK   $@"
+	$(Q)$(CC) $(ALL_CFLAGS) $^ --output $@ $(LDFLAGS)
+
+
+# Compile: create object files from C source files.
+$(OBJDIR)/%.o : %.c | $(OBJDIR) $(OBJDIR)/autoconf.h
+	$(E) "  CC     $<"
+	$(Q)$(CC) -c $(ALL_CFLAGS) $< -o $@
+
+
+# Compile: create assembler files from C source files.
+$(OBJDIR)/%.s : %.c | $(OBJDIR) $(OBJDIR)/autoconf.h
+	$(CC) -S $(ALL_CFLAGS) $< -o $@
+
+
+# Assemble: create object files from assembler source files.
+$(OBJDIR)/%.o : %.S | $(OBJDIR) $(OBJDIR)/autoconf.h
+	$(E) "  AS     $<"
+	$(Q)$(CC) -c $(ALL_ASFLAGS) $< -o $@
+
+# Create preprocessed source for use in sending a bug report.
+$(OBJDIR)/%.i : %.c | $(OBJDIR) $(OBJDIR)/autoconf.h
+	$(CC) -E -mmcu=$(MCU) -I. $(CFLAGS) $< -o $@
+
+# Create the output directory
+$(OBJDIR):
+	$(E) "  MKDIR  $(OBJDIR)"
+	$(Q)mkdir $(OBJDIR)
+
+# Target: clean project.
+clean: begin clean_list end
+
+clean_list :
+	$(E) "  CLEAN"
+	$(Q)$(REMOVE) $(TARGET).hex
+	$(Q)$(REMOVE) $(TARGET).bin
+	$(Q)$(REMOVE) $(TARGET).eep
+	$(Q)$(REMOVE) $(TARGET).cof
+	$(Q)$(REMOVE) $(TARGET).elf
+	$(Q)$(REMOVE) $(TARGET).map
+	$(Q)$(REMOVE) $(TARGET).sym
+	$(Q)$(REMOVE) $(TARGET).lss
+	$(Q)$(REMOVE) $(OBJ)
+	$(Q)$(REMOVE) $(OBJDIR)/autoconf.h
+	$(Q)$(REMOVE) $(OBJDIR)/*.bin
+	$(Q)$(REMOVE) $(LST)
+	$(Q)$(REMOVE) $(CSRC:.c=.s)
+	$(Q)$(REMOVE) $(CSRC:.c=.d)
+	$(Q)$(REMOVE) .dep/*
+	$(Q)$(REMOVE) -rf codedoc
+	$(Q)$(REMOVE) -rf doxyinput
+	-$(Q)rmdir $(OBJDIR)
+
+# Include the dependency files.
+-include $(shell mkdir .dep 2>/dev/null) $(wildcard .dep/*)
+
+# Manual dependency for the assembler module
+# $(OBJDIR)/fastloader-ll.o: config.h $(OBJDIR)/autoconf.h
+
+# Listing of phony targets.
+.PHONY : all begin finish end sizebefore sizeafter gccversion \
+build elf hex eep lss sym coff extcoff \
+clean clean_list program debug gdb-config doxygen
+

mk1-src/avrcompat.h

@@ -0,0 +1,168 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+
+   This file was adapted from sd2iec, written by Ingo Korb, original
+   disclaimer follows: 
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   avrcompat.h: Compatibility defines for multiple target chips
+*/
+
+#ifndef AVRCOMPAT_H
+#define AVRCOMPAT_H
+
+/* USART */
+
+#if defined __AVR_ATmega644__ || defined __AVR_ATmega644P__ || defined __AVR_ATmega1281__ || defined __AVR_ATmega2561__
+
+#  ifdef USE_UART1
+#    define RXC   RXC1
+#    define RXEN  RXEN1
+#    define TXC   TXC1
+#    define TXEN  TXEN1
+#    define UBRRH UBRR1H
+#    define UBRRL UBRR1L
+#    define UCSRA UCSR1A
+#    define UCSRB UCSR1B
+#    define UCSRC UCSR1C
+#    define UCSZ0 UCSZ10
+#    define UCSZ1 UCSZ11
+#    define UDR   UDR1
+#    define UDRIE UDRIE1
+#    define RXCIE RXCIE1
+#    define USART_UDRE_vect USART1_UDRE_vect
+#    define USART_RX_vect   USART1_RX_vect
+#  else
+     /* Default is USART0 */
+#    define RXC   RXC0
+#    define RXEN  RXEN0
+#    define TXC   TXC0
+#    define TXEN  TXEN0
+#    define UBRRH UBRR0H
+#    define UBRRL UBRR0L
+#    define UCSRA UCSR0A
+#    define UCSRB UCSR0B
+#    define UCSRC UCSR0C
+#    define UCSZ0 UCSZ00
+#    define UCSZ1 UCSZ01
+#    define UDR   UDR0
+#    define UDRIE UDRIE0
+#    define RXCIE RXCIE0
+#    define USART_UDRE_vect USART0_UDRE_vect
+#    define USART_RX_vect   USART0_RX_vect
+#  endif
+
+#elif defined __AVR_ATmega48__ || defined __AVR_ATmega88__ || defined __AVR_ATmega168__
+/* These chips include the USART number in their register names, */
+/* but not in the ISR name. */
+#    define RXC   RXC0
+#    define RXEN  RXEN0
+#    define TXC   TXC0
+#    define TXEN  TXEN0
+#    define UBRRH UBRR0H
+#    define UBRRL UBRR0L
+#    define UCSRA UCSR0A
+#    define UCSRB UCSR0B
+#    define UCSRC UCSR0C
+#    define UCSZ0 UCSZ00
+#    define UCSZ1 UCSZ01
+#    define UDR   UDR0
+#    define UDRIE UDRIE0
+
+#elif defined __AVR_ATmega32__
+#  define TIMER2_COMPA_vect TIMER2_COMP_vect
+#  define TCCR0B TCCR0
+#  define TCCR2A TCCR2
+#  define TCCR2B TCCR2
+#  define TIFR0  TIFR
+#  define TIMSK2 TIMSK
+#  define OCIE2A OCIE2
+#  define OCR2A  OCR2
+
+#elif defined __AVR_ATmega128__
+#  define UBRRH  UBRR0H
+#  define UBRRL  UBRR0L
+#  define UCSRA  UCSR0A
+#  define UCSRB  UCSR0B
+#  define UCSRC  UCSR0C
+#  define UDR    UDR0
+#  define USART_UDRE_vect USART0_UDRE_vect
+#  define TIMER2_COMPA_vect TIMER2_COMP_vect
+#  define TCCR0B TCCR0
+#  define TCCR2A TCCR2
+#  define TCCR2B TCCR2
+#  define TIFR0  TIFR
+#  define TIMSK1 TIMSK
+#  define TIMSK2 TIMSK
+#  define OCIE2A OCIE2
+#  define OCR2A  OCR2
+
+#else
+#  error Unknown chip! (USART)
+#endif
+
+/* SPI and I2C */
+#if defined __AVR_ATmega32__ || defined __AVR_ATmega644__ || defined __AVR_ATmega644P__
+
+#  define SPI_PORT   PORTB
+#  define SPI_DDR    DDRB
+#  define SPI_SS     _BV(PB4)
+#  define SPI_MOSI   _BV(PB5)
+#  define SPI_MISO   _BV(PB6)
+#  define SPI_SCK    _BV(PB7)
+#  define HWI2C_PORT PORTC
+#  define HWI2C_SDA  _BV(PC1)
+#  define HWI2C_SCL  _BV(PC0)
+
+#elif defined __AVR_ATmega128__ || defined __AVR_ATmega1281__ || defined __AVR_ATmega2561__
+
+#  define SPI_PORT  PORTB
+#  define SPI_DDR   DDRB
+#  define SPI_SS    _BV(PB0)
+#  define SPI_SCK   _BV(PB1)
+#  define SPI_MOSI  _BV(PB2)
+#  define SPI_MISO  _BV(PB3)
+#  define HWI2C_PORT PORTD
+#  define HWI2C_SDA  _BV(PD1)
+#  define HWI2C_SCL  _BV(PD0)
+
+#elif defined __AVR_ATmega48__ || defined __AVR_ATmega88__ || defined __AVR_ATmega168__
+
+#  define SPI_PORT   PORTB
+#  define SPI_DDR    DDRB
+#  define SPI_SS     _BV(PB2)
+#  define SPI_SCK    _BV(PB5)
+#  define SPI_MOSI   _BV(PB3)
+#  define SPI_MISO   _BV(PB4)
+#  define HWI2C_PORT PORTC
+#  define HWI2C_SDA  _BV(PC4)
+#  define HWI2C_SCL  _BV(PC5)
+
+#else
+#  error Unknown chip! (SPI/TWI)
+#endif
+
+#define SPI_MASK (SPI_SS|SPI_MOSI|SPI_MISO|SPI_SCK)
+
+#endif /* AVRCOMPAT_H */

mk1-src/conf2h.awk

@@ -0,0 +1,29 @@
+#! /usr/bin/gawk -f
+
+# Trivial little script to convert from a makefile-style configuration
+# file to a C header. No copyright claimed.
+
+BEGIN {
+  print "// autoconf.h generated from " ARGV[1] " at " strftime() "\n" \
+    "#ifndef AUTOCONF_H\n" \
+    "#define AUTOCONF_H"
+}
+
+/^#/ { sub(/^#/,"//") }
+
+/^CONFIG_.*=/ {
+  if (/=n$/) {
+    sub(/^/,"// ");
+  } else {
+    sub(/^/,"#define ")
+    if (/=y$/) {
+      sub(/=.*$/,"")
+    } else {
+      sub(/=/," ")
+    }
+  }
+}
+
+{ print }
+
+END { print "#endif" }

mk1-src/config

@@ -0,0 +1,47 @@
+# This may not look like it, but it's a -*- makefile -*-
+# sd2snes - SD card based universal cartridge for the SNES
+# Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+#
+# This file was adapted from sd2iec, written by Ingo Korb.
+# Original disclaimer follows:
+#
+# sd2iec - SD/MMC to Commodore serial bus interface/controller
+# Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+#
+# Inspiration and low-level SD/MMC access based on code from MMC2IEC
+#   by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+#
+#  FAT filesystem access based on code from ChaN, see tff.c|h.
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; version 2 of the License only.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software
+#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+#
+# This file is included in the main sd2iec Makefile and also parsed
+# into autoconf.h.
+
+CONFIG_MCU=atmega644
+CONFIG_LINKER_RELAX=n
+CONFIG_MCU_FREQ=12288000
+CONFIG_BOOTLOADER=y
+CONFIG_BOOT_DEVID=0x4e534453
+CONFIG_UART_DEBUG=y
+CONFIG_UART_BAUDRATE=384000
+CONFIG_UART_BUF_SHIFT=7
+CONFIG_HARDWARE_NAME=sd2snes
+CONFIG_SD_AUTO_RETRIES=10
+#CONFIG_SD_DATACRC=y
+CONFIG_EEPROM_SIZE=512
+CONFIG_EEPROM_OFFSET=512
+CONFIG_MAX_PARTITIONS=1
+#CONFIG_DEADLOCK_ME_HARDER=y

mk1-src/config.h

@@ -0,0 +1,119 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/*
+   sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   config.h: User-configurable options to simplify hardware changes and/or
+             reduce the code/ram requirements of the code.
+
+
+   Based on MMC2IEC, original copyright header follows:
+
+//
+// Title        : MMC2IEC - Configuration
+// Author       : Lars Pontoppidan
+// Date         : Jan. 2007
+// Version      : 0.7
+// Target MCU   : AtMega32(L) at 8 MHz
+//
+//
+// DISCLAIMER:
+// The author is in no way responsible for any problems or damage caused by
+// using this code. Use at your own risk.
+//
+// LICENSE:
+// This code is distributed under the GNU Public License
+// which can be found at http://www.gnu.org/licenses/gpl.txt
+//
+
+*/
+
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include "autoconf.h"
+
+#  define HW_NAME "SD2IEC"
+#  define HAVE_SD
+#  define SDCARD_DETECT         (!(PIND & _BV(PD2)))
+#  define SDCARD_DETECT_SETUP() do { DDRD &= ~_BV(PD2); PORTD |= _BV(PD2); } while(0)
+#  if defined __AVR_ATmega32__
+#    define SD_CHANGE_SETUP()   do { MCUCR |= _BV(ISC00); GICR |= _BV(INT0); } while(0)
+#  elif defined __AVR_ATmega644__ || defined __AVR_ATmega644P__
+#    define SD_CHANGE_SETUP()   do { EICRA |= _BV(ISC00); EIMSK |= _BV(INT0); } while(0)
+#  else
+#    error Unknown chip!
+#  endif
+#  define SD_CHANGE_VECT        INT0_vect
+#  define SDCARD_WP  			(PINA & _BV(PA0))
+#  define SDCARD_WP_SETUP()     do { DDRA &= ~ _BV(PA0); PORTA |= _BV(PA0); } while(0)
+#  define SD_CHANGE_ICR         MCUCR
+#  define SD_SUPPLY_VOLTAGE     (1L<<21)
+#  define DEVICE_SELECT         (8+!(PINA & _BV(PA2))+2*!(PINA & _BV(PA3)))
+#  define DEVICE_SELECT_SETUP() do {        \
+             DDRA  &= ~(_BV(PA2)|_BV(PA3)); \
+             PORTA |=   _BV(PA2)|_BV(PA3);  \
+          } while (0)
+#  define BUSY_LED_SETDDR()     DDRA  |= _BV(PA0)
+#  define BUSY_LED_ON()         PORTA &= ~_BV(PA0)
+#  define BUSY_LED_OFF()        PORTA |= _BV(PA0)
+#  define DIRTY_LED_SETDDR()    DDRA  |= _BV(PA1)
+#  define DIRTY_LED_ON()        PORTA &= ~_BV(PA1)
+#  define DIRTY_LED_OFF()       PORTA |= _BV(PA1)
+#  define DIRTY_LED_PORT        PORTA
+#  define DIRTY_LED_BIT()       _BV(PA1)
+#  define AUX_LED_SETDDR()      do {} while (0)
+#  define AUX_LED_ON()          do {} while (0)
+#  define AUX_LED_OFF()         do {} while (0)
+#  define BUTTON_PIN            PINA
+#  define BUTTON_PORT           PORTA
+#  define BUTTON_DDR            DDRA
+#  define BUTTON_MASK           (_BV(PA4)|_BV(PA5))
+#  define BUTTON_NEXT           _BV(PA4)
+#  define BUTTON_PREV           _BV(PA5)
+
+/* An interrupt for detecting card changes implies hotplugging capability */
+#if defined(SD_CHANGE_VECT) || defined (CF_CHANGE_VECT)
+#  define HAVE_HOTPLUG
+#endif
+
+/* Generate dummy functions for the BUSY LED if required */
+#ifdef SINGLE_LED
+#  define BUSY_LED_SETDDR() do {} while(0)
+#  define BUSY_LED_ON()     do {} while(0)
+#  define BUSY_LED_OFF()    do {} while(0)
+#endif
+
+/* Create some temporary symbols so we can calculate the number of */
+/* enabled storage devices.                                        */
+#ifdef HAVE_SD
+#  define TMP_SD 1
+#endif
+
+/* Remove the temporary symbols */
+#undef TMP_SD
+
+#endif

mk1-src/crc16.c

@@ -0,0 +1,51 @@
+/**
+ * \file stdout
+ * Functions and types for CRC checks.
+ *
+ * Generated on Tue Jun 30 23:02:59 2009,
+ * by pycrc v0.7.1, http://www.tty1.net/pycrc/
+ * using the configuration:
+ *    Width        = 16
+ *    Poly         = 0x8005
+ *    XorIn        = 0x0000
+ *    ReflectIn    = True
+ *    XorOut       = 0x0000
+ *    ReflectOut   = True
+ *    Algorithm    = bit-by-bit-fast
+ *    Direct       = True
+ *****************************************************************************/
+#include <stdint.h>
+#include "crc16.h"
+/**
+ * Update the crc value with new data.
+ *
+ * \param crc      The current crc value.
+ * \param data     Pointer to a buffer of \a data_len bytes.
+ * \param data_len Number of bytes in the \a data buffer.
+ * \return         The updated crc value.
+ *****************************************************************************/
+crc_t crc16_update(crc_t crc, const unsigned char *data, size_t data_len)
+{
+    unsigned int i;
+    uint8_t bit;
+    unsigned char c;
+
+    while (data_len--) {
+        c = *data++;
+        for (i = 0x01; i & 0xff; i <<= 1) {
+            bit = (crc & 0x8000 ? 1 : 0);
+            if (c & i) {
+                bit ^= 1;
+            }
+            crc <<= 1;
+            if (bit) {
+                crc ^= 0x8005;
+            }
+        }
+        crc &= 0xffff;
+    }
+    return crc & 0xffff;
+}
+
+
+

mk1-src/crc16.h

@@ -0,0 +1,54 @@
+/**
+ * \file stdout
+ * Functions and types for CRC checks.
+ *
+ * Generated on Tue Jun 30 23:02:56 2009,
+ * by pycrc v0.7.1, http://www.tty1.net/pycrc/
+ * using the configuration:
+ *    Width        = 16
+ *    Poly         = 0x8005
+ *    XorIn        = 0x0000
+ *    ReflectIn    = True
+ *    XorOut       = 0x0000
+ *    ReflectOut   = True
+ *    Algorithm    = bit-by-bit-fast
+ *    Direct       = True
+ *****************************************************************************/
+#ifndef __STDOUT__
+#define __STDOUT__
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * The definition of the used algorithm.
+ *****************************************************************************/
+#define CRC_ALGO_BIT_BY_BIT_FAST 1
+
+/**
+ * The type of the CRC values.
+ *
+ * This type must be big enough to contain at least 16 bits.
+ *****************************************************************************/
+typedef uint16_t crc_t;
+
+/**
+ * Update the crc value with new data.
+ *
+ * \param crc      The current crc value.
+ * \param data     Pointer to a buffer of \a data_len bytes.
+ * \param data_len Number of bytes in the \a data buffer.
+ * \return         The updated crc value.
+ *****************************************************************************/
+crc_t crc16_update(crc_t crc, const unsigned char *data, size_t data_len);
+
+#ifdef __cplusplus
+}           /* closing brace for extern "C" */
+#endif
+
+#endif      /* __STDOUT__ */
+

mk1-src/crc32.c

@@ -0,0 +1,74 @@
+/**
+ * \file stdout
+ * Functions and types for CRC checks.
+ *
+ * Generated on Tue Jun 30 21:35:13 2009,
+ * by pycrc v0.7.1, http://www.tty1.net/pycrc/
+ * using the configuration:
+ *    Width        = 32
+ *    Poly         = 0x04c11db7
+ *    XorIn        = 0xffffffff
+ *    ReflectIn    = True
+ *    XorOut       = 0xffffffff
+ *    ReflectOut   = True
+ *    Algorithm    = bit-by-bit-fast
+ *    Direct       = True
+ *****************************************************************************/
+#include <stdint.h>
+#include "crc32.h"
+
+/**
+ * Reflect all bits of a \a data word of \a data_len bytes.
+ *
+ * \param data         The data word to be reflected.
+ * \param data_len     The width of \a data expressed in number of bits.
+ * \return     The reflected data.
+ *****************************************************************************/
+long crc_reflect(long data, size_t data_len)
+{
+    unsigned int i;
+    long ret;
+
+    ret = data & 0x01;
+    for (i = 1; i < data_len; i++)
+    {
+        data >>= 1;
+        ret = (ret << 1) | (data & 0x01);
+    }
+    return ret;
+}
+
+
+/**
+ * Update the crc value with new data.
+ *
+ * \param crc      The current crc value.
+ * \param data     Pointer to a buffer of \a data_len bytes.
+ * \param data_len Number of bytes in the \a data buffer.
+ * \return         The updated crc value.
+ *****************************************************************************/
+crc_t crc_update(crc_t crc, const unsigned char *data, size_t data_len)
+{
+    unsigned int i;
+    uint8_t bit;
+    unsigned char c;
+
+    while (data_len--) {
+        c = *data++;
+        for (i = 0x01; i & 0xff; i <<= 1) {
+            bit = ((crc & 0x80000000) ? 1 : 0);
+            if (c & i) {
+                bit ^= 1;
+            }
+            crc <<= 1;
+            if (bit) {
+                crc ^= 0x04c11db7;
+            }
+        }
+        crc &= 0xffffffff;
+    }
+    return crc & 0xffffffff;
+}
+
+
+

mk1-src/crc32.h

@@ -0,0 +1,85 @@
+/**
+ * \file stdout
+ * Functions and types for CRC checks.
+ *
+ * Generated on Tue Jun 30 21:35:19 2009,
+ * by pycrc v0.7.1, http://www.tty1.net/pycrc/
+ * using the configuration:
+ *    Width        = 32
+ *    Poly         = 0x04c11db7
+ *    XorIn        = 0xffffffff
+ *    ReflectIn    = True
+ *    XorOut       = 0xffffffff
+ *    ReflectOut   = True
+ *    Algorithm    = bit-by-bit-fast
+ *    Direct       = True
+ *****************************************************************************/
+#ifndef __STDOUT__
+#define __STDOUT__
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * The definition of the used algorithm.
+ *****************************************************************************/
+#define CRC_ALGO_BIT_BY_BIT_FAST 1
+
+/**
+ * The type of the CRC values.
+ *
+ * This type must be big enough to contain at least 32 bits.
+ *****************************************************************************/
+typedef uint32_t crc_t;
+
+/**
+ * Reflect all bits of a \a data word of \a data_len bytes.
+ *
+ * \param data         The data word to be reflected.
+ * \param data_len     The width of \a data expressed in number of bits.
+ * \return     The reflected data.
+ *****************************************************************************/
+long crc_reflect(long data, size_t data_len);
+
+/**
+ * Calculate the initial crc value.
+ *
+ * \return     The initial crc value.
+ *****************************************************************************/
+static inline crc_t crc_init(void)
+{
+    return 0xffffffff;
+}
+
+/**
+ * Update the crc value with new data.
+ *
+ * \param crc      The current crc value.
+ * \param data     Pointer to a buffer of \a data_len bytes.
+ * \param data_len Number of bytes in the \a data buffer.
+ * \return         The updated crc value.
+ *****************************************************************************/
+crc_t crc_update(crc_t crc, const unsigned char *data, size_t data_len);
+
+/**
+ * Calculate the final crc value.
+ *
+ * \param crc  The current crc value.
+ * \return     The final crc value.
+ *****************************************************************************/
+static inline crc_t crc_finalize(crc_t crc)
+{
+    return crc_reflect(crc, 32) ^ 0xffffffff;
+}
+
+
+#ifdef __cplusplus
+}           /* closing brace for extern "C" */
+#endif
+
+#endif      /* __STDOUT__ */
+

mk1-src/crc7.c

@@ -0,0 +1,107 @@
+/* This file is a modified version of the output of pycrc.
+ *
+ * Licensing terms of pycrc:
+ *
+ *   Copyright (c) 2006-2007, Thomas Pircher <tehpeh@gmx.net>
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ *
+ * crc7.c: Calculate CRC7 for SD card commands
+ *
+ */
+
+/*
+ * Functions and types for CRC checks.
+ *
+ * Generated on Thu Nov  8 13:52:05 2007,
+ * by pycrc v0.6.3, http://www.tty1.net/pycrc/
+ * using the configuration:
+ *    Width        = 7
+ *    Poly         = 0x09
+ *    XorIn        = 0x00
+ *    ReflectIn    = False
+ *    XorOut       = 0x00
+ *    ReflectOut   = False
+ *    Algorithm    = bit-by-bit-fast
+ */
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+/**
+; MMC/SD CRC Polynom X^7 + X^3 + 1
+crc7taba:
+        mov     dptr,#CRC7_TABA  ; (2)
+  clr  c    ; (1)
+  rrc  a    ; (1)
+  xrl  a,crc7ta  ; (1)
+        movc    a,@a+dptr  ; (2)
+  jnc  crc7m    ; (2)
+  xrl  a,#00001001b  ; (1)
+crc7m:  mov  crc7ta,a  ; (1)
+  ret      ; (2) (LCALL=2)
+*/
+uint8_t crc7tab[128] = {
+   0x00,0x12,0x24,0x36,0x48,0x5a,0x6c,0x7e,
+   0x19,0x0b,0x3d,0x2f,0x51,0x43,0x75,0x67,
+   0x32,0x20,0x16,0x04,0x7a,0x68,0x5e,0x4c,
+   0x2b,0x39,0x0f,0x1d,0x63,0x71,0x47,0x55,
+   0x64,0x76,0x40,0x52,0x2c,0x3e,0x08,0x1a,
+   0x7d,0x6f,0x59,0x4b,0x35,0x27,0x11,0x03,
+   0x56,0x44,0x72,0x60,0x1e,0x0c,0x3a,0x28,
+   0x4f,0x5d,0x6b,0x79,0x07,0x15,0x23,0x31,
+   0x41,0x53,0x65,0x77,0x09,0x1b,0x2d,0x3f,
+   0x58,0x4a,0x7c,0x6e,0x10,0x02,0x34,0x26,
+   0x73,0x61,0x57,0x45,0x3b,0x29,0x1f,0x0d,
+   0x6a,0x78,0x4e,0x5c,0x22,0x30,0x06,0x14,
+   0x25,0x37,0x01,0x13,0x6d,0x7f,0x49,0x5b,
+   0x3c,0x2e,0x18,0x0a,0x74,0x66,0x50,0x42,
+   0x17,0x05,0x33,0x21,0x5f,0x4d,0x7b,0x69,
+   0x0e,0x1c,0x2a,0x38,0x46,0x54,0x62,0x70
+};
+
+uint8_t crc7update(uint8_t crc, const uint8_t data) {
+	uint8_t a = data;
+	uint8_t b = data & 1;
+	a = crc7tab[(a>>1) ^ crc];
+	a ^= ((b<<3)|(b));
+    crc = a;
+	return a;	
+}
+
+/*uint8_t crc7update(uint8_t crc, const uint8_t data) {
+    uint8_t i;
+    bool bit;
+    uint8_t c;
+
+    c = data;
+    for (i = 0x80; i > 0; i >>= 1) {
+      bit = crc & 0x40;
+      if (c & i) {
+        bit = !bit;
+      }
+      crc <<= 1;
+      if (bit) {
+        crc ^= 0x09;
+      }
+    }
+    crc &= 0x7f;
+    return crc & 0x7f;
+}*/

mk1-src/crc7.h

@@ -0,0 +1,33 @@
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   crc7.h: Definitions for CRC7 calculation routines
+
+*/
+
+#ifndef CRC7_H
+#define CRC7_H
+
+uint8_t crc7update(uint8_t crc, const uint8_t data);
+
+#endif
+

mk1-src/crcgen-new.c

@@ -0,0 +1,85 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <inttypes.h>
+#include <string.h>
+
+#define lo8(x) (x & 0xFF)
+#define hi8(x) ((x >> 8) & 0xFF)
+#define xhi8(x) ((x >> 16) & 0xff)
+#define xxhi8(x) ((x >> 24) & 0xff)
+
+unsigned short crc_ccitt_update (uint16_t crc, uint8_t data)
+{
+  data ^= lo8 (crc);
+  data ^= data << 4;
+  return ((((uint16_t)data << 8) | hi8 (crc)) ^ (uint8_t)(data >> 4) ^ ((uint16_t)data << 3));
+}	
+
+int main(int argc, char *argv[]) {
+  if (argc != 5) {
+    printf("Usage: crcgen <filename> <length> <signature> <version>\r\n");
+    return 1;
+  }
+
+  unsigned long length  = strtol(argv[2],NULL,0);
+  unsigned long devid   = strtol(argv[3],NULL,0);
+  unsigned long version = strtol(argv[4],NULL,0);
+
+  if (length > length+8) {
+    printf("Ha ha, very funny.\n");
+    return 1;
+  }
+
+  uint8_t *data = malloc(length+8);
+
+  if (!data) {
+    perror("malloc");
+    return 1;
+  }
+
+  memset(data, 0xff, length);
+  
+  FILE *f;
+  
+  f = fopen(argv[1], "rb+");
+  
+  if (f == 0) {
+    printf("Unable to open file %s\r\n", argv[1]);
+    return 1;
+  }
+  
+  fread(data, 1, length, f);
+
+  data[length-8] = lo8(devid);
+  data[length-7] = hi8(devid);
+  data[length-6] = xhi8(devid);
+  data[length-5] = xxhi8(devid);
+  data[length-4] = lo8(version);
+  data[length-3] = hi8(version);
+
+  unsigned long l;
+  unsigned short crc = 0xFFFF;
+  
+  for (l=0; l < length-2; l++)
+    crc = crc_ccitt_update(crc, data[l]);
+  
+  data[length-2] = lo8(crc);
+  data[length-1] = hi8(crc);
+
+  if (fseek(f, 0, SEEK_SET)) {
+    perror("fseek");
+    return 1;
+  }
+
+  if (fwrite(data, length, 1, f) != 1) {
+    perror("fwrite");
+    return 1;
+  }
+  
+  fclose(f);
+  
+  return 0;
+}
+

mk1-src/diskio.c

@@ -0,0 +1,202 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   diskio.c: Generic disk access routines and supporting stuff
+
+*/
+
+#include "config.h"
+#include "diskio.h"
+#include "sdcard.h"
+
+volatile enum diskstates disk_state;
+
+#ifdef NEED_DISKMUX
+
+uint32_t drive_config;
+
+/* This function calculates the default drive configuration. */
+/* Its result is static after compilation, but doing this in */
+/* C in less messy than doing it with the preprocessor.      */
+uint32_t get_default_driveconfig(void) {
+  uint32_t result = 0xffffffffL;
+
+  /* Order matters: Whatever is checked first will be last in the config */
+#ifdef HAVE_DF
+  result = (result << 4) + (DISK_TYPE_DF  << DRIVE_BITS) + 0;
+#endif
+#ifdef CONFIG_TWINSD
+  result = (result << 4) + (DISK_TYPE_SD  << DRIVE_BITS) + 1;
+#endif
+#ifdef HAVE_SD
+  result = (result << 4) + (DISK_TYPE_SD  << DRIVE_BITS) + 0;
+#endif
+#ifdef HAVE_ATA
+  result = (result << 4) + (DISK_TYPE_ATA << DRIVE_BITS) + 0;
+#endif
+  return result;
+}
+
+void disk_init(void) {
+#ifdef HAVE_SD
+  sd_init();
+#endif
+#ifdef HAVE_ATA
+  ata_init();
+#endif
+#ifdef HAVE_DF
+  df_init();
+#endif
+}
+
+DSTATUS disk_status(BYTE drv) {
+  switch(drv >> DRIVE_BITS) {
+#ifdef HAVE_DF
+  case DISK_TYPE_DF:
+    return df_status(drv & DRIVE_MASK);
+#endif
+
+#ifdef HAVE_ATA
+  case DISK_TYPE_ATA:
+    return ata_status(drv & DRIVE_MASK);
+
+  case DISK_TYPE_ATA2:
+    return ata_status((drv & DRIVE_MASK) + 2);
+#endif
+
+#ifdef HAVE_SD
+  case DISK_TYPE_SD:
+    return sd_status(drv & DRIVE_MASK);
+#endif
+
+  default:
+    return STA_NOINIT|STA_NODISK;
+  }
+}
+
+DSTATUS disk_initialize(BYTE drv) {
+  switch(drv >> DRIVE_BITS) {
+#ifdef HAVE_DF
+  case DISK_TYPE_DF:
+    return df_initialize(drv & DRIVE_MASK);
+#endif
+
+#ifdef HAVE_ATA
+  case DISK_TYPE_ATA:
+    return ata_initialize(drv & DRIVE_MASK);
+
+  case DISK_TYPE_ATA2:
+    return ata_initialize((drv & DRIVE_MASK) + 2);
+#endif
+
+#ifdef HAVE_SD
+  case DISK_TYPE_SD:
+    return sd_initialize(drv & DRIVE_MASK);
+#endif
+
+  default:
+    return STA_NOINIT|STA_NODISK;
+  }
+}
+
+DRESULT disk_read(BYTE drv, BYTE *buffer, DWORD sector, BYTE count) {
+  switch(drv >> DRIVE_BITS) {
+#ifdef HAVE_DF
+  case DISK_TYPE_DF:
+    return df_read(drv & DRIVE_MASK,buffer,sector,count);
+#endif
+
+#ifdef HAVE_ATA
+  case DISK_TYPE_ATA:
+    return ata_read(drv & DRIVE_MASK,buffer,sector,count);
+
+  case DISK_TYPE_ATA2:
+    return ata_read((drv & DRIVE_MASK) + 2,buffer,sector,count);
+#endif
+
+#ifdef HAVE_SD
+  case DISK_TYPE_SD:
+    return sd_read(drv & DRIVE_MASK,buffer,sector,count);
+#endif
+
+  default:
+    return RES_ERROR;
+  }
+}
+
+DRESULT disk_write(BYTE drv, const BYTE *buffer, DWORD sector, BYTE count) {
+  switch(drv >> DRIVE_BITS) {
+#ifdef HAVE_DF
+  case DISK_TYPE_DF:
+    return df_write(drv & DRIVE_MASK,buffer,sector,count);
+#endif
+
+#ifdef HAVE_ATA
+  case DISK_TYPE_ATA:
+    return ata_write(drv & DRIVE_MASK,buffer,sector,count);
+
+  case DISK_TYPE_ATA2:
+    return ata_write((drv & DRIVE_MASK) + 2,buffer,sector,count);
+#endif
+
+#ifdef HAVE_SD
+  case DISK_TYPE_SD:
+    return sd_write(drv & DRIVE_MASK,buffer,sector,count);
+#endif
+
+  default:
+    return RES_ERROR;
+  }
+}
+
+DRESULT disk_getinfo(BYTE drv, BYTE page, void *buffer) {
+  switch(drv >> DRIVE_BITS) {
+#ifdef HAVE_DF
+  case DISK_TYPE_DF:
+    return df_getinfo(drv & DRIVE_MASK,page,buffer);
+#endif
+
+#ifdef HAVE_ATA
+  case DISK_TYPE_ATA:
+    return ata_getinfo(drv & DRIVE_MASK,page,buffer);
+
+  case DISK_TYPE_ATA2:
+    return ata_getinfo((drv & DRIVE_MASK) + 2,page,buffer);
+#endif
+
+#ifdef HAVE_SD
+  case DISK_TYPE_SD:
+    return sd_getinfo(drv & DRIVE_MASK,page,buffer);
+#endif
+
+  default:
+    return RES_ERROR;
+  }
+}
+
+
+#endif

mk1-src/diskio.h

@@ -0,0 +1,132 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   diskio.h: Definitions for the disk access routines
+
+   Based on diskio.h from FatFS by ChaN, see ff.c for
+   for full copyright details.
+
+*/
+
+#ifndef DISKIO_H
+#define DISKIO_H
+
+#include "integer.h"
+
+/* Status of Disk Functions */
+typedef BYTE    DSTATUS;
+
+/* Disk Status Bits (DSTATUS) */
+#define STA_NOINIT              0x01    /* Drive not initialized */
+#define STA_NODISK              0x02    /* No medium in the drive */
+#define STA_PROTECT             0x04    /* Write protected */
+
+/* Results of Disk Functions */
+typedef enum {
+        RES_OK = 0,             /* 0: Successful */
+        RES_ERROR,              /* 1: R/W Error */
+        RES_WRPRT,              /* 2: Write Protected */
+        RES_NOTRDY,             /* 3: Not Ready */
+        RES_PARERR              /* 4: Invalid Parameter */
+} DRESULT;
+
+/**
+ * struct diskinfo0_t - disk info data structure for page 0
+ * @validbytes : Number of valid bytes in this struct
+ * @maxpage    : Highest diskinfo page supported
+ * @disktype   : type of the disk (DISK_TYPE_* values)
+ * @sectorsize : sector size divided by 256
+ * @sectorcount: number of sectors on the disk
+ *
+ * This is the struct returned in the data buffer when disk_getinfo
+ * is called with page=0.
+ */
+typedef struct {
+  uint8_t  validbytes;
+  uint8_t  maxpage;
+  uint8_t  disktype;
+  uint8_t  sectorsize;   /* divided by 256 */
+  uint32_t sectorcount;  /* 2 TB should be enough... (512 byte sectors) */
+} diskinfo0_t;
+
+/*---------------------------------------*/
+/* Prototypes for disk control functions */
+
+DSTATUS disk_initialize (BYTE);
+DSTATUS disk_status (BYTE);
+DRESULT disk_read (BYTE, BYTE*, DWORD, BYTE);
+DRESULT disk_write (BYTE, const BYTE*, DWORD, BYTE);
+#define disk_ioctl(a,b,c) RES_OK
+DRESULT disk_getinfo(BYTE drv, BYTE page, void *buffer);
+
+void disk_init(void);
+
+uint8_t SD_SPI_OFFLOAD;
+
+/* Will be set to DISK_ERROR if any access on the card fails */
+enum diskstates { DISK_CHANGED = 0, DISK_REMOVED, DISK_OK, DISK_ERROR };
+
+extern volatile enum diskstates disk_state;
+
+/* Disk type - part of the external API except for ATA2! */
+#define DISK_TYPE_ATA        0
+#define DISK_TYPE_ATA2       1
+#define DISK_TYPE_SD         2
+#define DISK_TYPE_DF         3
+#define DISK_TYPE_NONE       7
+
+#ifdef NEED_DISKMUX
+
+/* Disk mux configuration */
+
+extern uint32_t drive_config;
+
+uint32_t get_default_driveconfig(void);
+
+#  define set_map_drive(drv,val) (drive_config = \
+      (drive_config & (0xffffffff - (0x0f << (drv * 4)))) \
+                    | (val << (drv * 4)))
+#  define map_drive(drv) ((drive_config >> (4 * drv)) & 0x0f)
+#  define set_drive_config(config)  drive_config = config
+
+/* Number of bits used for the drive, the disk type */
+/* uses the remainder (4 bits per entry).           */
+#  define DRIVE_BITS           1
+
+/* Calculate mask from the shift value */
+#  define DRIVE_MASK           ((1 << DRIVE_BITS)-1)
+
+#else // NEED_DISKMUX
+
+#  define set_map_drive(drv,val) do {} while(0)
+#  define map_drive(drv) (drv)
+#  define set_drive_config(conf) do {} while(0)
+#  define get_default_driveconfig() 0
+
+#endif // NEED_DISKMUX
+
+#endif

mk1-src/eeprom.c

@@ -0,0 +1,175 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   eeprom.c: Persistent configuration storage
+
+*/
+
+#include <avr/eeprom.h>
+#include <avr/io.h>
+#include "config.h"
+#include "diskio.h"
+#include "fatops.h"
+#include "flags.h"
+#include "iec.h"
+#include "timer.h"
+#include "eeprom.h"
+
+#include "uart.h"
+
+/**
+ * struct storedconfig - in-eeprom data structure
+ * @dummy      : EEPROM position 0 is unused
+ * @checksum   : Checksum over the EEPROM contents
+ * @structsize : size of the eeprom structure
+ * @osccal     : stored value of OSCCAL
+ * @globalflags: subset of the globalflags variable
+ * @address    : device address set by software
+ * @hardaddress: device address set by jumpers
+ * @fileexts   : file extension mapping mode
+ * @drvflags0  : 16 bits of drv mappings, organized as 4 nybbles.
+ * @drvflags1  : 16 bits of drv mappings, organized as 4 nybbles.
+ *
+ * This is the data structure for the contents of the EEPROM.
+ */
+static EEMEM struct {
+  uint8_t  dummy;
+  uint8_t  checksum;
+  uint16_t structsize;
+  uint8_t  osccal;
+  uint8_t  global_flags;
+  uint8_t  address;
+  uint8_t  hardaddress;
+  uint8_t  fileexts;
+  uint16_t drvconfig0;
+  uint16_t drvconfig1;
+} storedconfig;
+
+/**
+ * read_configuration - reads configuration from EEPROM
+ *
+ * This function reads the stored configuration values from the EEPROM.
+ * If the stored checksum doesn't match the calculated one nothing will
+ * be changed.
+ */
+void read_configuration(void) {
+  uint16_t i,size;
+  uint8_t checksum, tmp;
+
+  /* Set default values */
+  globalflags         |= JIFFY_ENABLED;        /* JiffyDos enabled */
+  globalflags         |= POSTMATCH;            /* Post-* matching enabled */
+  globalflags         |= FAT32_FREEBLOCKS;     /* Calculate the number of free blocks on FAT32 */
+  file_extension_mode  = 1;                    /* Store x00 extensions except for PRG */
+  set_drive_config(get_default_driveconfig()); /* Set the default drive configuration */
+
+  /* Use the NEXT button to skip reading the EEPROM configuration */
+  if (!(BUTTON_PIN & BUTTON_NEXT)) {
+    ignore_keys();
+    return;
+  }
+
+  size = eeprom_read_word(&storedconfig.structsize);
+
+  /* Calculate checksum of EEPROM contents */
+  checksum = 0;
+  for (i=2; i<size; i++)
+    checksum += eeprom_read_byte((uint8_t *)i);
+
+  /* Abort if the checksum doesn't match */
+  if (checksum != eeprom_read_byte(&storedconfig.checksum)) {
+    EEAR = 0;
+    return;
+  }
+
+  /* Read data from EEPROM */
+  OSCCAL = eeprom_read_byte(&storedconfig.osccal);
+
+  tmp = eeprom_read_byte(&storedconfig.global_flags);
+  globalflags &= (uint8_t)~(JIFFY_ENABLED | POSTMATCH |
+                            EXTENSION_HIDING | FAT32_FREEBLOCKS);
+  globalflags |= tmp;
+
+  if (eeprom_read_byte(&storedconfig.hardaddress) == DEVICE_SELECT)
+    device_address = eeprom_read_byte(&storedconfig.address);
+
+  file_extension_mode = eeprom_read_byte(&storedconfig.fileexts);
+
+#ifdef NEED_DISKMUX
+  if (size > 9) {
+    uint32_t tmpconfig;
+    tmpconfig = eeprom_read_word(&storedconfig.drvconfig0);
+    tmpconfig |= (uint32_t)eeprom_read_word(&storedconfig.drvconfig1) << 16;
+    set_drive_config(tmpconfig);
+  }
+
+  /* sanity check.  If the user has truly turned off all drives, turn the
+   * defaults back on
+   */
+  if(drive_config == 0xffffffff)
+    set_drive_config(get_default_driveconfig());
+#endif
+
+  /* Paranoia: Set EEPROM address register to the dummy entry */
+  EEAR = 0;
+}
+
+/**
+ * write_configuration - stores configuration data to EEPROM
+ *
+ * This function stores the current configuration values to the EEPROM.
+ */
+void write_configuration(void) {
+  uint16_t i;
+  uint8_t checksum;
+
+  /* Write configuration to EEPROM */
+  eeprom_write_word(&storedconfig.structsize, sizeof(storedconfig));
+  eeprom_write_byte(&storedconfig.osccal, OSCCAL);
+  eeprom_write_byte(&storedconfig.global_flags,
+                    globalflags & (JIFFY_ENABLED | POSTMATCH |
+                                   EXTENSION_HIDING | FAT32_FREEBLOCKS));
+  eeprom_write_byte(&storedconfig.address, device_address);
+  eeprom_write_byte(&storedconfig.hardaddress, DEVICE_SELECT);
+  eeprom_write_byte(&storedconfig.fileexts, file_extension_mode);
+#ifdef NEED_DISKMUX
+  eeprom_write_word(&storedconfig.drvconfig0, drive_config);
+  eeprom_write_word(&storedconfig.drvconfig1, drive_config >> 16);
+#endif
+
+  /* Calculate checksum over EEPROM contents */
+  checksum = 0;
+  for (i=2;i<sizeof(storedconfig);i++)
+    checksum += eeprom_read_byte((uint8_t *) i);
+
+  /* Store checksum to EEPROM */
+  eeprom_write_byte(&storedconfig.checksum, checksum);
+
+  /* Paranoia: Set EEPROM address register to the dummy entry */
+  EEAR = 0;
+}
+

mk1-src/eeprom.h

@@ -0,0 +1,38 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   eeprom.h: Persistent configuration storage
+
+*/
+
+#ifndef EEPROM_H
+#define EEPROM_H
+
+void read_configuration(void);
+void write_configuration(void);
+
+#endif

mk1-src/ff.h

@@ -0,0 +1,448 @@
+/*--------------------------------------------------------------------------/
+/  FatFs - FAT file system module include file  R0.06        (C)ChaN, 2008
+/---------------------------------------------------------------------------/
+/ FatFs module is an experimenal project to implement FAT file system to
+/ cheap microcontrollers. This is a free software and is opened for education,
+/ research and development under license policy of following trems.
+/
+/  Copyright (C) 2008, ChaN, all right reserved.
+/
+/ * The FatFs module is a free software and there is no warranty.
+/ * You can use, modify and/or redistribute it for personal, non-profit or
+/ * commercial use without any restriction under your responsibility.
+/ * Redistributions of source code must retain the above copyright notice.
+/
+/---------------------------------------------------------------------------*/
+
+#ifndef _FATFS
+
+#define _MCU_ENDIAN     1
+/* The _MCU_ENDIAN defines which access method is used to the FAT structure.
+/  1: Enable word access.
+/  2: Disable word access and use byte-by-byte access instead.
+/  When the architectural byte order of the MCU is big-endian and/or address
+/  miss-aligned access results incorrect behavior, the _MCU_ENDIAN must be set
+/  to 2. If it is not the case, it can be set to 1 for good code efficiency. */
+
+#define _FS_READONLY    0
+/* Setting _FS_READONLY to 1 defines read only configuration. This removes
+/  writing functions, f_write, f_sync, f_unlink, f_mkdir, f_chmod, f_rename,
+/  f_truncate and useless f_getfree. */
+
+#define _FS_MINIMIZE    0
+/* The _FS_MINIMIZE option defines minimization level to remove some functions.
+/  0: Full function.
+/  1: f_stat, f_getfree, f_unlink, f_mkdir, f_chmod, f_truncate and f_rename are removed.
+/  2: f_opendir and f_readdir are removed in addition to level 1.
+/  3: f_lseek is removed in addition to level 2. */
+
+#define _USE_STRFUNC    0
+/* To enable string functions, set _USE_STRFUNC to 1 or 2. */
+
+#define _DRIVES     1 
+/*MAX_DRIVES*/
+/* Number of physical drives to be used. This affects the size of internal
+ * table. (when using _USE_DRIVE_PREFIX */
+
+#define _USE_MKFS   0
+/* When _USE_MKFS is set to 1 and _FS_READONLY is set to 0, f_mkfs function is
+/  enabled. */
+
+#define _MULTI_PARTITION    0
+/* When _MULTI_PARTITION is set to 0, each logical drive is bound to the same
+/  physical drive number and can mount only 1st primary partition.
+/
+/  When it is set to 1, the low _PARTITION_MASK bits of each partition represent
+/  the partition and the high (8-_PARTITION_MASK) bits represent the physical
+/  drive */
+
+#define _PARTITION_MASK     4
+
+#define _USE_FSINFO 1
+/* To enable FSInfo support on FAT32 volume, set _USE_FSINFO to 1. */
+
+#define _USE_SJIS   0
+/* When _USE_SJIS is set to 1, Shift-JIS code transparency is enabled, otherwise
+/  only US-ASCII(7bit) code can be accepted as file/directory name. */
+
+#define _USE_NTFLAG 0
+/* When _USE_NTFLAG is set to 1, upper/lower case of the file name is preserved.
+/  Note that the files are always accessed in case insensitive. */
+
+#define _USE_CHDIR 0
+
+#define _USE_CURR_DIR 1
+
+#define _USE_LFN 1
+
+/* Maximum number of characters to return for a LFN */
+/* The buffer used for FILINFO.lfn must be at least */
+/* _MAX_LFN_LENGTH+1 characters long!               */
+/* Note that if _USE_LFN_DBCS is set, this value    */
+/* represents the characters needed, not bytes      */
+#define _MAX_LFN_LENGTH 255
+
+/* When _USE_LFN_DBCS is set to 1, FILINFO.lfn will contain a DBCS string, not
+/  a simple ASCII string  */
+#define _USE_LFN_DBCS 0
+
+/* When set to 1, All FIL objects will use the buffer.  This reduces memory
+/  requirements as open files will only require space for a FIL object, but
+/  operate slower. When set, ff.c will behave like tff.c, but will allow
+/  multiple filesystems.  */
+#define _USE_FS_BUF 1
+
+/* When set to 1, All objects will use a static  buffer.  This reduces memory
+/  requirements to the absolute minimum ~512 bytes for the buffer, but will
+/  operate slower.  This option can only be set if _USE_FS_BUF is set.  */
+#define _USE_1_BUF 1
+
+/* If set to 1, FatFs will manage the FATFS structures after mounting.  If
+/  set to 0, the caller must send the correct drive FATFS structure for each
+/  call.  Normally, this should be set to 1, but if the caller wants to use
+/  low level l_* functions or skip sending the drive number in the path string,
+/  this must be turned off.  */
+#define _USE_DRIVE_PREFIX 1
+
+/* If set to 1, FatFS will delay mounting the drive until first use.  Normally,
+/  this should be turned on.  However, it cannot be used with
+/  _USE_DRIVE_PREFIX = 0  */
+#define _USE_DEFERRED_MOUNT 0
+
+/* New features in 0.05a, not required yet */
+#define _USE_TRUNCATE 0
+#define _USE_UTIME   0
+
+#include "integer.h"
+
+#if _USE_LFN_DBCS != 0
+#define S_LFN_OFFSET 26
+#define S_LFN_INCREMENT 2
+#else
+#define S_LFN_OFFSET 13
+#define S_LFN_INCREMENT 1
+#endif
+
+/* Definitions corresponds to multiple sector size (not tested) */
+#define S_MAX_SIZ   512U            /* Do not change */
+#if S_MAX_SIZ > 512U
+#define SS(fs)  ((fs)->s_size)
+#else
+#define SS(fs)  512U
+#endif
+
+#if _USE_1_BUF == 1 && _USE_FS_BUF == 0
+#error You can only use 1_BUF with _USE_FS_BUF at present
+#define _USE_1_BUF 0
+#endif
+
+typedef struct _BUF {
+  DWORD sect;
+  BYTE  dirty;              /* dirty flag (1:must be written back) */
+//BYTE  pad1;
+#if _USE_1_BUF != 0
+  struct _FATFS *fs;
+#endif
+  BYTE  data[S_MAX_SIZ];    /* Disk access window for Directory/FAT */
+} BUF;
+
+/* File system object structure */
+typedef struct _FATFS {
+  //WORD    id;             /* File system mount ID */
+    WORD    n_rootdir;      /* Number of root directory entries */
+    DWORD   sects_fat;      /* Sectors per fat */
+    DWORD   max_clust;      /* Maximum cluster# + 1 */
+    DWORD   fatbase;        /* FAT start sector */
+    DWORD   dirbase;        /* Root directory start sector (cluster# for FAT32) */
+    DWORD   database;       /* Data start sector */
+#if _USE_CHDIR != 0 || _USE_CURR_DIR != 0
+    DWORD curr_dir;
+#endif
+#if !_FS_READONLY
+    DWORD   last_clust;     /* Last allocated cluster */
+    DWORD   free_clust;     /* Number of free clusters */
+#if _USE_FSINFO
+    DWORD   fsi_sector;     /* fsinfo sector */
+    BYTE    fsi_flag;       /* fsinfo dirty flag (1:must be written back) */
+  //BYTE    pad2;
+#endif
+#endif
+    BYTE    fs_type;        /* FAT sub type */
+    BYTE    csize;          /* Number of sectors per cluster */
+#if S_MAX_SIZ > 512U
+    WORD    s_size;         /* Sector size */
+#endif
+    BYTE    n_fats;         /* Number of FAT copies */
+    BYTE    drive;          /* Physical drive number */
+#if _USE_1_BUF == 0
+    BUF   buf;
+#endif
+} FATFS;
+
+/* Directory object structure */
+typedef struct _DIR {
+  //WORD    id;         /* Owner file system mount ID */
+    WORD    index;      /* Current index */
+    FATFS*  fs;         /* Pointer to the owner file system object */
+    DWORD   sclust;     /* Start cluster */
+    DWORD   clust;      /* Current cluster */
+    DWORD   sect;       /* Current sector */
+} DIR;
+
+
+/* File object structure */
+typedef struct _FIL {
+  //WORD    id;             /* Owner file system mount ID */
+    BYTE    flag;           /* File status flags */
+    BYTE    csect;          /* Sector address in the cluster */
+    FATFS*  fs;             /* Pointer to the owner file system object */
+    DWORD   fptr;           /* File R/W pointer */
+    DWORD   fsize;          /* File size */
+    DWORD   org_clust;      /* File start cluster */
+    DWORD   curr_clust;     /* Current cluster */
+    DWORD   curr_sect;      /* Current sector */
+#if _FS_READONLY == 0
+    DWORD   dir_sect;       /* Sector containing the directory entry */
+    BYTE*   dir_ptr;        /* Ponter to the directory entry in the window */
+#endif
+#if _USE_LESS_BUF == 0 && _USE_1_BUF == 0
+    BUF   buf;              /* File R/W buffer */
+#endif
+} FIL;
+
+
+/* File status structure */
+typedef struct _FILINFO {
+    DWORD fsize;            /* Size */
+    WORD fdate;             /* Date */
+    WORD ftime;             /* Time */
+    BYTE fattrib;           /* Attribute */
+    DWORD clust;            /* Start cluster */
+    UCHAR fname[8+1+3+1];   /* Name (8.3 format) */
+#if _USE_LFN != 0
+    UCHAR* lfn;
+#endif
+} FILINFO;
+
+
+
+/* Definitions corresponds to multi partition */
+
+#if _MULTI_PARTITION != 0   /* Multiple partition cfg */
+
+#define LD2PD(drv) (drv >> (8-_PARTITION_MASK))       /* Get physical drive# */
+#define LD2PT(drv) (drv & ((1<<_PARTITION_MASK)-1))   /* Get partition# */
+#define _LOGICAL_DRIVES (_DRIVES * (1<<_PARTITION_MASK))
+
+#else                               /* Single partition cfg */
+
+#define LD2PD(drv) (drv)            /* Physical drive# is equal to logical drive# */
+#define LD2PT(drv) 0                /* Always mounts the 1st partition */
+#define _LOGICAL_DRIVES _DRIVES
+
+#endif
+
+
+/* File function return code (FRESULT) */
+
+typedef enum {
+    FR_OK = 0,          /* 0 */
+    FR_NOT_READY,       /* 1 */
+    FR_NO_FILE,         /* 2 */
+    FR_NO_PATH,         /* 3 */
+    FR_INVALID_NAME,    /* 4 */
+    FR_INVALID_DRIVE,   /* 5 */
+    FR_DENIED,          /* 6 */
+    FR_EXIST,           /* 7 */
+    FR_RW_ERROR,        /* 8 */
+    FR_WRITE_PROTECTED, /* 9 */
+    FR_NOT_ENABLED,     /* 10 */
+    FR_NO_FILESYSTEM,   /* 11 */
+    FR_INVALID_OBJECT,  /* 12 */
+    FR_MKFS_ABORTED,    /* 13 */
+    FR_IS_DIRECTORY,    /* 14 */
+    FR_IS_READONLY,     /* 15 */
+    FR_DIR_NOT_EMPTY,   /* 16 */
+    FR_NOT_DIRECTORY    /* 17 */
+} FRESULT;
+
+
+
+/*-----------------------------------------------------*/
+/* FatFs module application interface                  */
+
+#if _USE_DRIVE_PREFIX == 0
+FRESULT f_mount (BYTE, FATFS*);                             /* Mount/Unmount a logical drive */
+FRESULT f_open (FATFS*, FIL*, const UCHAR*, BYTE);          /* Open or create a file */
+FRESULT f_read (FIL*, void*, UINT, UINT*);                  /* Read data from a file */
+FRESULT f_write (FIL*, const void*, UINT, UINT*);           /* Write data to a file */
+FRESULT f_lseek (FIL*, DWORD);                              /* Move file pointer of a file object */
+FRESULT f_close (FIL*);                                     /* Close an open file object */
+FRESULT f_opendir (FATFS*, DIR*, const UCHAR*);             /* Open an existing directory */
+FRESULT f_readdir (DIR*, FILINFO*);                         /* Read a directory item */
+FRESULT f_stat (FATFS*, const UCHAR*, FILINFO*);            /* Get file status */
+FRESULT f_getfree (FATFS*, const UCHAR*, DWORD*);           /* Get number of free clusters on the drive */
+FRESULT f_sync (FIL*);                                      /* Flush cached data of a writing file */
+FRESULT f_unlink (FATFS*, const UCHAR*);                    /* Delete an existing file or directory */
+FRESULT f_mkdir (FATFS*, const UCHAR*);                     /* Create a new directory */
+FRESULT f_chmod (FATFS*, const UCHAR*, BYTE, BYTE);         /* Change file/dir attriburte */
+FRESULT f_rename (FATFS*, const UCHAR*, const UCHAR*);      /* Rename/Move a file or directory */
+FRESULT f_mkfs (BYTE, BYTE, WORD);                          /* Create a file system on the drive */
+FRESULT f_chdir (FATFS*, const UCHAR*);                     /* Change current directory */
+
+#else
+
+FRESULT f_mount (BYTE, FATFS*);                             /* Mount/Unmount a logical drive */
+FRESULT f_open (FIL*, const UCHAR*, BYTE);                  /* Open or create a file */
+FRESULT f_read (FIL*, void*, UINT, UINT*);                  /* Read data from a file */
+FRESULT f_write (FIL*, const void*, UINT, UINT*);           /* Write data to a file */
+FRESULT f_lseek (FIL*, DWORD);                              /* Move file pointer of a file object */
+FRESULT f_close (FIL*);                                     /* Close an open file object */
+FRESULT f_opendir (DIR*, const UCHAR*);                     /* Open an existing directory */
+FRESULT f_readdir (DIR*, FILINFO*);                         /* Read a directory item */
+FRESULT f_stat (const UCHAR*, FILINFO*);                    /* Get file status */
+FRESULT f_getfree (const UCHAR*, DWORD*, FATFS**);          /* Get number of free clusters on the drive */
+FRESULT f_sync (FIL*);                                      /* Flush cached data of a writing file */
+FRESULT f_unlink (const UCHAR*);                            /* Delete an existing file or directory */
+FRESULT f_mkdir (const UCHAR*);                             /* Create a new directory */
+FRESULT f_chmod (const UCHAR*, BYTE, BYTE);                 /* Change file/dir attriburte */
+FRESULT f_rename (const UCHAR*, const UCHAR*);              /* Rename/Move a file or directory */
+FRESULT f_mkfs (BYTE, BYTE, WORD);                          /* Create a file system on the drive */
+FRESULT f_chdir (const UCHAR*);                             /* Change current directory */
+
+#endif
+
+/* Low Level functions */
+FRESULT l_opendir(FATFS* fs, DWORD cluster, DIR *dirobj);   /* Open an existing directory by its start cluster */
+FRESULT l_opencluster(FATFS *fs, FIL *fp, DWORD clust);     /* Open a cluster by number as a read-only file */
+FRESULT l_openfilebycluster(FATFS *fs, FIL *fp, const UCHAR *path, DWORD clust, DWORD fsize);	/* Open a file by its start cluster using supplied file size */
+FRESULT l_getfree (FATFS*, const UCHAR*, DWORD*, DWORD);    /* Get number of free clusters on the drive, limited */
+
+#if _USE_STRFUNC
+#define feof(fp) ((fp)->fptr == (fp)->fsize)
+#define EOF -1
+int fputc (int, FIL*);                              /* Put a character to the file */
+int fputs (const char*, FIL*);                      /* Put a string to the file */
+int fprintf (FIL*, const char*, ...);               /* Put a formatted string to the file */
+char* fgets (char*, int, FIL*);                     /* Get a string from the file */
+#endif
+
+/* User defined function to give a current time to fatfs module */
+
+#if CONFIG_RTC_VARIANT > 0
+DWORD get_fattime (void); /* 31-25: Year(0-127 org.1980), 24-21: Month(1-12), 20-16: Day(1-31) */
+                            /* 15-11: Hour(0-23), 10-5: Minute(0-59), 4-0: Second(0-29 *2) */
+#else
+/* Fixed time: 1982-08-31 0:00:00, same month as the introduction of the C64 */
+#  define get_fattime() 0x51f0000
+#endif
+
+/* File access control and file status flags (FIL.flag) */
+
+#define FA_READ             0x01
+#define FA_OPEN_EXISTING    0x00
+#if _FS_READONLY == 0
+#define FA_WRITE            0x02
+#define FA_CREATE_NEW       0x04
+#define FA_CREATE_ALWAYS    0x08
+#define FA_OPEN_ALWAYS      0x10
+#define FA__WRITTEN         0x20
+#define FA__DIRTY           0x40
+#endif
+#define FA__ERROR           0x80
+
+
+/* FAT sub type (FATFS.fs_type) */
+
+#define FS_FAT12    1
+#define FS_FAT16    2
+#define FS_FAT32    3
+
+
+/* File attribute bits for directory entry */
+
+#define AM_RDO  0x01    /* Read only */
+#define AM_HID  0x02    /* Hidden */
+#define AM_SYS  0x04    /* System */
+#define AM_VOL  0x08    /* Volume label */
+#define AM_LFN  0x0F    /* LFN entry */
+#define AM_DIR  0x10    /* Directory */
+#define AM_ARC  0x20    /* Archive */
+
+
+
+/* Offset of FAT structure members */
+
+#define BS_jmpBoot          0
+#define BS_OEMName          3
+#define BPB_BytsPerSec      11
+#define BPB_SecPerClus      13
+#define BPB_RsvdSecCnt      14
+#define BPB_NumFATs         16
+#define BPB_RootEntCnt      17
+#define BPB_TotSec16        19
+#define BPB_Media           21
+#define BPB_FATSz16         22
+#define BPB_SecPerTrk       24
+#define BPB_NumHeads        26
+#define BPB_HiddSec         28
+#define BPB_TotSec32        32
+#define BS_55AA             510
+
+#define BS_DrvNum           36
+#define BS_BootSig          38
+#define BS_VolID            39
+#define BS_VolLab           43
+#define BS_FilSysType       54
+
+#define BPB_FATSz32         36
+#define BPB_ExtFlags        40
+#define BPB_FSVer           42
+#define BPB_RootClus        44
+#define BPB_FSInfo          48
+#define BPB_BkBootSec       50
+#define BS_DrvNum32         64
+#define BS_BootSig32        66
+#define BS_VolID32          67
+#define BS_VolLab32         71
+#define BS_FilSysType32     82
+
+#define FSI_LeadSig         0
+#define FSI_StrucSig        484
+#define FSI_Free_Count      488
+#define FSI_Nxt_Free        492
+
+#define MBR_Table           446
+
+#define DIR_Name            0
+#define DIR_Attr            11
+#define DIR_NTres           12
+#define DIR_Chksum          13
+#define DIR_CrtTime         14
+#define DIR_CrtDate         16
+#define DIR_FstClusHI       20
+#define DIR_WrtTime         22
+#define DIR_WrtDate         24
+#define DIR_FstClusLO       26
+#define DIR_FileSize        28
+
+
+
+/* Multi-byte word access macros  */
+
+#if _MCU_ENDIAN == 1    /* Use word access */
+#define LD_WORD(ptr)        (WORD)(*(WORD*)(BYTE*)(ptr))
+#define LD_DWORD(ptr)       (DWORD)(*(DWORD*)(BYTE*)(ptr))
+#define ST_WORD(ptr,val)    *(WORD*)(BYTE*)(ptr)=(WORD)(val)
+#define ST_DWORD(ptr,val)   *(DWORD*)(BYTE*)(ptr)=(DWORD)(val)
+#elif _MCU_ENDIAN == 2  /* Use byte-by-byte access */
+#define LD_WORD(ptr)        (WORD)(((WORD)*(volatile BYTE*)((ptr)+1)<<8)|(WORD)*(volatile BYTE*)(ptr))
+#define LD_DWORD(ptr)       (DWORD)(((DWORD)*(volatile BYTE*)((ptr)+3)<<24)|((DWORD)*(volatile BYTE*)((ptr)+2)<<16)|((WORD)*(volatile BYTE*)((ptr)+1)<<8)|*(volatile BYTE*)(ptr))
+#define ST_WORD(ptr,val)    *(volatile BYTE*)(ptr)=(BYTE)(val); *(volatile BYTE*)((ptr)+1)=(BYTE)((WORD)(val)>>8)
+#define ST_DWORD(ptr,val)   *(volatile BYTE*)(ptr)=(BYTE)(val); *(volatile BYTE*)((ptr)+1)=(BYTE)((WORD)(val)>>8); *(volatile BYTE*)((ptr)+2)=(BYTE)((DWORD)(val)>>16); *(volatile BYTE*)((ptr)+3)=(BYTE)((DWORD)(val)>>24)
+#else
+#error Do not forget to set _MCU_ENDIAN properly!
+#endif
+
+#define _FATFS
+#endif /* _FATFS */

mk1-src/fileops.c

@@ -0,0 +1,80 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   fileops.c: simple file access functions
+*/
+
+#include <util/delay.h>
+#include "config.h"
+#include "uart.h"
+#include "ff.h"
+#include "fileops.h"
+
+WCHAR ff_convert(WCHAR w, UINT dir) {
+	return w;	
+}
+
+void file_init() {
+	f_mount(0, &fatfs);
+}
+
+void file_open_by_filinfo(FILINFO* fno) {
+	file_res = l_openfilebycluster(&fatfs, &file_handle, (UCHAR*)"", fno->clust, fno->fsize);
+}
+void file_open(uint8_t* filename, BYTE flags) {
+	file_res = f_open(&file_handle, (unsigned char*)filename, flags);
+}
+
+void file_close() {
+	file_res = f_close(&file_handle);
+}
+
+UINT file_read() {
+	UINT bytes_read;
+	file_res = f_read(&file_handle, file_buf, sizeof(file_buf), &bytes_read);
+	return bytes_read;
+}
+
+UINT file_write() {
+	UINT bytes_written;
+	file_res = f_write(&file_handle, file_buf, sizeof(file_buf), &bytes_written);
+	return bytes_written;
+}
+
+UINT file_readblock(void* buf, uint32_t addr, uint16_t size) {
+	UINT bytes_read;
+	file_res = f_lseek(&file_handle, addr);
+	if(file_handle.fptr != addr) {
+		return 0;
+	}
+	file_res = f_read(&file_handle, buf, size, &bytes_read);
+	return bytes_read;
+}
+
+UINT file_writeblock(void* buf, uint32_t addr, uint16_t size) {
+	UINT bytes_written;
+	file_res = f_lseek(&file_handle, addr);
+	if(file_res) return 0;
+	file_res = f_write(&file_handle, buf, size, &bytes_written);
+	return bytes_written;
+}

mk1-src/fileops.h

@@ -0,0 +1,45 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   fileops.h: simple file access functions
+*/
+
+#ifndef FILEOPS_H
+#define FILEOPS_H
+#include "ff.h"
+
+BYTE file_buf[512];
+FATFS fatfs;
+FIL file_handle;
+FRESULT file_res;
+uint8_t file_lfn[256];
+
+void file_init(void);
+void file_open(uint8_t* filename, BYTE flags);
+void file_open_by_filinfo(FILINFO* fno);
+void file_close(void);
+UINT file_read(void);
+UINT file_write(void);
+UINT file_readblock(void* buf, uint32_t addr, uint16_t size);
+UINT file_writeblock(void* buf, uint32_t addr, uint16_t size);
+#endif

mk1-src/filetypes.c

@@ -0,0 +1,273 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   filetypes.c: directory scanning and file type detection
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <avr/pgmspace.h>
+#include <util/delay.h>
+#include "config.h"
+#include "uart.h"
+#include "filetypes.h"
+#include "ff.h"
+#include "smc.h"
+#include "fileops.h"
+#include "crc16.h"
+#include "memory.h"
+#include "led.h"
+
+uint16_t scan_flat(const char* path) {
+	DIR dir;
+	FRESULT res;
+	FILINFO fno;
+	fno.lfn = NULL;
+	res = f_opendir(&dir, (unsigned char*)path);
+	uint16_t numentries = 0;
+	if (res == FR_OK) {
+		for (;;) {
+			res = f_readdir(&dir, &fno);
+			if(res != FR_OK || fno.fname[0] == 0)break;
+			numentries++;
+		}
+	}
+	return numentries;
+}
+
+uint16_t scan_dir(char* path, char mkdb, uint32_t this_dir_tgt) {
+	DIR dir;
+	FILINFO fno;
+	FRESULT res;
+	uint8_t len;
+	unsigned char* fn;
+	static unsigned char depth = 0;
+	static uint16_t crc;
+	static uint32_t db_tgt;
+	static uint32_t next_subdir_tgt;
+	static uint32_t parent_tgt;
+	static uint32_t dir_end = 0;
+	static uint8_t was_empty = 0;
+	uint32_t dir_tgt;
+	uint16_t numentries;
+	uint32_t dirsize;
+	uint8_t pass = 0;
+
+	dir_tgt = this_dir_tgt;
+	if(depth==0) {
+		crc = 0;
+		db_tgt = SRAM_DB_ADDR+0x10;
+		dir_tgt = SRAM_DIR_ADDR;
+		next_subdir_tgt = SRAM_DIR_ADDR;
+		this_dir_tgt = SRAM_DIR_ADDR;
+		parent_tgt = 0;
+		dprintf("root dir @%lx\n", dir_tgt);
+	}	
+	
+	fno.lfn = file_lfn;
+	numentries=0;
+	for(pass = 0; pass < 2; pass++) {
+		if(pass) {
+			dirsize = 4*(numentries);
+//			dir_tgt_next = dir_tgt + dirsize + 4; // number of entries + end marker
+			next_subdir_tgt += dirsize + 4;
+			if(parent_tgt) next_subdir_tgt += 4;
+			if(next_subdir_tgt > dir_end) {
+				dir_end = next_subdir_tgt;
+			}
+			dprintf("path=%s depth=%d ptr=%lx entries=%d parent=%lx next subdir @%lx\n", path, depth, db_tgt, numentries, parent_tgt, next_subdir_tgt /*dir_tgt_next*/);
+//			_delay_ms(50);
+			if(mkdb) {
+				dprintf("d=%d Saving %lX to Address %lX  [end]\n", depth, 0L, next_subdir_tgt - 4);
+//				_delay_ms(50);	
+				sram_writelong(0L, next_subdir_tgt - 4);
+			}
+		}
+		res = f_opendir(&dir, (unsigned char*)path);
+		if (res == FR_OK) {
+			if(pass && parent_tgt && mkdb) {
+				// write backlink to parent dir
+				// switch to next bank if record does not fit in current bank
+				if((db_tgt&0xffff) > ((0x10000-(sizeof(next_subdir_tgt)+sizeof(len)+4))&0xffff)) {
+					dprintf("switch! old=%lx ", db_tgt);
+					db_tgt &= 0xffff0000;
+					db_tgt += 0x00010000;
+					dprintf("new=%lx\n", db_tgt);
+				}
+				sram_writelong((parent_tgt-SRAM_MENU_ADDR), db_tgt);
+				sram_writebyte(0, db_tgt+sizeof(next_subdir_tgt));
+				sram_writeblock("../\0", db_tgt+sizeof(next_subdir_tgt)+sizeof(len), 4);
+				sram_writelong((db_tgt-SRAM_MENU_ADDR)|((uint32_t)0x80<<24), dir_tgt);
+				db_tgt += sizeof(next_subdir_tgt)+sizeof(len)+4;
+				dir_tgt += 4;
+			}
+			len = strlen((char*)path);
+			for (;;) {
+				toggle_busy_led();
+				res = f_readdir(&dir, &fno);
+				if (res != FR_OK || fno.fname[0] == 0) {
+					if(pass) {
+						if(!numentries) was_empty=1;
+					}
+					break;
+				}
+				fn = *fno.lfn ? fno.lfn : fno.fname;
+	//			dprintf("%s\n", fn);
+	//			_delay_ms(100);
+				if (*fn == '.') continue;
+				if (fno.fattrib & AM_DIR) {
+					numentries++;
+					if(pass) {
+						path[len]='/';
+						strncpy(path+len+1, (char*)fn, sizeof(fs_path)-len);
+						depth++;
+						if(mkdb) {
+							uint16_t pathlen = strlen(path);
+							// write element pointer to current dir structure
+							dprintf("d=%d Saving %lX to Address %lX  [dir]\n", depth, db_tgt, dir_tgt);
+//							_delay_ms(50);
+							sram_writelong((db_tgt-SRAM_MENU_ADDR)|((uint32_t)0x80<<24), dir_tgt);
+//							sram_writeblock((uint8_t*)&db_tgt, dir_tgt_save, sizeof(dir_tgt_save));
+
+							// save element:
+							//  - path name
+							//  - pointer to sub dir structure
+							if((db_tgt&0xffff) > ((0x10000-(sizeof(next_subdir_tgt) + sizeof(len) + pathlen + 2))&0xffff)) {
+								dprintf("switch! old=%lx ", db_tgt);
+								db_tgt &= 0xffff0000;
+								db_tgt += 0x00010000;
+								dprintf("new=%lx\n", db_tgt);
+							}
+							dprintf("    Saving dir descriptor to %lX, tgt=%lX, path=%s\n", db_tgt, next_subdir_tgt, path);
+//							_delay_ms(100);
+							sram_writelong((next_subdir_tgt-SRAM_MENU_ADDR), db_tgt);
+							sram_writebyte(len+1, db_tgt+sizeof(next_subdir_tgt));
+							sram_writeblock(path, db_tgt+sizeof(next_subdir_tgt)+sizeof(len), pathlen);
+							sram_writeblock("/\0", db_tgt + sizeof(next_subdir_tgt) + sizeof(len) + pathlen, 2);
+//							sram_writeblock((uint8_t*)&dir_tgt, db_tgt+256, sizeof(dir_tgt));
+							db_tgt += sizeof(next_subdir_tgt) + sizeof(len) + pathlen + 2;
+						}
+						parent_tgt = this_dir_tgt;
+						scan_dir(path, mkdb, next_subdir_tgt);
+						dir_tgt += 4;
+//						if(was_empty)dir_tgt_next += 4;
+						was_empty = 0;
+						depth--;
+						path[len]=0;
+					}
+				} else {
+					SNES_FTYPE type = determine_filetype((char*)fn);
+					if(type != TYPE_UNKNOWN) {
+						numentries++;
+						if(pass) {
+							if(mkdb) {
+								snes_romprops_t romprops;
+								path[len]='/';
+								strncpy(path+len+1, (char*)fn, sizeof(fs_path)-len);
+								uint16_t pathlen = strlen(path);
+								switch(type) {
+									case TYPE_SMC:
+// XXX										file_open_by_filinfo(&fno);
+// XXX										if(file_res){
+// XXX											dprintf("ZOMG NOOOO %d\n", file_res);
+// XXX											_delay_ms(30);
+// XXX										}
+// XXX										smc_id(&romprops);
+// XXX										file_close();
+		//								_delay_ms(30);
+										// write element pointer to current dir structure
+//										dprintf("d=%d Saving %lX to Address %lX  [file]\n", depth, db_tgt, dir_tgt);
+//										_delay_ms(50);
+										if((db_tgt&0xffff) > ((0x10000-(sizeof(romprops) + sizeof(len) + pathlen + 1))&0xffff)) {
+											dprintf("switch! old=%lx ", db_tgt);
+											db_tgt &= 0xffff0000;
+											db_tgt += 0x00010000;
+											dprintf("new=%lx\n", db_tgt);
+										}
+										sram_writelong((db_tgt-SRAM_MENU_ADDR), dir_tgt);
+//										sram_writeblock((uint8_t*)&db_tgt, dir_tgt, sizeof(db_tgt));
+										dir_tgt += 4;
+										// save element:
+										//  - SNES header information
+										//  - file name
+										sram_writeblock((uint8_t*)&romprops, db_tgt, sizeof(romprops));
+										sram_writebyte(len+1, db_tgt + sizeof(romprops));
+										sram_writeblock(path, db_tgt + sizeof(romprops) + sizeof(len), pathlen + 1);
+										db_tgt += sizeof(romprops) + sizeof(len) + pathlen + 1;
+										break;
+									case TYPE_UNKNOWN:
+									default:
+										break;
+								}
+								path[len]=0;
+		//						dprintf("%s ", path);
+		//						_delay_ms(30);
+							}
+						} else {
+							unsigned char* sfn = fno.fname;
+							while(*sfn != 0) {
+								crc += crc16_update(crc, sfn++, 1);
+							}
+						}
+					}
+	//					dprintf("%s/%s\n", path, fn);
+	//					_delay_ms(50);
+				}
+			}
+		} else uart_putc(0x30+res);
+	}
+//	dprintf("%x\n", crc);
+//	_delay_ms(50);
+	sram_writelong(db_tgt, SRAM_DB_ADDR+4);
+	sram_writelong(dir_end, SRAM_DB_ADDR+8);
+	return crc;
+}
+
+
+SNES_FTYPE determine_filetype(char* filename) {
+	char* ext = strrchr(filename, '.');
+	if(ext == NULL)
+		return TYPE_UNKNOWN;
+	if(!strcasecmp_P(ext+1, PSTR("SMC"))) {
+		return TYPE_SMC;
+	}/* later
+	if(!strcasecmp_P(ext+1, PSTR("SRM"))) {
+		return TYPE_SRM;
+	}
+	if(!strcasecmp_P(ext+1, PSTR("SPC"))) {
+		return TYPE_SPC;
+	}*/
+	return TYPE_UNKNOWN;
+}
+
+FRESULT get_db_id(uint16_t* id) {
+	file_open((uint8_t*)"/sd2snes/sd2snes.db", FA_READ);
+	if(file_res == FR_OK) {
+		file_readblock(id, 0, 2);
+/* XXX */// *id=0xdead;
+		file_close();
+	} else {
+		*id=0xdead;
+	}
+	return file_res;
+}

mk1-src/filetypes.h

@@ -0,0 +1,45 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   filetypes.h: directory scanning and file type detection
+*/
+
+#ifndef FILETYPES_H
+#define FILETYPES_H
+
+#include "ff.h"
+typedef enum {
+	TYPE_UNKNOWN = 0,	/* 0 */
+	TYPE_SMC,		/* 1 */
+	TYPE_SRM,		/* 2 */
+	TYPE_SPC		/* 3 */
+} SNES_FTYPE;
+
+
+char fs_path[256];
+SNES_FTYPE determine_filetype(char* filename);
+//uint32_t scan_fs();
+uint16_t scan_dir(char* path, char mkdb, uint32_t this_subdir_tgt);
+FRESULT get_db_id(uint16_t*);
+
+#endif

mk1-src/fpga.c

@@ -0,0 +1,181 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   fpga.c: FPGA (re)configuration
+*/
+
+
+/*
+
+   FPGA pin mapping
+   ================
+   PROG_B		PD3		OUT
+   CCLK			PD4		OUT
+   INIT_B		PD7		IN
+   DIN			PC7		OUT
+   DONE			PA3		IN
+ */
+
+#include <avr/pgmspace.h>
+#include <util/delay.h>
+#include "fpga.h"
+#include "config.h"
+#include "uart.h"
+#include "sdcard.h"
+#include "diskio.h"
+#include "integer.h"
+#include "ff.h"
+#include "fileops.h"
+#include "fpga_spi.h"
+#include "spi.h"
+#include "avrcompat.h"
+#include "led.h"
+
+/*DWORD get_fattime(void) {
+	return 0L;
+}*/
+void set_prog_b(uint8_t val) {
+	if(val) {
+		PORTD |= _BV(PD3);
+	} else {
+		PORTD &= ~_BV(PD3);
+	}
+}
+
+void set_cclk(uint8_t val) {
+	if(val) {
+		PORTD |= _BV(PD4);
+	} else {
+		PORTD &= ~_BV(PD4);
+	}
+}
+
+void fpga_init() {
+	DDRD &= ~_BV(PD7);  // PD7 is input
+
+	DDRC = _BV(PC7);	// for FPGA config, PC7 is output
+
+	DDRD |= _BV(PD3) | _BV(PD4); // PD3, PD4 are outputs
+	
+	DDRA = ~_BV(PA3); // PA3 is input <- DONE
+
+	DDRB |= _BV(PB2); // DMA_CTRL preinit
+	PORTB |= _BV(PB2);
+	SPI_OFFLOAD=0;
+	set_cclk(0);    // initial clk=0
+}
+
+int fpga_get_done(void) {
+	return PINA & _BV(PA3);
+}
+
+void fpga_postinit() {
+	DDRA |= _BV(PA0) | _BV(PA1) | _BV(PA2) | _BV(PA4) | _BV(PA5) | _BV(PA6); // MAPPER+NEXTADDR output
+	DDRB |= _BV(PB1) | _BV(PB0);	// turn PB2 into output, enable AVR_BANK
+	DDRD |= _BV(PD7);	// turn PD7 into output
+}
+
+void fpga_pgm(uint8_t* filename) {
+	int MAXRETRIES = 10;
+	int retries = MAXRETRIES;
+	int j=0;
+	do {
+		set_prog_b(0);
+		uart_putc('P');
+		set_prog_b(1);
+		loop_until_bit_is_set(PIND, PD7);
+		uart_putc('p');
+		
+		UINT bytes_read;
+
+		// open configware file
+		file_open(filename, FA_READ);
+		if(file_res) {
+			uart_putc('?');
+			uart_putc(0x30+file_res);
+			return;
+		}
+	
+		for (;;) {
+			if(!(j++ % 8)) {
+				toggle_pwr_led();
+			}
+			bytes_read = file_read();
+			if (file_res || bytes_read == 0) break;   // error or eof
+			for(int i=0; i<bytes_read; i++) {
+				FPGA_SEND_BYTE_SERIAL(file_buf[i]);
+			}
+		}
+		file_close();
+		_delay_ms(100);
+	} while (!fpga_get_done() && retries--);
+	if(!fpga_get_done()) {
+		dprintf("FPGA failed to configure after %d tries.\n", MAXRETRIES);
+		_delay_ms(50);
+		led_panic();
+	}
+	fpga_postinit();
+}
+
+void set_avr_ena(uint8_t val) {
+	if(val) { // shared mode
+		PORTD |= _BV(PD7);
+		// Disable SPI double speed mode -> clock = f/4
+ 		SPSR = 0;
+		dprintf("SPI slow\n");
+	} else { // avr only
+		PORTD &= ~_BV(PD7);
+		// Enable SPI double speed mode -> clock = f/2
+		SPSR = _BV(SPI2X);
+		dprintf("SPI fast\n");
+	}
+}
+
+void set_avr_mapper(uint8_t val) {
+	SPI_SS_HIGH();
+	FPGA_SS_LOW();
+	spiTransferByte(0x30 | (val & 0x0f));
+	FPGA_SS_HIGH();
+	SPI_SS_LOW();
+}
+
+void set_avr_bank(uint8_t val) {
+	SPI_SS_HIGH();
+	FPGA_SS_LOW();
+	spiTransferByte(0x00); // SET ADDRESS
+	spiTransferByte(val * 0x20); // select chip
+	spiTransferByte(0x00); // select chip
+	spiTransferByte(0x00); // select chip
+	FPGA_SS_HIGH();
+	SPI_SS_LOW();
+}
+
+uint8_t fpga_test() {
+	spi_fpga();
+	spiTransferByte(0xF0); // TEST
+	spiTransferByte(0x00); // dummy
+	uint8_t result = spiTransferByte(0x00);
+	spi_none();
+	return result;
+}
+

mk1-src/fpga.h

@@ -0,0 +1,78 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   fpga.h: FPGA (re)configuration
+*/
+
+#ifndef FPGA_H
+#define FPGA_H
+
+void fpga_init(void);
+uint8_t fpga_test(void);
+void fpga_postinit(void);
+void fpga_pgm(uint8_t* filename);
+
+void set_avr_read(uint8_t val);
+void set_avr_write(uint8_t val);
+void set_avr_ena(uint8_t val);
+void set_avr_nextaddr(uint8_t val);
+void set_avr_addr_reset(uint8_t val);
+void set_avr_data(uint8_t data);
+void set_avr_addr_en(uint8_t val);
+void set_avr_mapper(uint8_t val);
+void set_avr_bank(uint8_t val);
+
+uint8_t SPI_OFFLOAD;
+
+#define FPGA_TEST_TOKEN	(0xa5)
+
+// some macros for bulk transfers (faster)
+#define FPGA_SEND_BYTE(data)	do {SET_AVR_DATA(data); CCLK();} while (0)
+#define FPGA_SEND_BYTE_SERIAL(data)	do {SET_AVR_DATA(data); CCLK();\
+SET_AVR_DATA(data<<1); CCLK(); SET_AVR_DATA(data<<2); CCLK();\
+SET_AVR_DATA(data<<3); CCLK(); SET_AVR_DATA(data<<4); CCLK();\
+SET_AVR_DATA(data<<5); CCLK(); SET_AVR_DATA(data<<6); CCLK();\
+SET_AVR_DATA(data<<7); CCLK();} while (0)
+#define SET_CCLK()				do {PORTD |= _BV(PD4);} while (0)
+#define CLR_CCLK()				do {PORTD &= ~_BV(PD4);} while (0)
+#define CCLK()					do {SET_CCLK(); CLR_CCLK();} while (0)
+#define SET_AVR_READ()			do {PORTB |= _BV(PB3);} while (0)
+#define CLR_AVR_READ()			do {PORTB &= ~_BV(PB3);} while (0)
+#define SET_AVR_WRITE()			do {PORTB |= _BV(PB2);} while (0)
+#define CLR_AVR_WRITE()			do {PORTB &= ~_BV(PB2);} while (0)
+#define SET_AVR_EXCL()			do {PORTD |= _BV(PD7);} while (0)
+#define CLR_AVR_EXCL()			do {PORTD &= ~_BV(PD7);} while (0)
+#define SET_AVR_NEXTADDR()		do {PORTA |= _BV(PA4);} while (0)
+#define CLR_AVR_NEXTADDR()		do {PORTA &= ~_BV(PA4);} while (0)
+#define SET_AVR_ADDR_RESET()	do {PORTA |= _BV(PA5);} while (0)
+#define CLR_AVR_ADDR_RESET()	do {PORTA &= ~_BV(PA5);} while (0)
+#define SET_AVR_ADDR_EN()		do {PORTA |= _BV(PA6);} while (0)
+#define CLR_AVR_ADDR_EN()		do {PORTA &= ~_BV(PA6);} while (0)
+#define AVR_NEXTADDR()			do {SET_AVR_NEXTADDR(); CLR_AVR_NEXTADDR();} while (0)
+#define AVR_ADDR_RESET()		do {CLR_AVR_ADDR_RESET();\
+									AVR_NEXTADDR();SET_AVR_ADDR_RESET();} while (0)
+#define SET_AVR_DATA(data)		do {PORTC = (uint8_t)data;} while (0)
+#define AVR_READ()				do {CLR_AVR_READ(); SET_AVR_READ();} while (0)
+#define AVR_WRITE()				do {CLR_AVR_WRITE(); SET_AVR_WRITE();} while (0)
+#define	AVR_DATA				(PINC)
+#endif

mk1-src/fpga_spi.c

@@ -0,0 +1,99 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   fpga_spi.h: functions for SPI ctrl, SRAM interfacing and feature configuration
+*/
+/*
+
+	SPI commands
+
+	cmd	param		function	
+   =============================================
+	00	bb[hh[ll]]	set address to 0xbb0000, 0xbbhh00, or 0xbbhhll
+	10	bbhhll		set SNES input address mask to 0xbbhhll
+	20	bbhhll		set SRAM address mask to 0xbbhhll
+	3m	-		set mapper to m
+				0=HiROM, 1=LoROM, 2=ExHiROM, 7=Menu
+	80	-		read with increment
+	81	-		read w/o increment
+	90	{xx}*		write xx with increment
+	91	{xx}*		write xx w/o increment
+	F0	-		receive test token (to see if FPGA is alive)
+	
+*/
+
+#include <avr/pgmspace.h>
+#include <util/delay.h>
+#include "avrcompat.h"
+#include "fpga.h"
+#include "config.h"
+#include "uart.h"
+#include "spi.h"
+#include "fpga_spi.h"
+
+void spi_fpga(void) {
+	SPI_SS_HIGH();
+	FPGA_SS_LOW();
+}
+
+void spi_sd(void) {
+	FPGA_SS_HIGH();
+	SPI_SS_LOW();
+}
+
+void spi_none(void) {
+	FPGA_SS_HIGH();
+	SPI_SS_HIGH();
+}
+
+void fpga_spi_init(void) {
+	DDRC = _BV(PC7);
+	FPGA_SS_HIGH();
+}
+
+void set_avr_addr(uint32_t address) {
+	spi_fpga();
+	spiTransferByte(0x00);
+	spiTransferByte((address>>16)&0xff);
+	spiTransferByte((address>>8)&0xff);
+	spiTransferByte((address)&0xff);
+	spi_none();
+}
+
+void set_saveram_mask(uint32_t mask) {
+	spi_fpga();
+	spiTransferByte(0x20);
+	spiTransferByte((mask>>16)&0xff);
+	spiTransferByte((mask>>8)&0xff);
+	spiTransferByte((mask)&0xff);
+	spi_none();
+}
+
+void set_rom_mask(uint32_t mask) {
+	spi_fpga();
+	spiTransferByte(0x10);
+	spiTransferByte((mask>>16)&0xff);
+	spiTransferByte((mask>>8)&0xff);
+	spiTransferByte((mask)&0xff);
+	spi_none();
+}

mk1-src/fpga_spi.h

@@ -0,0 +1,38 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   fpga_spi.h: functions for SPI ctrl, SRAM interfacing and feature configuration
+*/
+
+#define FPGA_SS_HIGH()	do {PORTC |= _BV(PC7);} while (0)
+#define FPGA_SS_LOW()	do {PORTC &= ~_BV(PC7);} while (0)
+
+void fpga_spi_init(void);
+void fpga_spi_test(void);
+void spi_fpga(void);
+void spi_sd(void);
+void spi_none(void);
+void set_avr_addr(uint32_t);
+void set_saveram_mask(uint32_t);
+void set_rom_mask(uint32_t);
+

mk1-src/gcctest.awk

@@ -0,0 +1,15 @@
+#! /usr/bin/gawk -f
+#
+# Parse the output of (avr-)gcc --version for the version number
+# and output YES if it is at least 4.3.
+
+{
+  match($0, /\) ([0-9]+)\.([0-9]+)\./, ver);
+  if (RLENGTH > 0) {
+    major = 0+ver[1];
+    minor = 0+ver[2];
+    if (major > 4 || (major == 4 && minor > 2)) {
+      print "YES";
+    }
+  }
+}

mk1-src/integer.h

@@ -0,0 +1,31 @@
+/* Integer definitions for ff, based on example code from ChaN */
+
+#ifndef _INTEGER
+
+#include <stdint.h>
+
+/* These types are assumed as 16-bit or larger integer */
+typedef int16_t  INT;
+typedef uint16_t UINT;
+
+/* These types are assumed as 8-bit integer */
+typedef int8_t  CHAR;
+typedef uint8_t UCHAR;
+typedef uint8_t BYTE;
+
+/* These types are assumed as 16-bit integer */
+typedef int16_t  SHORT;
+typedef uint16_t USHORT;
+typedef uint16_t WORD;
+typedef uint16_t WCHAR;
+
+/* These types are assumed as 32-bit integer */
+typedef int32_t  LONG;
+typedef uint32_t ULONG;
+typedef uint32_t DWORD;
+
+/* Boolean type */
+typedef enum { FALSE = 0, TRUE } BOOL;
+
+#define _INTEGER
+#endif

mk1-src/led.c

@@ -0,0 +1,110 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   led.c: LED control
+*/
+
+#include <avr/io.h>
+#include <util/delay.h>
+#include "config.h"
+#include "led.h"
+
+static uint8_t led_bright[16]={255,253,252,251,249,247,244,239,232,223,210,191,165,127,74,0};
+static uint8_t curr_bright = 15;
+static uint8_t led_bounce_dir = 1;
+
+volatile uint8_t led_state;
+
+void led_panic(void) {
+        led_std();
+
+        while(1) {
+                set_pwr_led(1);
+                set_busy_led(1);
+                _delay_ms(150);
+                set_pwr_led(0);
+                set_busy_led(0);
+                _delay_ms(150);
+        }
+
+}
+
+void toggle_busy_led(void) {
+	PORTB &= ~_BV(PB3);
+	DDRB ^= _BV(PB3);
+}
+
+void toggle_pwr_led(void) {
+	PORTB &= ~_BV(PB0);
+	DDRB ^= _BV(PB0);
+}
+
+void set_busy_led(uint8_t state) {
+	PORTB &= ~_BV(PB3);
+	if(state) {
+		DDRB |= _BV(PB3);
+	} else {
+		DDRB &= ~_BV(PB3);
+	}
+}
+
+void set_pwr_led(uint8_t state) {
+	PORTB &= ~_BV(PB0);
+	if(state) {
+		DDRB |= _BV(PB0);
+	} else {
+		DDRB &= ~_BV(PB0);
+	}
+}
+
+void set_busy_pwm(uint8_t brightness) {
+	OCR0A = led_bright[brightness];
+	set_busy_led(1);
+}
+
+void bounce_busy_led() {
+	set_busy_pwm(curr_bright);
+	if(led_bounce_dir) {
+		curr_bright--;
+		if(curr_bright==0) {
+			led_bounce_dir = 0;
+		}
+	} else {
+		curr_bright++;
+		if(curr_bright==15) {
+			led_bounce_dir = 1;
+		}
+	}
+}
+
+void led_pwm() {
+        set_busy_led(1);
+        TCCR0A = 0x83;
+        TCCR0B = 0x01;
+}
+
+void led_std() {
+	set_busy_led(0);
+	TCCR0A = 0;
+	TCCR0B = 0;
+}

mk1-src/led.h

@@ -0,0 +1,50 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   led.c: LED control
+*/
+
+#ifndef LED_H
+#define LED_H
+
+#include "config.h"
+#include "uart.h"
+
+/* LED-to-bit mapping - BUSY/DIRTY are only used for SINGLE_LED */
+#define LED_ERROR      1
+#define LED_BUSY       2
+#define LED_DIRTY      4
+
+extern volatile uint8_t led_state;
+
+/* Update the LEDs to match the buffer state */
+void toggle_busy_led(void);
+void toggle_pwr_led(void);
+void set_busy_led(uint8_t);
+void set_pwr_led(uint8_t);
+void set_busy_pwm(uint8_t brightness);
+void bounce_busy_led(void);
+void led_pwm(void);
+void led_std(void);
+void led_panic(void);
+#endif

mk1-src/main.c

@@ -0,0 +1,400 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   main.c: initialization and flow
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <avr/boot.h>
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+#include <avr/power.h>
+#include <avr/wdt.h>
+#include <util/delay.h>
+#include "config.h"
+#include "diskio.h"
+#include "ff.h"
+#include "led.h"
+/* #include "timer.h" */
+#include "fpga.h"
+#include "uart.h"
+#include "ustring.h"
+#include "utils.h"
+#include "snes.h"
+#include "fileops.h"
+#include "memory.h"
+#include "fpga_spi.h"
+#include "spi.h"
+#include "avrcompat.h"
+#include "filetypes.h"
+#include "sdcard.h"
+
+void writetest(void) {
+// HERE BE LIONS, GET IN THE CAR
+	char teststring[58];
+	while(1) {
+		sram_writeblock((void*)"Testtext of DOOM!!1! 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ", SRAM_SCRATCHPAD+0x20, 58);
+		sram_readblock((void*)teststring, SRAM_SCRATCHPAD+0x20, 58);
+		teststring[57]=0;
+		dprintf("%s\n", teststring);
+	}
+// END OF LIONS
+}
+
+
+void memtest(void) {
+/* HERE BE DRAGONS */
+	uint32_t dbg_i;
+	for(dbg_i=0; dbg_i < 65536; dbg_i++) {
+		sram_writeshort((uint16_t)dbg_i&0xffff, dbg_i*2);
+	}
+	save_sram((uint8_t*)"/sd2snes/memtest", 0x20000, 0);
+	set_pwr_led(0);
+	while(1);
+/* END OF DRAGONS */
+}
+
+
+/* Make sure the watchdog is disabled as soon as possible    */
+/* Copy this code to your bootloader if you use one and your */
+/* MCU doesn't disable the WDT after reset!                  */
+void get_mcusr(void) \
+      __attribute__((naked)) \
+      __attribute__((section(".init3")));
+void get_mcusr(void)
+{
+  MCUSR = 0;
+  wdt_disable();
+}
+
+#ifdef CONFIG_MEMPOISON
+void poison_memory(void) \
+  __attribute__((naked)) \
+  __attribute__((section(".init1")));
+void poison_memory(void) {
+  register uint16_t i;
+  register uint8_t  *ptr;
+
+  asm("clr r1\n");
+  /* There is no RAMSTARt variable =( */
+  if (RAMEND > 2048 && RAMEND < 4096) {
+    /* 2K memory */
+    ptr = (void *)RAMEND-2047;
+    for (i=0;i<2048;i++)
+      ptr[i] = 0x55;
+  } else if (RAMEND > 4096 && RAMEND < 8192) {
+    /* 4K memory */
+    ptr = (void *)RAMEND-4095;
+    for (i=0;i<4096;i++)
+      ptr[i] = 0x55;
+  } else {
+    /* Assume 8K memory */
+    ptr = (void *)RAMEND-8191;
+    for (i=0;i<8192;i++)
+      ptr[i] = 0x55;
+  }
+}
+#endif
+
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 1)
+int main(void) __attribute__((OS_main));
+#endif
+int main(void) {
+#if defined __AVR_ATmega644__ || defined __AVR_ATmega644P__ || defined __AVR_ATmega2561__
+  asm volatile("in  r24, %0\n"
+               "ori r24, 0x80\n"
+               "out %0, r24\n"
+               "out %0, r24\n"
+               :
+               : "I" (_SFR_IO_ADDR(MCUCR))
+               : "r24"
+               );
+#elif defined __AVR_ATmega32__
+  asm volatile ("in  r24, %0\n"
+                "ori r24, 0x80\n"
+                "out %0, r24\n"
+                "out %0, r24\n"
+                :
+                : "I" (_SFR_IO_ADDR(MCUCSR))
+                : "r24"
+                );
+#elif defined __AVR_ATmega128__ || defined __AVR_ATmega1281__
+  /* Just assume that JTAG doesn't hurt us on the m128 */
+#else
+#  error Unknown chip!
+#endif
+
+#ifdef CLOCK_PRESCALE
+	clock_prescale_set(CLOCK_PRESCALE);
+#endif
+	set_pwr_led(0);
+	set_busy_led(1);
+	spi_none();
+	snes_reset(1);
+	uart_init();
+	sei();
+	_delay_ms(100);
+	disk_init();
+	snes_init();
+/*	timer_init(); */
+	uart_puts_P(PSTR("\nsd2snes " VERSION));
+	uart_putcrlf();
+
+	file_init();
+	FATFS fatfs;
+	f_mount(0,&fatfs);
+	uart_putc('W');
+	fpga_init();
+	fpga_pgm((uint8_t*)"/sd2snes/main.bit");
+	_delay_ms(100);
+	set_pwr_led(1);
+	fpga_spi_init();
+	uart_putc('!');
+	_delay_ms(100);
+
+restart:
+	set_avr_ena(0);
+	snes_reset(1);
+
+	*fs_path=0;
+	uint16_t saved_dir_id;
+	get_db_id(&saved_dir_id);
+
+	uint16_t mem_dir_id = sram_readshort(SRAM_DIRID);
+	uint32_t mem_magic = sram_readlong(SRAM_SCRATCHPAD);
+
+	while(0) {
+		SD_SPI_OFFLOAD=0;
+		set_avr_addr(0L);
+		sd_read(0, file_buf, 0L, 1);
+		uart_trace((void*)file_buf, 0, 0x200);
+//		sram_writeblock((void*)file_buf, 0, 0x200);
+//		sram_hexdump(0,0x200);
+		uart_putc('+');
+	}
+/* here be strange monsters */
+	while(0){
+//	uint16_t hurdur1 = 0, hurdur2 = 0;
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+	spiTransferByte(0x00);
+        PORTB |= _BV(PB2);
+        DDRB |= _BV(PB2);
+        PORTB &= ~_BV(PB2);
+        DDRB &= ~_BV(PB7); // tristate SCK
+        PORTB |= _BV(PB2);
+        DDRB &= ~_BV(PB2);
+        while(!(PINB & _BV(PB2))) {
+        }
+        DDRB |= _BV(PB7);
+        _delay_ms(1);
+//	dprintf("hurdur1=%d hurdur2=%d\n", hurdur1, hurdur2);
+}
+	if((mem_magic != 0x12345678) || (mem_dir_id != saved_dir_id)) {
+		uint16_t curr_dir_id = scan_dir(fs_path, 0, 0); // generate files footprint
+		dprintf("curr dir id = %x\n", curr_dir_id);
+		if((get_db_id(&saved_dir_id) != FR_OK)	// no database?
+		|| saved_dir_id != curr_dir_id) {	// files changed? // XXX
+			dprintf("saved dir id = %x\n", saved_dir_id);
+			dprintf("rebuilding database...");
+			_delay_ms(50);
+			curr_dir_id = scan_dir(fs_path, 1, 0);	// then rebuild database
+			sram_writeblock(&curr_dir_id, SRAM_DB_ADDR, 2);
+			uint32_t endaddr, direndaddr;
+			sram_readblock(&endaddr, SRAM_DB_ADDR+4, 4);
+			sram_readblock(&direndaddr, SRAM_DB_ADDR+8, 4);
+			dprintf("%lx %lx\n", endaddr, direndaddr);
+			save_sram((uint8_t*)"/sd2snes/sd2snes.db", endaddr-SRAM_DB_ADDR, SRAM_DB_ADDR);
+			save_sram((uint8_t*)"/sd2snes/sd2snes.dir", direndaddr-(SRAM_DIR_ADDR), SRAM_DIR_ADDR);
+			dprintf("done\n"); 
+//			sram_hexdump(SRAM_DB_ADDR, 0x400);
+		} else {
+			dprintf("saved dir id = %x\n", saved_dir_id);
+			dprintf("different card, consistent db, loading db...\n");
+			load_sram((uint8_t*)"/sd2snes/sd2snes.db", SRAM_DB_ADDR);
+			load_sram((uint8_t*)"/sd2snes/sd2snes.dir", SRAM_DIR_ADDR);
+		}
+//	save_sram((uint8_t*)"/debug.smc", 0x400000, 0);	
+//	uart_putc('[');
+//	load_sram((uint8_t*)"/test.srm", SRAM_SAVE_ADDR);
+//	uart_putc(']');
+
+		sram_writeshort(curr_dir_id, SRAM_DIRID);
+		sram_writelong(0x12345678, SRAM_SCRATCHPAD);
+	} else {
+		dprintf("same card, loading db...\n");
+		load_sram((uint8_t*)"/sd2snes/sd2snes.db", SRAM_DB_ADDR);
+		load_sram((uint8_t*)"/sd2snes/sd2snes.dir", SRAM_DIR_ADDR);
+	}
+
+	led_pwm();
+
+//	sram_hexdump(0, 0x200);
+	uart_putc('(');
+	load_rom((uint8_t*)"/sd2snes/menu.bin", SRAM_MENU_ADDR);
+	set_rom_mask(0x3fffff); // force mirroring off
+ 	set_avr_mapper(0x7); // menu mapper XXX
+	uart_putc(')');
+	uart_putcrlf();
+//	sram_hexdump(0x7ffff0, 0x10);
+//	sram_hexdump(0, 0x400);
+//	save_sram((uint8_t*)"/sd2snes/dump", 65536, 0);
+
+	sram_writebyte(0, SRAM_CMD_ADDR);
+
+	set_busy_led(0);
+	set_avr_ena(1);
+
+	_delay_ms(100);
+	uart_puts_P(PSTR("SNES GO!\r\n"));
+	snes_reset(0);
+// writetest();
+/*	snes_reset(1);
+	set_avr_ena(0);
+	led_std();
+	set_busy_led(1);
+	save_sram((uint8_t*)"/sd2snes/dump", 65536, SRAM_MENU_ADDR);
+	set_busy_led(0);
+	set_avr_ena(1);
+	snes_reset(0); */
+	uint8_t cmd = 0;
+
+	while(!sram_reliable());
+	while(!cmd) {
+		cmd=menu_main_loop();
+		switch(cmd) {
+			case 0x01: // SNES_CMD_LOADROM:
+				get_selected_name(file_lfn);
+				_delay_ms(100);
+//				snes_reset(1);
+				set_avr_ena(0);
+				dprintf("Selected name: %s\n", file_lfn);
+				load_rom(file_lfn, SRAM_ROM_ADDR);
+//				save_sram((uint8_t*)"/sd2snes/test.smc", romprops.romsize_bytes, 0);
+				if(romprops.ramsize_bytes) {
+					strcpy(strrchr((char*)file_lfn, (int)'.'), ".srm");
+					dprintf("SRM file: %s\n", file_lfn);
+					load_sram(file_lfn, SRAM_SAVE_ADDR);
+				} else {
+					dprintf("No SRAM\n");
+				}
+				set_avr_ena(1);
+				snes_reset(1);
+				_delay_ms(100);
+				snes_reset(0);
+				break;
+			default:
+				dprintf("unknown cmd: %d\n", cmd);
+				cmd=0; // unknown cmd: stay in loop
+			break;
+		}
+		
+	}
+	dprintf("cmd was %x, going to snes main loop\n", cmd);
+	led_std();
+	cmd=0;
+	uint8_t snes_reset_prev=0, snes_reset_now=0, snes_reset_state=0;
+	uint16_t reset_count=0;
+	while(fpga_test() == FPGA_TEST_TOKEN) {
+		snes_reset_now=get_snes_reset();
+		if(snes_reset_now) {
+			if(!snes_reset_prev) {
+				dprintf("RESET BUTTON DOWN\n");
+				snes_reset_state=1;
+				// reset reset counter
+				reset_count=0;
+			}
+		} else {
+			if(snes_reset_prev) {
+				dprintf("RESET BUTTON UP\n");
+				snes_reset_state=0;
+			}
+		}
+		if(snes_reset_state) {
+			_delay_ms(10);
+			reset_count++;
+		} else {
+			sram_reliable();
+			snes_main_loop();
+		}
+		if(reset_count>100) {
+			reset_count=0;
+			led_std();
+			set_avr_ena(0);
+			snes_reset(1);
+			_delay_ms(100);
+			if(romprops.ramsize_bytes && fpga_test() == 0xa5) {
+				set_busy_led(1);
+				save_sram(file_lfn, romprops.ramsize_bytes, SRAM_SAVE_ADDR);
+				set_busy_led(0);
+			}
+			_delay_ms(1000);
+			set_busy_led(1);
+			goto restart;
+		}
+		snes_reset_prev = snes_reset_now;
+	}
+	// FPGA TEST FAIL. PANIC.
+	led_panic();
+
+/* HERE BE LIONS */
+while(1)  {	
+	set_avr_addr(0x600000);
+	spi_fpga();
+	spiTransferByte(0x81); // read w/ increment... hopefully
+	spiTransferByte(0x00); // 1 dummy read
+	uart_putcrlf();
+	uint8_t buff[21];
+	for(uint8_t cnt=0; cnt<21; cnt++) {
+		uint8_t data=spiTransferByte(0x00);
+		buff[cnt]=data;
+	}
+	for(uint8_t cnt=0; cnt<21; cnt++) {
+		uint8_t data = buff[cnt];
+		_delay_ms(2);
+		if(data>=0x20 && data <= 0x7a) {
+			uart_putc(data);
+		} else {
+//			uart_putc('.');
+			uart_putc("0123456789ABCDEF"[data>>4]);
+			uart_putc("0123456789ABCDEF"[data&15]);
+			uart_putc(' ');
+		}
+//		set_avr_bank(3);
+	}
+	spi_none();
+}
+		while(1);
+}
+

mk1-src/memory.c

@@ -0,0 +1,335 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   memory.c: RAM operations
+*/
+
+#include <stdint.h>
+#include <avr/pgmspace.h>
+#include <util/delay.h>
+#include "config.h"
+#include "uart.h"
+#include "fpga.h"
+#include "crc16.h"
+#include "ff.h"
+#include "fileops.h"
+#include "spi.h"
+#include "fpga_spi.h"
+#include "avrcompat.h"
+#include "led.h"
+#include "smc.h"
+#include "fpga_spi.h"
+#include "memory.h"
+#include "snes.h"
+
+char* hex = "0123456789ABCDEF";
+
+void sram_hexdump(uint32_t addr, uint32_t len) {
+	static uint8_t buf[16];
+	uint32_t ptr;
+	for(ptr=0; ptr < len; ptr += 16) {
+		sram_readblock((void*)buf, ptr+addr, 16);
+		uart_trace(buf, 0, 16);
+	}
+}
+
+void sram_writebyte(uint8_t val, uint32_t addr) {
+	set_avr_addr(addr);
+	spi_fpga();
+	spiTransferByte(0x91); // WRITE
+	spiTransferByte(val);
+	spiTransferByte(0x00); // dummy
+	spi_none();
+}
+
+uint8_t sram_readbyte(uint32_t addr) {
+	set_avr_addr(addr);
+	spi_fpga();
+	spiTransferByte(0x81); // READ
+	spiTransferByte(0x00); // dummy
+	uint8_t val = spiTransferByte(0x00);
+	spi_none();
+	return val;
+}
+
+void sram_writeshort(uint16_t val, uint32_t addr) {
+	set_avr_addr(addr);
+	spi_fpga();
+	spiTransferByte(0x91); // WRITE
+	spiTransferByte(val&0xff);		// 7-0
+	spiTransferByte((val>>8)&0xff);		// 15-8
+	spiTransferByte(0x00); // dummy
+	spi_none();
+}
+
+void sram_writelong(uint32_t val, uint32_t addr) {
+	set_avr_addr(addr);
+	spi_fpga();
+	spiTransferByte(0x91); // WRITE
+	spiTransferByte(val&0xff);		// 7-0
+	spiTransferByte((val>>8)&0xff);		// 15-8
+	spiTransferByte((val>>16)&0xff);	// 23-15
+	spiTransferByte((val>>24)&0xff);	// 31-24
+	spiTransferByte(0x00); // dummy
+	spi_none();
+}
+
+uint16_t sram_readshort(uint32_t addr) {
+	set_avr_addr(addr);
+	spi_fpga();
+	spiTransferByte(0x81);
+	spiTransferByte(0x00);
+
+	uint32_t val = spiTransferByte(0x00);
+	val |= ((uint32_t)spiTransferByte(0x00)<<8);
+	spi_none();
+	return val;
+}
+
+uint32_t sram_readlong(uint32_t addr) {
+	set_avr_addr(addr);
+	spi_fpga();
+	spiTransferByte(0x81);
+	spiTransferByte(0x00);
+	uint32_t count=0;
+	uint32_t val = spiTransferByte(count & 0xff);
+	count++;
+	val |= ((uint32_t)spiTransferByte(count & val)<<8);
+	count++;
+	val |= ((uint32_t)spiTransferByte(count & val)<<16);
+	count++;
+	val |= ((uint32_t)spiTransferByte(count & val)<<24);
+	count++;
+	spi_none();
+	return val;
+}
+
+void sram_readblock(void* buf, uint32_t addr, uint16_t size) {
+	uint16_t count=size;
+	uint8_t* tgt = buf;
+	set_avr_addr(addr);
+	spi_fpga();
+	spiTransferByte(0x81);	// READ
+	spiTransferByte(0x00);	// dummy
+	while(count--) {
+		*(tgt++) = spiTransferByte(0x00);
+	}
+	spi_none();
+}
+
+void sram_writeblock(void* buf, uint32_t addr, uint16_t size) {
+	uint16_t count=size;
+	uint8_t* src = buf;
+	set_avr_addr(addr);
+	spi_fpga();
+	spiTransferByte(0x91);	// WRITE 
+	while(count--) {
+		spiTransferByte(*src++);
+	}
+	spiTransferByte(0x00);	// dummy
+	spi_none();
+}
+
+uint32_t load_rom(uint8_t* filename, uint32_t base_addr) {
+//	uint8_t dummy;
+	UINT bytes_read;
+	DWORD filesize;
+	UINT count=0;
+	file_open(filename, FA_READ);
+	filesize = file_handle.fsize;
+	smc_id(&romprops);
+	set_avr_addr(base_addr);
+	dprintf("no nervous breakdown beyond this point! or else!\n");
+	if(file_res) {
+		uart_putc('?');
+		uart_putc(0x30+file_res);
+		return 0;
+	}
+	f_lseek(&file_handle, romprops.offset);
+	spi_none();
+	for(;;) {
+		SPI_OFFLOAD=1;
+		spi_none();
+		bytes_read = file_read();
+		if (file_res || !bytes_read) break;
+		if(!(count++ % 8)) {
+//			toggle_busy_led();
+			bounce_busy_led();
+			uart_putc('.');
+		}
+/*		spi_fpga();
+		spiTransferByte(0x91); // write w/ increment
+		if(!(count++ % 8)) {
+//			toggle_busy_led();
+			bounce_busy_led();
+			uart_putc('.');
+		}
+		for(int j=0; j<bytes_read; j++) {
+//			spiTransferByte(file_buf[j]);
+			SPDR = file_buf[j];
+			loop_until_bit_is_set(SPSR, SPIF);
+			dummy = SPDR;
+		}
+		spiTransferByte(0x00); // dummy tx for increment+write pulse		*/
+	}
+	file_close();
+	spi_none();
+	set_avr_mapper(romprops.mapper_id);
+	uart_puthex(romprops.header.map);
+	uart_putc(0x30+romprops.mapper_id);
+
+	uint32_t rammask;
+	uint32_t rommask;
+	
+	if(filesize > (romprops.romsize_bytes + romprops.offset)) {
+		romprops.romsize_bytes <<= 1;
+	}
+
+	if(romprops.header.ramsize == 0) {
+		rammask = 0;
+	} else {
+		rammask = romprops.ramsize_bytes - 1;
+	}
+	rommask = romprops.romsize_bytes - 1;
+
+	uart_putc(' ');
+	uart_puthex(romprops.header.ramsize);
+	uart_putc('-');
+	uart_puthexlong(rammask);
+	uart_putc(' ');
+	uart_puthex(romprops.header.romsize);
+	uart_putc('-');
+	uart_puthexlong(rommask);
+	set_saveram_mask(rammask);
+	set_rom_mask(rommask);
+
+	return (uint32_t)filesize;
+}
+
+uint32_t load_sram(uint8_t* filename, uint32_t base_addr) {
+	set_avr_addr(base_addr);
+	UINT bytes_read;
+	DWORD filesize;
+	file_open(filename, FA_READ);
+	filesize = file_handle.fsize;
+	if(file_res) return 0;
+	for(;;) {
+//		FPGA_SS_HIGH();
+//		SPI_SS_LOW();
+		SPI_OFFLOAD=1;
+		bytes_read = file_read();
+//		SPI_SS_HIGH();
+		if (file_res || !bytes_read) break;
+//		FPGA_SS_LOW();
+/*		spiTransferByte(0x91);
+		for(int j=0; j<bytes_read; j++) {
+			spiTransferByte(file_buf[j]);
+		}
+		spiTransferByte(0x00); // dummy tx
+		FPGA_SS_HIGH(); // */
+	}
+	file_close();
+	return (uint32_t)filesize;
+}
+
+
+void save_sram(uint8_t* filename, uint32_t sram_size, uint32_t base_addr) {
+	uint32_t count = 0;
+	uint32_t num = 0;
+
+	spi_none();
+	file_open(filename, FA_CREATE_ALWAYS | FA_WRITE);
+	if(file_res) {
+		uart_putc(0x30+file_res);
+	}
+	while(count<sram_size) {
+		set_avr_addr(base_addr+count);
+		spi_fpga();
+		spiTransferByte(0x81); // read
+		spiTransferByte(0); // dummy
+		for(int j=0; j<sizeof(file_buf); j++) {
+			file_buf[j] = spiTransferByte(0x00);
+			count++;
+		}
+		spi_none();
+		num = file_write();
+		if(file_res) {
+			uart_putc(0x30+file_res);
+		}
+	}
+	file_close();
+}
+
+
+uint32_t calc_sram_crc(uint32_t base_addr, uint32_t size) {
+	uint8_t data;
+	uint32_t count;
+	uint16_t crc;
+	crc=0;
+	crc_valid=1;
+	set_avr_addr(base_addr);
+	spi_fpga();
+	spiTransferByte(0x81);
+	spiTransferByte(0x00);
+	for(count=0; count<size; count++) {
+		data = spiTransferByte(0);
+		if(get_snes_reset()) {
+			crc_valid = 0;
+			break;
+		}
+		crc += crc16_update(crc, &data, 1);
+	}
+	spi_none();
+	return crc;
+}
+
+uint8_t sram_reliable() {
+	uint16_t score=0;
+	uint32_t val;
+//	uint32_t val = sram_readlong(SRAM_SCRATCHPAD);
+	uint8_t result = 0;
+/*	while(score<SRAM_RELIABILITY_SCORE) {
+		if(sram_readlong(SRAM_SCRATCHPAD)==val) {
+			score++;
+		} else {
+			set_pwr_led(0);
+			score=0;
+		}
+	}*/
+	for(uint16_t i = 0; i < SRAM_RELIABILITY_SCORE; i++) {
+		val=sram_readlong(SRAM_SCRATCHPAD);
+		if(val==0x12345678) {
+			score++;
+//		} else {
+//			dprintf("i=%d val=%08lX\n", i, val);
+		}
+	}
+	if(score<SRAM_RELIABILITY_SCORE) {
+		result = 0;
+//		dprintf("score=%d\n", score);
+	} else {
+		result = 1;
+	}
+	set_pwr_led(result);
+	return result;
+}

mk1-src/memory.h

@@ -0,0 +1,60 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   memory.h: RAM operations
+*/
+
+#ifndef MEMORY_H
+#define MEMORY_H
+
+#define SRAM_ROM_ADDR (0x000000L)
+#define SRAM_SAVE_ADDR (0x600000L)
+
+#define SRAM_MENU_ADDR (0x600000L)
+#define SRAM_DB_ADDR (0x620000L)
+#define SRAM_DIR_ADDR (0x610000L)
+#define SRAM_CMD_ADDR (0x7F1004L)
+#define SRAM_FD_ADDR (0x7F1000L)
+#define SRAM_MENU_SAVE_ADDR (0x7F0000L)
+#define SRAM_SCRATCHPAD (0x7FFF00L)
+#define SRAM_DIRID (0x7FFFF0L)
+#define SRAM_RELIABILITY_SCORE (0x100)
+
+	uint32_t load_rom(uint8_t* filename, uint32_t base_addr);
+	uint32_t load_sram(uint8_t* filename, uint32_t base_addr);
+	void sram_hexdump(uint32_t addr, uint32_t len);
+	uint8_t sram_readbyte(uint32_t addr);
+	uint16_t sram_readshort(uint32_t addr);
+	uint32_t sram_readlong(uint32_t addr);
+	void sram_writebyte(uint8_t val, uint32_t addr);
+	void sram_writeshort(uint16_t val, uint32_t addr);
+	void sram_writelong(uint32_t val, uint32_t addr);
+	void sram_readblock(void* buf, uint32_t addr, uint16_t size);
+	void sram_writeblock(void* buf, uint32_t addr, uint16_t size);
+	void save_sram(uint8_t* filename, uint32_t sram_size, uint32_t base_addr);
+	uint32_t calc_sram_crc(uint32_t base_addr, uint32_t size);
+	uint8_t sram_reliable(void);
+
+#include "smc.h"
+	snes_romprops_t romprops;
+#endif

mk1-src/sdcard.c

@@ -0,0 +1,773 @@
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   sdcard.c: SD/MMC access routines
+
+   Extended, optimized and cleaned version of code from MMC2IEC,
+   original copyright header follows:
+
+//
+// Title        : SD/MMC Card driver
+// Author       : Lars Pontoppidan, Aske Olsson, Pascal Dufour,
+// Date         : Jan. 2006
+// Version      : 0.42
+// Target MCU   : Atmel AVR Series
+//
+// CREDITS:
+// This module is developed as part of a project at the technical univerisity of
+// Denmark, DTU.
+//
+// DESCRIPTION:
+// This SD card driver implements the fundamental communication with a SD card.
+// The driver is confirmed working on 8 MHz and 14.7456 MHz AtMega32 and has
+// been tested successfully with a large number of different SD and MMC cards.
+//
+// DISCLAIMER:
+// The author is in no way responsible for any problems or damage caused by
+// using this code. Use at your own risk.
+//
+// LICENSE:
+// This code is distributed under the GNU Public License
+// which can be found at http://www.gnu.org/licenses/gpl.txt
+//
+
+  The exported functions in this file are weak-aliased to their corresponding
+  versions defined in diskio.h so when this file is the only diskio provider
+  compiled in they will be automatically used by the linker.
+
+*/
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+#include <util/crc16.h>
+#include <util/delay.h>
+#include "config.h"
+#include "avrcompat.h"
+#include "crc7.h"
+#include "diskio.h"
+#include "spi.h"
+#include "uart.h"
+#include "sdcard.h"
+#include "fpga_spi.h"
+#ifndef TRUE
+#define TRUE -1
+#endif
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifdef CONFIG_TWINSD
+#  define MAX_CARDS 2
+#else
+#  define MAX_CARDS 1
+#endif
+
+// SD/MMC commands
+#define GO_IDLE_STATE           0
+#define SEND_OP_COND            1
+#define SWITCH_FUNC             6
+#define SEND_IF_COND            8
+#define SEND_CSD                9
+#define SEND_CID               10
+#define STOP_TRANSMISSION      12
+#define SEND_STATUS            13
+#define SET_BLOCKLEN           16
+#define READ_SINGLE_BLOCK      17
+#define READ_MULTIPLE_BLOCK    18
+#define WRITE_BLOCK            24
+#define WRITE_MULTIPLE_BLOCK   25
+#define PROGRAM_CSD            27
+#define SET_WRITE_PROT         28
+#define CLR_WRITE_PROT         29
+#define SEND_WRITE_PROT        30
+#define ERASE_WR_BLK_STAR_ADDR 32
+#define ERASE_WR_BLK_END_ADDR  33
+#define ERASE                  38
+#define LOCK_UNLOCK            42
+#define APP_CMD                55
+#define GEN_CMD                56
+#define READ_OCR               58
+#define CRC_ON_OFF             59
+
+// SD ACMDs
+#define SD_STATUS                 13
+#define SD_SEND_NUM_WR_BLOCKS     22
+#define SD_SET_WR_BLK_ERASE_COUNT 23
+#define SD_SEND_OP_COND           41
+#define SD_SET_CLR_CARD_DETECT    42
+#define SD_SEND_SCR               51
+
+// R1 status bits
+#define STATUS_IN_IDLE          1
+#define STATUS_ERASE_RESET      2
+#define STATUS_ILLEGAL_COMMAND  4
+#define STATUS_CRC_ERROR        8
+#define STATUS_ERASE_SEQ_ERROR 16
+#define STATUS_ADDRESS_ERROR   32
+#define STATUS_PARAMETER_ERROR 64
+
+
+/* Card types - cardtype == 0 is MMC */
+#define CARD_SD   (1<<0)
+#define CARD_SDHC (1<<1)
+
+static uint8_t cardtype[MAX_CARDS];
+
+/**
+ * getbits - read value from bit buffer
+ * @buffer: pointer to the data buffer
+ * @start : index of the first bit in the value
+ * @bits  : number of bits in the value
+ *
+ * This function returns a value from the memory region passed as
+ * buffer, starting with bit "start" and "bits" bit long. The buffer
+ * is assumed to be MSB first, passing 0 for start will read starting
+ * from the highest-value bit of the first byte of the buffer.
+ */
+static uint32_t getbits(void *buffer, uint16_t start, int8_t bits) {
+  uint8_t *buf = buffer;
+  uint32_t result = 0;
+
+  if ((start % 8) != 0) {
+    /* Unaligned start */
+    result += buf[start / 8] & (0xff >> (start % 8));
+    bits  -= 8 - (start % 8);
+    start += 8 - (start % 8);
+  }
+  while (bits >= 8) {
+    result = (result << 8) + buf[start / 8];
+    start += 8;
+    bits -= 8;
+  }
+  if (bits > 0) {
+    result = result << bits;
+    result = result + (buf[start / 8] >> (8-bits));
+  } else if (bits < 0) {
+    /* Fraction of a single byte */
+    result = result >> -bits;
+  }
+  return result;
+}
+
+static uint8_t sdResponse(uint8_t expected)
+{
+  unsigned short count = 0x0FFF;
+
+  while ((spiTransferByte(0xFF) != expected) && count )
+    count--;
+
+  // If count didn't run out, return success
+  return (count != 0);
+}
+
+static uint8_t sdWaitWriteFinish(void)
+{
+  uint32_t count = 0x1FFFF; // wait for quite some time
+  
+  while ((spiTransferByte(0xFF) == 0) && count )
+    count--;
+
+  // If count didn't run out, return success
+  return (count != 0);
+}
+
+static void deselectCard(uint8_t card) {
+  // Send 8 clock cycles
+  SPI_SS_HIGH(card);
+  spiTransferByte(0xff);
+}
+
+/**
+ * sendCommand - send a command to the SD card
+ * @card     : card number to be accessed
+ * @command  : command to be sent
+ * @parameter: parameter to be sent
+ * @deselect : Flags if the card should be deselected afterwards
+ *
+ * This function calculates the correct CRC7 for the command and
+ * parameter and transmits all of it to the SD card. If requested
+ * the card will be deselected afterwards.
+ */
+static int sendCommand(const uint8_t  card,
+                       const uint8_t  command,
+                       const uint32_t parameter,
+                       const uint8_t  deselect) {
+  union {
+    uint32_t l;
+    uint8_t  c[4];
+  } long2char;
+
+  uint8_t  i,crc=0,errorcount;
+  uint16_t counter;
+
+  long2char.l = parameter;
+  crc = crc7update(0  , 0x40+command);
+  crc = crc7update(crc, long2char.c[3]);
+  crc = crc7update(crc, long2char.c[2]);
+  crc = crc7update(crc, long2char.c[1]);
+  crc = crc7update(crc, long2char.c[0]);
+  crc = (crc << 1) | 1;
+
+  errorcount = 0;
+  while (errorcount < CONFIG_SD_AUTO_RETRIES) {
+    // Select card
+    SPI_SS_LOW(card);
+#ifdef CONFIG_TWINSD
+    if (card == 0 && command == GO_IDLE_STATE)
+      /* Force both cards to SPI mode simultaneously */
+      SPI_SS_LOW(1);
+#endif
+
+    // Transfer command
+    spiTransferByte(0x40+command);
+    spiTransferLong(parameter);
+    spiTransferByte(crc);
+
+    // Wait for a valid response
+    counter = 0;
+    do {
+      i = spiTransferByte(0xff);
+      counter++;
+    } while (i & 0x80 && counter < 0x1000);
+
+#ifdef CONFIG_TWINSD
+    if (card == 0 && command == GO_IDLE_STATE)
+      SPI_SS_HIGH(1);
+#endif
+
+    // Check for CRC error
+    // can't reliably retry unless deselect is allowed
+    if (deselect && (i & STATUS_CRC_ERROR)) {
+      uart_putc('x');
+      deselectCard(card);
+      errorcount++;
+      continue;
+    }
+
+    if (deselect) deselectCard(card);
+    break;
+  }
+
+  return i;
+}
+
+// Extended init sequence for SDHC support
+static uint8_t extendedInit(const uint8_t card) {
+  uint8_t  i;
+  uint32_t answer;
+  // Send CMD8: SEND_IF_COND
+  //   0b000110101010 == 2.7-3.6V supply, check pattern 0xAA
+  i = sendCommand(card, SEND_IF_COND, 0b000110101010, 0);
+  if (i > 1) {
+    // Card returned an error, ok (MMC oder SD1.x) but not SDHC
+    deselectCard(card);
+    return TRUE;
+  }
+
+  // No error, continue SDHC initialization
+  answer = spiTransferLong(0);
+  deselectCard(card);
+
+  if (((answer >> 8) & 0x0f) != 0b0001) {
+    // Card didn't accept our voltage specification
+    return FALSE;
+  }
+
+  // Verify echo-back of check pattern
+  if ((answer & 0xff) != 0b10101010) {
+    // Check pattern mismatch, working but not SD2.0 compliant
+    // The specs say we should not use the card, but let's try anyway.
+    return TRUE;
+  }
+
+  return TRUE;
+}
+
+// SD common initialisation
+static void sdInit(const uint8_t card) {
+  uint8_t i;
+  uint16_t counter;
+
+  SD_SPI_OFFLOAD = 0;
+
+  counter = 0xffff;
+  do {
+    // Prepare for ACMD, send CMD55: APP_CMD
+    i = sendCommand(card, APP_CMD, 0, 1);
+    if (i > 1)
+      // Command not accepted, could be MMC
+      return;
+
+    // Send ACMD41: SD_SEND_OP_COND
+    //   1L<<30 == Host has High Capacity Support
+    i = sendCommand(card, SD_SEND_OP_COND, 1L<<30, 1);
+    // Repeat while card card accepts command but isn't ready
+  } while (i == 1 && --counter > 0);
+
+  // Ignore failures, there is at least one Sandisk MMC card
+  // that accepts CMD55, but not ACMD41.
+  if (i == 0)
+    /* We know that a card is SD if ACMD41 was accepted. */
+    cardtype[card] |= CARD_SD;
+}
+
+/* Detect changes of SD card 0 */
+#ifdef SD_CHANGE_VECT
+ISR(SD_CHANGE_VECT) {
+  if (SDCARD_DETECT)
+    disk_state = DISK_CHANGED;
+  else
+    disk_state = DISK_REMOVED;
+}
+#endif
+
+#ifdef CONFIG_TWINSD
+/* Detect changes of SD card 1 */
+ISR(SD2_CHANGE_VECT) {
+  if (SD2_DETECT)
+    disk_state = DISK_CHANGED;
+  else
+    disk_state = DISK_REMOVED;
+}
+#endif
+
+//
+// Public functions
+//
+void sd_init(void) {
+  SDCARD_DETECT_SETUP();
+  SDCARD_WP_SETUP();
+  SD_CHANGE_SETUP();
+#ifdef CONFIG_TWINSD
+  /* Initialize the control lines for card 2 */
+  SD2_SETUP();
+  SD2_CHANGE_SETUP();
+#endif
+}
+void disk_init(void) __attribute__ ((weak, alias("sd_init")));
+
+
+DSTATUS sd_status(BYTE drv) {
+#ifdef CONFIG_TWINSD
+  if (drv != 0) {
+    if (SD2_DETECT) {
+      if (SD2_PIN & SD2_WP) {
+        return STA_PROTECT;
+      } else {
+        return RES_OK;
+      }
+    } else {
+      return STA_NOINIT|STA_NODISK;
+    }
+  } else
+#endif
+  if (SDCARD_DETECT) {
+//	uart_putc('0');
+    if (SDCARD_WP) {
+//	  uart_putc('1');
+      return STA_PROTECT;
+    } else {
+//	  uart_putc('2');
+      return RES_OK;
+    }
+  } else {
+//    uart_putc('3');
+    return STA_NOINIT|STA_NODISK;
+  }
+}
+DSTATUS disk_status(BYTE drv) __attribute__ ((weak, alias("sd_status")));
+
+
+/**
+ * sd_initialize - initialize SD card
+ * @drv   : drive
+ *
+ * This function tries to initialize the selected SD card.
+ */
+DSTATUS sd_initialize(BYTE drv) {
+  uint8_t  i;
+  uint16_t counter;
+  uint32_t answer;
+
+  if (drv >= MAX_CARDS)
+    return STA_NOINIT|STA_NODISK;
+
+  /* Don't bother initializing a card that isn't there */
+//  uart_putc('#');
+  if (sd_status(drv) & STA_NODISK)
+    return sd_status(drv);
+
+  /* JLB: Should be in sd_init, but some uIEC versions have
+   * IEC lines tied to SPI, so I moved it here to resolve the
+   * conflict.
+   */
+  spiInit();
+
+  disk_state = DISK_ERROR;
+
+  cardtype[drv] = 0;
+
+  SPI_SS_HIGH(drv);
+
+  // Send 80 clks
+  for (i=0; i<10; i++) {
+    spiTransferByte(0xFF);
+  }
+
+  // Reset card
+  i = sendCommand(drv, GO_IDLE_STATE, 0, 1);
+  if (i != 1) {
+    return STA_NOINIT | STA_NODISK;
+  }
+
+  if (!extendedInit(drv))
+    return STA_NOINIT | STA_NODISK;
+
+  sdInit(drv);
+
+  counter = 0xffff;
+  // According to the spec READ_OCR should work at this point
+  // without retries. One of my Sandisk-cards thinks otherwise.
+  do {
+    // Send CMD58: READ_OCR
+    i = sendCommand(drv, READ_OCR, 0, 0);
+    if (i > 1)
+      deselectCard(drv);
+  } while (i > 1 && counter-- > 0);
+
+  if (counter > 0) {
+    answer = spiTransferLong(0);
+
+    // See if the card likes our supply voltage
+    if (!(answer & SD_SUPPLY_VOLTAGE)) {
+      // The code isn't set up to completely ignore the card,
+      // but at least report it as nonworking
+      deselectCard(drv);
+      return STA_NOINIT | STA_NODISK;
+    }
+
+    // See what card we've got
+    if (answer & 0x40000000) {
+      cardtype[drv] |= CARD_SDHC;
+    }
+  }
+
+  // Keep sending CMD1 (SEND_OP_COND) command until zero response
+  counter = 0xffff;
+  do {
+    i = sendCommand(drv, SEND_OP_COND, 1L<<30, 1);
+    counter--;
+  } while (i != 0 && counter > 0);
+
+  if (counter==0) {
+    return STA_NOINIT | STA_NODISK;
+  }
+
+#ifdef CONFIG_SD_DATACRC
+  // Enable CRC checking
+  // The SD spec says that the host "should" send CRC_ON_OFF before ACMD_SEND_OP_COND.
+  // The MMC manual I have says that CRC_ON_OFF isn't allowed before SEND_OP_COND.
+  // Let's just hope that all SD cards work with this order. =(
+  i = sendCommand(drv, CRC_ON_OFF, 1, 1);
+  if (i > 1) {
+    return STA_NOINIT | STA_NODISK;
+  }
+#endif
+
+  // Send MMC CMD16(SET_BLOCKLEN) to 512 bytes
+  i = sendCommand(drv, SET_BLOCKLEN, 512, 1);
+  if (i != 0) {
+    return STA_NOINIT | STA_NODISK;
+  }
+
+  // Thats it!
+  disk_state = DISK_OK;
+  return sd_status(drv);
+}
+DSTATUS disk_initialize(BYTE drv) __attribute__ ((weak, alias("sd_initialize")));
+
+
+/**
+ * sd_read - reads sectors from the SD card to buffer
+ * @drv   : drive
+ * @buffer: pointer to the buffer
+ * @sector: first sector to be read
+ * @count : number of sectors to be read
+ *
+ * This function reads count sectors from the SD card starting
+ * at sector to buffer. Returns RES_ERROR if an error occured or
+ * RES_OK if successful. Up to SD_AUTO_RETRIES will be made if
+ * the calculated data CRC does not match the one sent by the
+ * card. If there were errors during the command transmission
+ * disk_state will be set to DISK_ERROR and no retries are made.
+ */
+DRESULT sd_read(BYTE drv, BYTE *buffer, DWORD sector, BYTE count) {
+  uint8_t sec,res,tmp,errorcount;
+  uint16_t crc,recvcrc;
+  if (drv >= MAX_CARDS)
+    return RES_PARERR;
+
+  for (sec=0;sec<count;sec++) {
+    errorcount = 0;
+    while (errorcount < CONFIG_SD_AUTO_RETRIES) {
+      if (cardtype[drv] & CARD_SDHC)
+        res = sendCommand(drv, READ_SINGLE_BLOCK, sector+sec, 0);
+      else
+        res = sendCommand(drv, READ_SINGLE_BLOCK, (sector+sec) << 9, 0);
+
+      if (res != 0) {
+		uart_putc('?');
+	dprintf("SD error: %02x\n", res);
+        SPI_SS_HIGH(drv);
+        disk_state = DISK_ERROR;
+        return RES_ERROR;
+      }
+
+      // Wait for data token
+      if (!sdResponse(0xFE)) {
+		uart_putc('-');
+        SPI_SS_HIGH(drv);
+        disk_state = DISK_ERROR;
+        return RES_ERROR;
+      }
+
+      uint16_t i;
+#ifdef CONFIG_SD_DATACRC
+      BYTE *oldbuffer = buffer;
+#endif
+
+      // Get data
+      crc = 0;
+
+      if(SD_SPI_OFFLOAD) {
+//	uart_putc('O');
+        PORTB |= _BV(PB2);
+        DDRB |= _BV(PB2);
+	_delay_us(1);
+        PORTB &= ~_BV(PB2);
+        DDRB &= ~_BV(PB7); // tristate SCK
+        PORTB |= _BV(PB2);
+        DDRB &= ~_BV(PB2);
+	_delay_us(1);
+	while(!(PINB & _BV(PB2)));
+        DDRB |= _BV(PB7);
+        DDRB |= _BV(PB2);
+//	_delay_us(1);
+	deselectCard(drv);
+	SD_SPI_OFFLOAD = 0;
+	return RES_OK;
+        SPDR = 0xff;
+      } else {
+        // Initiate data exchange over SPI
+        SPDR = 0xff;
+  
+        for (i=0; i<512; i++) {
+          // Wait until data has been received
+          loop_until_bit_is_set(SPSR, SPIF);
+          tmp = SPDR;
+          // Transmit the next byte while we store the current one
+          SPDR = 0xff;
+  
+          *(buffer++) = tmp;
+#ifdef CONFIG_SD_DATACRC
+          crc = _crc_xmodem_update(crc, tmp);
+#endif
+        }
+      }
+      // Wait until the first CRC byte is received
+      loop_until_bit_is_set(SPSR, SPIF);
+  
+      // Check CRC
+      recvcrc = (SPDR << 8) + spiTransferByte(0xff);
+#ifdef CONFIG_SD_DATACRC
+      if (recvcrc != crc) {
+        uart_putc('X');
+        deselectCard(drv);
+        errorcount++;
+        buffer = oldbuffer;
+        continue;
+      }
+#endif
+      break;
+    }
+    deselectCard(drv);
+
+    if (errorcount >= CONFIG_SD_AUTO_RETRIES) return RES_ERROR;
+  }
+  return RES_OK;
+}
+DRESULT disk_read(BYTE drv, BYTE *buffer, DWORD sector, BYTE count) __attribute__ ((weak, alias("sd_read")));
+
+
+
+/**
+ * sd_write - writes sectors from buffer to the SD card
+ * @drv   : drive
+ * @buffer: pointer to the buffer
+ * @sector: first sector to be written
+ * @count : number of sectors to be written
+ *
+ * This function writes count sectors from buffer to the SD card
+ * starting at sector. Returns RES_ERROR if an error occured,
+ * RES_WPRT if the card is currently write-protected or RES_OK
+ * if successful. Up to SD_AUTO_RETRIES will be made if the card
+ * signals a CRC error. If there were errors during the command
+ * transmission disk_state will be set to DISK_ERROR and no retries
+ * are made.
+ */
+DRESULT sd_write(BYTE drv, const BYTE *buffer, DWORD sector, BYTE count) {
+  uint8_t res,sec,errorcount,status;
+  uint16_t crc;
+
+  if (drv >= MAX_CARDS)
+    return RES_PARERR;
+
+#ifdef CONFIG_TWINSD
+  if (drv != 0) {
+    if (SD2_PIN & SD2_WP)
+      return RES_WRPRT;
+  } else
+#endif
+
+  if (SDCARD_WP) return RES_WRPRT;
+
+  for (sec=0;sec<count;sec++) {
+    errorcount = 0;
+    while (errorcount < CONFIG_SD_AUTO_RETRIES) {
+      if (cardtype[drv] & CARD_SDHC)
+        res = sendCommand(drv, WRITE_BLOCK, sector+sec, 0);
+      else
+        res = sendCommand(drv, WRITE_BLOCK, (sector+sec)<<9, 0);
+
+      if (res != 0) {
+	uart_putc('C');
+        SPI_SS_HIGH(drv);
+        disk_state = DISK_ERROR;
+        return RES_ERROR;
+      }
+
+      // Send data token
+      spiTransferByte(0xFE);
+
+      uint16_t i;
+      const BYTE *oldbuffer = buffer;
+
+      // Send data
+      crc = 0;
+      for (i=0; i<512; i++) {
+#ifdef CONFIG_SD_DATACRC
+        crc = _crc_xmodem_update(crc, *buffer);
+#endif
+        spiTransferByte(*(buffer++));
+      }
+
+      // Send CRC
+      spiTransferByte(crc >> 8);
+      spiTransferByte(crc & 0xff);
+
+      // Get and check status feedback
+      status = spiTransferByte(0xFF);
+
+      // Retry if neccessary
+      if ((status & 0x0F) != 0x05) {
+        uart_putc('X');
+        deselectCard(drv);
+        errorcount++;
+        buffer = oldbuffer;
+        continue;
+      }
+
+      // Wait for write finish
+      if (!sdWaitWriteFinish()) {
+	uart_putc('W');
+        SPI_SS_HIGH(drv);
+        disk_state = DISK_ERROR;
+        return RES_ERROR;
+      }
+      break;
+    }
+    deselectCard(drv);
+
+    if (errorcount >= CONFIG_SD_AUTO_RETRIES) {
+      if (!(status & STATUS_CRC_ERROR))
+        disk_state = DISK_ERROR;
+      return RES_ERROR;
+    }
+  }
+
+  return RES_OK;
+}
+DRESULT disk_write(BYTE drv, const BYTE *buffer, DWORD sector, BYTE count) __attribute__ ((weak, alias("sd_write")));
+
+DRESULT sd_getinfo(BYTE drv, BYTE page, void *buffer) {
+  uint8_t i;
+  uint8_t buf[18];
+  uint32_t capacity;
+
+  if (drv >= MAX_CARDS)
+    return RES_NOTRDY;
+
+  if (sd_status(drv) & STA_NODISK)
+    return RES_NOTRDY;
+
+  if (page != 0)
+    return RES_ERROR;
+
+  /* Try to calculate the total number of sectors on the card */
+  /* FIXME: Write a generic data read function and merge with sd_read */
+  if (sendCommand(drv, SEND_CSD, 0, 0) != 0) {
+    deselectCard(drv);
+    return RES_ERROR;
+  }
+
+  /* Wait for data token */
+  if (!sdResponse(0xfe)) {
+    deselectCard(drv);
+    return RES_ERROR;
+  }
+
+  for (i=0;i<18;i++) {
+    buf[i] = spiTransferByte(0xff);
+  }
+  deselectCard(drv);
+
+  if (cardtype[drv] & CARD_SDHC) {
+    /* Special CSD for SDHC cards */
+    capacity = (1 + getbits(buf,127-69,22)) * 1024;
+  } else {
+    /* Assume that MMC-CSD 1.0/1.1/1.2 and SD-CSD 1.1 are the same... */
+    uint8_t exponent = 2 + getbits(buf, 127-49, 3);
+    capacity = 1 + getbits(buf, 127-73, 12);
+    exponent += getbits(buf, 127-83,4) - 9;
+    while (exponent--) capacity *= 2;
+  }
+
+  diskinfo0_t *di = buffer;
+  di->validbytes  = sizeof(diskinfo0_t);
+  di->disktype    = DISK_TYPE_SD;
+  di->sectorsize  = 2;
+  di->sectorcount = capacity;
+
+  return RES_OK;
+}
+DRESULT disk_getinfo(BYTE drv, BYTE page, void *buffer) __attribute__ ((weak, alias("sd_getinfo")));

mk1-src/sdcard.h

@@ -0,0 +1,40 @@
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   sdcard.h: Definitions for the SD/MMC access routines
+
+*/
+
+#ifndef SDCARD_H
+#define SDCARD_H
+
+#include "diskio.h"
+
+/* These functions are weak-aliased to disk_... */
+void    sd_init(void);
+DSTATUS sd_status(BYTE drv);
+DSTATUS sd_initialize(BYTE drv);
+DRESULT sd_read(BYTE drv, BYTE *buffer, DWORD sector, BYTE count);
+DRESULT sd_write(BYTE drv, const BYTE *buffer, DWORD sector, BYTE count);
+DRESULT sd_getinfo(BYTE drv, BYTE page, void *buffer);
+
+#endif

mk1-src/smc.c

@@ -0,0 +1,175 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   smc.c: SMC file related operations
+*/
+
+#include <avr/io.h>
+#include <util/delay.h>
+#include "fileops.h"
+#include "config.h"
+#include "uart.h"
+#include "smc.h"
+
+uint32_t hdr_addr[6] = {0xffb0, 0x101b0, 0x7fb0, 0x81b0, 0x40ffb0, 0x4101b0};
+uint8_t countAllASCII(uint8_t* data, int size) {
+	uint8_t res = 0;
+	do {
+		size--;
+		if(data[size] >= 0x20 && data[size] <= 0x7e) {
+			res++;
+		}
+	} while (size);
+	return res;
+}
+
+uint8_t countAllJISX0201(uint8_t* data, int size) {
+	uint8_t res = 0;
+	do {
+		size--;
+		if((data[size] >= 0x20 && data[size] <= 0x7e)
+           ||(data[size] >= 0xa1 && data[size] <= 0xdf)) {
+			res++;
+		}
+	} while (size);
+	return res;
+}
+
+uint8_t isFixed(uint8_t* data, int size, uint8_t value) {
+	uint8_t res = 1;
+	do {
+		size--;
+		if(data[size] != value) {
+			res = 0;
+		}
+	} while (size);
+	return res;
+}
+
+uint8_t checkChksum(uint16_t cchk, uint16_t chk) {
+	uint32_t sum = cchk + chk;
+	uint8_t res = 0;
+	if(sum==0x0000ffff) {
+		res = 0x10;
+	}
+	return res;
+}
+
+void smc_id(snes_romprops_t* props) {
+	uint8_t score, maxscore=1, score_idx=2; // assume LoROM
+
+	snes_header_t* header = &(props->header);
+	
+	for(uint8_t num = 0; num < 6; num++) {
+		if(!file_readblock(header, hdr_addr[num], sizeof(snes_header_t)) 
+		|| file_res) {
+//			dprintf("uh oh... %d\n", file_res);
+//			_delay_ms(30);
+			score = 0;
+		} else {
+			score = smc_headerscore(header)/(1+(num&1));
+			if((file_handle.fsize & 0x2ff) == 0x200) {
+				if(num&1) {
+					score+=20;
+				} else {
+					score=0;
+				}
+			} else {
+				if(!(num&1)) {
+					score+=20;
+				} else {
+					score=0;
+				}
+			}
+		}
+//		dprintf("%d: offset = %lX; score = %d\n", num, hdr_addr[num], score);
+//		_delay_ms(100);
+		if(score>=maxscore) {
+			score_idx=num;
+			maxscore=score;
+		}		
+	}
+
+	if(score_idx & 1) {
+		props->offset = 0x200;
+	} else {
+		props->offset = 0;
+	}
+	
+	// restore the chosen one
+//	dprintf("winner is %d\n", score_idx);
+//	_delay_ms(30);
+	file_readblock(header, hdr_addr[score_idx], sizeof(snes_header_t));
+	switch(header->map & 0xef) {
+		case 0x20:
+			props->mapper_id = 1;
+			break;
+		case 0x21:
+			props->mapper_id = 0;
+			break;
+		case 0x25:
+			props->mapper_id = 2;
+			break;
+		default: // invalid/unsupported mapper, use header location
+			switch(score_idx) {
+				case 0:
+				case 1:
+					props->mapper_id = 0;
+					break;
+				case 2:
+				case 3:
+					props->mapper_id = 1;
+					break;
+				case 4:
+				case 5:
+					props->mapper_id = 2;
+					break;
+				default:
+					props->mapper_id = 1; // whatever
+			}
+	}
+	if(header->romsize == 0 || header->romsize > 13) {
+		header->romsize = 13;
+	}
+	props->ramsize_bytes = (uint32_t)1024 << header->ramsize;
+	props->romsize_bytes = (uint32_t)1024 << header->romsize;
+	props->expramsize_bytes = (uint32_t)1024 << header->expramsize;
+//	dprintf("ramsize_bytes: %ld\n", props->ramsize_bytes);
+	if(props->ramsize_bytes > 32768 || props->ramsize_bytes < 2048) {
+		props->ramsize_bytes = 0;
+	}
+//	dprintf("ramsize_bytes: %ld\n", props->ramsize_bytes);
+	f_lseek(&file_handle, 0);
+}
+
+uint8_t smc_headerscore(snes_header_t* header) {
+	uint8_t score=0;
+	score += countAllASCII(header->maker, sizeof(header->maker));
+	score += countAllASCII(header->gamecode, sizeof(header->gamecode));
+	score += isFixed(header->fixed_00, sizeof(header->fixed_00), 0x00);
+	score += countAllJISX0201(header->name, sizeof(header->name));
+	score += 3*isFixed(&header->fixed_33, sizeof(header->fixed_33), 0x33);
+	score += checkChksum(header->cchk, header->chk);
+	return score;
+}
+

mk1-src/smc.h

@@ -0,0 +1,62 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   smc.h: SMC file structures
+*/
+
+#ifndef SMC_H
+#define SMC_H
+
+typedef struct _snes_header {
+	uint8_t maker[2];		// 0xB0
+	uint8_t gamecode[4];	// 0xB2
+	uint8_t fixed_00[7];	// 0xB6
+	uint8_t expramsize;		// 0xBD
+	uint8_t specver;		// 0xBE
+	uint8_t carttype2; 		// 0xBF
+	uint8_t name[21];		// 0xC0
+	uint8_t map;			// 0xD5
+	uint8_t carttype;		// 0xD6
+	uint8_t romsize;		// 0xD7
+	uint8_t ramsize;		// 0xD8
+	uint8_t destcode;		// 0xD9
+	uint8_t fixed_33;		// 0xDA
+	uint8_t ver;			// 0xDB
+	uint16_t cchk;			// 0xDC
+	uint16_t chk;			// 0xDE
+} snes_header_t;
+
+typedef struct _snes_romprops {
+	uint16_t offset;			// start of actual ROM image
+	uint8_t mapper_id;			// FPGA mapper
+	uint8_t pad1;				// for alignment
+	uint32_t expramsize_bytes;	// ExpRAM size in bytes
+	uint32_t ramsize_bytes;		// CartRAM size in bytes
+	uint32_t romsize_bytes;		// ROM size in bytes (rounded up)
+	snes_header_t header;		// original header from ROM image
+} snes_romprops_t;
+
+void smc_id(snes_romprops_t*);
+uint8_t smc_headerscore(snes_header_t*);
+
+#endif

mk1-src/snes.c

@@ -0,0 +1,146 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   snes.c: SNES hardware control and monitoring
+*/
+
+#include <avr/io.h>
+#include "avrcompat.h"
+#include "config.h"
+#include "uart.h"
+#include "snes.h"
+#include "memory.h"
+#include "fileops.h"
+#include "ff.h"
+#include "led.h"
+#include "smc.h"
+
+uint8_t initloop=1;
+uint32_t saveram_crc, saveram_crc_old;
+void snes_init() {
+	DDRD |= _BV(PD5);	// PD5 = RESET_DIR
+	DDRD |= _BV(PD6); 	// PD6 = RESET
+	snes_reset(1); 
+}
+
+/*
+ * sets the SNES reset state.
+ *
+ *  state: put SNES in reset state when 1, release when 0
+ */
+void snes_reset(int state) {
+	if(state) {
+		DDRD |= _BV(PD6);	// /RESET pin -> out
+		PORTD &= ~_BV(PD6);	// /RESET = 0
+		PORTD |= _BV(PD5);	// RESET_DIR = 1;
+	} else {
+		PORTD &= ~_BV(PD5);	// RESET_DIR = 0;
+		DDRD &= ~_BV(PD6);	// /RESET pin -> in
+		PORTD |= _BV(PD6);	// /RESET = pullup
+	}
+}
+
+/*
+ * gets the SNES reset state.
+ *
+ * returns: 1 when reset, 0 when not reset
+ */
+uint8_t get_snes_reset() {
+//	DDRD &= ~_BV(PD6);	// /RESET pin -> in
+//	PORTD &= ~_BV(PD5);	// RESET_DIR (external buffer) = 0
+	return !(PIND & _BV(PD6));
+}
+
+/*
+ * SD2SNES main loop.
+ * monitors SRAM changes and other things
+ */
+uint32_t diffcount = 0, samecount = 0, didnotsave = 0;
+uint8_t sram_valid = 0;
+void snes_main_loop() {
+	if(!romprops.ramsize_bytes)return;
+	if(initloop) {
+		saveram_crc_old = calc_sram_crc(SRAM_SAVE_ADDR, romprops.ramsize_bytes);
+		initloop=0;
+	}
+	saveram_crc = calc_sram_crc(SRAM_SAVE_ADDR, romprops.ramsize_bytes);
+	sram_valid = sram_reliable();
+	if(crc_valid && sram_valid) {
+		if(saveram_crc != saveram_crc_old) {
+			if(samecount) {
+				diffcount=1;
+			} else {
+				diffcount++;
+				didnotsave++;
+			}
+			samecount=0;
+		}
+		if(saveram_crc == saveram_crc_old) {
+			samecount++;
+		}
+		if(diffcount>=1 && samecount==5) {
+			uart_putc('U');
+			uart_puthexshort(saveram_crc);
+			uart_putcrlf();
+			set_busy_led(1);
+			save_sram(file_lfn, romprops.ramsize_bytes, SRAM_SAVE_ADDR);
+			set_busy_led(0);
+			didnotsave=0;
+		}
+		if(didnotsave>50) {
+			diffcount=0;
+			uart_putc('V');
+			set_busy_led(1);
+			save_sram(file_lfn, romprops.ramsize_bytes, SRAM_SAVE_ADDR);
+			didnotsave=0;	
+                        set_busy_led(0);
+		}
+		saveram_crc_old = saveram_crc;
+	}
+	dprintf("crc_valid=%d sram_valid=%d diffcount=%ld samecount=%ld, didnotsave=%ld\n", crc_valid, sram_valid, diffcount, samecount, didnotsave);
+}
+
+/*
+ * SD2SNES menu loop.
+ * monitors menu selection. return when selection was made.
+ */
+uint8_t menu_main_loop() {
+	uint8_t cmd = 0;
+	sram_writebyte(0, SRAM_CMD_ADDR);
+	while(!cmd) {
+		if(!get_snes_reset()) {
+			while(!sram_reliable());
+			cmd = sram_readbyte(SRAM_CMD_ADDR);
+		}
+		if(get_snes_reset()) {
+			cmd = 0;
+		}
+	}
+	return cmd;
+}
+
+void get_selected_name(uint8_t* fn) {
+	uint32_t addr = sram_readlong(SRAM_FD_ADDR);
+	dprintf("fd addr=%lX\n", addr);
+	sram_readblock(fn, addr+0x41+SRAM_MENU_ADDR, 256);
+}

mk1-src/snes.h

@@ -0,0 +1,37 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   AVR firmware portion
+
+   Inspired by and based on code from sd2iec, written by Ingo Korb et al.
+   See sdcard.c|h, config.h.
+
+   FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
+   see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   snes.h: SNES hardware control and monitoring
+*/
+
+#ifndef SNES_H
+#define SNES_H
+uint8_t crc_valid;
+
+void snes_init(void);
+void snes_reset(int state);
+uint8_t get_snes_reset(void);
+void snes_main_loop(void);
+uint8_t menu_main_loop(void);
+void get_selected_name(uint8_t* lfn);
+#endif

mk1-src/spi.c

@@ -0,0 +1,136 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   spi.c: Low level SPI access
+
+   Extended, optimized and cleaned version of code from MMC2IEC,
+   original copyright header follows:
+
+//
+// Title        : SPI module
+// Author       : Lars Pontoppidan
+// Date         : January, 2007
+// Version      : 1.03
+// Target MCU   : Atmel AVR Series
+//
+// DESCRIPTION:
+// This module implements initialization, sending and receiving bytes using
+// hardware SPI on an AVR.
+//
+// DISCLAIMER:
+// The author is in no way responsible for any problems or damage caused by
+// using this code. Use at your own risk.
+//
+// LICENSE:
+// This code is distributed under the GNU Public License
+// which can be found at http://www.gnu.org/licenses/gpl.txt
+//
+
+*/
+
+// FIXME: Integrate into sdcard.c
+
+#include <avr/io.h>
+#include "avrcompat.h"
+#include "spi.h"
+
+// access routines
+void spiInit(void)
+{
+  volatile uint8_t dummy;
+
+  // setup SPI I/O pins
+  SPI_PORT = (SPI_PORT & ~SPI_MASK) | SPI_SCK | SPI_SS | SPI_MISO;
+  SPI_DDR  = (SPI_DDR  & ~SPI_MASK) | SPI_SCK | SPI_SS | SPI_MOSI;
+
+  // setup SPI interface:
+  //   interrupts disabled, SPI enabled, MSB first, master mode,
+  //   leading edge rising, sample on leading edge, clock = f/4
+  SPCR = 0b01010000;
+
+  // Enable SPI double speed mode -> clock = f/2
+  SPSR = _BV(SPI2X);
+
+  // clear status
+  dummy = SPSR;
+
+  // clear receive buffer
+  dummy = SPDR;
+}
+
+
+inline uint8_t spiTransferByte(uint8_t data)
+{
+  // send the given data
+  SPDR = data;
+
+  // wait for transfer to complete
+  loop_until_bit_is_set(SPSR, SPIF);
+  // *** reading of the SPSR and SPDR are crucial
+  // *** to the clearing of the SPIF flag
+  // *** in non-interrupt mode
+
+  // return the received data
+  return SPDR;
+}
+
+
+inline uint32_t spiTransferLong(const uint32_t data)
+{
+  // It seems to be necessary to use the union in order to get efficient
+  // assembler code.
+  // Beware, endian unsafe union
+  union {
+    uint32_t l;
+    uint8_t  c[4];
+  } long2char;
+
+  long2char.l = data;
+
+  // send the given data
+  SPDR = long2char.c[3];
+  // wait for transfer to complete
+  loop_until_bit_is_set(SPSR, SPIF);
+  long2char.c[3] = SPDR;
+
+  SPDR = long2char.c[2];
+  // wait for transfer to complete
+  loop_until_bit_is_set(SPSR, SPIF);
+  long2char.c[2] = SPDR;
+
+  SPDR = long2char.c[1];
+  // wait for transfer to complete
+  loop_until_bit_is_set(SPSR, SPIF);
+  long2char.c[1] = SPDR;
+
+  SPDR = long2char.c[0];
+  // wait for transfer to complete
+  loop_until_bit_is_set(SPSR, SPIF);
+  long2char.c[0] = SPDR;
+
+  return long2char.l;
+}

mk1-src/spi.h

@@ -0,0 +1,73 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   spi.h: Definitions for the low-level SPI routines
+
+   Based on original code by Lars Pontoppidan et al., see spi.c
+   for full copyright details.
+
+*/
+
+#ifndef SPI_H
+#define SPI_H
+
+// function prototypes
+
+// SPI interface initializer
+void spiInit(void);
+
+// spiTransferByte(u08 data) waits until the SPI interface is ready
+// and then sends a single byte over the SPI port.  The function also
+// returns the byte that was received during transmission.
+uint8_t spiTransferByte(uint8_t data);
+
+// spiTransferLong(u08 data) waits until the SPI interface is ready
+// and then sends the long with MSB first over the SPI port.
+uint32_t spiTransferLong(uint32_t data);
+
+// Macros for setting slave select:
+#ifdef CONFIG_TWINSD
+# define SPI_SS_HIGH(card) do { \
+    if (card == 0) {            \
+      SPI_PORT |= SPI_SS;       \
+    } else {                    \
+      SD2_PORT |= SD2_CS;       \
+    }                           \
+  } while (0)
+#define SPI_SS_LOW(card) do {       \
+    if (card == 0) {                \
+      SPI_PORT &= (uint8_t)~SPI_SS; \
+    } else {                        \
+      SD2_PORT &= (uint8_t)~SD2_CS; \
+    }                               \
+  } while (0)
+#else
+# define SPI_SS_HIGH(card)  SPI_PORT |= SPI_SS
+# define SPI_SS_LOW(card)   SPI_PORT &= (uint8_t)~SPI_SS
+#endif
+
+#endif

mk1-src/src2doxy.pl

@@ -0,0 +1,75 @@
+#!/usr/bin/perl -w -i~
+
+# src2doxy.pl - create doxygen-compatible comments from readable C source
+# Copyright (C) 2008  Ingo Korb <ingo@akana.de>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License only.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# This script parses a subset of kernel-doc style comments and rewrites
+# them as something doxygen will understand.
+use strict;
+
+my $incomment = 0;
+my $inspecialcomment = 0;
+my @postcomment = ();
+my @outputstack;
+
+while (<>) {
+    my $filename;
+    ($filename = $ARGV) =~ s!.*/!!;
+
+    chomp;
+    s/\r$//;
+    s/\s+$//;
+
+    # doxygen is too stupid to understand after-the-variable comments
+    # without external help. WARNING: Will substitute within strings!
+    s!([^ \t]\s+)/// !$1///< !;
+    
+    $incomment = 1 if m!^/\*!;
+    if (m!^/\*\*$!) {
+        $inspecialcomment = 1;
+        # Kill output
+        $_ = "";
+        next;
+    }
+
+    if ($incomment) {
+        if (m!\*/$!) {
+            # End of comment
+            $incomment = 0;
+            $inspecialcomment = 0;
+            @outputstack = @postcomment;
+            @postcomment = ();
+        } elsif (/$filename:\s+(.*).?\s*$/) {
+            # Add file description
+            push @postcomment, "\n/*! \\file $ARGV\n * \\brief $1. */\n";
+        }
+        if ($inspecialcomment == 1) {
+            # First line of special comment: Brief description
+            $inspecialcomment = 2;
+            m/^\s*\*\s*((struct |union )?[^: \t]+):?\s+-?\s*(.*)\s*$/;
+            $_ = "/*! \\brief $3\n *";
+        } elsif ($inspecialcomment == 2) {
+            # Modify parameters
+            s/\@([^: \t]+)\s*:\s+(.*)\s*$/\\param $1 $2/;
+        }
+    }
+} continue {
+    print "$_\n";
+    while (scalar(@outputstack)) {
+        print shift @outputstack,"\n";
+    }
+}
+

mk1-src/time.h

@@ -0,0 +1,16 @@
+#ifndef TIME_H
+#define TIME_H
+
+typedef uint32_t time_t;
+struct tm {
+  uint8_t tm_sec;  // 0..59
+  uint8_t tm_min;  // 0..59
+  uint8_t tm_hour; // 0..23
+  uint8_t tm_mday; // 1..[28..31]
+  uint8_t tm_mon;  // 0..11
+  uint8_t tm_year; // since 1900, i.e. 2000 is 100
+  uint8_t tm_wday; // 0 to 6, sunday is 6
+  // A Unix struct tm has a few more fields we don't need in this application
+};
+
+#endif	/* TIME_H */

mk1-src/timer.c

@@ -0,0 +1,135 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   timer.c: System timer (and button debouncer)
+
+*/
+
+#include "config.h"
+#include <avr/interrupt.h>
+#include <avr/io.h>
+#include "avrcompat.h"
+#include "led.h"
+#include "timer.h"
+
+volatile tick_t ticks;
+// Logical buttons
+volatile uint8_t active_keys;
+
+// Physical buttons
+uint8_t buttonstate;
+tick_t  lastbuttonchange;
+
+/* Called by the timer interrupt when the button state has changed */
+static void buttons_changed(void) {
+  /* Check if the previous state was stable for two ticks */
+  if (time_after(ticks, lastbuttonchange+2)) {
+    if (active_keys & IGNORE_KEYS) {
+      active_keys &= ~IGNORE_KEYS;
+    } else if (!(buttonstate & (BUTTON_PREV|BUTTON_NEXT))) {
+      /* Both buttons held down */
+        active_keys |= KEY_HOME;
+    } else if (!(buttonstate & BUTTON_NEXT) &&
+               (BUTTON_PIN & BUTTON_NEXT)) {
+      /* "Next" button released */
+      active_keys |= KEY_NEXT;
+    } else if (!(buttonstate & BUTTON_PREV) &&
+               (BUTTON_PIN & BUTTON_NEXT)) {
+      active_keys |= KEY_PREV;
+    }
+  }
+
+  lastbuttonchange = ticks;
+  buttonstate = BUTTON_PIN & BUTTON_MASK;
+}
+
+/* The main timer interrupt */
+ISR(TIMER1_COMPA_vect) {
+  uint8_t tmp = BUTTON_PIN & BUTTON_MASK;
+
+  if (tmp != buttonstate) {
+    buttons_changed();
+  }
+
+  ticks++;
+
+#ifdef SINGLE_LED
+  if (led_state & LED_ERROR) {
+    if ((ticks & 15) == 0)
+      DIRTY_LED_PORT ^= DIRTY_LED_BIT();
+  } else {
+    if ((led_state & LED_BUSY) || (led_state & LED_DIRTY)) {
+      DIRTY_LED_ON();
+    } else {
+      DIRTY_LED_OFF();
+    }
+  }
+#else
+  if (led_state & LED_ERROR)
+    if ((ticks & 15) == 0)
+      DIRTY_LED_PORT ^= DIRTY_LED_BIT();
+#endif
+
+  /* Sleep button triggers when held down for 2sec */
+  if (time_after(ticks, lastbuttonchange+2)) {
+    if (!(buttonstate & BUTTON_NEXT) &&
+        (buttonstate & BUTTON_PREV) &&
+        time_after(ticks, lastbuttonchange+2*HZ) &&
+        !key_pressed(KEY_SLEEP)) {
+      /* Set ignore flag so the release doesn't trigger KEY_NEXT */
+      active_keys |= KEY_SLEEP | IGNORE_KEYS;
+      /* Avoid triggering for the next two seconds */
+      lastbuttonchange = ticks;
+    }
+  }
+#if CONFIG_RTC_VARIANT == 1
+  increment_rtc();
+#endif
+
+#ifdef CONFIG_REMOTE_DISPLAY
+  /* Check if the display wants to be queried */
+  if (!(SOFTI2C_PIN & _BV(SOFTI2C_BIT_INTRQ))) {
+    active_keys |= KEY_DISPLAY;
+  }
+#endif
+}
+
+void timer_init(void) {
+  /* Count F_CPU/8 in timer 0 */
+  TCCR0B = _BV(CS01);
+
+  /* Set up a 100Hz interrupt using timer 1 */
+  OCR1A  = 1249;
+  TCNT1  = 0;
+  TCCR1A = 0;
+  TCCR1B = _BV(WGM12) | _BV(CS10) | _BV(CS11);
+  TIMSK1 |= _BV(OCIE1A);
+
+  /* Buttons */
+  BUTTON_DDR  &= (uint8_t)~BUTTON_MASK;
+  BUTTON_PORT |= BUTTON_MASK;
+}

mk1-src/timer.h

@@ -0,0 +1,121 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   timer.h: System timer (and button-debouncer)
+
+*/
+
+#ifndef TIMER_H
+#define TIMER_H
+
+#include <util/atomic.h>
+
+// Bit masks for the (simulated) keys
+#define KEY_NEXT    (1<<0)
+#define KEY_PREV    (1<<1)
+#define KEY_HOME    (1<<2)
+#define KEY_SLEEP   (1<<3)
+/* Remote display service request */
+#define KEY_DISPLAY (1<<4)
+
+#define IGNORE_KEYS (1<<7)
+
+/// Logical keys that were pressed - must be reset by the reader.
+extern volatile uint8_t active_keys;
+
+#define key_pressed(x) (active_keys & (x))
+#define reset_key(x) active_keys &= (uint8_t)~(x)
+#define ignore_keys() active_keys = IGNORE_KEYS;
+
+typedef uint16_t tick_t;
+
+/// Global timing variable, 100 ticks per second
+/// Use atomic access or getticks() !
+extern volatile tick_t ticks;
+#define HZ 100
+
+/**
+ * getticks - return the current system tick count
+ *
+ * This inline function returns the current system tick count.
+ */
+static inline tick_t getticks(void) {
+  tick_t tmp;
+  ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
+    tmp = ticks;
+  }
+  return tmp;
+}
+
+#define MS_TO_TICKS(x) (x/10)
+
+/* Adapted from Linux 2.6 include/linux/jiffies.h:
+ *
+ *      These inlines deal with timer wrapping correctly. You are
+ *      strongly encouraged to use them
+ *      1. Because people otherwise forget
+ *      2. Because if the timer wrap changes in future you won't have to
+ *         alter your driver code.
+ *
+ * time_after(a,b) returns true if the time a is after time b.
+ *
+ * Do this with "<0" and ">=0" to only test the sign of the result. A
+ * good compiler would generate better code (and a really good compiler
+ * wouldn't care). Gcc is currently neither.
+ * (">=0" refers to the time_after_eq macro which wasn't copied)
+ */
+#define time_after(a,b)         \
+         ((int16_t)(b) - (int16_t)(a) < 0)
+#define time_before(a,b)        time_after(b,a)
+
+
+/// Calculate timer start value for given timeout in microseconds
+#define TIMEOUT_US(x) (256-((float)F_CPU/10000000.0)*x)
+
+/**
+ * start_timeout - start a timeout using timer0
+ * @startval: starting value for timer
+ *
+ * This function sets timer 0 to the specified value and clears its overflow
+ * flag. Use in conjunction with TIMEOUT_US to cause a timer overflow after
+ * a specified number of microseconds. DON'T use a variable as a parameter to
+ * the TIMEOUT_US macro because that would require run-time float calculations.
+ */
+#define start_timeout(startval) do { TCNT0 = startval; TIFR0 |= _BV(TOV0); } while (0)
+
+/**
+ * has_timed_out - returns true if timeout was reached
+ *
+ * This function returns true if the overflow flag of timer 0 is set which
+ * (together with start_timeout and TIMEOUT_US) will happen when the
+ * specified time has elapsed.
+ */
+#define has_timed_out() (TIFR0 & _BV(TOV0))
+
+void timer_init(void);
+
+#endif

mk1-src/uart.c

@@ -0,0 +1,187 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   uart.c: UART access routines
+
+*/
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+#include <stdio.h>
+#include "config.h"
+#include "avrcompat.h"
+#include "uart.h"
+
+static uint8_t txbuf[1 << CONFIG_UART_BUF_SHIFT];
+static volatile uint16_t read_idx;
+static volatile uint16_t write_idx;
+
+ISR(USART_UDRE_vect) {
+  if (read_idx == write_idx) return;
+  UDR = txbuf[read_idx];
+  read_idx = (read_idx+1) & (sizeof(txbuf)-1);
+  if (read_idx == write_idx)
+    UCSRB &= ~ _BV(UDRIE);
+}
+
+void uart_putc(char c) {
+  uint16_t t=(write_idx+1) & (sizeof(txbuf)-1);
+#ifndef CONFIG_DEADLOCK_ME_HARDER // :-)
+  UCSRB &= ~ _BV(UDRIE);   // turn off RS232 irq
+#else
+  while (t == read_idx);   // wait for free space
+#endif
+  txbuf[write_idx] = c;
+  write_idx = t;
+  //if (read_idx == write_idx) PORTD |= _BV(PD7);
+  UCSRB |= _BV(UDRIE);
+}
+
+void uart_puthex(uint8_t num) {
+  uint8_t tmp;
+  tmp = (num & 0xf0) >> 4;
+  if (tmp < 10)
+    uart_putc('0'+tmp);
+  else
+    uart_putc('a'+tmp-10);
+
+  tmp = num & 0x0f;
+  if (tmp < 10)
+    uart_putc('0'+tmp);
+  else
+    uart_putc('a'+tmp-10);
+}
+
+void uart_puthexlong(uint32_t num) {
+	uart_puthex((num>>24)&0xff);
+	uart_puthex((num>>16)&0xff);
+	uart_puthex((num>>8)&0xff);
+	uart_puthex(num&0xff);
+}
+
+void uart_puthexshort(uint16_t num) {
+	uart_puthex((num>>8)&0xff);
+	uart_puthex(num&0xff);
+}
+
+
+void uart_trace(void *ptr, uint16_t start, uint16_t len) {
+  uint16_t i;
+  uint8_t j;
+  uint8_t ch;
+  uint8_t *data = ptr;
+
+  data+=start;
+  for(i=0;i<len;i+=16) {
+
+    uart_puthex(start>>8);
+    uart_puthex(start&0xff);
+    uart_putc('|');
+    uart_putc(' ');
+    for(j=0;j<16;j++) {
+      if(i+j<len) {
+        ch=*(data + j);
+        uart_puthex(ch);
+      } else {
+        uart_putc(' ');
+        uart_putc(' ');
+      }
+      uart_putc(' ');
+    }
+    uart_putc('|');
+    for(j=0;j<16;j++) {
+      if(i+j<len) {
+        ch=*(data++);
+        if(ch<32 || ch>0x7e)
+          ch='.';
+        uart_putc(ch);
+      } else {
+        uart_putc(' ');
+      }
+    }
+    uart_putc('|');
+    uart_putcrlf();
+    start+=16;
+  }
+}
+
+static int ioputc(char c, FILE *stream) {
+  if (c == '\n') uart_putc('\r');
+  uart_putc(c);
+  return 0;
+}
+
+uint8_t uart_getc(void) {
+  loop_until_bit_is_set(UCSRA,RXC);
+  return UDR;
+}
+
+void uart_flush(void) {
+  while (read_idx != write_idx) ;
+}
+
+void uart_puts_P(prog_char *text) {
+  uint8_t ch;
+
+  while ((ch = pgm_read_byte(text++))) {
+    uart_putc(ch);
+  }
+}
+
+void uart_putcrlf(void) {
+  uart_putc(13);
+  uart_putc(10);
+}
+
+static FILE mystdout = FDEV_SETUP_STREAM(ioputc, NULL, _FDEV_SETUP_WRITE);
+
+void uart_init(void) {
+  /* Seriellen Port konfigurieren */
+
+/*  UBRRH = (int)((double)F_CPU/(16.0*CONFIG_UART_BAUDRATE)-1) >> 8;
+  UBRRL = (int)((double)F_CPU/(16.0*CONFIG_UART_BAUDRATE)-1) & 0xff;*/
+
+  UBRRH = (int)((double)F_CPU/(8.0*CONFIG_UART_BAUDRATE)-1) >> 8;
+  UBRRL = (int)((double)F_CPU/(8.0*CONFIG_UART_BAUDRATE)-1) & 0xff;
+
+  UCSRA |= _BV(U2X0);
+
+  UCSRB = _BV(RXEN) | _BV(TXEN);
+  // I really don't like random #ifdefs in the code =(
+#if defined __AVR_ATmega32__
+  UCSRC = _BV(URSEL) | _BV(UCSZ1) | _BV(UCSZ0);
+#else
+  UCSRC = _BV(UCSZ1) | _BV(UCSZ0);
+#endif
+
+  stdout = &mystdout;
+
+  //UCSRB |= _BV(UDRIE);
+  read_idx  = 0;
+  write_idx = 0;
+}

mk1-src/uart.h

@@ -0,0 +1,66 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   uart.h: Definitions for the UART access routines
+
+*/
+
+#ifndef UART_H
+#define UART_H
+
+#ifdef CONFIG_UART_DEBUG
+
+#include <avr/pgmspace.h>
+
+void uart_init(void);
+unsigned char uart_getc(void);
+void uart_putc(char c);
+void uart_puthex(uint8_t num);
+void uart_puthexlong(uint32_t num);
+void uart_puthexshort(uint16_t num);
+void uart_trace(void *ptr, uint16_t start, uint16_t len);
+void uart_flush(void);
+void uart_puts_P(prog_char *text);
+void uart_putcrlf(void);
+
+#include <stdio.h>
+#define dprintf(str,...) printf_P(PSTR(str), ##__VA_ARGS__)
+
+#else
+
+#define uart_init()    do {} while(0)
+#define uart_getc()    0
+#define uart_putc(x)   do {} while(0)
+#define uart_puthex(x) do {} while(0)
+#define uart_flush()   do {} while(0)
+#define uart_puts_P(x) do {} while(0)
+#define uart_putcrlf() do {} while(0)
+#define uart_trace(a,b,c) do {} while(0)
+
+#endif
+
+#endif

mk1-src/ustring.h

@@ -0,0 +1,47 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   ustring.h: uint8_t wrappers for string.h-functions
+
+*/
+
+#ifndef USTRING_H
+#define USTRING_H
+
+#include <string.h>
+
+#define ustrcasecmp_P(s1,s2) (strcasecmp_P((char *)(s1), (s2)))
+#define ustrchr(s,c)         ((uint8_t *)strchr((char *)(s), (c)))
+#define ustrcmp(s1,s2)       (strcmp((char *)(s1), (char *)(s2)))
+#define ustrcmp_P(s1,s2)     (strcmp_P((char *)(s1), (s2)))
+#define ustrcpy(s1,s2)       (strcpy((char *)(s1), (char *)(s2)))
+#define ustrcpy_P(s1,s2)     (strcpy_P((char *)(s1), (s2)))
+#define ustrncpy(s1,s2,n)    (strncpy((char *)(s1), (char *)(s2),(n)))
+#define ustrlen(s)           (strlen((char *)(s)))
+#define ustrrchr(s,c)        ((uint8_t *)strrchr((char *)(s), (c)))
+
+#endif

mk1-src/utils.c

@@ -0,0 +1,82 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   utils.c: Misc. utility functions that didn't fit elsewhere
+
+*/
+
+#include <stdint.h>
+#include "ustring.h"
+
+uint8_t *appendnumber(uint8_t *msg, uint8_t value) {
+  if (value >= 100) {
+    *msg++ = '0' + value/100;
+    value %= 100;
+  }
+
+  *msg++ = '0' + value/10;
+  *msg++ = '0' + value%10;
+
+  return msg;
+}
+
+/* Convert a one-byte BCD value to a normal integer */
+uint8_t bcd2int(uint8_t value) {
+  return (value & 0x0f) + 10*(value >> 4);
+}
+
+/* Convert a uint8_t into a BCD value */
+uint8_t int2bcd(uint8_t value) {
+  return (value % 10) + 16*(value/10);
+}
+
+/* Similiar to strtok_r, but only a single delimiting character  */
+uint8_t *ustr1tok(uint8_t *str, const uint8_t delim, uint8_t **saveptr) {
+  uint8_t *tmp;
+
+  if (str == NULL)
+    str = *saveptr;
+
+  /* Skip leading delimiters */
+  while (*str == delim) str++;
+
+  /* If there is anything left... */
+  if (*str) {
+    /* Search for the next delimiter */
+    tmp = str;
+    while (*tmp && *tmp != delim) tmp++;
+
+    /* Terminate the string there */
+    if (*tmp != 0)
+      *tmp++ = 0;
+
+    *saveptr = tmp;
+
+    return str;
+  } else
+    return NULL;
+}

mk1-src/utils.h

@@ -0,0 +1,57 @@
+/* sd2snes - SD card based universal cartridge for the SNES
+   Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
+   This file was adapted from sd2iec, written by Ingo Korb.
+   Original copyright header follows:
+*/
+/* sd2iec - SD/MMC to Commodore serial bus interface/controller
+   Copyright (C) 2007-2009  Ingo Korb <ingo@akana.de>
+
+   Inspiration and low-level SD/MMC access based on code from MMC2IEC
+     by Lars Pontoppidan et al., see sdcard.c|h and config.h.
+
+   FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License only.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+   utils.c: Misc. utility functions that didn't fit elsewhere
+
+*/
+
+#ifndef UTILS_H
+#define UTILS_H
+
+/* Side-effect safe min/max */
+#define max(a,b) \
+       ({ typeof (a) _a = (a); \
+           typeof (b) _b = (b); \
+         _a > _b ? _a : _b; })
+
+#define min(a,b) \
+       ({ typeof (a) _a = (a); \
+           typeof (b) _b = (b); \
+         _a < _b ? _a : _b; })
+
+
+/* Write a number to a string as ASCII */
+uint8_t *appendnumber(uint8_t *msg, uint8_t value);
+
+/* Convert between integer and BCD */
+uint8_t bcd2int(uint8_t value);
+uint8_t int2bcd(uint8_t value);
+
+/* Tokenize a string like strtok_r, but with a single delimiter character only */
+uint8_t *ustr1tok(uint8_t *str, const uint8_t delim, uint8_t **saveptr);
+
+#endif