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EDMA3 LLD vs. ACPY3 Speed

babs76
Intellectual 390 points


Hello,

I'm using a DM6467 and have recently switched to the EDMA3 LLD from ACPY3 because I need to do 3D transfers. As a basic test I am transferring a 720p image from input buffer to output buffer on the DSP. I'm mimicing the edma3_test_poll_mode() example for the LLD and have noticed that the LLD is about 1 ms slower than ACPY3 for this task. For both the LLD and ACPY3 I essentially have parameters set as ACNT = 1280, BCNT=720*2, CCNT=1. I will be using 3D transfers later.

Does anyone know the reason for this 1 ms difference? I'm still coming up to speed on the differences between EDMA3/QDMA channels.

Thanks,

 

Brent

  • TI__Expert 6065 points

     

    Brent,

    I needed some more info on this.
    What is the version of LLD and FC are you using to test it?
    What kind of transfer you are initializing, Can you send the opt register value in PARAM
    Are you trying to get the timings from any of the examples provided in the LLD package

    Prasad