bsnes/fc/cartridge/board/konami-vrc2.cpp

56 lines
1.4 KiB
C++

struct KonamiVRC2 : Board {
KonamiVRC2(Markup::Node& document) : Board(document), vrc2(*this) {
settings.pinout.a0 = 1 << document["cartridge/chip/pinout/a0"].natural();
settings.pinout.a1 = 1 << document["cartridge/chip/pinout/a1"].natural();
}
auto prg_read(uint addr) -> uint8 {
if(addr < 0x6000) return cpu.mdr();
if(addr < 0x8000) return vrc2.ram_read(addr);
return prgrom.read(vrc2.prg_addr(addr));
}
auto prg_write(uint addr, uint8 data) -> void {
if(addr < 0x6000) return;
if(addr < 0x8000) return vrc2.ram_write(addr, data);
bool a0 = (addr & settings.pinout.a0);
bool a1 = (addr & settings.pinout.a1);
addr &= 0xfff0;
addr |= (a0 << 0) | (a1 << 1);
return vrc2.reg_write(addr, data);
}
auto chr_read(uint addr) -> uint8 {
if(addr & 0x2000) return ppu.ciram_read(vrc2.ciram_addr(addr));
return Board::chr_read(vrc2.chr_addr(addr));
}
auto chr_write(uint addr, uint8 data) -> void {
if(addr & 0x2000) return ppu.ciram_write(vrc2.ciram_addr(addr), data);
return Board::chr_write(vrc2.chr_addr(addr), data);
}
auto power() -> void {
vrc2.power();
}
auto reset() -> void {
vrc2.reset();
}
auto serialize(serializer& s) -> void {
Board::serialize(s);
vrc2.serialize(s);
}
struct Settings {
struct Pinout {
uint a0;
uint a1;
} pinout;
} settings;
VRC2 vrc2;
};