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Driving 1360x768 HDMI from Zedboard

henry10210

Hello, I've been using 1280x1024 DVI monitor with Zedboard ever since I started (I think I also used 1680x960 early on) without a problem.  I got a new HDMI monitor, and I don't see the penguins using the same Ubuntu on Zedboard HW I've been using all along.

I posed the same question on the ADI engineer zone, but I suspect Lars (the driver author) will come back with a suggestion to stare at the kernel/drivers/gpu/drm/xilinx folder (which I am doing at the moment).  God knows how long it will take for me to debug the problem this way (although I will wind up learning a lot).

Has anyone ever driven my monitor size successfully?  Has anyone driven ANY HDMI monitor resolution?  Does anyone know if there is such a thing as a supported monitor with ADV7511 design on Zedboard?

  • 0

    Henry,

    Although this is not an answer to your question, hopefully it will help you to find the answer.

    Do you know the pixel rate for this resolution ?

    Do you know the following timing details for this resolution ?

       horizontal configuration (in cycles)

          front porch ?

          back porch ?

          active region ?  1360

          sync width ?

          sync polarity ?

       vertical configuration (in lines)

          front porch ?

          back porch ?

          active region ?  768

          sync width ?

          sync polarity ?

    I often go back to a bare metal (no operating system) design to validate an interface that is not working.

    The following design is much less flexible than the ADI design, since it displays a single static video resolution.  However, it may give you more control to validate the pixel rate and timing details to drive your monitor.

       http://zedboard.org/content/zedboard-hdmi-vipp-vivado-20141

    If you use this design, you will have to modify it as follows for use with a different video resolution:

       pixel rate

       - modify the Vivado IPI block design to set the appropriate frequency (pixel rate) for your video resolution

       video timing

       - modify the IP cores in the zed_hdmi_display sub-module, to configure for your video resolution

       - modify the source code for your video resolution

          - video_resolution.c/.h : add a new video timing configuration in the vres_resolutions[] array

          - zed_hdmi_display.c : change the following lines to set for your video resolution

                  // Set HDMI output to 1080P60 resolution
                  pDemo->hdmio_resolution = VIDEO_RESOLUTION_1080P;
                  pDemo->hdmio_width  = 1920;
                  pDemo->hdmio_height = 1080;

    Hope this helps !

    Regards,

    Mario.

  • 0

    Thank you so much for the suggestions Mario, I don't have such timing information.  I wonder whether that's in the ADV7511 datasheet.  Anyway, I just tried my Qt GUI on a whim, and I see it on the HDMI monitor!  So the only problem seems to be seeing the penguins on boot.  The files you suggested will be helpful if I want to dig deep into video FW later.  Thanks again!