basic ROM & SRAM mirroring [refactoring needed]

src/Makefile

@@ -100,7 +100,7 @@ FORMAT = ihex
 TARGET = $(OBJDIR)/sd2snes
 
 # List C source files here. (C dependencies are automatically generated.)
-SRC = main.c ff.c utils.c timer.c led.c diskio.c sdcard.c spi.c crc7.c snes.c fpga.c memory.c crc16.c fileops.c fpga_spi.c
+SRC = main.c ff.c utils.c timer.c led.c diskio.c sdcard.c spi.c crc7.c snes.c fpga.c memory.c crc16.c fileops.c fpga_spi.c filetypes.c
 
 ifeq ($(CONFIG_UART_DEBUG),y)
   SRC += uart.c

src/fileops.c

@@ -1,5 +1,5 @@
-// insert cool lenghty disclaimer here
-// fileops.c: fatfs wrapping for convenience
+// insert cool lengthy disclaimer here
+// fileops.c: convenience
 
 #include "config.h"
 #include "uart.h"
@@ -29,3 +29,19 @@ UINT file_write() {
 	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_res) 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;
+}

src/fileops.h

@@ -15,4 +15,6 @@ void file_open(char* filename, BYTE flags);
 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

src/fpga_spi.c

@@ -6,8 +6,9 @@
 
 	cmd		param		function	
    =============================================
-	00		bb[hh[ll]]	set address to 0xbbhhll
-	2s		-			set SRAM size to s
+	00		bb[hh[ll]]	set address to 0xbb0000, 0xbbhh00, or 0xbbhhll
+	10		bbhhll		set SNES input address mask to 0xbbhhll
+	2s		bbhhll		set SRAM address mask for chip #s to 0xbbhhll
 	3m		-			set mapper to m
 						0=HiROM, 1=LoROM
 	80		-			read with increment
@@ -50,3 +51,20 @@ void set_avr_addr(uint32_t address) {
 	spi_sd();
 }
 
+void set_saveram_mask(uint32_t mask) {
+	spi_fpga();
+	spiTransferByte(0x20);
+	spiTransferByte((mask>>16)&0xff);
+	spiTransferByte((mask>>8)&0xff);
+	spiTransferByte((mask)&0xff);
+	spi_sd();
+}
+
+void set_rom_mask(uint32_t mask) {
+	spi_fpga();
+	spiTransferByte(0x10);
+	spiTransferByte((mask>>16)&0xff);
+	spiTransferByte((mask>>8)&0xff);
+	spiTransferByte((mask)&0xff);
+	spi_sd();
+}

src/fpga_spi.h

@@ -8,3 +8,6 @@ void fpga_spi_test(void);
 void spi_fpga(void);
 void spi_sd(void);
 void set_avr_addr(uint32_t);
+void set_saveram_mask(uint32_t);
+void set_rom_mask(uint32_t);
+

src/main.c

@@ -174,7 +174,6 @@ int main(void) {
 	load_sram("/test.srm");
 	uart_putc(']');
 	set_busy_led(0);
-	set_avr_mapper(0); 
 	set_avr_ena(1);
 	_delay_ms(100);
 	uart_puts_P(PSTR("SNES GO!"));

src/memory.c

@@ -1,5 +1,5 @@
-// insert cool lenghty disclaimer here
-// memory.c: ROM+RAM operations
+// insert cool lengthy disclaimer here
+// memory.c: SRAM operations
 
 #include <stdint.h>
 #include <avr/pgmspace.h>
@@ -14,24 +14,53 @@
 #include "fpga_spi.h"
 #include "avrcompat.h"
 #include "led.h"
+#include "filetypes.h"
+#include "fpga_spi.h"
 
 char* hex = "0123456789ABCDEF";
 
+void sram_readblock(void* buf, uint32_t addr, uint16_t size) {
+	uint16_t count=size;
+	void* tgt = buf;
+	set_avr_addr(addr);
+	spi_fpga();
+	spiTransferByte(0x81);	// READ
+	spiTransferByte(0x00);	// dummy
+	while(count--) {
+		*((uint8_t*)tgt++) = spiTransferByte(0x00);
+	}
+	spi_sd();
+}
+
+void sram_writeblock(void* buf, uint32_t addr, uint16_t size) {
+	uint16_t count=size;
+	void* src = buf;
+	set_avr_addr(addr);
+	spi_fpga();
+	spiTransferByte(0x91);	// WRITE 
+	while(count--) {
+		spiTransferByte(*((uint8_t*)src++));
+	}
+	spiTransferByte(0x00);	// dummy
+	spi_sd();
+}
+
 uint32_t load_rom(char* filename) {
 // TODO Mapper, Mirroring, Bankselect
-//	snes_rom_properties_t romprops;
+	snes_romprops_t romprops;
 //	set_avr_bank(0);
 	UINT bytes_read;
 	DWORD filesize;
 	UINT count=0;
 	file_open(filename, FA_READ);
 	filesize = file_handle.fsize;
+	smc_id(&romprops);
 	if(file_res) {
 		uart_putc('?');
 		uart_putc(0x30+file_res);
 		return 0;
 	}
-//	snes_rom_id(&romprops, &file_handle);
+	f_lseek(&file_handle, romprops.offset);
 	for(;;) {
 		FPGA_SS_HIGH();
 		SPI_SS_LOW();
@@ -46,14 +75,35 @@ uint32_t load_rom(char* filename) {
 		}
 		for(int j=0; j<bytes_read; j++) {
 			spiTransferByte(file_buf[j]);
-//			uart_putc((file_buf[j] > 0x20)
-//						&& (file_buf[j] < ('z'+1)) ? file_buf[j]:'.');
-//			_delay_ms(2);
 		}
 		spiTransferByte(0x00); // dummy tx for increment+write pulse
 		FPGA_SS_HIGH();
 	}
 	file_close();
+	set_avr_mapper(romprops.mapper_id);
+	uart_puthex(romprops.header.map);
+	uart_putc(0x30+romprops.mapper_id);
+
+	uint32_t rammask;
+	uint32_t rommask;
+	if(romprops.header.ramsize == 0) {
+		rammask = 0;
+	} else {
+		rammask = ((uint32_t)1024 << (romprops.header.ramsize)) - 1;
+	}
+	rommask = ((uint32_t)1024 << (romprops.header.romsize)) - 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;
 }
 

src/uart.c

@@ -72,6 +72,13 @@ void uart_puthex(uint8_t num) {
     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_trace(void *ptr, uint16_t start, uint16_t len) {
   uint16_t i;
   uint8_t j;

src/uart.h

@@ -35,6 +35,7 @@ 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_trace(void *ptr, uint16_t start, uint16_t len);
 void uart_flush(void);
 void uart_puts_P(prog_char *text);