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added ppu register access

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Lauchmelder 2021-10-23 20:16:29 +02:00
parent 19d138fb5f
commit 7c0957325f
7 changed files with 113 additions and 19 deletions
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16
NES Emulator/bus.c
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@ -33,15 +33,15 @@ struct Bus* createBus()
}
memset(bus->ram, 0x00, 0x18);
// Create and insert cartridge
bus->cartridge = createCartridge(bus, "roms/nestest.nes");
// Create CPU and attach it
bus->cpu = createCPU(bus);
// Create PPU and attack it
bus->ppu = createPPU(bus);
// Create and insert cartridge
bus->cartridge = createCartridge(bus, "roms/nestest.nes");
printf("Reset vector: $%x\n", ((Word)readCartridge(bus->cartridge, 0xFFFD) << 8) | (readCartridge(bus->cartridge, 0xFFFC)));
return bus;
@ -49,9 +49,9 @@ struct Bus* createBus()
void destroyBus(struct Bus* bus)
{
destroyCartridge(bus->cartridge);
destroyPPU(bus->ppu);
destroyCPU(bus->cpu);
destroyCartridge(bus->cartridge);
free(bus->io);
free(bus->ram);
@ -67,6 +67,10 @@ Byte readBus(struct Bus* bus, Word addr)
{
val = bus->ram[addr & 0x7FF];
}
else if (0x2000 <= addr && addr < 0x4000)
{
val = ppuRead(bus->ppu, addr & 0x2007);
}
else if (0x4000 <= addr && addr <= 0x4017) // I/O space
{
val = bus->io[addr - 0x4000];
@ -91,6 +95,10 @@ void writeBus(struct Bus* bus, Word addr, Byte val)
{
bus->ram[addr & 0x7FF] = val;
}
else if (0x2000 <= addr && addr < 0x4000)
{
ppuWrite(bus->ppu, addr & 0x2007, val);
}
else if (0x4000 <= addr && addr <= 0x4017) // I/O space
{
bus->io[addr - 0x4000] = val;