mirror of https://github.com/bsnes-emu/bsnes.git
61 lines
1.1 KiB
C++
61 lines
1.1 KiB
C++
#include <ms/ms.hpp>
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namespace MasterSystem {
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CPU cpu;
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auto CPU::Enter() -> void {
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while(true) scheduler.synchronize(), cpu.main();
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}
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auto CPU::main() -> void {
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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 CPU::step(uint clocks) -> void {
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Thread::step(clocks);
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synchronize(vdp);
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synchronize(psg);
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for(auto peripheral : peripherals) synchronize(*peripheral);
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}
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//called once per frame
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auto CPU::pollPause() -> void {
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if(Model::MasterSystem()) {
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static bool pause = 0;
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bool state = platform->inputPoll(ID::Port::Hardware, ID::Device::MasterSystemControls, 1);
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if(!pause && state) setNMI(1);
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pause = state;
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}
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}
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auto CPU::setNMI(bool value) -> void {
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state.nmiLine = value;
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}
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auto CPU::setINT(bool value) -> void {
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state.intLine = value;
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}
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auto CPU::power() -> void {
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Z80::bus = &MasterSystem::bus;
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Z80::power();
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create(CPU::Enter, system.colorburst());
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r.pc = 0x0000; //reset vector address
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memory::fill(&state, sizeof(State));
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}
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}
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