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allow cartridge to handle ppu r/w

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This commit is contained in:
Daniel Bauer
2020-01-18 21:58:13 +01:00
parent 624791d429
commit 0a16eefab1
4 changed files with 51 additions and 21 deletions
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14
src/nes/ppubus.rs
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@@ -35,6 +35,13 @@ impl PPUBus {
impl PPUMemory for PPUBus {
fn readb_ppu(&self, addr: Addr) -> Byte {
// give the cartridge a chance to handle it
if let Some(cartridge) = &self.cartridge {
if let Some(data) = cartridge.borrow().readb_ppu(addr) {
return data
}
}
if PATTERN_ADDR_RANGE[0] <= addr && addr <= PATTERN_ADDR_RANGE[1] {
let table = if addr < 0x1000 { 0 } else { 1 };
return self.pattern_memory[table as usize][(addr % 0x1000) as usize]
@@ -60,6 +67,13 @@ impl PPUMemory for PPUBus {
0x00
}
fn writeb_ppu(&mut self, addr: Addr, data: Byte) {
// give the cartridge a chance to handle it
if let Some(cartridge) = &self.cartridge {
if cartridge.borrow_mut().writeb_ppu(addr, data) {
return
}
}
if PATTERN_ADDR_RANGE[0] <= addr && addr <= PATTERN_ADDR_RANGE[1] {
let table = if addr < 0x1000 { 0 } else { 1 };
self.pattern_memory[table as usize][(addr % 0x1000) as usize] = data;