DM8148 ARM loading too high when copy YUV raw data to memory

Hi Alfred,

Using the DMA controller to transfer bulks of data (like YUV raw data) from peripheral to memory (and vice versa) should off-load the ARM significantly.

Best Regards,

Pavel

How to use DMA Controller?  Could you show me some sampe code?

Hi Cindy,

Cindy Lee said:

How to use DMA Controller?  Could you show me some sampe code?

You can refer to below resources:

http://processors.wiki.ti.com/index.php/TI81XX_PSP_EDMA_Driver_User_Guide

http://processors.wiki.ti.com/index.php/EDMA_sample_test_application

ti-ezsdk_dm814x-evm_5_05_02_00/example-applications/linux-driver-examples-psp04.04.00.01/edma/

DM814x TRM, chapter 8 EDMA, section 8.5 EDMA Transfer Examples, section 8.8 Setting Up a Transfer

Regards,
Pavel

Thank you for your reply!

now I use osa_dma mechanism. 

But it dose not work, because OSA_dmaInit() failed. please refer to code below:

          IpcFramesInLink_getFullVideoFrames(SYSTEM_HOST_LINK_ID_IPC_FRAMES_IN_0, &bufList);

          buf = &bufList.frames[0];     

           OSA_DmaChHndl g_dmaHndl;
                Vsys_AllocBufInfo g_frameBufInfo;
                Vsys_allocBuf(SHARED_REGION_ID, 720 *480 * 2 /** 2*/, 16, &g_frameBufInfo);

                g_dma_status = OSA_dmaInit();
                if (g_dma_status = OSA_EFAIL)
                {
                    printf("dma init failed!\n");
                }

               
                g_dma_status = OSA_dmaOpen(&g_dmaHndl, OSA_DMA_MODE_NORMAL, 1/* * 2*/);
                if (g_dma_status = OSA_EFAIL)
                {
                    printf("dma open failed!\n");
                }

                OSA_DmaCopy1D copy1D;
                copy1D.srcPhysAddr = (unsigned int)buf->phyAddr[0][0] -offset;
                copy1D.dstPhysAddr = g_frameBufInfo.physAddr;
                copy1D.size = (buf->frameWidth * buf->frameHeight) * 2;
                int status_copy_1D = -1;
                status_copy_1D = OSA_dmaCopy1D(&g_dmaHndl, &copy1D, 1);

                OSA_dmaClose(&g_dmaHndl);
                OSA_dmaExit();
                Vsys_freeBuf(SHARED_REGION_ID, g_frameBufInfo.virtAddr, 720 *480 * 2);

Cindy,

Cindy Lee said:

now I use osa_dma mechanism. 

I am working with DM814x EZSDK, and I can not find this osa_dma mechanism! Are you working with EZSDK or other DM814x SDK (IPNC RDK, DVR RDK)?

Regards,
Pavel

I am working with DVR RDK.

Cindy,

Cindy Lee said:

I am working with DVR RDK.

I would recommend you to create new post with DVR RDK in the title, thus our DVR RDK team will see it and response.

Regards,
Pavel

Thank you very much!