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Annotation of nono/vm/adpcm.h, revision 1.1

1.1     ! root        1: //
        !             2: // nono
        !             3: // Copyright (C) 2022 nono project
        !             4: // Licensed under nono-license.txt
        !             5: //
        !             6: 
        !             7: //
        !             8: // ADPCM (MSM6258V)
        !             9: //
        !            10: 
        !            11: #pragma once
        !            12: 
        !            13: #include "device.h"
        !            14: #include "event.h"
        !            15: 
        !            16: class ADPCMDevice : public IODevice
        !            17: {
        !            18:        using inherited = IODevice;
        !            19: 
        !            20:        static const int baseaddr = 0xe92000;
        !            21: 
        !            22:        static const uint8 STAT_PLAY    = 0x80;
        !            23: 
        !            24:        static const uint8 REC_START    = 0x04;
        !            25:        static const uint8 PLAY_START   = 0x02;
        !            26:        static const uint8 STOP                 = 0x01;
        !            27: 
        !            28:  public:
        !            29:        ADPCMDevice();
        !            30:        virtual ~ADPCMDevice() override;
        !            31: 
        !            32:        void ResetHard(bool poweron) override;
        !            33: 
        !            34:        // CT1 によるクロック切り替え。OPM から呼ばれる。
        !            35:        void SetClock(bool);
        !            36: 
        !            37:        // DMAC から呼ばれる。
        !            38:        void AssertDACK(bool tc);
        !            39:        void NegateDACK();
        !            40: 
        !            41:  protected:
        !            42:        // BusIO インタフェース
        !            43:        static const uint32 NPORT = 2;
        !            44:        uint64 Read(uint32 offset);
        !            45:        uint64 Write(uint32 offset, uint32 data);
        !            46:        uint64 Peek(uint32 offset);
        !            47: 
        !            48:  private:
        !            49:        void StartPlay();
        !            50: 
        !            51:        void EventCallback(Event&);
        !            52: 
        !            53:        bool playing {};
        !            54:        bool dack {};
        !            55:        int clk {};
        !            56:        int div {};
        !            57: 
        !            58:        Event event { this };
        !            59: };
        !            60: 
        !            61: extern ADPCMDevice *gADPCM;

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