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DM368 Display Problem

Doug Goss
Intellectual 290 points

We have two designs that use the DM368 to decode H.264 video.

Most of the time, the video looks fine. However, on some boards, some of the time, we get this.

 

This image comes out the Analog component out of the video encoder. We get the same thing coming out of the digital outputs on a different board.

Any ideas of what might be causing this?

Thanks,
Doug

  • 0
    TI__Expert 4685 points

    Doug,

    more details are needed. when the issue happens, what is the configuration?


  • 0 in reply to Nagabhushana
    TI__Mastermind 19985 points

    Doug,

    One potential problem could be the buffer management. The decoder output buffer might not be correctly going into the display resulting in such problem. To ensure that it could be buffer problem, can you fill the buffers with some known pattern like a green color or black color and also once this problem occurs, possibly stop the processor and dump the memory buffer used by display. I can guide you with register addresses showing the exact buffer address, if you want.

    Do you recover from this situation or is it stuck like this forever?

    Regards,

    Anshuman

     

  • 0 in reply to Anshuman Saxena
    Intellectual 290 points

    We found the problem. We were not implementing Advisory 1.2.1 in the DM368 Errata. My software guy thought that we were using a version of U-Boot that implemented it, but it turns out that we were not. The boards now never go into this fail mode.

    Thanks

  • 0 in reply to Doug Goss
    Expert 2150 points

    hi,Doug,

    what's you mean about Advisory 1.2.1? i just want to konw what's the version you are using or, what's should be modified on the official code ?

    we get the same problem on our lcd(parallel).

    thinks in advance.

    regards, Mike.

     

  • 0 in reply to zanget
    Intellectual 290 points

    Mike,

    Advisory 1.2.1 in the DM368 errata describes a problem that occurs when certain portions of the DM368 (or DM365) do not properly reset. It describes a software reset process that should be initiated, at powerup, to make sure that the entire IC is reset.

    The latest version of the bootloader has this code.

    Doug

  • 0 in reply to Doug Goss
    Expert 2150 points

    hi,Doug

    after googled, i found that Advisory 1.2.1

    The Buffer Logic of VPSS is Not Reset by System Reset Pin

    i think we are talking about is here

    http://focus.ti.com.cn/cn/lit/er/sprz316a/sprz316a.pdf

    Doug Goss said:

    Mike,

    Advisory 1.2.1 in the DM368 errata describes a problem that occurs when certain portions of the DM368 (or DM365) do not properly reset. It describes a software reset process that should be initiated, at powerup, to make sure that the entire IC is reset.

    The latest version of the bootloader has this code.

    Doug

     

    regards, Mike

  • 0 in reply to zanget
    Intellectual 290 points

    Yes, that is what i'm talking about. Did it fix your problem?

  • 0 in reply to Doug Goss
    Expert 2150 points

    i dont konw. it's a little different between yours.

    i get the problem that the LCD sometime doesnot display anything but just white after reboot but sometime it doesnot

     regards, Mike