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Disable SRAM when flashing 2x2MB repro

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sanni 2024-06-29 20:29:38 +02:00
parent 4e7ef93cc6
commit 27b84d2f7e
1 changed files with 10 additions and 6 deletions
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16
Cart_Reader/FLASH.ino
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@ -881,7 +881,7 @@ void writeByte_Flash(unsigned long myAddress, byte myData) {
// A15-A22 // A15-A22
PORTL = (myAddress >> 15) & 0xFF; PORTL = (myAddress >> 15) & 0xFF;
// Flip A22(PL7) to reverse P0 and P1 roms // Flip A22(PL7) to reverse P0 and P1 roms
PORTL ^= (1 << PL7); PORTL ^= (1 << 7);
} }
// for SNES ExHiRom repro // for SNES ExHiRom repro
else if (mapping == 3) { else if (mapping == 3) {
@ -909,7 +909,7 @@ void writeByte_Flash(unsigned long myAddress, byte myData) {
// A15-A22 // A15-A22
PORTL = (myAddress >> 15) & 0xFF; PORTL = (myAddress >> 15) & 0xFF;
// Flip BA6(PL6) to address second rom chip // Flip BA6(PL6) to address second rom chip
PORTL ^= (1 << PL6); PORTL ^= (1 << 6);
} }
// for SNES HiRom repro with 2x 2MB // for SNES HiRom repro with 2x 2MB
else if (mapping == 5) { else if (mapping == 5) {
@ -918,7 +918,9 @@ void writeByte_Flash(unsigned long myAddress, byte myData) {
// A16-A23 // A16-A23
PORTL = (myAddress >> 16) & 0xFF; PORTL = (myAddress >> 16) & 0xFF;
// Flip BA5(PL5) to address second rom chip // Flip BA5(PL5) to address second rom chip
PORTL ^= (1 << PL5); PORTL ^= (1 << 5);
// Switch SNES BA6(PL6) to HIGH to disable SRAM
PORTL |= (1 << 6);
} }
// Data // Data
@ -985,7 +987,7 @@ byte readByte_Flash(unsigned long myAddress) {
// A15-A22 // A15-A22
PORTL = (myAddress >> 15) & 0xFF; PORTL = (myAddress >> 15) & 0xFF;
// Flip A22(PL7) to reverse P0 and P1 roms // Flip A22(PL7) to reverse P0 and P1 roms
PORTL ^= (1 << PL7); PORTL ^= (1 << 7);
} }
// for SNES ExHiRom repro // for SNES ExHiRom repro
else if (mapping == 3) { else if (mapping == 3) {
@ -1013,7 +1015,7 @@ byte readByte_Flash(unsigned long myAddress) {
// A15-A22 // A15-A22
PORTL = (myAddress >> 15) & 0xFF; PORTL = (myAddress >> 15) & 0xFF;
// Flip BA6(PL6) to address second rom chip // Flip BA6(PL6) to address second rom chip
PORTL ^= (1 << PL6); PORTL ^= (1 << 6);
} }
// for SNES HiRom repro with 2x 2MB // for SNES HiRom repro with 2x 2MB
else if (mapping == 5) { else if (mapping == 5) {
@ -1022,7 +1024,9 @@ byte readByte_Flash(unsigned long myAddress) {
// A16-A23 // A16-A23
PORTL = (myAddress >> 16) & 0xFF; PORTL = (myAddress >> 16) & 0xFF;
// Flip BA5(PL5) to address second rom chip // Flip BA5(PL5) to address second rom chip
PORTL ^= (1 << PL5); PORTL ^= (1 << 5);
// Switch SNES BA6(PL6) to HIGH to disable SRAM
PORTL |= (1 << 6);
} }
// Arduino running at 16Mhz -> one nop = 62.5ns // Arduino running at 16Mhz -> one nop = 62.5ns