mirror of
https://github.com/NovaSquirrel/Mesen-X.git
synced 2024-05-31 18:38:15 -04:00
283 lines
7 KiB
C++
283 lines
7 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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#include "MemoryManager.h"
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#include "VirtualFile.h"
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#include "../Utilities/FolderUtilities.h"
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#include "../Utilities/HexUtilities.h"
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class StudyBox : public BaseMapper
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{
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private:
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bool _readyForBit = false;
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uint16_t _processBitDelay = 0;
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uint8_t _reg4202 = 0;
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uint8_t _commandCounter = 0;
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uint8_t _command = 0;
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uint8_t _currentPage = 0;
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int16_t _seekPage = 0;
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uint32_t _seekPageDelay = 0;
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bool _enableDecoder = false;
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bool _motorDisabled = false;
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uint16_t _byteReadDelay = 0;
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bool _irqEnabled = false;
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bool _pageFound = false;
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vector<uint8_t> _pageData;
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int32_t _pagePosition = -1;
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uint32_t _inDataDelay = 0;
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bool _inDataRegion = false;
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protected:
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uint16_t RegisterStartAddress() override { return 0x4200; }
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uint16_t RegisterEndAddress() override { return 0x4203; }
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bool AllowRegisterRead() override { return true; }
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uint16_t GetPRGPageSize() override { return 0x4000; }
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uint16_t GetCHRPageSize() override { return 0x2000; }
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uint32_t GetWorkRamSize() override { return 0x10000; }
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uint32_t GetWorkRamPageSize() override { return 0x1000; }
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void InitMapper() override
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{
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SelectPRGPage(1, 0);
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SelectCHRPage(0, 0);
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//First bank is mapped to 4000-4FFF, but the first 1kb is not accessible
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SetCpuMemoryMapping(0x4000, 0x4FFF, 8, PrgMemoryType::WorkRam);
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RemoveCpuMemoryMapping(0x4000, 0x43FF);
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SetMirroringType(MirroringType::FourScreens);
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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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}
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void ProcessCpuClock() override
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{
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if(_processBitDelay > 0) {
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_processBitDelay--;
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if(_processBitDelay == 0) {
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_readyForBit = true;
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}
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}
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if(_seekPage != 0) {
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_seekPageDelay--;
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if(_seekPageDelay == 0) {
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_seekPageDelay = 3000000;
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_pageFound = true;
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if(_seekPage > 0) {
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_currentPage++;
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_seekPage--;
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} else {
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_currentPage--;
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_seekPage++;
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}
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VirtualFile file(FolderUtilities::CombinePath("StudyBox", "Page" + std::to_string(_currentPage) + ".bin"));
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file.ReadFile(_pageData);
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_inDataDelay = 300000;
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_pagePosition = -1;
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_byteReadDelay = 0;
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}
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}
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if(_inDataDelay > 0) {
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_inDataRegion = true;
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_inDataDelay--;
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if(_inDataDelay == 0) {
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_byteReadDelay = 7820;
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_console->GetCpu()->SetIrqSource(IRQSource::External);
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}
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}
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if(!_motorDisabled && _byteReadDelay > 0) {
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_byteReadDelay--;
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if(_byteReadDelay == 0) {
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_byteReadDelay = 3355;
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_pagePosition++;
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if(_pagePosition >= (int32_t)_pageData.size()) {
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_pageFound = false;
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_inDataRegion = false;
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//_motorDisabled = true;
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}
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if(_irqEnabled) {
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_console->GetCpu()->SetIrqSource(IRQSource::External);
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}
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}
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}
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}
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uint8_t ReadRegister(uint16_t addr) override
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{
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switch(addr) {
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case 0x4200: {
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if(!_enableDecoder) {
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MessageManager::Log("Error - read 4200 without decoder being enabled");
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}
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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if(_pagePosition >= 0 && _pagePosition < (int32_t)_pageData.size()) {
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//MessageManager::Log("Read: " + HexUtilities::ToHex(_pageData[_pagePosition]));
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return _pageData[_pagePosition];
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}
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return 0;
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}
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case 0x4201: {
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/* Tape read status ?
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$80 - something to do with $4202.0 ? decoder disabled ? | decoder data ready ?
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$40 - tape data clock synched ? current tape data bit ? | current tape flux polarity ? tape motor running ? | seek complete ?
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$20 - set when in data region during seek ? possibly set when in data region generally ? or set normally and cleared when in a data region ?
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$10 - ? ? ? */
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uint8_t value = (
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//0x10 |
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(_inDataRegion ? 0x20 : 0) |
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(_pageFound ? 0x40 : 0) |
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(_enableDecoder ? 0x80 : 0)
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);
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_pageFound = false;
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return value;
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}
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case 0x4202:
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//Tape drive status?
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//$40 - shift register ready for next bit?
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//$08 - power supply not connected
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return (
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//(_powerDisconnected ? 0x08 : 0) |
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(_readyForBit ? 0x40 : 0)
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);
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case 0x4203:
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//unused?
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return 0x00;
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}
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return 0;
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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) {
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case 0x4200:
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SetCpuMemoryMapping(0x6000, 0x6FFF, (value & 0xC0) >> 5, PrgMemoryType::WorkRam);
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SetCpuMemoryMapping(0x7000, 0x7FFF, ((value & 0xC0) >> 5) + 1, PrgMemoryType::WorkRam);
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SetCpuMemoryMapping(0x5000, 0x5FFF, (value & 0x07) + 8, PrgMemoryType::WorkRam);
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break;
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case 0x4201:
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//PRG Select
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SelectPRGPage(0, value);
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break;
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case 0x4202:
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/*Tape drive control
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$80 - output data bit
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$40 - ???
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$20 - pulse low to reset drive controller?
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$10 - pulse low to clock data bit
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$08 - ???
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$04 - ??? maybe tape audio enable?
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$02 - irq enable?
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$01 - data decoding enable?
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*/
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if((_reg4202 & 0x10) && !(value & 0x10)) {
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if(!_readyForBit) {
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MessageManager::Log("Error - write without being ready");
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}
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//Clock command bit
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_command <<= 1;
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_command |= (value & 0x80) >> 7;
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_commandCounter++;
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if(_commandCounter == 8) {
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_commandCounter = 0;
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MessageManager::Log("Command sent: " + std::to_string(_command));
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if(_command >= 1 && _command < 0x40) {
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_seekPage = _command;
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_seekPageDelay = 3000000;
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_motorDisabled = false;
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} else if(_command > 0x40 && _command < 0x80) {
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_seekPage = -(_command - 0x40);
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_seekPageDelay = 3000000;
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_motorDisabled = false;
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} else if(_command == 0) {
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_seekPage = -1;
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_seekPageDelay = 3000000;
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_motorDisabled = false;
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} else if(_command == 0x86) {
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while(_pagePosition < (int32_t)_pageData.size() && _pageData[_pagePosition] != 0xC5) {
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_pagePosition++;
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}
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_pagePosition--;
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_inDataDelay = 300000;
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_motorDisabled = false;
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_byteReadDelay = 0;
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_pageFound = true;
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}
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/*} else if(_command == 0xFF) {
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//???
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}*/
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}
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}
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if(value & 0x10) {
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_readyForBit = false;
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_processBitDelay = 100;
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}
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if((_reg4202 & 0x6E) != (value & 0x6E)) {
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MessageManager::Log("Reg 4202 value changed: " + HexUtilities::ToHex(_reg4202) + " -> " + HexUtilities::ToHex(value));
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}
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if((_reg4202 & 0x20) && !(value & 0x20)) {
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//Reset drive
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_command = 0;
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_commandCounter = 0;
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_readyForBit = true;
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}
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if((value & 0x04) != (_reg4202 & 0x04)) {
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MessageManager::Log((value & 0x04) ? "Audio disabled" : "Audio enabled");
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}
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if((value & 0x02) != (_reg4202 & 0x02)) {
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MessageManager::Log((value & 0x02) ? "IRQ enabled" : "IRQ disabled");
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}
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/*if((value & 0x01) != (_reg4202 & 0x01)) {
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MessageManager::Log((value & 0x01) ? "Decoder enabled" : "Decoder disabled");
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}*/
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if(!(_reg4202 & 0x04) && (value & 0x04)) {
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_motorDisabled = true;
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}
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_reg4202 = value;
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_enableDecoder = value & 0x01;
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_irqEnabled = value & 0x02;
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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break;
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case 0x4203:
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//Unused?
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break;
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}
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}
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}; |