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◆ main openmsx / src / fdc / TC8566AF.hh
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#ifndef TC8566AF_HH
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#define TC8566AF_HH
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#include "DynamicClock.hh"
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#include "EmuTime.hh"
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#include "Schedulable.hh"
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#include "serialize_meta.hh"
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#include "CRC16.hh"
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#include <array>
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#include <cstdint>
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#include <span>
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namespace openmsx {
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class Scheduler;
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class DiskDrive;
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class MSXCliComm;
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class TC8566AF final : public Schedulable
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{
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public:
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	TC8566AF(Scheduler& scheduler, std::span<std::unique_ptr<DiskDrive>, 4>, MSXCliComm& cliComm,
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	         EmuTime time);
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	void reset(EmuTime time);
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	[[nodiscard]] uint8_t peekDataPort(EmuTime time) const;
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	uint8_t readDataPort(EmuTime time);
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	[[nodiscard]] uint8_t peekStatus() const;
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	uint8_t readStatus(EmuTime time);
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	void writeControlReg0(uint8_t value, EmuTime time);
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	void writeControlReg1(uint8_t value, EmuTime time);
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	void writeDataPort(uint8_t value, EmuTime time);
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	bool diskChanged(unsigned driveNum);
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	[[nodiscard]] bool peekDiskChanged(unsigned driveNum) const;
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	template<typename Archive>
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	void serialize(Archive& ar, unsigned version);
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	// public for serialization
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	enum class Command : uint8_t {
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		UNKNOWN,
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		READ_DATA,
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		WRITE_DATA,
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		WRITE_DELETED_DATA,
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		READ_DELETED_DATA,
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		READ_DIAGNOSTIC,
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		READ_ID,
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		FORMAT,
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		SCAN_EQUAL,
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		SCAN_LOW_OR_EQUAL,
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		SCAN_HIGH_OR_EQUAL,
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		SEEK,
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		RECALIBRATE,
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		SENSE_INTERRUPT_STATUS,
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		SPECIFY,
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		SENSE_DEVICE_STATUS,
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	};
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	enum class Phase : uint8_t {
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		IDLE,
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		COMMAND,
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		DATA_TRANSFER,
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		RESULT,
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	};
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	enum class Seek : uint8_t {
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		IDLE,
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		SEEK,
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		RECALIBRATE
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	};
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private:
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	// Schedulable
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	void executeUntil(EmuTime time) override;
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	[[nodiscard]] uint8_t executionPhasePeek(EmuTime time) const;
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	uint8_t executionPhaseRead(EmuTime time);
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	[[nodiscard]] uint8_t resultsPhasePeek() const;
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	uint8_t resultsPhaseRead(EmuTime time);
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	void idlePhaseWrite(uint8_t value, EmuTime time);
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	void commandPhase1(uint8_t value);
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	void commandPhaseWrite(uint8_t value, EmuTime time);
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	void doSeek(int n);
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	void executionPhaseWrite(uint8_t value, EmuTime time);
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	void resultPhase(bool readId = false);
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	void endCommand(EmuTime time);
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	[[nodiscard]] bool isHeadLoaded(EmuTime time) const;
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	[[nodiscard]] EmuDuration getHeadLoadDelay() const;
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	[[nodiscard]] EmuDuration getHeadUnloadDelay() const;
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	[[nodiscard]] EmuDuration getSeekDelay() const;
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	[[nodiscard]] EmuTime locateSector(EmuTime time, bool readId);
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	void startReadWriteSector(EmuTime time);
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	void writeSector();
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	void initTrackHeader(EmuTime time);
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	void formatSector();
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	void setDrqRate(unsigned trackLength);
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private:
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	MSXCliComm& cliComm;
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	std::array<DiskDrive*, 4> drive;
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	DynamicClock delayTime{EmuTime::zero()};
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	// Before this time head is loaded, after this time it's unloaded. Set
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	// to zero/infinity to force a (un)loaded head.
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	EmuTime headUnloadTime = EmuTime::zero(); // head not loaded
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	Command command;
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	Phase phase;
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	int phaseStep;
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	//bool interrupt;
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	unsigned dataAvailable = 0; // avoid UMR (on savestate)
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	int dataCurrent = 0;
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	CRC16 crc;
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	uint8_t driveSelect;
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	uint8_t mainStatus;
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	uint8_t status0;
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	uint8_t status1;
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	uint8_t status2;
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	uint8_t status3;
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	uint8_t commandCode;
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	uint8_t cylinderNumber;
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	uint8_t headNumber;
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	uint8_t sectorNumber;
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	uint8_t number;
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	uint8_t endOfTrack;
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	uint8_t sectorsPerCylinder;
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	uint8_t fillerByte;
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	uint8_t gapLength;
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	std::array<uint8_t, 2> specifyData; // filled in by SPECIFY command
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	struct SeekInfo {
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		EmuTime time = EmuTime::zero();
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		uint8_t currentTrack = 0;
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		uint8_t seekValue = 0;
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		Seek state = Seek::IDLE;
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		template<typename Archive>
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		void serialize(Archive& ar, unsigned version);
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	};
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	std::array<SeekInfo, 4> seekInfo;
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};
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SERIALIZE_CLASS_VERSION(TC8566AF, 7);
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} // namespace openmsx
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#endif