嵌入式开发之8127---DM8127如何利用EDMA搬移数据

--------------qq：1327706646

---------------------author：midu

-------------------------------datetime：2013-10-20

1.在sw_osd_ti_dmaOpt.c和sw_osd_ti_dma.c中涉及到了DMA的相关设置，但所有的API都是需要传递一个handle进去，而且所有的API都以SWOSD开头，但我不清楚这个handle需要怎么初始化，如何用在我的算法中。

2,在...\ipnc_rdk\ipnc_mcfw\mcfw\src_bios6\links_c6xdsp\va\valink_alg.c中的VaLink_algCopyFrames()中调用了EDMA.其中有

/* copy the frame */

edmaWidth  = pObj->inQueInfo.chInfo[0].width;

edmaHeight = pObj->inQueInfo.chInfo[0].height;

/* copy Y plane */

DM81XX_EDMA3_setParams(VA_LINK_EDMA3_CH_ID,    // chId

VA_LINK_EDMA3_QUEUE_ID,    // dmaQueue

(UInt32)pFullFrame->addr[0][0],  // srcAddr

(UInt32)pEmptyFrame->addr[0][0], // dstAddr

edmaWidth,              // edmaWidth

edmaHeight,             // edmaHeight

edmaWidth,              // srcLineOffset

edmaWidth);             // dstLineOffset

/* Trigger the edma transfer */

DM81XX_EDMA3_triggerTransfer(VA_LINK_EDMA3_CH_ID);

pEmptyFrame->timeStamp = pFullFrame->timeStamp;

于是我将该段代码添加到了Alglink_priv.c中

Int32 AlgLink_algProcessData(AlgLink_Obj * pObj)

{

extern unsigned char *frame_buffer; //frame_buffer大小为2048*1280；开辟在在DDR 的SR2上

unsigned char * current_frame;

unsigned char * temp;

int edmaWidth = 2048;

int edmaHeight = 1280;

UInt32 frameId, status;

System_LinkInQueParams *pInQueParams;

FVID2_Frame *pFrame;

FVID2_FrameList frameList;

pInQueParams = &pObj->createArgs.inQueParams;

System_getLinksFullFrames(pInQueParams->prevLinkId,

pInQueParams->prevLinkQueId, &frameList);

if (frameList.numFrames)

{

/* SCD should be done first as it requires to operate on raw YUV */

if (pObj->createArgs.enableSCDAlg)      {

status =   AlgLink_ScdalgProcessData(&pObj->scdAlg, &frameList, &pObj->outObj[0].bufOutQue);

if (status == FVID2_SOK)             {

/* Send-out the output bitbuffer */

System_sendLinkCmd(pObj->createArgs.outQueParams.nextLink,

SYSTEM_CMD_NEW_DATA);

}

}

for(frameId=0; frameId<frameList.numFrames; frameId++)         {

pFrame = frameList.frames[frameId];

if(pFrame->channelNum >= pObj->inQueInfo.numCh)

continue;

//*************************************add my alg ****************************//

/* copy the frame */

edmaWidth  = pObj->inQueInfo.chInfo[0].width;

edmaHeight = pObj->inQueInfo.chInfo[0].height;

/* copy Y plane */

DM81XX_EDMA3_setParams(VA_LINK_EDMA3_CH_ID,    // chId

VA_LINK_EDMA3_QUEUE_ID,    // dmaQueue

(UInt32)pFrame->addr[0][0],  // srcAddr

(UInt32)(frame_buffer), // dstAddr

edmaWidth,              // edmaWidth

edmaHeight,             // edmaHeight

edmaWidth,              // srcLineOffset

edmaWidth);             // dstLineOffset

/* Trigger the edma transfer */

DM81XX_EDMA3_triggerTransfer(VA_LINK_EDMA3_CH_ID);

pEmptyFrame->timeStamp = pFullFrame->timeStamp;

//判断数据搬移是否出错

current_frame = (unsigned char *)pFrame->addr[0][0];

temp = frame_buffer;

for(i=0;i<2048*1280;i++){

if(*temp !=*current_frame)

Vps_printf("wrong!!!!!!!");

current_frame++;

temp++;

}

//********************************************************************************//

// do SW OSD

if (pObj->createArgs.enableOSDAlg)             {

AlgLink_OsdalgProcessFrame(&pObj->osdAlg, pFrame);

}

}

System_putLinksEmptyFrames(pInQueParams->prevLinkId,

pInQueParams->prevLinkQueId, &frameList);

}

return FVID2_SOK;

}

编译通过后发现EDMA源地址和目的地址的元素不一致，帧大小为2048*1280没有错，而且我跑的是fullfeature,valink是没有跑的；请问是我的DMA哪里设置不对吗？有谁在8127上用过EDMA的啊？求各位大神指点，小弟在此谢过了！！！

http://www.deyisupport.com/question_answer/dsp_arm/davinci_digital_media_processors/f/39/t/31656.aspx