mirror of
https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
81 lines
No EOL
2 KiB
C++
81 lines
No EOL
2 KiB
C++
#pragma once
|
|
#include "pch.h"
|
|
#include "NES/BaseMapper.h"
|
|
#include "NES/NesConsole.h"
|
|
#include "NES/NesCpu.h"
|
|
|
|
class IremH3001 : public BaseMapper
|
|
{
|
|
private:
|
|
bool _irqEnabled = false;
|
|
uint16_t _irqCounter = 0;
|
|
uint16_t _irqReloadValue = 0;
|
|
|
|
protected:
|
|
uint16_t GetPrgPageSize() override { return 0x2000; }
|
|
uint16_t GetChrPageSize() override { return 0x400; }
|
|
bool EnableCpuClockHook() override { return true; }
|
|
|
|
void InitMapper() override
|
|
{
|
|
SelectPrgPage(0, 0);
|
|
SelectPrgPage(1, 1);
|
|
SelectPrgPage(2, 0xFE);
|
|
SelectPrgPage(3, -1);
|
|
}
|
|
|
|
void Serialize(Serializer& s) override
|
|
{
|
|
BaseMapper::Serialize(s);
|
|
SV(_irqEnabled);
|
|
SV(_irqCounter);
|
|
SV(_irqReloadValue);
|
|
}
|
|
|
|
void ProcessCpuClock() override
|
|
{
|
|
BaseProcessCpuClock();
|
|
|
|
if(_irqEnabled) {
|
|
_irqCounter--;
|
|
if(_irqCounter == 0) {
|
|
_irqEnabled = false;
|
|
_console->GetCpu()->SetIrqSource(IRQSource::External);
|
|
}
|
|
}
|
|
}
|
|
|
|
void WriteRegister(uint16_t addr, uint8_t value) override
|
|
{
|
|
switch(addr) {
|
|
case 0x8000: SelectPrgPage(0, value); break;
|
|
|
|
case 0x9001: SetMirroringType(value & 0x80 ? MirroringType::Horizontal : MirroringType::Vertical); break;
|
|
case 0x9003:
|
|
_irqEnabled = (value & 0x80) == 0x80;
|
|
_console->GetCpu()->ClearIrqSource(IRQSource::External);
|
|
break;
|
|
|
|
case 0x9004:
|
|
_irqCounter = _irqReloadValue;
|
|
_console->GetCpu()->ClearIrqSource(IRQSource::External);
|
|
break;
|
|
|
|
case 0x9005: _irqReloadValue = (_irqReloadValue & 0x00FF) | (value << 8); break;
|
|
case 0x9006: _irqReloadValue = (_irqReloadValue & 0xFF00) | value; break;
|
|
|
|
case 0xA000: SelectPrgPage(1, value); break;
|
|
|
|
case 0xB000: SelectChrPage(0, value); break;
|
|
case 0xB001: SelectChrPage(1, value); break;
|
|
case 0xB002: SelectChrPage(2, value); break;
|
|
case 0xB003: SelectChrPage(3, value); break;
|
|
case 0xB004: SelectChrPage(4, value); break;
|
|
case 0xB005: SelectChrPage(5, value); break;
|
|
case 0xB006: SelectChrPage(6, value); break;
|
|
case 0xB007: SelectChrPage(7, value); break;
|
|
|
|
case 0xC000: SelectPrgPage(2, value); break;
|
|
}
|
|
}
|
|
}; |