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125 lines
2.9 KiB
C++
125 lines
2.9 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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#include "CPU.h"
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#include "Sunsoft5bAudio.h"
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class SunsoftFme7 : public BaseMapper
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{
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private:
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Sunsoft5bAudio _audio;
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uint8_t _command;
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uint8_t _workRamValue;
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bool _irqEnabled;
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bool _irqCounterEnabled;
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uint16_t _irqCounter;
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protected:
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virtual uint16_t GetPRGPageSize() override { return 0x2000; }
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virtual uint16_t GetCHRPageSize() override { return 0x400; }
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virtual uint32_t GetWorkRamSize() override { return 0x8000; }
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virtual uint32_t GetWorkRamPageSize() override { return 0x2000; }
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virtual uint32_t GetSaveRamSize() override { return 0x8000; }
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virtual uint32_t GetSaveRamPageSize() override { return 0x2000; }
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void InitMapper() override
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{
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_command = 0;
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_workRamValue = 0;
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_irqEnabled = false;
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_irqCounterEnabled = false;
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_irqCounter = 0;
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SelectPRGPage(3, -1);
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UpdateWorkRam();
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}
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void StreamState(bool saving) override
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{
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BaseMapper::StreamState(saving);
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SnapshotInfo audio{ &_audio };
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Stream(_command, _workRamValue, _irqEnabled, _irqCounterEnabled, _irqCounter, audio);
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if(!saving) {
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UpdateWorkRam();
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}
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}
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void ProcessCpuClock() override
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{
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if(_irqCounterEnabled) {
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_irqCounter--;
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if(_irqCounter == 0xFFFF) {
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if(_irqEnabled) {
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CPU::SetIRQSource(IRQSource::External);
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}
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}
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}
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_audio.Clock();
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}
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void UpdateWorkRam()
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{
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if(_workRamValue & 0x40) {
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MemoryAccessType accessType = (_workRamValue & 0x80) ? MemoryAccessType::ReadWrite : MemoryAccessType::NoAccess;
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SetCpuMemoryMapping(0x6000, 0x7FFF, _workRamValue & 0x3F, HasBattery() ? PrgMemoryType::SaveRam : PrgMemoryType::WorkRam, accessType);
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} else {
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SetCpuMemoryMapping(0x6000, 0x7FFF, _workRamValue & 0x3F, PrgMemoryType::PrgRom);
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}
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}
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void WriteRegister(uint16_t addr, uint8_t value) override
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{
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switch(addr & 0xE000) {
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case 0x8000:
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_command = value;
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break;
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case 0xA000:
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switch(_command) {
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case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
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SelectCHRPage(_command, value);
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break;
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case 8: {
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_workRamValue = value;
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UpdateWorkRam();
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break;
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}
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case 9: case 0xA: case 0xB:
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SelectPRGPage(_command - 9, value & 0x3F);
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break;
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case 0xC:
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switch(value & 0x03) {
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case 0: SetMirroringType(MirroringType::Vertical); break;
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case 1: SetMirroringType(MirroringType::Horizontal); break;
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case 2: SetMirroringType(MirroringType::ScreenAOnly); break;
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case 3: SetMirroringType(MirroringType::ScreenBOnly); break;
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}
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break;
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case 0xD:
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_irqEnabled = (value & 0x01) == 0x01;
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_irqCounterEnabled = (value & 0x80) == 0x80;
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CPU::ClearIRQSource(IRQSource::External);
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break;
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case 0xE:
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_irqCounter = _irqCounter & 0xFF00 | value;
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break;
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case 0xF:
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_irqCounter = _irqCounter & 0xFF | (value << 8);
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break;
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}
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break;
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case 0xC000:
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case 0xE000:
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_audio.WriteRegister(addr, value);
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break;
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}
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}
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}; |