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How to change the display resolution of reference design "HDMI Display controller Tutorial for Vivado using Xilinx VIPP"

Former Member

Hello everyone,

I has successfully implemented reference design "Zedboard HDMI Display Controller Tutorial for Vivado using Xilinx VIPP" on Zedboard with HDMI out at VIDEO_RESOLUTION_1080P.

The reference design supports many resolutions, however when I tried to modify the resolution to 480p, there's nothing showed on the monitor, it displayed "No Signal" only. I edited the resolution here:

   pDemo->hdmio_resolution = VIDEO_RESOLUTION_1080P;
   pDemo->hdmio_width  = 1920;
   pDemo->hdmio_height = 1080;

Could someone help me on how to change the display resolution?

Thank you.

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  • 0

    Hello,

    Glad to hear that you were successful in creating the HDMI display controller design with the tutorial.

    One important thing to know is that there are two main factors that will affect the video resolution being generated:

    1) pixel frequency : in the tutorial, this has been fixed to 148.5 MHz (for 1080P60 video resolution)

    2) video timing : this consists of the vertical and horizontal timing details (front porch, sync width, back porch, active area) specific to each video resolution : in the tutorial, the video_resolutions.c source code contains the values timing values for various resolutions.  The vgen_config function performs the detailed configuration based on the ResolutionID provided.

    This being said, and to answer your question, in order to achieve 480P60 resolution, you will need to change the pixel frequency for this resolution. If my memory is correct, this would be 27MHz.

    In the tutorial, a Clock Wizard is instantiated and programmed for the video resolution's frequency.  You simply need to reconfigure this Clock Wizard to generate 27MHz.  Rebuilding the design, combined with your software modificcations should generate the video resolution you need.

    Hope this helps !

    Regards,

    Mario.

  • 0 in reply to albertabeef

    Hello,

    Thank you for your reply,

    I have tried to modify both the FPGA (clock wizard) and resolution to 480p (720x480) but it did not work.

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