448i mode (select button), sram reliability checking

src/main.c

@@ -245,11 +245,13 @@ int main(void) {
 		
 	}
 	dprintf("cmd was %x, going to snes main loop\n", cmd);
+	led_std();
 	cmd=0;
 	while(1) {
 		if(get_snes_reset()) {
 			dprintf("RESET\n");
 		}
+		sram_reliable();
 		snes_main_loop();
 	}
 

src/memory.c

@@ -218,30 +218,30 @@ uint32_t load_sram(uint8_t* filename, uint32_t base_addr) {
 
 
 void save_sram(uint8_t* filename, uint32_t sram_size, uint32_t base_addr) {
-    uint32_t count = 0;
+	uint32_t count = 0;
 	uint32_t num = 0;
 
 	spi_none();
-    file_open(filename, FA_CREATE_ALWAYS | FA_WRITE);
+	file_open(filename, FA_CREATE_ALWAYS | FA_WRITE);
 	if(file_res) {
 		uart_putc(0x30+file_res);
 	}
-    while(count<sram_size) {
+	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++;
-        }
+		for(int j=0; j<sizeof(file_buf); j++) {
+			file_buf[j] = spiTransferByte(0x00);
+			count++;
+		}
 		spi_none();
-        num = file_write();
+		num = file_write();
 		if(file_res) {
 			uart_putc(0x30+file_res);
 		}
-    }
-    file_close();
+	}
+	file_close();
 }
 
 
@@ -269,13 +269,27 @@ uint32_t calc_sram_crc(uint32_t base_addr, uint32_t size) {
 
 uint8_t sram_reliable() {
 	uint16_t score=0;
-	uint32_t val = sram_readlong(SRAM_SCRATCHPAD);
-	while(score<SRAM_RELIABILITY_SCORE) {
+//	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++) {
+		if(sram_readlong(SRAM_SCRATCHPAD)==0x12345678) {
+			score++;
+		}
 	}
-	return 1;
+	if(score<SRAM_RELIABILITY_SCORE) {
+		result = 0;
+		dprintf("score=%d\n", score);
+	} else {
+		result = 1;
+	}
+	set_pwr_led(result);
+	return result;
 }

src/snes.c

@@ -56,13 +56,15 @@ uint8_t get_snes_reset() {
  * monitors SRAM changes and other things
  */
 uint32_t diffcount = 0, samecount = 0;
+uint8_t sram_valid = 0;
 void snes_main_loop() {
 	if(initloop) {
 		saveram_crc_old = calc_sram_crc(saveram_base_addr, saveram_size);
 		initloop=0;
 	}
 	saveram_crc = calc_sram_crc(saveram_base_addr, saveram_size);
-	if(crc_valid) {
+	sram_valid = sram_reliable();
+	if(crc_valid && sram_valid) {
 		if(saveram_crc != saveram_crc_old) {
 			if(samecount) {
 				diffcount=1;
@@ -84,7 +86,7 @@ void snes_main_loop() {
 		}
 		saveram_crc_old = saveram_crc;
 	}
-	dprintf("valid=%d diffcount=%ld samecount=%ld\n", crc_valid, diffcount, samecount);
+	dprintf("crc_valid=%d sram_valid=%d diffcount=%ld samecount=%ld\n", crc_valid, sram_valid, diffcount, samecount);
 }
 
 /*
@@ -96,6 +98,7 @@ uint8_t menu_main_loop() {
 	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()) {