mirror of https://github.com/bsnes-emu/bsnes.git
87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
auto Cartridge::MBC7::read(uint16 address) -> uint8 {
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if((address & 0xc000) == 0x0000) { //$0000-3fff
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return cartridge.rom.read(address.bits(0,13));
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}
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if((address & 0xc000) == 0x4000) { //$4000-7fff
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return cartridge.rom.read(io.rom.bank << 14 | address.bits(0,13));
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}
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if((address & 0xf000) == 0xa000) { //$a000-afff
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if(!io.ram.enable[0] || !io.ram.enable[1]) return 0xff;
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switch(address.bits(4,7)) {
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case 2: return io.accelerometer.x.bits(0, 7);
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case 3: return io.accelerometer.x.bits(8,15);
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case 4: return io.accelerometer.y.bits(0, 7);
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case 5: return io.accelerometer.y.bits(8,15);
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case 6: return 0x00; //z?
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case 7: return 0xff; //z?
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case 8: return 0xff;
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}
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return 0xff;
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}
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return 0xff;
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}
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auto Cartridge::MBC7::write(uint16 address, uint8 data) -> void {
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if((address & 0xe000) == 0x0000) { //$0000-1fff
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io.ram.enable[0] = data.bits(0,3) == 0xa;
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if(!io.ram.enable[0]) io.ram.enable[1] = false;
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return;
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}
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if((address & 0xe000) == 0x2000) { //$2000-3fff
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io.rom.bank = data;
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if(!io.rom.bank) io.rom.bank = 1;
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return;
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}
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if((address & 0xe000) == 0x4000) { //$4000-5fff
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if(!io.ram.enable[0]) return;
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io.ram.enable[1] = data == 0x40;
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}
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if((address & 0xf000) == 0xa000) { //$a000-afff
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if(!io.ram.enable[0] || !io.ram.enable[1]) return;
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switch(address.bits(4,7)) {
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case 0: {
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if(data != 0x55) break;
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io.accelerometer.x = 0x8000;
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io.accelerometer.y = 0x8000;
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break;
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}
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case 1: {
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if(data != 0xaa) break;
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io.accelerometer.x = 0x8000 + platform->inputPoll(ID::Port::Hardware, ID::Device::Controls, 8);
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io.accelerometer.y = 0x8000 + platform->inputPoll(ID::Port::Hardware, ID::Device::Controls, 9);
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break;
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}
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case 8: {
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break;
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}
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}
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return;
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}
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}
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auto Cartridge::MBC7::power() -> void {
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io = {};
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}
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auto Cartridge::MBC7::serialize(serializer& s) -> void {
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s.integer(io.rom.bank);
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s.integer(io.ram.enable[0]);
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s.integer(io.ram.enable[1]);
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s.integer(io.accelerometer.x);
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s.integer(io.accelerometer.y);
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}
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