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embv_pc1300c demo

kcox@sgss.com

I have a working embv_p1300c project on a Zynq 7020 from the Avnet P1300C embedded vision kit reference design.  I am trying to access the output of the Chroma Resampler inside my C application on the PS.  vdma_1 output is hardcoded in the demo code to DDR address 0x18000000 (See lines below).  In the example main.c the  WriteSetup and ReadSetup calls for axivdma1s have vertical and  horizontal stride values of 2048. Why are they not 1280 and 1024 to match the image geometry?

WriteSetup(pdemo->paxivdma1, 0x18000000, 0, 1, 1, 0, 0, 1280, 1024, 2048,2048);

ReadSetup(pdemo->paxivdma1, 0x18000000, 0, 1, 1, 0, 0, 1280, 1024, 2048,2048);

 

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  • 0

    stride is specified in bytes

    therefore, for a width of 1024, for 16 bits pixels, the corresponding stride is 2048

    also note that the stride can be larger than the required byte width

    feel free to change the values according to your needs

    regards,

    Mario.

  • 0 in reply to albertabeef

    Mario

    Thanks for the reply.  Looking at WriteSetup  in .../python1300c_fb_app.c\src\xaxivdma_ext.c there is already a *2 on the var horiStride, that is then put into the config.  I assumed this was the 2 byte conversion.  I have a working version of the python1300c_fp_app where I pull the frames from VDM engine and send them over ethernet to an image viewer.  With 2048 I get a skewed image because the stride is double what it should be.  When I change it to 1280/1024 it works.  Also both stride values were set to 2048, yet the frame width is 1280 so you would expect it to be 2560 instead of 2048.  

     

    Kevn