o atmega 644 test

2009-06-22 15:00:52 +02:00 · 2009-06-22 15:00:52 +02:00 · b2c644b6e7
commit b2c644b6e7
parent 9991dfa249
4 changed files with 917 additions and 0 deletions
--- a/poc/poc_at644/Makefile
+++ b/poc/poc_at644/Makefile
@ -0,0 +1,453 @@
+# Hey Emacs, this is a -*- makefile -*-
+#
+# WinAVR makefile written by Eric B. Weddington, Jörg Wunsch, et al.
+# Released to the Public Domain
+# Please read the make user manual!
+#
+# Additional material for this makefile was submitted by:
+#  Tim Henigan
+#  Peter Fleury
+#  Reiner Patommel
+#  Sander Pool
+#  Frederik Rouleau
+#  Markus Pfaff
+#
+# On command line:
+#
+# make all = Make software.
+#
+# make clean = Clean out built project files.
+#
+# make coff = Convert ELF to AVR COFF (for use with AVR Studio 3.x or VMLAB).
+#
+# make extcoff = Convert ELF to AVR Extended COFF (for use with AVR Studio
+#                4.07 or greater).
+#
+# make program = Download the hex file to the device, using avrdude.  Please
+#                customize the avrdude settings below first!
+#
+# make filename.s = Just compile filename.c into the assembler code only
+#
+# To rebuild project do "make clean" then "make all".
+#
+
+# mth 2004/09 
+# Differences from WinAVR 20040720 sample:
+# - DEPFLAGS according to Eric Weddingtion's fix (avrfreaks/gcc-forum)
+# - F_OSC Define in CFLAGS and AFLAGS
+
+
+# MCU name
+MCU = atmega644
+
+# Main Oscillator Frequency
+# This is only used to define F_OSC in all assembler and c-sources.
+F_OSC = 8000000
+
+# Output format. (can be srec, ihex, binary)
+FORMAT = ihex
+
+# Target file name (without extension).
+TARGET = main
+
+
+# List C source files here. (C dependencies are automatically generated.)
+SRC = $(TARGET).c
+
+
+# List Assembler source files here.
+# Make them always end in a capital .S.  Files ending in a lowercase .s
+# will not be considered source files but generated files (assembler
+# output from the compiler), and will be deleted upon "make clean"!
+# Even though the DOS/Win* filesystem matches both .s and .S the same,
+# it will preserve the spelling of the filenames, and gcc itself does
+# care about how the name is spelled on its command-line.
+ASRC = 
+
+
+
+# Optimization level, can be [0, 1, 2, 3, s]. 
+# 0 = turn off optimization. s = optimize for size.
+# (Note: 3 is not always the best optimization level. See avr-libc FAQ.)
+OPT = s
+
+# Debugging format.
+# Native formats for AVR-GCC's -g are stabs [default], or dwarf-2.
+# AVR (extended) COFF requires stabs, plus an avr-objcopy run.
+#DEBUG = stabs
+#DEBUG = dwarf-2
+
+# List any extra directories to look for include files here.
+#     Each directory must be seperated by a space.
+EXTRAINCDIRS = 
+
+
+# Compiler flag to set the C Standard level.
+# c89   - "ANSI" C
+# gnu89 - c89 plus GCC extensions
+# c99   - ISO C99 standard (not yet fully implemented)
+# gnu99 - c99 plus GCC extensions
+CSTANDARD = -std=gnu99
+
+# Place -D or -U options here
+CDEFS =
+
+# Place -I options here
+CINCS =
+
+
+# Compiler flags.
+#  -g*:          generate debugging information
+#  -O*:          optimization level
+#  -f...:        tuning, see GCC manual and avr-libc documentation
+#  -Wall...:     warning level
+#  -Wa,...:      tell GCC to pass this to the assembler.
+#    -adhlns...: create assembler listing
+CFLAGS = -g$(DEBUG)
+CFLAGS += $(CDEFS) $(CINCS)
+CFLAGS += -O$(OPT)
+CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
+CFLAGS += -Wall -Wstrict-prototypes
+CFLAGS += -Wa,-adhlns=$(<:.c=.lst)
+CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
+CFLAGS += $(CSTANDARD)
+CFLAGS += -DF_OSC=$(F_OSC)
+CFLAGS +=  -DF_CPU=8000000UL   
+#CFLAGS += -DF_CPU=3686400UL
+
+
+# Assembler flags.
+#  -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=$(<:.S=.lst),-gstabs 
+ASFLAGS += -DF_OSC=$(F_OSC)
+
+
+#Additional libraries.
+
+# 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
+
+PRINTF_LIB = 
+
+# 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
+
+SCANF_LIB = 
+
+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 flags.
+#  -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) $(MATH_LIB)
+
+
+
+
+# Programming support using avrdude. Settings and variables.
+
+# Programming hardware: alf avr910 avrisp bascom bsd 
+# dt006 pavr picoweb pony-stk200 sp12 stk200 stk500
+#
+# Type: avrdude -c ?
+# to get a full listing.
+#
+AVRDUDE_PROGRAMMER = stk500v2
+
+# com1 = serial port. Use lpt1 to connect to parallel port.
+AVRDUDE_PORT = /dev/ttyUSB0    # programmer connected to serial device
+
+AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex
+#AVRDUDE_WRITE_EEPROM = -U eeprom:w:$(TARGET).eep
+
+
+# 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 += $(AVRDUDE_ERASE_COUNTER)
+
+#
+# Mega8 set to  internal 4mhz
+# avrdude -p atmega8 -P /dev/ttyUSB0  -c stk500v2 -U lfuse:w:0xe3:m 
+#
+
+
+#flashmac:
+#	uisp  -dprog=avr910 -dpart=ATmega8 -dserial=/dev/cu.PL2303-00002326  --erase -v --upload if=$(TARGET).hex 
+
+
+
+
+
+# ---------------------------------------------------------------------------
+
+# Define directories, if needed.
+DIRAVR = c:/winavr
+DIRAVRBIN = $(DIRAVR)/bin
+DIRAVRUTILS = $(DIRAVR)/utils/bin
+DIRINC = .
+DIRLIB = $(DIRAVR)/avr/lib
+
+
+# Define programs and commands.
+SHELL = sh
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+SIZE = avr-size
+NM = avr-nm
+AVRDUDE = avrdude
+REMOVE = rm -f
+COPY = cp
+
+
+
+
+# Define Messages
+# English
+MSG_ERRORS_NONE = Errors: none
+MSG_BEGIN = -------- begin --------
+MSG_END = --------  end  --------
+MSG_SIZE_BEFORE = Size before: 
+MSG_SIZE_AFTER = Size after:
+MSG_COFF = Converting to AVR COFF:
+MSG_EXTENDED_COFF = Converting to AVR Extended COFF:
+MSG_FLASH = Creating load file for Flash:
+MSG_EEPROM = Creating load file for EEPROM:
+MSG_EXTENDED_LISTING = Creating Extended Listing:
+MSG_SYMBOL_TABLE = Creating Symbol Table:
+MSG_LINKING = Linking:
+MSG_COMPILING = Compiling:
+MSG_ASSEMBLING = Assembling:
+MSG_CLEANING = Cleaning project:
+
+
+
+
+# Define all object files.
+OBJ = $(SRC:.c=.o) $(ASRC:.S=.o) 
+
+# Define all listing files.
+LST = $(ASRC:.S=.lst) $(SRC:.c=.lst)
+
+
+# Compiler flags to generate dependency files.
+### GENDEPFLAGS = -Wp,-M,-MP,-MT,$(*F).o,-MF,.dep/$(@F).d
+GENDEPFLAGS = -MD -MP -MF .dep/$(@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)
+
+
+
+
+
+# Default target.
+all: begin gccversion sizebefore build sizeafter finished end
+
+build: elf hex eep lss sym
+
+elf: $(TARGET).elf
+hex: $(TARGET).hex
+eep: $(TARGET).eep
+lss: $(TARGET).lss 
+sym: $(TARGET).sym
+
+
+
+# Eye candy.
+# AVR Studio 3.x does not check make's exit code but relies on
+# the following magic strings to be generated by the compile job.
+begin:
+	@echo
+	@echo $(MSG_BEGIN)
+
+finished:
+	@echo $(MSG_ERRORS_NONE)
+
+end:
+	@echo $(MSG_END)
+	@echo
+
+
+# Display size of file.
+HEXSIZE = $(SIZE) --target=$(FORMAT) $(TARGET).hex
+ELFSIZE = $(SIZE) -A $(TARGET).elf
+sizebefore:
+	@if [ -f $(TARGET).elf ]; then echo; echo $(MSG_SIZE_BEFORE); $(ELFSIZE); echo; fi
+
+sizeafter:
+	@if [ -f $(TARGET).elf ]; then echo; echo $(MSG_SIZE_AFTER); $(ELFSIZE); echo; fi
+
+
+
+# Display compiler version information.
+gccversion : 
+	@$(CC) --version
+
+
+
+# Program the device.  
+
+flash_avrdude: flash
+
+flash: $(TARGET).hex $(TARGET).eep
+	sudo $(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM)
+
+flash_uisp:
+	sudo uisp -dprog=avr910 -dpart=ATmega8 -dserial=/dev/ttyUSB0  --verify --erase -v --upload if=$(TARGET).hex
+
+
+
+# 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
+	@echo
+	@echo $(MSG_COFF) $(TARGET).cof
+	$(COFFCONVERT) -O coff-avr $< $(TARGET).cof
+
+
+extcoff: $(TARGET).elf
+	@echo
+	@echo $(MSG_EXTENDED_COFF) $(TARGET).cof
+	$(COFFCONVERT) -O coff-ext-avr $< $(TARGET).cof
+
+
+
+# Create final output files (.hex, .eep) from ELF output file.
+%.hex: %.elf
+	@echo
+	@echo $(MSG_FLASH) $@
+	$(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@
+
+%.eep: %.elf
+	@echo
+	@echo $(MSG_EEPROM) $@
+	-$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
+	--change-section-lma .eeprom=0 -O $(FORMAT) $< $@
+
+# Create extended listing file from ELF output file.
+%.lss: %.elf
+	@echo
+	@echo $(MSG_EXTENDED_LISTING) $@
+	$(OBJDUMP) -h -S $< > $@
+
+# Create a symbol table from ELF output file.
+%.sym: %.elf
+	@echo
+	@echo $(MSG_SYMBOL_TABLE) $@
+	$(NM) -n $< > $@
+
+
+
+# Link: create ELF output file from object files.
+.SECONDARY : $(TARGET).elf
+.PRECIOUS : $(OBJ)
+%.elf: $(OBJ)
+	@echo
+	@echo $(MSG_LINKING) $@
+	$(CC) $(ALL_CFLAGS) $(OBJ) --output $@ $(LDFLAGS)
+
+
+# Compile: create object files from C source files.
+%.o : %.c
+	@echo
+	@echo $(MSG_COMPILING) $<
+	$(CC) -c $(ALL_CFLAGS) $< -o $@ 
+
+
+# Compile: create assembler files from C source files.
+%.s : %.c
+	$(CC) -S $(ALL_CFLAGS) $< -o $@
+
+
+# Assemble: create object files from assembler source files.
+%.o : %.S
+	@echo
+	@echo $(MSG_ASSEMBLING) $<
+	$(CC) -c $(ALL_ASFLAGS) $< -o $@
+
+
+
+# Target: clean project.
+clean: begin clean_list finished end
+
+clean_list :
+	@echo
+	@echo $(MSG_CLEANING)
+	$(REMOVE) $(TARGET).hex
+	$(REMOVE) $(TARGET).eep
+	$(REMOVE) $(TARGET).obj
+	$(REMOVE) $(TARGET).cof
+	$(REMOVE) $(TARGET).elf
+	$(REMOVE) $(TARGET).map
+	$(REMOVE) $(TARGET).obj
+	$(REMOVE) $(TARGET).a90
+	$(REMOVE) $(TARGET).sym
+	$(REMOVE) $(TARGET).lnk
+	$(REMOVE) $(TARGET).lss
+	$(REMOVE) $(OBJ)
+	$(REMOVE) $(LST)
+	$(REMOVE) $(SRC:.c=.s)
+	$(REMOVE) $(SRC:.c=.d)
+	$(REMOVE) .dep/*
+
+
+
+# Include the dependency files.
+-include $(shell mkdir .dep 2>/dev/null) $(wildcard .dep/*)
+
+
+# Listing of phony targets.
+.PHONY : all begin finish end sizebefore sizeafter gccversion \
+build elf hex eep lss sym coff extcoff \
+clean clean_list program
+
--- a/poc/poc_at644/main.c
+++ b/poc/poc_at644/main.c
@ -0,0 +1,109 @@
+
+#include <avr/io.h>
+#include <util/delay.h>
+#include <stdlib.h>
+
+
+//SREG defines
+#define S_MOSI 	PB3
+#define S_MISO	PB4
+#define S_SCK  	PB5
+#define S_LATCH	PB2
+
+//DEBUG defines
+#define D_LED0	PC5
+
+//SRAM defines
+#define R_WR	PB6
+#define R_RD	PB7
+#define R_DATA	PORTD
+#define R_DIR	DDRD
+
+
+
+void SPI_MasterInit(void)
+{
+	/* Set MOSI and SCK output, all others input */
+	DDRB |= ((1<<S_MOSI) | (1<<S_SCK) | (1<<S_LATCH));
+	DDRB &= ~(1<<S_MISO);
+	PORTB |= (1<<S_MISO);
+
+	/* Enable SPI, Master*/
+	SPCR = ((1<<SPE) | (1<<MSTR));
+}
+
+void SPI_MasterTransmit(unsigned char cData)
+{
+	/* Start transmission */
+	SPDR = cData;
+	
+	/* Wait for transmission complete */
+	while(!(SPSR & (1<<SPIF)));
+}
+
+uint8_t SRAM_Read(uint32_t addr)
+{
+	uint8_t byte;
+
+	DDRD=0x00;
+	PORTD=0xff;
+	
+	PORTB |= (1<<R_RD);
+	PORTB |= (1<<R_WR);
+
+	SPI_MasterTransmit((uint8_t)(addr>>16));	
+	SPI_MasterTransmit((uint8_t)(addr>>8));
+	SPI_MasterTransmit((uint8_t)(addr>>0));
+
+	PORTB |= (1<<S_LATCH);  
+    	PORTB &= ~(1<<S_LATCH);
+
+	PORTB &= ~(1<<R_RD);
+
+	asm volatile ("nop");
+	asm volatile ("nop");
+	asm volatile ("nop");
+	
+	byte = PIND;
+	
+	PORTB |= (1<<R_RD);
+
+	DDRD=0x00;
+	PORTD=0x00;
+
+	return byte;
+}
+
+void SRAM_Write(uint32_t addr, uint8_t data)
+{
+	DDRD=0xff;
+
+	PORTB |= (1<<R_RD);
+	PORTB |= (1<<R_WR);
+
+	SPI_MasterTransmit((uint8_t)(addr>>16));	
+	SPI_MasterTransmit((uint8_t)(addr>>8));
+	SPI_MasterTransmit((uint8_t)(addr>>0));
+
+	PORTB |= (1<<S_LATCH);  
+	PORTB &= ~(1<<S_LATCH);
+
+	PORTB &= ~(1<<R_WR);
+	
+	PORTD=data;
+
+	PORTB |= (1<<R_WR);
+
+	DDRD=0x00;	
+	PORTD=0x00;
+}
+
+
+
+int main(void)
+{
+
+    while(1);
+	return(0);
+}
+
--- a/poc/poc_at644/mmc.c
+++ b/poc/poc_at644/mmc.c
@ -0,0 +1,298 @@
+/*#######################################################################################
+Connect AVR to MMC/SD 
+
+Copyright (C) 2004 Ulrich Radig
+
+Bei Fragen und Verbesserungen wendet euch per EMail an
+
+mail@ulrichradig.de
+
+oder im Forum meiner Web Page : www.ulrichradig.de
+
+Dieses Programm ist freie Software. Sie können es unter den Bedingungen der 
+GNU General Public License, wie von der Free Software Foundation veröffentlicht, 
+weitergeben und/oder modifizieren, entweder gemäß Version 2 der Lizenz oder 
+(nach Ihrer Option) jeder späteren Version. 
+
+Die Veröffentlichung dieses Programms erfolgt in der Hoffnung, 
+daß es Ihnen von Nutzen sein wird, aber OHNE IRGENDEINE GARANTIE, 
+sogar ohne die implizite Garantie der MARKTREIFE oder der VERWENDBARKEIT 
+FÜR EINEN BESTIMMTEN ZWECK. Details finden Sie in der GNU General Public License. 
+
+Sie sollten eine Kopie der GNU General Public License zusammen mit diesem 
+Programm erhalten haben. 
+Falls nicht, schreiben Sie an die Free Software Foundation, 
+Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. 
+#######################################################################################*/
+
+#include "mmc.h"
+#include <util/delay.h>
+
+//############################################################################
+//Routine zur Initialisierung der MMC/SD-Karte (SPI-MODE)
+unsigned char mmc_init ()
+//############################################################################
+{
+	unsigned int Timeout = 0,i;
+	
+	//Konfiguration des Ports an der die MMC/SD-Karte angeschlossen wurde
+	DDRC  |= ( (1<<MMC_DO) | (1<<MMC_CS) | (1<<MMC_CLK) );
+        DDRC  &=  ~(1<<MMC_DI);
+        PORTC |= ( (1<<MMC_DO) | (1<<MMC_DI) | (1<<MMC_CS) );
+
+	//Wartet eine kurze Zeit
+	_delay_ms(10);
+
+	
+	//Initialisiere MMC/SD-Karte in den SPI-Mode
+	for(i=0; i<250; i++)
+	{
+                PORTC ^= (1<<MMC_CLK);
+                _delay_us(4);
+        }
+        
+	PORTC &= ~(1<<MMC_CLK);
+        _delay_us(10);
+
+	 PORTC &= ~(1<<MMC_CS);
+        _delay_us(3);
+
+	
+	//Sendet Commando CMD0 an MMC/SD-Karte
+	unsigned char CMD[] = {0x40,0x00,0x00,0x00,0x00,0x95};
+	
+	while(mmc_write_command (CMD) !=1)
+	{
+		if (Timeout++ > 20)
+		{
+			MMC_Disable();
+			return(1); //Abbruch bei Commando1 (Return Code1)
+		}
+	}
+	
+	//Sendet Commando CMD1 an MMC/SD-Karte
+	Timeout = 0;
+	
+	CMD[0] = 0x41;//Commando 1
+	CMD[5] = 0xFF;
+	
+	while( mmc_write_command (CMD) !=0)
+	{
+		if (Timeout++ > 800)
+			{
+			MMC_Disable();
+			return(9); //Abbruch bei Commando2 (Return Code2)
+			}
+	}
+	return(0);
+}
+
+//############################################################################
+//Sendet ein Commando an die MMC/SD-Karte
+unsigned char mmc_write_command (unsigned char *cmd)
+//############################################################################
+{
+	unsigned char tmp = 0xff;
+	unsigned int Timeout = 0;
+
+
+	//sendet 6 Byte Commando
+	for (unsigned char a = 0;a<0x06;a++) //sendet 6 Byte Commando zur MMC/SD-Karte
+	{
+		mmc_write_byte(*cmd++);
+	}
+
+	//Wartet auf ein gültige Antwort von der MMC/SD-Karte
+	while (tmp == 0xff)	
+	{
+		tmp = mmc_read_byte();
+
+		if (Timeout++ > 50)
+			{
+			break; //Abbruch da die MMC/SD-Karte nicht Antwortet
+			}
+		}
+	return(tmp);
+}
+
+//############################################################################
+//Routine zum Empfangen eines Bytes von der MMC-Karte 
+unsigned char mmc_read_byte (void)
+//############################################################################
+{
+	uint8_t Byte=0,j;
+	
+	for(j=0; j<8; j++){
+        	Byte = (Byte<<1);
+		
+		PORTC |= (1<<MMC_CLK);
+                _delay_us(4);
+
+                if(PINC & (1<<MMC_DI)){
+                	Byte |= 1;
+                }
+                else{
+                	Byte &= ~1;
+                }
+
+                PORTC &= ~(1<<MMC_CLK);
+                _delay_us(4);
+	}
+	
+	return (Byte);
+}
+
+
+//############################################################################
+//Routine zum Senden eines Bytes zur MMC-Karte
+void mmc_write_byte (unsigned char Byte)
+//############################################################################
+{
+	uint8_t i;
+
+	for(i=0; i<8; i++){
+        	if(Byte & 0x80){
+                	PORTC |=  (1<<MMC_DO);
+                }
+                else{
+                	PORTC &= ~(1<<MMC_DO);
+                }
+
+                Byte = (Byte<<1);
+                PORTC |=  (1<<MMC_CLK);
+                _delay_us(4);
+                PORTC &= ~(1<<MMC_CLK);
+                _delay_us(4);
+	}
+	PORTC |= (1<<MMC_DO);
+}
+
+//############################################################################
+//Routine zum schreiben eines Blocks(512Byte) auf die MMC/SD-Karte
+unsigned char mmc_write_sector (unsigned long addr,unsigned char *Buffer)
+//############################################################################
+{
+	unsigned char tmp;
+	//Commando 24 zum schreiben eines Blocks auf die MMC/SD - Karte
+	unsigned char cmd[] = {0x58,0x00,0x00,0x00,0x00,0xFF}; 
+	
+	/*Die Adressierung der MMC/SD-Karte wird in Bytes angegeben,
+	  addr wird von Blocks zu Bytes umgerechnet danach werden 
+	  diese in das Commando eingefügt*/
+	  
+	addr = addr << 9; //addr = addr * 512
+	
+	cmd[1] = ((addr & 0xFF000000) >>24 );
+	cmd[2] = ((addr & 0x00FF0000) >>16 );
+	cmd[3] = ((addr & 0x0000FF00) >>8 );
+
+	//Sendet Commando cmd24 an MMC/SD-Karte (Write 1 Block/512 Bytes)
+	tmp = mmc_write_command (cmd);
+	if (tmp != 0)
+		{
+		return(tmp);
+		}
+			
+	//Wartet einen Moment und sendet einen Clock an die MMC/SD-Karte
+	for (unsigned char a=0;a<100;a++)
+		{
+		mmc_read_byte();
+		}
+	
+	//Sendet Start Byte an MMC/SD-Karte
+	mmc_write_byte(0xFE);	
+	
+	//Schreiben des Bolcks (512Bytes) auf MMC/SD-Karte
+	for (unsigned int a=0;a<512;a++)
+		{
+		mmc_write_byte(*Buffer++);
+		}
+	
+	//CRC-Byte schreiben
+	mmc_write_byte(0xFF); //Schreibt Dummy CRC
+	mmc_write_byte(0xFF); //CRC Code wird nicht benutzt
+	
+	//Fehler beim schreiben? (Data Response XXX00101 = OK)
+	if((mmc_read_byte()&0x1F) != 0x05) return(1);
+
+	//Wartet auf MMC/SD-Karte Bussy
+	while (mmc_read_byte() != 0xff){};
+	
+	
+return(0);
+}
+
+//############################################################################
+//Routine zum lesen des CID Registers von der MMC/SD-Karte (16Bytes)
+void mmc_read_block(unsigned char *cmd,unsigned char *Buffer,unsigned int Bytes)
+//############################################################################
+{	
+	//Sendet Commando cmd an MMC/SD-Karte
+	if (mmc_write_command (cmd) != 0)
+			{
+			 return;
+			}
+
+	//Wartet auf Start Byte von der MMC/SD-Karte (FEh/Start Byte)
+	
+	while (mmc_read_byte() != 0xfe){};
+
+	//Lesen des Bolcks (normal 512Bytes) von MMC/SD-Karte
+	for (unsigned int a=0;a<Bytes;a++)
+		{
+		*Buffer++ = mmc_read_byte();
+		}
+	//CRC-Byte auslesen
+	mmc_read_byte();//CRC - Byte wird nicht ausgewertet
+	mmc_read_byte();//CRC - Byte wird nicht ausgewertet
+	
+	
+	return;
+}
+
+//############################################################################
+//Routine zum lesen eines Blocks(512Byte) von der MMC/SD-Karte
+unsigned char mmc_read_sector (unsigned long addr,unsigned char *Buffer)
+//############################################################################
+{	
+	//Commando 16 zum lesen eines Blocks von der MMC/SD - Karte
+	unsigned char cmd[] = {0x51,0x00,0x00,0x00,0x00,0xFF}; 
+	/*Die Adressierung der MMC/SD-Karte wird in Bytes angegeben,
+	  addr wird von Blocks zu Bytes umgerechnet danach werden 
+	  diese in das Commando eingefügt*/
+	  
+	addr = addr << 9; //addr = addr * 512
+
+	cmd[1] = ((addr & 0xFF000000) >>24 );
+	cmd[2] = ((addr & 0x00FF0000) >>16 );
+	cmd[3] = ((addr & 0x0000FF00) >>8 );
+
+	mmc_read_block(cmd,Buffer,512);
+
+	return(0);
+}
+
+//############################################################################
+//Routine zum lesen des CID Registers von der MMC/SD-Karte (16Bytes)
+unsigned char mmc_read_cid (unsigned char *Buffer)
+//############################################################################
+{
+	//Commando zum lesen des CID Registers
+	unsigned char cmd[] = {0x4A,0x00,0x00,0x00,0x00,0xFF}; 
+	
+	mmc_read_block(cmd,Buffer,16);
+
+	return(0);
+}
+
+//############################################################################
+//Routine zum lesen des CSD Registers von der MMC/SD-Karte (16Bytes)
+unsigned char mmc_read_csd (unsigned char *Buffer)
+//############################################################################
+{	
+	//Commando zum lesen des CSD Registers
+	unsigned char cmd[] = {0x49,0x00,0x00,0x00,0x00,0xFF};
+	
+	mmc_read_block(cmd,Buffer,16);
+	return(0);
+}
--- a/poc/poc_at644/mmc.h
+++ b/poc/poc_at644/mmc.h
@ -0,0 +1,57 @@
+/*#######################################################################################
+Connect ARM to MMC/SD 
+
+Copyright (C) 2004 Ulrich Radig
+#######################################################################################*/
+
+#ifndef _MMC_H_
+ #define _MMC_H_
+
+#include <avr/io.h>	
+
+//#define SPI_Mode			1		//1 = Hardware SPI | 0 = Software SPI
+#define SPI_Mode			0
+
+#define MMC_Write			PORTC	//Port an der die MMC/SD-Karte angeschlossen ist also des SPI 
+#define MMC_Read			PINC
+#define MMC_Direction_REG		DDRC	
+
+#if defined (__AVR_ATmega8__)
+#define MMC_CS  PC0
+#define MMC_DO  PC1
+#define MMC_DI  PC2
+#define MMC_CLK PC3
+        #define SPI_SS                          4               //Nicht Benutz muß aber definiert werden
+#endif
+
+
+//Prototypes
+extern unsigned char mmc_read_byte(void);
+
+extern void mmc_write_byte(unsigned char);
+
+extern void mmc_read_block(unsigned char *,unsigned char *,unsigned in);
+
+extern unsigned char mmc_init(void);
+
+extern unsigned char mmc_read_sector (unsigned long,unsigned char *);
+
+extern unsigned char mmc_write_sector (unsigned long,unsigned char *);
+
+extern unsigned char mmc_write_command (unsigned char *);
+
+extern unsigned char mmc_read_csd (unsigned char *);
+
+extern unsigned char mmc_read_cid (unsigned char *);
+
+//set MMC_Chip_Select to high (MMC/SD-Karte Inaktiv)
+#define MMC_Disable() MMC_Write|= (1<<MMC_CS);
+
+//set MMC_Chip_Select to low (MMC/SD-Karte Aktiv)
+#define MMC_Enable() MMC_Write&=~(1<<MMC_CS);
+
+#define nop()  __asm__ __volatile__ ("nop" ::)
+
+#endif //_MMC_H_
+
+