关于EDMA3 PingPong传输的问题

Hi, Andy,

按照你的需求，如果需要从一个源缓冲区向两个地址传送数据，那么你还是需要设置两组参数并且确定每组参数的源和目标地址，传输长度，等等，你可以考虑通过chain或者self-chain的方式将这两个传输链接在一起。这里有一个例子供你参考。

/*
 * =============================================================================
 *   @func  edma_chain_example
 * 
 *   @arg
 *      NONE
 *
 *   @desc
 *      This is the example routine which perform edma interrupt.
 *      It implements following steps
 *          1. Intializes and Opens the Edma
 *          2. Sets up the edma module using the API csl_edma3Hwsetup ()
 *          4. Enables the edma region5 using CSL_EDMA3_CMD_DMAREGION_ENABLE.
 *          5. Opens the channel 0 and get the param handle.
 *          6. Sets up the edma param entry for channel 0
 *          7. Opens the channel 8 and get the param handle.
 *          8. Sets up the edma param entry  for channel 8
 *          9. Enables the channels using CSL_EDMA3_CMD_CHANNEL_ENABLE
 *          10. Manually trigger the channel 0 using CSL_EDMA3_CMD_CHANNEL_SET.
 *          10. Waits for transfer to complete.
 *          11. Compares the data in the destination buffer is proper or not.
 *          12. Closes the edma module and channel.
 *
 *   @return
 *      NONE
 *
 * =============================================================================
 */
void edma_chain_example (void)
{
    CSL_Edma3Handle             hModule;
//    CSL_Edma3HwSetup            hwSetup;
    CSL_Edma3Obj                edmaObj;
    CSL_Edma3ParamHandle        hParamBasic;
    CSL_Edma3ParamHandle        hParamBasic1;
    CSL_Edma3ChannelObj         chObj;
    CSL_Edma3ChannelObj         chObj1, chObj2;
    CSL_Edma3CmdIntr            regionIntr;
    CSL_Edma3CmdDrae            regionAccess;
    CSL_Edma3ChannelHandle      hChannel;
    CSL_Edma3ChannelHandle      hChannel1, hChannel2;
    CSL_Edma3ParamSetup         myParamSetup;
    CSL_Edma3ParamSetup         myParamSetup1;
    CSL_Edma3Context            context;
    CSL_Edma3ChannelAttr        chAttr;
    CSL_Edma3ChannelAttr        chAttr1, chAttr2;
    CSL_Status                  status;
   
// CSL_Edma3HwDmaChannelSetup dmahwSetup[CSL_EDMA3_NUM_DMACH] =
//         CSL_EDMA3_DMACHANNELSETUP_DEFAULT;
// CSL_Edma3HwQdmaChannelSetup qdmahwSetup[CSL_EDMA3_NUM_QDMACH] =
//         CSL_EDMA3_QDMACHANNELSETUP_DEFAULT;
    volatile Uint32             loopIndex;

   
    printf ("Running Edma Example\n");
   
    /* Module Initialization */
    status = CSL_edma3Init(&context);
    if (status != CSL_SOK) {
        printf ("Edma module initialization failed\n");  
        return;
    }
   
    /* Module level open */
    hModule = CSL_edma3Open(&edmaObj,CSL_EDMA3,NULL,&status);
    if ( (hModule == NULL) || (status != CSL_SOK)) {
        printf ("Edma module open failed\n");   
        return;
    }
#if 0   
    /* Module setup */
    dmahwSetup[CSL_EDMA3_CHA_TEVTLO0].paramNum = CSL_EDMA3_CHA_TEVTLO0;
    dmahwSetup[CSL_EDMA3_CHA_TEVTLO0].que = CSL_EDMA3_QUE_0;
    dmahwSetup[CSL_EDMA3_CHA_CIC3_EVT2].paramNum = CSL_EDMA3_CHA_CIC3_EVT2;
    dmahwSetup[CSL_EDMA3_CHA_CIC3_EVT2].que = CSL_EDMA3_QUE_0;
    hwSetup.dmaChaSetup = &dmahwSetup[0];
    hwSetup.qdmaChaSetup = &qdmahwSetup[0];
    status = CSL_edma3HwSetup(hModule,&hwSetup);
    if (status != CSL_SOK) {
         printf ("Hardware setup failed\n");
         CSL_edma3Close (hModule);
         return;
    }
#endif     
    /* DRAE enable(Bits 0-15) for the shadow region 5 */
    regionAccess.region = CSL_EDMA3_REGION_5 ;
    regionAccess.drae =   (1 << CSL_EDMA3_CHA_TEVTLO0)
          |(1 << CSL_EDMA3_CHA_CIC3_EVT2)
          |(1 << CSL_EDMA3_CHA_TEVTHI1);  
    regionAccess.draeh = 0;
    status = CSL_edma3HwControl(hModule,CSL_EDMA3_CMD_DMAREGION_ENABLE, \
                               &regionAccess);
    if (status != CSL_SOK) {
        printf ("Edma region enable command failed\n");
        return;
    }

    /* Channel 0 open in context of shadow region 5 */
    chAttr.regionNum = CSL_EDMA3_REGION_5;
    chAttr.chaNum = CSL_EDMA3_CHA_TEVTLO0;
    hChannel = CSL_edma3ChannelOpen(&chObj, CSL_EDMA3, &chAttr, &status);  
    if ((hChannel == NULL) || (status != CSL_SOK)) {
        printf ("Edma channel open failed\n");
        return;
    }
   

 CSL_edma3HwChannelSetupParam(hChannel, CSL_EDMA3_CHA_TEVTLO0);
    if (status != CSL_SOK) {
        printf ("Edma channel setup param failed\n");   
        return;
    }

    /* Change Channel Default queue setup to 0 */
    status = CSL_edma3HwChannelSetupQue(hChannel,CSL_EDMA3_QUE_0);
    if (status != CSL_SOK) {
        printf ("Edma channel setup que failed\n");   
        return;
    }
  
    /* Obtain a handle to parameter set 0 */
    hParamBasic = CSL_edma3GetParamHandle(hChannel,0,NULL);
    if (hParamBasic == NULL) {
        printf ("Edma get param handle for param entry 0 failed\n");   
        return;
    }
   
    /* Setup the param set */
    myParamSetup.option = CSL_EDMA3_OPT_MAKE( CSL_EDMA3_ITCCH_DIS, \
                                              CSL_EDMA3_TCCH_EN, \
                                              CSL_EDMA3_ITCINT_DIS, \
                                              CSL_EDMA3_TCINT_EN,\
                                              CSL_EDMA3_CHA_CIC3_EVT2,
                                              CSL_EDMA3_TCC_NORMAL,\
                                              CSL_EDMA3_FIFOWIDTH_NONE, \
                                              CSL_EDMA3_STATIC_DIS, \
                                              CSL_EDMA3_SYNC_AB, \
                                              CSL_EDMA3_ADDRMODE_INCR, \
                                              CSL_EDMA3_ADDRMODE_INCR
                                             );          
    myParamSetup.srcAddr = (Uint32)srcBuff1;        
    myParamSetup.aCntbCnt = CSL_EDMA3_CNT_MAKE(512,1);
    myParamSetup.dstAddr = (Uint32)dstBuff1;       
    myParamSetup.srcDstBidx = CSL_EDMA3_BIDX_MAKE(512,512);    
    myParamSetup.linkBcntrld = CSL_EDMA3_LINKBCNTRLD_MAKE(CSL_EDMA3_LINK_NULL,0);    
    myParamSetup.srcDstCidx = CSL_EDMA3_CIDX_MAKE(0,1);    
    myParamSetup.cCnt = 1;

    status = CSL_edma3ParamSetup(hParamBasic, &myParamSetup);
    if (status != CSL_SOK) {
        printf("Edma parameter entry setup is failed\n");
        return;
    }
   
     /* Channel 8 open in context of shadow region 5 */
    chAttr1.regionNum = CSL_EDMA3_REGION_5;
    chAttr1.chaNum = CSL_EDMA3_CHA_CIC3_EVT2;
    hChannel1 = CSL_edma3ChannelOpen(&chObj1, CSL_EDMA3, &chAttr1, &status);  
    if ((hChannel1 == NULL) || (status != CSL_SOK)) {
        printf ("Edma channel open failed\n");
        return;
    }

 CSL_edma3HwChannelSetupParam(hChannel1, CSL_EDMA3_CHA_CIC3_EVT2);
    if (status != CSL_SOK) {
        printf ("Edma channel setup param failed\n");   
        return;
    }

    /* Change Channel Default queue setup to 0 */
    status = CSL_edma3HwChannelSetupQue(hChannel1,CSL_EDMA3_QUE_0);
    if (status != CSL_SOK) {
        printf ("Edma channel setup que failed\n");   
        return;
    }

    /* Channel 8 open in context of shadow region 5 */
    chAttr2.regionNum = CSL_EDMA3_REGION_5;
    chAttr2.chaNum = CSL_EDMA3_CHA_TEVTHI1;
    hChannel2 = CSL_edma3ChannelOpen(&chObj2, CSL_EDMA3, &chAttr2, &status);  
    if ((hChannel2 == NULL) || (status != CSL_SOK)) {
        printf ("Edma channel open failed\n");
        return;
    }

 CSL_edma3HwChannelSetupParam(hChannel2, CSL_EDMA3_CHA_TEVTHI1);
    if (status != CSL_SOK) {
        printf ("Edma channel setup param failed\n");   
        return;
    }

    /* Change Channel Default queue setup to 0 */
    status = CSL_edma3HwChannelSetupQue(hChannel2,CSL_EDMA3_QUE_0);
    if (status != CSL_SOK) {
        printf ("Edma channel setup que failed\n");   
        return;
    }

   
    /* Obtain a handle to parameter set 8 */
    hParamBasic1 = CSL_edma3GetParamHandle(hChannel1,8,NULL);

    /* Setup the param set */ 
    myParamSetup1.option = CSL_EDMA3_OPT_MAKE(CSL_EDMA3_ITCCH_DIS, \
                                              CSL_EDMA3_TCCH_EN, \
                                              CSL_EDMA3_ITCINT_DIS, \
                                              CSL_EDMA3_TCINT_EN, \
                                              CSL_EDMA3_CHA_TEVTHI1, \
                                              CSL_EDMA3_TCC_NORMAL, \
                                              CSL_EDMA3_FIFOWIDTH_NONE, \
                                              TRUE,CSL_EDMA3_SYNC_AB, \
                                              CSL_EDMA3_ADDRMODE_INCR, \
                                              CSL_EDMA3_ADDRMODE_INCR
                                             );          
    myParamSetup1.srcAddr = (Uint32)srcBuff2;
    myParamSetup1.aCntbCnt = CSL_EDMA3_CNT_MAKE(512,1);
    myParamSetup1.dstAddr = (Uint32)dstBuff2;       
    myParamSetup1.srcDstBidx = CSL_EDMA3_BIDX_MAKE(512,512);    
    myParamSetup1.linkBcntrld = CSL_EDMA3_LINKBCNTRLD_MAKE(CSL_EDMA3_LINK_NULL,0);    
    myParamSetup1.srcDstCidx = CSL_EDMA3_CIDX_MAKE(0,1);    
    myParamSetup1.cCnt = 1;

    status = CSL_edma3ParamSetup(hParamBasic1,&myParamSetup1);
    if (status != CSL_SOK) {
        printf("Edma parameter entry setup is failed\n");
        return;
    }
   
    /* Enable channel 0 */
    status = CSL_edma3HwChannelControl(hChannel,CSL_EDMA3_CMD_CHANNEL_ENABLE, NULL);
    if (status != CSL_SOK) {
        printf("Edma channel enable command for channel 0 is failed\n");
        return;
    }
                                     
    /* Enable channel 8 */
    status = CSL_edma3HwChannelControl(hChannel1,CSL_EDMA3_CMD_CHANNEL_ENABLE, \
                                        NULL);
    if (status != CSL_SOK) {
        printf("Edma channel enable command for channel 8 is failed\n");
        return;
    }
   
    /* Initialize data */
    for (loopIndex = 0; loopIndex < 512; loopIndex++) {
        srcBuff1[loopIndex] = loopIndex;
        srcBuff2[loopIndex] = ~loopIndex;
        dstBuff1[loopIndex] = 0;
        dstBuff2[loopIndex] = 0;       
    }
   
    /* Trigger Channel 0 */
    CSL_edma3HwChannelControl(hChannel,CSL_EDMA3_CMD_CHANNEL_SET,NULL);

    regionIntr.region = CSL_EDMA3_REGION_5;
    do {
        /* Poll on interrupt bit 1 */
        CSL_edma3GetHwStatus(hModule,CSL_EDMA3_QUERY_INTRPEND,&regionIntr);
    } while (!(regionIntr.intr & (1 << CSL_EDMA3_CHA_TEVTHI1)));
   
   
    /* Clear interrupt bits */   
    status = CSL_edma3HwControl(hModule,CSL_EDMA3_CMD_INTRPEND_CLEAR, \
                              &regionIntr);  
    if (status != CSL_SOK) {
        printf("Edma clear interrupt bits command has failed\n");
        return;
    }
   
    /* Check transfer */
    if(Verify_Transfer(512, 1, 1, 0, 0, 0, 0, srcBuff1, dstBuff1,TRUE) == FALSE)
        passStatus = 0;
    if(Verify_Transfer(512, 1, 1, 0, 0, 0, 0, srcBuff2, dstBuff2,TRUE) == FALSE)
        passStatus = 0;
          
    if (passStatus == 1)   
        printf ("<<EXAMPLE PASSED>>: Edma Chain Transfer Passed\n");
    else {
        printf ("<<EXAMPLE FAILED>>: Edma Chain Transfer Failed\n");
        return;
    }   
   
   
    /* Close channel */
    status = CSL_edma3ChannelClose(hChannel);
    if (status != CSL_SOK) {
        printf("Edma channel close failed\n");
        return;
    }
   
    /* Close edma module */
    status = CSL_edma3Close(hModule);
    if (status != CSL_SOK) {
        printf("Edma module close failed\n");
        return;
    }
   
    printf ("=============================================================\n");
   
    return;
}

Allen Yin

您给的程序在编译的时候提示如下的错误，请问是什么原因呢？谢谢！

identifier "CSL_EDMA3_CHA_CIC3_EVT2" is undefined

identifier "CSL_EDMA3_CHA_TEVTHI1" is undefined

identifier "CSL_EDMA3_CHA_TEVTLO0" is undefined

identifier "CSL_EDMA3" is undefined

identifier "passStatus" is undefined

您好，

你需要包含CSL_EDMA相关的头文件，并自己定义一下需要的变量，上述给的只是一个C文件。