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Add support for the Game Boy MBC6 mapper (save read)

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This commit is contained in:
Lesserkuma 2022-09-28 18:00:16 +02:00
parent 38c2262f1c
commit f7d9051b95
1 changed files with 203 additions and 2 deletions
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205
Cart_Reader/GB.ino
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@ -309,7 +309,10 @@ void gbMenu() {
if (lastByte > 0) {
// Change working dir to root
sd.chdir("/");
readSRAM_GB();
if (romType == 32)
readSRAMFLASH_GB_MBC6();
else
readSRAM_GB();
}
else {
print_Error(F("No save or unsupported type"), false);
@ -821,7 +824,13 @@ void getCartInfo_GB() {
else if (sramSize > 1) {
lastByte = 0xBFFF;
}
// MBC6
if (romType == 32) {
sramBanks = 8;
lastByte = 0xAFFF;
}
// Get Checksum as string
eepbit[6] = sdBuffer[0x14E];
eepbit[7] = sdBuffer[0x14F];
@ -1259,6 +1268,198 @@ unsigned long verifySRAM_GB() {
}
}
// Read SRAM + FLASH save data of MBC6
void readSRAMFLASH_GB_MBC6() {
// Get name, add extension and convert to char array for sd lib
strcpy(fileName, romName);
strcat(fileName, ".sav");
// create a new folder for the save file
EEPROM_readAnything(0, foldern);
sprintf(folder, "GB/SAVE/%s/%d", romName, foldern);
sd.mkdir(folder, true);
sd.chdir(folder);
display_Clear();
print_Msg(F("Saving to "));
print_Msg(folder);
println_Msg(F("/..."));
display_Update();
// write new folder number back to eeprom
foldern = foldern + 1;
EEPROM_writeAnything(0, foldern);
//open file on sd card
if (!myFile.open(fileName, O_RDWR | O_CREAT)) {
print_Error(F("SD Error"), true);
}
//Initialize progress bar
uint32_t processedProgressBar = 0;
uint32_t totalProgressBar = 0x108000;
draw_progressbar(0, totalProgressBar);
// Enable Mapper and SRAM
writeByte_GB(0x0000, 0x0A);
// Switch SRAM banks
for (byte currBank = 0; currBank < sramBanks; currBank++) {
writeByte_GB(0x0400, currBank);
writeByte_GB(0x0800, currBank);
// Read SRAM
for (word sramAddress = 0xA000; sramAddress <= lastByte; sramAddress += 64) {
for (byte i = 0; i < 64; i++) {
sdBuffer[i] = readByteSRAM_GB(sramAddress + i);
}
myFile.write(sdBuffer, 64);
processedProgressBar += 64;
draw_progressbar(processedProgressBar, totalProgressBar);
}
}
// Disable SRAM
writeByte_GB(0x0000, 0x00);
// Enable flash save memory (map to ROM)
writeByte_GB(0x1000, 0x01);
writeByte_GB(0x0C00, 0x01);
writeByte_GB(0x1000, 0x00);
writeByte_GB(0x2800, 0x08);
writeByte_GB(0x3800, 0x08);
word romAddress = 0x4000;
for (byte currBank = 0; currBank < 128; currBank++) {
writeByte_GB(0x2800, 8);
writeByte_GB(0x3800, 8);
writeByte_GB(0x2000, currBank);
writeByte_GB(0x3000, currBank);
romAddress = 0x4000;
// Read banks and save to SD
while (romAddress <= 0x5FFF) {
for (int i = 0; i < 512; i++) {
sdBuffer[i] = readByte_GB(romAddress + i);
}
myFile.write(sdBuffer, 512);
romAddress += 512;
processedProgressBar += 512;
draw_progressbar(processedProgressBar, totalProgressBar);
}
}
// Disable flash save memory
writeByte_GB(0x1000, 0x01);
writeByte_GB(0x0C00, 0x00);
writeByte_GB(0x1000, 0x00);
writeByte_GB(0x2800, 0x00);
writeByte_GB(0x3800, 0x00);
// Close the file:
myFile.close();
// Signal end of process
println_Msg(F("OK"));
display_Update();
}
// Read SRAM + FLASH save data of MBC6
void readSRAMFLASH_GB_MBC6() {
// Get name, add extension and convert to char array for sd lib
strcpy(fileName, romName);
strcat(fileName, ".sav");
// create a new folder for the save file
EEPROM_readAnything(0, foldern);
sprintf(folder, "GB/SAVE/%s/%d", romName, foldern);
sd.mkdir(folder, true);
sd.chdir(folder);
display_Clear();
print_Msg(F("Saving to "));
print_Msg(folder);
println_Msg(F("/..."));
display_Update();
// write new folder number back to eeprom
foldern = foldern + 1;
EEPROM_writeAnything(0, foldern);
//open file on sd card
if (!myFile.open(fileName, O_RDWR | O_CREAT)) {
print_Error(F("SD Error"), true);
}
//Initialize progress bar
uint32_t processedProgressBar = 0;
uint32_t totalProgressBar = 0x108000;
draw_progressbar(0, totalProgressBar);
// Enable Mapper and SRAM
writeByte_GB(0x0000, 0x0A);
// Switch SRAM banks
for (byte currBank = 0; currBank < sramBanks; currBank++) {
writeByte_GB(0x0400, currBank);
writeByte_GB(0x0800, currBank);
// Read SRAM
for (word sramAddress = 0xA000; sramAddress <= lastByte; sramAddress += 64) {
for (byte i = 0; i < 64; i++) {
sdBuffer[i] = readByteSRAM_GB(sramAddress + i);
}
myFile.write(sdBuffer, 64);
processedProgressBar += 64;
draw_progressbar(processedProgressBar, totalProgressBar);
}
}
// Disable SRAM
writeByte_GB(0x0000, 0x00);
// Enable flash save memory (map to ROM)
writeByte_GB(0x1000, 0x01);
writeByte_GB(0x0C00, 0x01);
writeByte_GB(0x1000, 0x00);
writeByte_GB(0x2800, 0x08);
writeByte_GB(0x3800, 0x08);
word romAddress = 0x4000;
for (byte currBank = 0; currBank < 128; currBank++) {
writeByte_GB(0x2800, 8);
writeByte_GB(0x3800, 8);
writeByte_GB(0x2000, currBank);
writeByte_GB(0x3000, currBank);
romAddress = 0x4000;
// Read banks and save to SD
while (romAddress <= 0x5FFF) {
for (int i = 0; i < 512; i++) {
sdBuffer[i] = readByte_GB(romAddress + i);
}
myFile.write(sdBuffer, 512);
romAddress += 512;
processedProgressBar += 512;
draw_progressbar(processedProgressBar, totalProgressBar);
}
}
// Disable flash save memory
writeByte_GB(0x1000, 0x01);
writeByte_GB(0x0C00, 0x00);
writeByte_GB(0x1000, 0x00);
writeByte_GB(0x2800, 0x00);
writeByte_GB(0x3800, 0x00);
// Close the file:
myFile.close();
// Signal end of process
println_Msg(F("OK"));
display_Update();
}
/******************************************
29F016/29F032/29F033 flashrom functions
*****************************************/