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Altera_Forum's avatar
Altera_Forum
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17 years ago

DE2 TV Decoder

Hi,

I've been trying to make the TV Decoder design work on the DE2 board, and haven't been able to! I've tried both versions (PCB 1.x and 2.x) and neither worked. I remember I had tried it long time ago with my older camera as input, and it worked with a bit of video flicker, but now I don't have that camera any more and it just doesn't work with any source that I have. There's just simply no output to the VGA. I know the VGA works as the default program is working fine.

Has anyone else experienced similar behavior? At first I thought my board was not working, but then I realized it's the case with other boards too. To me it seems that the decoder can not sync to the input video. I say that because I wrote my own program to decode the input signal and display it, but the video flickers a lot. Could it be the configuration sent to the decoder?

I'd appreciate any suggestions,

Kaveh

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  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Same flickering problem also applies to me.

    I have more than 5 DE2 boards.

    With a same video input, and a video output(to LCD monitor), I just replaced the target DE2 board with another one.

    For the DE2_Video_In example in UPDS, just one DE2 board showed good video output with no flicker.

    But, the rest always showed flickering problem with different level of flickering.

    Also for the good DE2 board, if I execute some light software with the derivatives of Video_In, flickering appears.

    In debug mode with the derivative of the DE2_Video_In, the pixel memory written by the UP Video DMA controller sometimes showed incorrect data (all zeros, or just small section of pixel buffer is written for continuous addressing mode).

    The Video_In_Decoder(altera_up_avalon_video_decoder.v) verilog design in UPDS does not use the HSync(TD_HS) and VSync(TD_VS) inputs, but only TD_DATA and TD_CLK27 to .

    I suspect that the reason that the flickering problem depends on a DE2 board is due to the different synchronization per board.

    Is there any one to solve this flickering problem? Your experience would be very helpful to me.
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Just a suggestion...

    Did you connect all video input boards together in parallel, without an input video buffer distributor ?

    If you did it, I can see how the video signal is in degrade.

    Cheers.

    Alberto.
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    I am getting a pink color frames... and rotating video.... with DE2_TV...?

    can any one help...

    also i need to know how to configure video ADC ?

    Please reply here or at laukikd @ gmail . com
  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    Hi BTXSistemas

    Its an old thread though but I m just wondering if you still have the code for DE2_TV. Please upload if you can...I need one badly

    Thanks

    Mat
  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    Mat, DE2_TV code is in the DE2 CD. Just download it and you'll get.

    Cheers.

    Alberto.

    --- Quote Start ---

    Hi BTXSistemas

    Its an old thread though but I m just wondering if you still have the code for DE2_TV. Please upload if you can...I need one badly

    Thanks

    Mat

    --- Quote End ---

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    Hi, in my case the DE2_TV is working properly, but if i make a little change 5 little vertical lines appear in the screen over the image

    :(