mirror of https://github.com/bsnes-emu/bsnes.git
73 lines
1.3 KiB
C++
73 lines
1.3 KiB
C++
#include <md/md.hpp>
|
|
|
|
namespace MegaDrive {
|
|
|
|
APU apu;
|
|
#include "bus.cpp"
|
|
#include "serialization.cpp"
|
|
|
|
auto APU::Enter() -> void {
|
|
while(true) scheduler.synchronize(), apu.main();
|
|
}
|
|
|
|
auto APU::main() -> void {
|
|
if(!state.enabled) {
|
|
return step(1);
|
|
}
|
|
|
|
if(state.nmiLine) {
|
|
state.nmiLine = 0; //edge-sensitive
|
|
irq(0, 0x0066, 0xff);
|
|
}
|
|
|
|
if(state.intLine) {
|
|
//level-sensitive
|
|
irq(1, 0x0038, 0xff);
|
|
}
|
|
|
|
instruction();
|
|
}
|
|
|
|
auto APU::step(uint clocks) -> void {
|
|
Thread::step(clocks);
|
|
synchronize(cpu);
|
|
}
|
|
|
|
auto APU::synchronizing() const -> bool {
|
|
return scheduler.synchronizing();
|
|
}
|
|
|
|
auto APU::setNMI(bool value) -> void {
|
|
state.nmiLine = value;
|
|
}
|
|
|
|
auto APU::setINT(bool value) -> void {
|
|
state.intLine = value;
|
|
}
|
|
|
|
auto APU::enable(bool value) -> void {
|
|
//68K cannot disable the Z80 without bus access
|
|
if(!bus->granted() && !value) return;
|
|
if(state.enabled && !value) reset();
|
|
state.enabled = value;
|
|
}
|
|
|
|
auto APU::power(bool reset) -> void {
|
|
Z80::bus = this;
|
|
Z80::power();
|
|
bus->grant(false);
|
|
create(APU::Enter, system.frequency() / 15.0);
|
|
|
|
if(!reset) memory::fill(ram, sizeof ram);
|
|
state = {};
|
|
}
|
|
|
|
auto APU::reset() -> void {
|
|
Z80::power();
|
|
bus->grant(false);
|
|
create(APU::Enter, system.frequency() / 15.0);
|
|
state = {};
|
|
}
|
|
|
|
}
|