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https://github.com/libretro/MesenCE.git
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Adrian "asie" SiekierkaandSour
22424d7412
* GBA: Separate S3511A RTC emulation code from GBA interface emulation code. * WS: Initial cartridge RTC implementation. * WS: Expose cartridge RTC state to register viewer. * Code: Fix formatting. * WS: Update Core.vcxproj. * Fix compilation error, remove unused method --------- Co-authored-by: Sour <[email protected]>
102 lines
2.0 KiB
C++
102 lines
2.0 KiB
C++
#include "pch.h"
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#include "WS/WsConsole.h"
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#include "WS/Carts/WsRtc.h"
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#include "Utilities/Serializer.h"
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#include "Shared/Utilities/S3511ARtc.h"
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// TODOWS clock-accurate behavior, needs tests
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// TODOWS edge case: changing commands mid-transfer, needs tests
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WsRtc::WsRtc(Emulator* emu, WsConsole* console) : S3511ARtc(emu), _console(console)
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{
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_state.Ready = true;
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}
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bool WsRtc::IsCommandRead()
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{
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return (_state.Command & 0x01) != 0;
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}
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void WsRtc::StartByteTransfer()
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{
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if(_state.Busy) {
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_state.Ready = false;
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_transferClock = _console->GetCartridgeClock() + 8;
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}
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}
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void WsRtc::Update()
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{
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if(!_state.Ready && _console->GetCartridgeClock() >= _transferClock) {
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if(!_commandTransferred) {
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WriteBits((_state.Command & 0x0F) | 0x60, 8);
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_commandTransferred = true;
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_state.Ready = true;
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if(_bytesLeft) {
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StartByteTransfer();
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}
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} else if(_bytesLeft) {
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if(IsCommandRead()) {
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_state.Data = ReadBits(8);
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} else {
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WriteBits(_state.Data, 8);
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}
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_state.Ready = true;
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_bytesLeft--;
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}
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if(_commandTransferred && !_bytesLeft) {
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ResetBus();
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_state.Busy = false;
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_commandTransferred = false;
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}
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}
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}
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uint8_t WsRtc::ReadPort(uint16_t port)
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{
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Update();
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if(port == 0xCA) {
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return (_state.Command & 0x0F) | (_state.Busy ? 0x10 : 0) | (_state.Ready ? 0x80 : 0);
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} else if(port == 0xCB) {
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if(_bytesLeft && IsCommandRead()) {
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StartByteTransfer();
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}
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return _state.Data;
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}
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return 0;
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}
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void WsRtc::WritePort(uint16_t port, uint8_t value)
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{
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Update();
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if(port == 0xCA) {
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_state.Busy = (value & 0x10) == 0x10;
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_state.Command = (value & 0x0F);
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_bytesLeft = GetCommandLength(_state.Command);
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StartByteTransfer();
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} else if(port == 0xCB) {
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_state.Data = value;
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if(_bytesLeft && !IsCommandRead()) {
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StartByteTransfer();
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}
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}
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}
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void WsRtc::Serialize(Serializer& s)
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{
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S3511ARtc::Serialize(s);
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SV(_state.Command);
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SV(_state.Data);
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SV(_state.Ready);
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SV(_state.Busy);
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SV(_bytesLeft);
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SV(_commandTransferred);
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SV(_transferClock);
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}
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