TMS320C6678: TI 编译器对数组复制会做哪些优化，编译器优化不会EDMA更高效么

wu dan

Part Number: TMS320C6678

/* Poll on IPR bit 0 */
do {
CSL_edma3GetHwStatus(hModule,CSL_EDMA3_QUERY_INTRPEND,&regionIntr);
} while (!(regionIntr.intr & 0x1));

EDMA传输采用这种轮询的方式查传输是否完成，会影响运算性能么（轮询的同时，单核可以进行其他的运算工作么）

over 1 year ago

0 wu dan over 1 year ago

Prodigy 20 points

对EDMA传输不是很了解，一个数组传到另一个数组，是不是就相当于数组复制

0 wu dan over 1 year ago in reply to wu dan

Prodigy 20 points

我测试了一下，1024个float型数组复制给另一个数组，编译器优化比EDMA传输快一倍，但我们使用EDMA，源数组和目的数组分别在不同的存储区，传输结果有的正确有的不正确，使用的是EDMA3CC0通道控制器，共享内存传输到DDR3结果没问题，反过来结果就是错的了，不知道是不是代码有问题

0 wu dan over 1 year ago in reply to wu dan

Prodigy 20 points

    /* Module Initialization */
    CSL_edma3Init(&context);


    /* Open the EDMA Module using the provided instance number */
 	 hModule = CSL_edma3Open(&edmaObj, instNum, NULL, &status);


    /* Channel open */
    chAttr.regionNum = CSL_EDMA3_REGION_GLOBAL;
    chAttr.chaNum    = channelNum;
    hChannel = CSL_edma3ChannelOpen(&chObj, instNum, &chAttr, &status);


    /* For first EDMA instance there are only 2 TCs and 2 event queues
	 * Modify the channel default queue setup from 0 to 1
	 */
    CSL_edma3HwChannelSetupQue(hChannel,CSL_EDMA3_QUE_1);


    /* Map the DMA Channel to PARAM Block 1. */
    CSL_edma3MapDMAChannelToParamBlock (hModule, channelNum, 1);
    /* Obtain a handle to parameter set 1 */
    htrans = CSL_edma3GetParamHandle(hChannel, 1, &status);


	myParamSetup.option = CSL_EDMA3_OPT_MAKE(CSL_EDMA3_ITCCH_DIS, \
											CSL_EDMA3_TCCH_DIS, \
											CSL_EDMA3_ITCINT_DIS, \
											CSL_EDMA3_TCINT_EN, \
											0, CSL_EDMA3_TCC_NORMAL,\
											CSL_EDMA3_FIFOWIDTH_NONE, \
											CSL_EDMA3_STATIC_EN, \
											CSL_EDMA3_SYNC_A, \
											CSL_EDMA3_ADDRMODE_INCR, \
											CSL_EDMA3_ADDRMODE_INCR );
	myParamSetup.srcAddr    = (Uint32)srcBuff1;
	myParamSetup.aCntbCnt   = CSL_EDMA3_CNT_MAKE(1024*4,1);
	myParamSetup.dstAddr    = (Uint32)dstBuff1;
	myParamSetup.srcDstBidx = CSL_EDMA3_BIDX_MAKE(1024*4,1024*4);
	myParamSetup.linkBcntrld= CSL_EDMA3_LINKBCNTRLD_MAKE(0xffff,0);
	myParamSetup.srcDstCidx = CSL_EDMA3_CIDX_MAKE(1024*4,1024*4);
	myParamSetup.cCnt = 1;

    /* htrans setup */
	CSL_edma3ParamSetup(htrans,&myParamSetup);


    /* Interrupt enable (Bits 0-1)  for the global region interrupts */
    regionIntr.region = CSL_EDMA3_REGION_GLOBAL;
    regionIntr.intr   = 0x1;
    regionIntr.intrh  = 0x0000;
    CSL_edma3HwControl(hModule,CSL_EDMA3_CMD_INTR_ENABLE,&regionIntr);

    /* Trigger channel */
    CSL_edma3HwChannelControl(hChannel,CSL_EDMA3_CMD_CHANNEL_SET,NULL);

    regionIntr.region = CSL_EDMA3_REGION_GLOBAL;
    regionIntr.intr   = 0;
    regionIntr.intrh  = 0;

    /* Poll on IPR bit 0 */
    do {
        CSL_edma3GetHwStatus(hModule,CSL_EDMA3_QUERY_INTRPEND,&regionIntr);
    } while (!(regionIntr.intr & 0x1));

    /* Clear the pending bit */
    CSL_edma3HwControl(hModule,CSL_EDMA3_CMD_INTRPEND_CLEAR,&regionIntr);


    /* Check transfer by comparing the source and destination buffers */
    Verify_Transfer( 1024, 1, 1, 0, 0, 0, 0, srcBuff1, dstBuff1, TRUE);




	/* Close channel */
    CSL_edma3ChannelClose(hChannel);


	/* Close EDMA module */
	CSL_edma3Close(hModule);

这个是我们的参数配置