// This class implements the Intel 8255 chip

//

// * Only the 8255 is emulated, no surrounding hardware.

//   Use the class I8255Interface to do that.

// * Only mode 0 (basic input/output) is implemented

#ifndef I8255_HH

#define I8255_HH

#include "EmuTime.hh"

#include "TclCallback.hh"

#include <cstdint>

namespace openmsx {

class I8255Interface;

class StringSetting;

class I8255

{

public:

	I8255(I8255Interface& interface, EmuTime time,

	      StringSetting& invalidPpiModeSetting);

	// CPU side

	void reset(EmuTime time);

	[[nodiscard]] uint8_t read(uint8_t port, EmuTime time);

	[[nodiscard]] uint8_t peek(uint8_t port, EmuTime time) const;

	void write(uint8_t port, uint8_t value, EmuTime time);

	// Peripheral side, pull-interface

	// (the I8255Interface class implements the push-interface)

	uint8_t getPortA() const;

	uint8_t getPortB() const;

	uint8_t getPortC() const;

	template<typename Archive>

	void serialize(Archive& ar, unsigned version);

private:

	[[nodiscard]] uint8_t readPortA(EmuTime time);

	[[nodiscard]] uint8_t readPortB(EmuTime time);

	[[nodiscard]] uint8_t readPortC(EmuTime time);

	[[nodiscard]] uint8_t readControlPort(EmuTime time) const;

	[[nodiscard]] uint8_t peekPortA(EmuTime time) const;

	[[nodiscard]] uint8_t peekPortB(EmuTime time) const;

	[[nodiscard]] uint8_t peekPortC(EmuTime time) const;

	void writePortA(uint8_t value, EmuTime time);

	void writePortB(uint8_t value, EmuTime time);

	void writePortC(uint8_t value, EmuTime time);

	void writeControlPort(uint8_t value, EmuTime time);

	[[nodiscard]] uint8_t readC0(EmuTime time);

	[[nodiscard]] uint8_t readC1(EmuTime time);

	[[nodiscard]] uint8_t peekC0(EmuTime time) const;

	[[nodiscard]] uint8_t peekC1(EmuTime time) const;

	void outputPortA(uint8_t value, EmuTime time);

	void outputPortB(uint8_t value, EmuTime time);

	void outputPortC(uint8_t value, EmuTime time);

private:

	I8255Interface& interface;

	uint8_t control;

	uint8_t latchPortA;

	uint8_t latchPortB;

	uint8_t latchPortC;

	TclCallback ppiModeCallback;

};

} // namespace openmsx

#endif