SVIPPI.hh

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// This class implements the mapping of the PPI (8255) into the SVI machine.
 
#ifndef SVIPPI_HH
#define SVIPPI_HH
 
#include "MSXDevice.hh"
#include "I8255Interface.hh"
#include "I8255.hh"
#include "Keyboard.hh"
#include "KeyClick.hh"
#include <array>
 
namespace openmsx {
 
class CassettePortInterface;
class JoystickPortIf;
 
class SVIPPI final : public MSXDevice, public I8255Interface
{
public:
        explicit SVIPPI(const DeviceConfig& config);
 
        void reset(EmuTime::param time) override;
        [[nodiscard]] byte readIO(word port, EmuTime::param time) override;
        [[nodiscard]] byte peekIO(word port, EmuTime::param time) const override;
        void writeIO(word port, byte value, EmuTime::param time) override;
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
private:
        // I8255Interface
        [[nodiscard]] byte readA(EmuTime::param time) override;
        [[nodiscard]] byte readB(EmuTime::param time) override;
        [[nodiscard]] nibble readC0(EmuTime::param time) override;
        [[nodiscard]] nibble readC1(EmuTime::param time) override;
        [[nodiscard]] byte peekA(EmuTime::param time) const override;
        [[nodiscard]] byte peekB(EmuTime::param time) const override;
        [[nodiscard]] nibble peekC0(EmuTime::param time) const override;
        [[nodiscard]] nibble peekC1(EmuTime::param time) const override;
        void writeA(byte value, EmuTime::param time) override;
        void writeB(byte value, EmuTime::param time) override;
        void writeC0(nibble value, EmuTime::param time) override;
        void writeC1(nibble value, EmuTime::param time) override;
 
private:
        CassettePortInterface& cassettePort;
        I8255 i8255;
        KeyClick click;
        Keyboard keyboard;
        std::array<JoystickPortIf*, 2> ports;
        nibble prevBits = 15;
        nibble selectedRow = 0;
};
 
} // namespace openmsx
 
#endif