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PROCESSOR-SDK-DRA8X-TDA4X: TDA4 UDMA usage with BAM framwork.

Dipti Natu
Intellectual 700 points

Part Number: PROCESSOR-SDK-DRA8X-TDA4X

Hi,

PSDK V6.2,

Ubuntu 18.04

I am using appUdmaCopy2D() UDMA for copying 2D block inside one of my DSP kernel, this function is implemented in {psdk_rtos_auto_j7_06_02_00_21}/vision_apps/utils/udma/src/app_udma.c. I took the reference of memcpyC662d() function, defined in {psdk_rtos_auto_j7_06_02_00_21}/vision_apps/kernels/img_proc/c66/vx_image_preprocessing_target.c.

2D block details:

  1. Destination block is declared in DSP's internal L2 memory.
  2. Source block is from External DDR.

Error:

UDMA : ERROR: TR Response not completed!!

Solution tried :

Changed destination block's location from internal L2 to External DDR memory, It worked without any error.

 

Observations :

  1. Both source and destination block should be in External DDR only if we want use UDMA for data transfer.
  2. appUdmaCopy2D() is a blocking call, we can not use it for parallel operation.
  3. appUdmaCopy2D() can not be used to implement ping pong style UDMA usage.

Queries :

  1. How to use UDMA for ping pong style data transfer?
  2. How to use BAM frame work to make UDMA's parallel execution?
  3. Is there any function fo non-blocking function for UDMA data trnasfer? 
  • 0
    TI__Guru 56820 points

    Hi Dipti,

       BAM is not supported for TDA4x. For other queries we have pinged the right person and you should receive the response on them soon.


    Regards,

    ANshu

  • 0 in reply to Anshu Jain
    TI__Genius 10365 points

    Hi Dipti,

    1. Download the latest PSDKRA 7.0 from here,

    2. Look at vision_apps/utils/udma/src/app_udma.c file and look for below functions,

    appUdmaCopyNDInit()
    appUdmaCopyNDTrigger()
    appUdmaCopyNDWait()
    appUdmaCopyNDDeinit()

    This is what your need for non-blocking, multi-dimension transfers between L2 and DDR.

    3. For usage please refer to appUdmaTestNDCopy() in file vision_apps/utils/udma/src/app_udma_test.c or for a more "actual" usage please refer to this implemetation of image pre-processing node which does exactly the ping-pong type of operations.

    vision_apps/kernels/img_proc/c66/vx_image_preprocessing_target.c

    Regards,
    Shyam