I8254.hh

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// This class implements the Intel 8254 chip (and 8253)
//
// * Only the 8254 is emulated, no surrounding hardware.
//   Use the class I8254Interface to do that.

#ifndef I8254_HH
#define I8254_HH

#include "EmuTime.hh"
#include "openmsx.hh"
#include "noncopyable.hh"
#include <memory>

namespace openmsx {

class Scheduler;
class Counter;
class ClockPin;
class ClockPinListener;

class I8254 : private noncopyable
{
public:
        I8254(Scheduler& scheduler, ClockPinListener* output0,
              ClockPinListener* output1, ClockPinListener* output2,
              EmuTime::param time);
        ~I8254();

        void reset(EmuTime::param time);
        byte readIO(word port, EmuTime::param time);
        byte peekIO(word port, EmuTime::param time) const;
        void writeIO(word port, byte value, EmuTime::param time);

        void setGate(unsigned counter, bool status, EmuTime::param time);
        ClockPin& getClockPin(unsigned cntr);
        ClockPin& getOutputPin(unsigned cntr);

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

private:
        void readBackHelper(byte value, unsigned cntr, EmuTime::param time);

        std::unique_ptr<Counter> counter[3];
};

} // namespace openmsx

#endif