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Annotation of nono/vm/adpcm.h, revision 1.1.1.4

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: 
1.1.1.2   root       16: class DMACDevice;
                     17: class PPIDevice;
                     18: 
1.1       root       19: class ADPCMDevice : public IODevice
                     20: {
                     21:        using inherited = IODevice;
                     22: 
1.1.1.4 ! root       23:        static const uint32 baseaddr = 0xe92000;
1.1       root       24: 
                     25:        static const uint8 STAT_PLAY    = 0x80;
                     26: 
                     27:        static const uint8 REC_START    = 0x04;
                     28:        static const uint8 PLAY_START   = 0x02;
                     29:        static const uint8 STOP                 = 0x01;
                     30: 
                     31:  public:
                     32:        ADPCMDevice();
1.1.1.3   root       33:        ~ADPCMDevice() override;
1.1       root       34: 
1.1.1.2   root       35:        bool Init() override;
1.1       root       36:        void ResetHard(bool poweron) override;
                     37: 
                     38:        // CT1 によるクロック切り替え。OPM から呼ばれる。
                     39:        void SetClock(bool);
                     40: 
                     41:        // DMAC から呼ばれる。
                     42:        void AssertDACK(bool tc);
                     43:        void NegateDACK();
                     44: 
                     45:  protected:
                     46:        // BusIO インタフェース
                     47:        static const uint32 NPORT = 2;
1.1.1.4 ! root       48:        busdata ReadPort(uint32 offset);
        !            49:        busdata WritePort(uint32 offset, uint32 data);
        !            50:        busdata PeekPort(uint32 offset);
        !            51:        bool PokePort(uint32 offset, uint32 data);
1.1       root       52: 
                     53:  private:
                     54:        void StartPlay();
                     55: 
                     56:        void EventCallback(Event&);
                     57: 
                     58:        bool playing {};
                     59:        bool dack {};
                     60:        int clk {};
                     61:        int div {};
                     62: 
1.1.1.2   root       63:        DMACDevice *dmac {};
                     64:        PPIDevice *ppi {};
                     65: 
1.1       root       66:        Event event { this };
                     67: };
                     68: 
1.1.1.2   root       69: static inline ADPCMDevice *GetADPCMDevice() {
                     70:        return Object::GetObject<ADPCMDevice>(OBJ_ADPCM);
                     71: }

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