I8255.hh

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// 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 "openmsx.hh"

namespace openmsx {

class I8255Interface;
class CliComm;

class I8255
{
public:
        I8255(I8255Interface& interf, EmuTime::param time,
              CliComm& cliComm);

        void reset(EmuTime::param time);

        byte read(byte port, EmuTime::param time);
        byte peek(byte port, EmuTime::param time) const;
        void write(byte port, byte value, EmuTime::param time);

        template<typename Archive>
        void serialize(Archive& ar, unsigned version);

private:
        byte readPortA(EmuTime::param time);
        byte readPortB(EmuTime::param time);
        byte readPortC(EmuTime::param time);
        byte readControlPort(EmuTime::param time) const;
        byte peekPortA(EmuTime::param time) const;
        byte peekPortB(EmuTime::param time) const;
        byte peekPortC(EmuTime::param time) const;
        void writePortA(byte value, EmuTime::param time);
        void writePortB(byte value, EmuTime::param time);
        void writePortC(byte value, EmuTime::param time);
        void writeControlPort(byte value, EmuTime::param time);

        byte readC0(EmuTime::param time);
        byte readC1(EmuTime::param time);
        byte peekC0(EmuTime::param time) const;
        byte peekC1(EmuTime::param time) const;
        void outputPortA(byte value, EmuTime::param time);
        void outputPortB(byte value, EmuTime::param time);
        void outputPortC(byte value, EmuTime::param time);

        I8255Interface& interface;
        CliComm& cliComm;

        byte control;
        byte latchPortA;
        byte latchPortB;
        byte latchPortC;

        bool warningPrinted;
};

} // namespace openmsx

#endif