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DM816x Display using 8 bits and discrete sync signals

David Soto - RidgeRun
Genius 3700 points

Hi,

   I am using the DM816x and we are interested on doing dual display using 8 bits for the outputs with discrete sync signals, would this be possible with the RDK or the EZSDK?

According to:

http://processors.wiki.ti.com/index.php/DM816X_AM389X_VPSS_Video_Driver_User_Guide

single, double, triple, doublediscrete and triplediscrete are supported. However, in case of single it seems that just embedded sync mode is supported.

For some reason if you configure the board to output in the single mode it still shows the discrete sync signals but they are not correct. I am checking the hdvpss driver to see why this would happen and if it would be possible to fix the discrete sync signals on this case, Any idea if it is possible? any hardware limitation?

Thanks,

-David

  • 0
    TI__Guru**** 477525 points

    Hi David,

     

    VENC does not support discrete sync output in 8bit mode. There is no way to configure VENC to output discrete sync in 8bit mode.

    Having said that, it does not matter how VENC is configured, it always outputs sync signals. But it looks like it is not correct for the 8bit mode. We may need to change some timing information to get it corrected. Could you please tell what is the difference that you are seeing?

     

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    Genius 3700 points

    Hi Brijesh,

        We are in the process of checking the possible differences between the correct timing and the one that is being sent by the board. At this point, it seems that the only change that is needed is to delay HSYNC 88 clock cycles, I will be trying to do this in the hdVencSetModeTiming function, if you find something please let me know,

    -David