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V27A: Add Mega Drive SRAM read/write
Only tested with the game STRIKER. There are probably multiple types of SRAM games so not all will work yet.
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sanni
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@ -2,8 +2,8 @@
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Cartridge Reader for Arduino Mega2560
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Author: sanni
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Date: 2017-06-26
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Version: V27
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Date: 2017-06-27
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Version: V27A
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SD lib: https://github.com/greiman/SdFat
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LCD lib: https://github.com/adafruit/Adafruit_SSD1306
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@ -34,7 +34,7 @@
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YamaArashi - GBA flashrom bank switch command
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**********************************************************************************/
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char ver[5] = "V27";
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char ver[5] = "V27A";
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/******************************************
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Define Output
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@ -192,6 +192,7 @@ char cartID[5];
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unsigned long cartSize;
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char flashid[5];
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unsigned long fileSize;
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unsigned long sramBase;
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// Variable to count errors
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unsigned long writeErrors;
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@ -2,6 +2,11 @@
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// SEGA MEGA DRIVE
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//******************************************
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/******************************************
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Variables
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*****************************************/
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unsigned long sramEnd;
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/******************************************
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Menu
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*****************************************/
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@ -18,7 +23,7 @@ void mdMenu() {
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unsigned char mainMenu;
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// Copy menuOptions out of progmem
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convertPgm(menuOptionsMD, 5);
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mainMenu = question_box("MEGA DRIVE Reader", menuOptions, 1, 0);
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mainMenu = question_box("MEGA DRIVE Reader", menuOptions, 3, 0);
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// wait for user choice to come back from the question box menu
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switch (mainMenu)
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@ -31,45 +36,50 @@ void mdMenu() {
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//compare_checksum_MD();
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break;
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/*case 1:
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case 1:
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display_Clear();
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// Does cartridge have SRAM
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if ((saveType == 1) || (saveType == 2)) {
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// Change working dir to root
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sd.chdir("/");
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println_Msg(F("Reading Sram..."));
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display_Update();
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readSram_MD();
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}
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else {
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print_Error(F("Cart has no Sram"), false);
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}
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break;
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case 2:
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display_Clear();
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// Does cartridge have SRAM
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if ((saveType == 1) || (saveType == 2)) {
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// Change working dir to root
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sd.chdir("/");
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// Launch file browser
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fileBrowser("Select srm file");
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display_Clear();
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// Does cartridge have SRAM
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if () {
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// Change working dir to root
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sd.chdir("/");
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readSRAM_MD();
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writeSram_MD();
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writeErrors = verifySram_MD();
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if (writeErrors == 0) {
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println_Msg(F("Sram verified OK"));
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display_Update();
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}
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else {
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print_Error(F("Cart has no Sram"), false);
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print_Msg(F("Error: "));
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print_Msg(writeErrors);
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println_Msg(F(" bytes "));
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print_Error(F("did not verify."), false);
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}
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break;
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}
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else {
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print_Error(F("Cart has no Sram"), false);
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}
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break;
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case 2:
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display_Clear();
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// Does cartridge have SRAM
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if () {
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// Change working dir to root
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sd.chdir("/");
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writeSRAM_MD();
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unsigned long wrErrors;
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wrErrors = verifySRAM_MD();
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if (wrErrors == 0) {
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println_Msg(F("Verified OK"));
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display_Update();
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}
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else {
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print_Msg(F("Error: "));
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print_Msg(wrErrors);
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println_Msg(F(" bytes "));
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print_Error(F("did not verify."), false);
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}
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}
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else {
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print_Error(F("Cart has no Sram"), false);
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}
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break;
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case 3:
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/*case 3:
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// Change working dir to root
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sd.chdir("/");
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writeFlash_MD();
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@ -134,7 +144,7 @@ void writeWord_MD(unsigned long myAddress, word myData) {
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// Arduino running at 16Mhz -> one nop = 62.5ns
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// Wait till output is stable
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__asm__("nop\n\t");
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__asm__("nop\n\t""nop\n\t");
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// Switch WR(PH5) to LOW
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PORTH &= ~(1 << 5);
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@ -155,7 +165,7 @@ word readWord_MD(unsigned long myAddress) {
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PORTL = (myAddress >> 16) & 0xFF;
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// Arduino running at 16Mhz -> one nop = 62.5ns
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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__asm__("nop\n\t""nop\n\t");
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// Setting OE(PH6) LOW
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PORTH &= ~(1 << 6);
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@ -188,8 +198,40 @@ void dataIn_MD() {
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MEGA DRIVE functions
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*****************************************/
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void getCartInfo_MD() {
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// Set control
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dataIn_MD();
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cartSize = ((long(readWord_MD(0xD2)) << 16) | readWord_MD(0xD3)) + 1;
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sramSize = ((long(readWord_MD(0xDC)) << 16) | readWord_MD(0xDD)) - ((long(readWord_MD(0xDA)) << 16) | readWord_MD(0xDB)) + 2;
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// Check if cart has sram
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if ((readWord_MD(0xD8) == 0x5241) && (readWord_MD(0xD9) == 0xF820)) {
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// Get sram start and end
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sramBase = ((long(readWord_MD(0xDA)) << 16) | readWord_MD(0xDB));
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sramEnd = ((long(readWord_MD(0xDC)) << 16) | readWord_MD(0xDD));
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// Check alignment of sram
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if (sramBase == 0x200001) {
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// low byte
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saveType = 1;
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sramSize = (sramEnd - sramBase + 2) / 2;
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// Right shift sram base address so [A21] is set to high 0x200000 = 0b001[0]00000000000000000000
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sramBase = sramBase >> 1;
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}
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else if (sramBase == 0x200000) {
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// high byte
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saveType = 2;
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sramSize = (sramEnd - sramBase + 1) / 2;
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// Right shift sram base address so [A21] is set to high 0x200000 = 0b001[0]00000000000000000000
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sramBase = sramBase / 2;
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}
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else
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print_Error(F("Unknown Sram Base"), true);
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}
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else {
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// Either no save or eeprom save
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saveType = 0;
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sramSize = 0;
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}
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// Get name
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for (byte c = 0; c < 48; c += 2) {
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@ -219,12 +261,16 @@ void getCartInfo_MD() {
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print_Msg(cartSize / 1024 / 1024);
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println_Msg(F("MB"));
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print_Msg(F("Sram: "));
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print_Msg(sramSize / 1024);
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println_Msg(F("KB"));
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if (sramSize > 0) {
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print_Msg(sramSize / 1024);
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println_Msg(F("KB"));
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}
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else
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println_Msg(F("None"));
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println_Msg(F(" "));
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// Wait for user input
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if (enable_OLED) {
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println_Msg(F(" "));
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println_Msg(F("Press Button..."));
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display_Update();
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wait();
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@ -233,6 +279,9 @@ void getCartInfo_MD() {
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// Read rom and save to the SD card
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void readROM_MD() {
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// Set control
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dataIn_MD();
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// Get name, add extension and convert to char array for sd lib
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strcpy(fileName, romName);
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strcat(fileName, ".MD");
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@ -280,3 +329,126 @@ void readROM_MD() {
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myFile.close();
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}
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/******************************************
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SRAM functions
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*****************************************/
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// Write sram to cartridge
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void writeSram_MD() {
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dataOut_MD();
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// Create filepath
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sprintf(filePath, "%s/%s", filePath, fileName);
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println_Msg(F("Writing..."));
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println_Msg(filePath);
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display_Update();
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// Open file on sd card
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if (myFile.open(filePath, O_READ)) {
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// Write to the lower byte
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if (saveType == 1) {
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for (unsigned long currByte = sramBase; currByte < sramBase + sramSize; currByte++) {
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writeWord_MD(currByte, (myFile.read() & 0xFF));
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}
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}
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// Write to the upper byte
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else if (saveType == 2) {
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for (unsigned long currByte = sramBase; currByte < sramBase + sramSize; currByte++) {
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writeWord_MD(currByte, ((myFile.read() << 8 ) & 0xFF));
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}
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}
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else
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print_Error(F("Unknown save type"), false);
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// Close the file:
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myFile.close();
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println_Msg(F("Done"));
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display_Update();
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}
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else {
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print_Error(F("SD Error"), true);
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}
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dataIn_MD();
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}
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// Read sram and save to the SD card
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void readSram_MD() {
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dataIn_MD();
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// Get name, add extension and convert to char array for sd lib
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strcpy(fileName, romName);
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strcat(fileName, ".srm");
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// create a new folder for the save file
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EEPROM_readAnything(10, foldern);
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sprintf(folder, "MD/SAVE/%s/%d", romName, foldern);
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sd.mkdir(folder, true);
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sd.chdir(folder);
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// write new folder number back to eeprom
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foldern = foldern + 1;
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EEPROM_writeAnything(10, foldern);
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// Open file on sd card
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if (!myFile.open(fileName, O_RDWR | O_CREAT)) {
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print_Error(F("SD Error"), true);
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}
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for (unsigned long currBuffer = sramBase; currBuffer < sramBase + sramSize; currBuffer += 512) {
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for (int currWord = 0; currWord < 512; currWord++) {
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word myWord = readWord_MD(currBuffer + currWord);
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if (saveType == 2) {
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// Only use the upper byte
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sdBuffer[currWord] = (( myWord >> 8 ) & 0xFF);
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}
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else if (saveType == 1) {
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// Only use the lower byte
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sdBuffer[currWord] = (myWord & 0xFF);
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}
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}
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myFile.write(sdBuffer, 512);
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}
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// Close the file:
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myFile.close();
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print_Msg(F("Saved to "));
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print_Msg(folder);
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println_Msg(F("/"));
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display_Update();
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}
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unsigned long verifySram_MD() {
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dataIn_MD();
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writeErrors = 0;
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// Open file on sd card
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if (myFile.open(filePath, O_READ)) {
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for (unsigned long currBuffer = sramBase; currBuffer < sramBase + sramSize; currBuffer += 512) {
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for (int currWord = 0; currWord < 512; currWord++) {
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word myWord = readWord_MD(currBuffer + currWord);
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if (saveType == 2) {
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// Only use the upper byte
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sdBuffer[currWord] = (( myWord >> 8 ) & 0xFF);
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}
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else if (saveType == 1) {
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// Only use the lower byte
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sdBuffer[currWord] = (myWord & 0xFF);
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}
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}
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// Check sdBuffer content against file on sd card
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for (int i = 0; i < 512; i++) {
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if (myFile.read() != sdBuffer[i]) {
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writeErrors++;
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}
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}
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}
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// Close the file:
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myFile.close();
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}
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else {
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print_Error(F("SD Error"), true);
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}
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// Return 0 if verified ok, or number of errors
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return writeErrors;
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}
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@ -37,7 +37,6 @@ String lastbutton = "N/A";
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// Rom base address
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unsigned long romBase = 0x10000000;
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unsigned long sramBase = 0x08000000;
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// Flashram type
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byte flashramType = 1;
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@ -277,6 +276,9 @@ void setup_N64_Cart() {
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// Activate Internal Pullup Resistors
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//PORTH |= (1 << 4);
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// Set sram base address
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sramBase = 0x08000000;
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// Wait until all is stable
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delay(300);
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