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