pingpongdma.h

EP931X系列的WinCE声卡驱动源代码

//**********************************************************************
//                                                                      
// Filename: pingpongdma.h
//                                                                      
// Description: Ping Pong DMA class
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Use of this source code is subject to the terms of the Cirrus end-user
// license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.
// If you did not accept the terms of the EULA, you are not authorized to 
// use this source code. For a copy of the EULA, please see the 
// EULA.RTF on your install media.
//
// Copyright(c) Cirrus Logic Corporation 2003, All Rights Reserved                       
//                                                                      
//**********************************************************************
#ifndef _H_DMA_DRIVER
#define _H_DMA_DRIVER

typedef  void DMA_PINGPONG_CALLBACK(HANDLE, BOOL);       

class PingPongDma
{
    public:
        PingPongDma(void);
        ~PingPongDma(void);


        MMRESULT    Initialize
        (
            volatile ULONG *pulDmaChannel, 
            ULONG           ulPeripheral,
            ULONG           ulBufferSize
        );

        MMRESULT            Start(void);
        MMRESULT            Stop(void);
        MMRESULT            Pause(void);
        void                Flush(void);
        ULONG               CurrentPosition(void);
        ULONG               GetPhysBuffAddress(void)        {return m_ulPhysBuff;}
        void *              GetVirtBuffAddress(void)        {return m_pBuffer;}
        void                SetCallBack(DMA_PINGPONG_CALLBACK *pfn, HANDLE m_hCallBackHandle);
        BOOL                IsDmaOn(void)                   {return m_bPlaying;}

    private:

        static  DWORD WINAPI IST(LPVOID lpParam);
        CRITICAL_SECTION    m_Critsec;
        void    *           m_pBuffer;
        ULONG               m_ulPhysBuff;
        //int                 m_ulChannel;
        ULONG               m_ulBufferSize;
        volatile ULONG *    m_pulDma;
        ULONG               m_ulPeriph;
        ULONG               m_ulCurrentPos;
        ULONG               m_ulSysIntr;
        BOOL                m_bPlaying;
        BOOL                m_bExitThread;
        HANDLE              m_hEvent;
        HANDLE              m_hThread;
        DMA_PINGPONG_CALLBACK  *     m_pfnCallBack;      
        HANDLE              m_hCallBackHandle;
        BOOL                m_bOrder;
};


#define     NUM_DMA_CHANNELS        10




#endif // _H_DMA_DRIVER