mapper_0007.c


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static void mapper_0007_init(struct nes_state *state) {
	state->map.m0007.prg_ptr = state->prg_rom;
	state->map.m0007.mirroring = 0;
}

static uint8_t mapper_0007_prg_read(struct nes_state *state, uint32_t addr) {
	if(addr >= 0x8000) {
		return state->map.m0007.prg_ptr[addr - 0x8000];
	}
	return 0;
}

static void mapper_0007_prg_write(struct nes_state *state, uint32_t addr, uint8_t value) {
	if(addr >= 0x8000) {
		state->map.m0007.prg_ptr = state->prg_rom + ((value & 0x07) * 0x8000);
		state->map.m0007.mirroring = (value & 0x10) ? 1 : 0;
	}
}

static uint8_t mapper_0007_chr_read(struct nes_state *state, uint32_t addr) {
	return state->chr_ram[addr];
}

static void mapper_0007_chr_write(struct nes_state *state, uint32_t addr, uint8_t value) {
	state->chr_ram[addr] = value;
}

static uint8_t mapper_0007_ciram_read(struct nes_state *state, uint32_t addr) {
	if(state->map.m0007.mirroring == 0) {
		addr = (addr & 0x800) | (addr & 0x3ff);
	} else {
		addr = addr & 0x7ff;
	}
	return state->ciram[addr];
}

static void mapper_0007_ciram_write(struct nes_state *state, uint32_t addr, uint8_t value) {
	if(state->map.m0007.mirroring == 0) {
		addr = (addr & 0x800) | (addr & 0x3ff);
	} else {
		addr = addr & 0x7ff;
	}
	state->ciram[addr] = value;
}