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Annotation of nono/vm/adpcm.h, revision 1.1.1.5

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: 
1.1.1.2   root       15: class DMACDevice;
                     16: class PPIDevice;
                     17: 
1.1       root       18: class ADPCMDevice : public IODevice
                     19: {
                     20:        using inherited = IODevice;
                     21: 
1.1.1.4   root       22:        static const uint32 baseaddr = 0xe92000;
1.1       root       23: 
                     24:        static const uint8 STAT_PLAY    = 0x80;
                     25: 
                     26:        static const uint8 REC_START    = 0x04;
                     27:        static const uint8 PLAY_START   = 0x02;
                     28:        static const uint8 STOP                 = 0x01;
                     29: 
                     30:  public:
                     31:        ADPCMDevice();
1.1.1.3   root       32:        ~ADPCMDevice() override;
1.1       root       33: 
1.1.1.2   root       34:        bool Init() override;
1.1       root       35:        void ResetHard(bool poweron) override;
                     36: 
                     37:        // CT1 によるクロック切り替え。OPM から呼ばれる。
                     38:        void SetClock(bool);
                     39: 
                     40:        // DMAC から呼ばれる。
                     41:        void AssertDACK(bool tc);
                     42:        void NegateDACK();
                     43: 
                     44:  protected:
                     45:        // BusIO インタフェース
                     46:        static const uint32 NPORT = 2;
1.1.1.4   root       47:        busdata ReadPort(uint32 offset);
                     48:        busdata WritePort(uint32 offset, uint32 data);
                     49:        busdata PeekPort(uint32 offset);
                     50:        bool PokePort(uint32 offset, uint32 data);
1.1       root       51: 
                     52:  private:
                     53:        void StartPlay();
                     54: 
1.1.1.5 ! root       55:        void EventCallback(Event *);
1.1       root       56: 
                     57:        bool playing {};
                     58:        bool dack {};
                     59:        int clk {};
                     60:        int div {};
                     61: 
1.1.1.2   root       62:        DMACDevice *dmac {};
                     63:        PPIDevice *ppi {};
                     64: 
1.1.1.5 ! root       65:        Event *event {};
1.1       root       66: };
                     67: 
1.1.1.2   root       68: static inline ADPCMDevice *GetADPCMDevice() {
                     69:        return Object::GetObject<ADPCMDevice>(OBJ_ADPCM);
                     70: }

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