1）dsp调用这两个函数： void DM81XX_EDMA3_setParams(int chId, int dmaQueue, unsigned int srcAddr,
                            unsigned int dstAddr, unsigned short edmaWidth,
                            unsigned short edmaHeight, short srcLineOffset,
                            short dstLineOffset) void DM81XX_EDMA3_triggerTransfer(int chId)   进行edma数据的copy；   dma拷贝内容如下：   dma拷贝： int OSA_dmaCopyFillRun(OSA_DmaChHndl *hndl, void *pPrm, int count, int copyFillType) { DMA_CopyFillPrm prm; Uint32 cmd; int status; if(hndl->chId < 0) return OSA_EFAIL; prm.chId = hndl->chId; prm.count = count; prm.copyFillType = copyFillType; prm.prm = pPrm; cmd = DMA_IOCTL_CMD_MAKE(prm.copyFillType); status = ioctl(gOSA_dmaCtrl.fd, cmd, &prm); return status; }
  int OSA_dmaCopy1D(OSA_DmaChHndl *hndl, OSA_DmaCopy1D *prm, int count ) { return OSA_dmaCopyFillRun(hndl, prm, count, DMA_CMD_COPY_1D); }
  int OSA_dmaInit() { char deviceName[20]; if(!gOSA_dmaCtrl.isInitDone) { sprintf(deviceName, "/dev/%s", DMA_DRV_NAME); gOSA_dmaCtrl.fd = open(deviceName, O_RDWR); if(gOSA_dmaCtrl.fd<0) return OSA_EFAIL; gOSA_dmaCtrl.isInitDone = TRUE; } return OSA_SOK; }
  int OSA_dmaOpen(OSA_DmaChHndl *hndl, int dmaMode, int maxTransfers) { DMA_OpenClosePrm prm; Uint32 cmd; int status; prm.chId = -1; prm.mode = dmaMode; prm.maxTransfers = maxTransfers; cmd = DMA_IOCTL_CMD_MAKE(DMA_CMD_CH_OPEN); status = ioctl(gOSA_dmaCtrl.fd, cmd, &prm); if(status==0) hndl->chId = prm.chId; else hndl->chId = -1; return status; } 调用：         OSA_DmaCopy1D copy1D;         copy1D.srcPhysAddr = (unsigned long)srcAddr;
        copy1D.dstPhysAddr = (unsigned long)dstAddr;         copy1D.size   = sizeToCopy;
        OSA_dmaCopy1D(&dmaHndl, ©1D, 1);