MSXMidi.hh

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#ifndef MSXMIDI_HH
#define MSXMIDI_HH
 
#include "MSXDevice.hh"
#include "IRQHelper.hh"
#include "MidiInConnector.hh"
#include "MidiOutConnector.hh"
#include "I8251.hh"
#include "I8254.hh"
 
namespace openmsx {
 
class MSXMidi final : public MSXDevice, public MidiInConnector
{
public:
        explicit MSXMidi(const DeviceConfig& config);
        ~MSXMidi() override;
 
        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;
 
        // MidiInConnector
        [[nodiscard]] bool ready() override;
        [[nodiscard]] bool acceptsData() override;
        void setDataBits(DataBits bits) override;
        void setStopBits(StopBits bits) override;
        void setParityBit(bool enable, Parity parity) override;
        void recvByte(byte value, EmuTime::param time) override;
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
private:
        void setTimerIRQ(bool status, EmuTime::param time);
        void enableTimerIRQ(bool enabled, EmuTime::param time);
        void updateEdgeEvents(EmuTime::param time);
        void setRxRDYIRQ(bool status);
        void enableRxRDYIRQ(bool enabled);
 
        void registerIOports(byte value);
 
private:
        struct Counter0 final : ClockPinListener {
                void signal(ClockPin& pin, EmuTime::param time) override;
                void signalPosEdge(ClockPin& pin, EmuTime::param time) override;
        } cntr0; // counter 0 clock pin
 
        struct Counter2 final : ClockPinListener {
                void signal(ClockPin& pin, EmuTime::param time) override;
                void signalPosEdge(ClockPin& pin, EmuTime::param time) override;
        } cntr2; // counter 2 clock pin
 
        struct Interface final : I8251Interface {
                void setRxRDY(bool status, EmuTime::param time) override;
                void setDTR(bool status, EmuTime::param time) override;
                void setRTS(bool status, EmuTime::param time) override;
                [[nodiscard]] bool getDSR(EmuTime::param time) override;
                [[nodiscard]] bool getCTS(EmuTime::param time) override;
                void setDataBits(DataBits bits) override;
                void setStopBits(StopBits bits) override;
                void setParityBit(bool enable, Parity parity) override;
                void recvByte(byte value, EmuTime::param time) override;
                void signal(EmuTime::param time) override;
        } interface;
 
        IRQHelper timerIRQ;
        IRQHelper rxrdyIRQ;
        bool timerIRQlatch = false;
        bool timerIRQenabled = false;
        bool rxrdyIRQlatch = false;
        bool rxrdyIRQenabled = false;
 
        const bool isExternalMSXMIDI;
        bool isEnabled; /* EN bit */
        bool isLimitedTo8251 = true; /* inverse of E8 bit */
 
        // must come last
        MidiOutConnector outConnector;
        I8251 i8251;
        I8254 i8254;
};
SERIALIZE_CLASS_VERSION(MSXMidi, 2);
 
} // namespace openmsx
 
#endif