mirror of
https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
64126ace83
-IRQ/SCSI status should happen after seek is done when a play command is sent (fixes audio sync in Brandish intro cutscene) -Fixed seek delay not being applied correctly when swapping from audio playback to data loading and tweaked seek delays to make them a bit slower (fixes Brandish audio glitch during introduction) -Fixed regression that causes the "transfer ready" irq flag to not be reset when a sector was done reading (this broke the intro sequence in "It came from the desert") -Improved behavior when a load operation is cancelled (to match the expected results of both scsitest and verificator tests)
145 lines
3 KiB
C++
145 lines
3 KiB
C++
#pragma once
|
|
#include "pch.h"
|
|
#include "PCE/PceTypes.h"
|
|
#include "Utilities/ISerializable.h"
|
|
|
|
class Emulator;
|
|
class PceConsole;
|
|
class PceCdRom;
|
|
struct DiscInfo;
|
|
|
|
namespace ScsiSignal
|
|
{
|
|
enum ScsiSignal
|
|
{
|
|
Ack,
|
|
Atn, //Unused
|
|
Bsy, //Set when an operation is in progress
|
|
Cd, //Set when the current transfer contains commands/messages/status (cleared when actual data)
|
|
Io, //Set when drive is sending data to the software (cleared when receiving)
|
|
Msg, //Set when a message is being sent/received
|
|
Req, //Set when drive is waiting for the software to reply
|
|
Rst,
|
|
Sel,
|
|
};
|
|
}
|
|
|
|
enum class ScsiStatus
|
|
{
|
|
Good = 0x00,
|
|
};
|
|
|
|
enum class ScsiCommand
|
|
{
|
|
TestUnitReady = 0x00,
|
|
RequestSense = 0x03,
|
|
Read = 0x08,
|
|
AudioStartPos = 0xD8,
|
|
AudioEndPos = 0xD9,
|
|
Pause = 0xDA,
|
|
ReadSubCodeQ = 0xDD,
|
|
ReadToc = 0xDE
|
|
};
|
|
|
|
enum class ScsiUpdateType
|
|
{
|
|
SetCmdPhase,
|
|
SetReqSignal,
|
|
ClearReqSignal,
|
|
SetDataInPhase,
|
|
SetTransferDoneIrq,
|
|
SetGoodStatus
|
|
};
|
|
|
|
class PceScsiBus : public ISerializable
|
|
{
|
|
private:
|
|
constexpr static int ReadBytesPerSecond = 153600; //75 frames/sectors of 2048 bytes per second, like audio
|
|
|
|
Emulator* _emu = nullptr;
|
|
DiscInfo* _disc = nullptr;
|
|
PceConsole* _console = nullptr;
|
|
PceCdRom* _cdrom = nullptr;
|
|
|
|
PceScsiBusState _state = {};
|
|
bool _stateChanged = false;
|
|
|
|
int64_t _readSectorCounter = 0;
|
|
int32_t _ackClearCounter = 0;
|
|
int32_t _updateCounter = 0;
|
|
ScsiUpdateType _updateType = {};
|
|
bool _needExec = true;
|
|
|
|
vector<uint8_t> _cmdBuffer;
|
|
deque<uint8_t> _dataBuffer;
|
|
|
|
void SetSignals() {}
|
|
void ClearSignals() {}
|
|
|
|
template<typename T, typename... T2>
|
|
void SetSignals(T signal, T2... signals)
|
|
{
|
|
SetSignalValue(signal, true);
|
|
SetSignals(signals...);
|
|
}
|
|
|
|
template<typename T, typename... T2>
|
|
void ClearSignals(T signal, T2... signals)
|
|
{
|
|
SetSignalValue(signal, false);
|
|
ClearSignals(signals...);
|
|
}
|
|
|
|
void SetPhase(ScsiPhase phase);
|
|
|
|
void Reset();
|
|
|
|
void ProcessStatusPhase();
|
|
void ProcessMessageInPhase();
|
|
void QueueDriveUpdate(ScsiUpdateType action, uint32_t delay);
|
|
void ProcessDataInPhase();
|
|
|
|
uint8_t GetCommandSize(ScsiCommand cmd);
|
|
void ExecCommand(ScsiCommand cmd);
|
|
void LogCommand(string msg);
|
|
void ProcessCommandPhase();
|
|
|
|
int64_t GetSeekTime(uint32_t startLba, uint32_t targetLba);
|
|
uint64_t GetSectorLoadTime();
|
|
void CmdRead();
|
|
|
|
uint32_t GetAudioLbaPos();
|
|
void CmdAudioStartPos();
|
|
void CmdAudioEndPos();
|
|
void CmdPause();
|
|
void CmdTestReadyUnit();
|
|
void CmdReadSubCodeQ();
|
|
void CmdReadToc();
|
|
|
|
void ProcessDiscRead();
|
|
|
|
public:
|
|
PceScsiBus(Emulator* emu, PceConsole* console, PceCdRom* cdRom, DiscInfo& disc);
|
|
|
|
void SetStatusMessage(ScsiStatus status, uint8_t data, uint32_t length = 1);
|
|
|
|
PceScsiBusState& GetState() { return _state; }
|
|
|
|
uint8_t GetStatus();
|
|
bool IsDataBlockReady() { return _dataBuffer.size() > 0; }
|
|
|
|
void SetDataPort(uint8_t data);
|
|
uint8_t GetDataPort();
|
|
|
|
bool CheckSignal(::ScsiSignal::ScsiSignal signal);
|
|
void SetSignalValue(::ScsiSignal::ScsiSignal signal, bool val);
|
|
|
|
void SetAckWithAutoClear();
|
|
|
|
void UpdateState();
|
|
__noinline void Exec();
|
|
|
|
bool NeedExec() { return _needExec; }
|
|
|
|
void Serialize(Serializer& s) override;
|
|
};
|