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Thread: DE10-Lite Video problem drawing a pixel

  1. #1
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    Default DE10-Lite Video problem drawing a pixel

    Hi, I'm making a project for my university and I'm working on a Videogame with a DE10-Lite.
    I'm trying to get the video processing working and everything is fine except one problem:

    If I try to draw the 0,0 pixel with a color containing a blue signal (Blue component different from 0) the video goes crazy and everything starts flickering

    If I draw a red or yellow color on 0,0 everything is fine. As long as the Blue bits of the pixel 0,0 are set to 0 it works.

    Here you can see:

    No blue on 0,0 pixel and the video is fine:
    https://ibb.co/dWmdTy

    I put 0x0001 on the 0,0 pixel and madness happens:
    https://ibb.co/gwpMgJ

    I'm using a 16 bit Pixel buffer with DMA reading SDRAM linked with other video IPS. The output signal goes to a VGA monitor.

    Here is the embedded system built with Qsys:


    If I draw blue on the 0,0 pixel, even the video signal coming from the char buffer is heavily disturbed. I can't manage to understand what could be causing the problem.

    Any help is appreciated, thanks.
    Attached Images Attached Images
    Last edited by Dario94B; May 9th, 2018 at 10:36 AM.

  2. #2
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    Default Re: DE10-Lite Video problem drawing a pixel

    Hi,

    It may be synchronization or timing issue.

    1. Monitor the vsync, hsync & blank period.
    2. Give different values on the 0,0 pixel and see whether you are facing the same issue.

    Best Regards,
    Anand Raj Shankar
    (This message was posted on behalf of Intel Corporation)

  3. #3
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    Default Re: DE10-Lite Video problem drawing a pixel

    Quote Originally Posted by Anand Raj Shankar View Post
    Hi,

    It may be synchronization or timing issue.

    1. Monitor the vsync, hsync & blank period.
    2. Give different values on the 0,0 pixel and see whether you are facing the same issue.

    Best Regards,
    Anand Raj Shankar
    (This message was posted on behalf of Intel Corporation)
    Than you Anand Raj Shankar for your answer,
    I will check the h_sync, v_sync and blank signals as soo as I can go to the lab.

    Meanwhile I can tell you that I set the Clocked Video Output module like this:



    disp_clk is a clock signal @25 MHz from the PLL

    I wish to use a 640x480(60 Hz) format. Is there anythik wrond with it?

    Best regards, Dario B.

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