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DM816x - SD PAL display through HDMI

Senthilnathan Maadasamy
Prodigy 160 points

Hi,

      I am working on getting SD PAL (720x576i50) display through HDMI.  The VPSS HDMI guide does not list PAL as a supported format.  Has anyone got this working before?  I tried setting the mode as pal by modifying the file /sys/devices/platform/vpss/display0/mode and also changing the timings to those of pal but it does not help.

Thanks,

Senthil

  • 0
    Prodigy 30 points

    Hi,

    I'm trying to do the same thing with DM814x and I have problems too. In my case I try to support NTSC and I tried the timing:

    echo 27000,720/19/62/57,480/4/15/3,0 > timings

    echo dclkdiff > clksrc

    When I look with a QuantumData analyzer, the clock is not stable, the vsync refresh rate is between 29.5 and 30.5 Hz. If I enter the value from the spec CEA-861-D:

    echo 27000,1440/38/114/124,480/4/15/3,0 > timings

    echo dclk > clksrc

    The clock is now very stable and I able to output the color bar in test mode properly. The problem is that the buffer is 720 pixels large and the VPSS is trying to handle them as 1440 because of the timings. The image is centered and "squeezed" on the monitor. I didn't find any way to specify that this format is pixel repeated (every pixel is repeated twice) even if I specify it in the AVI  INFO FRAME. In the technical reference there's a field name ICLK in VID_CTRL in the HDMI_CORE_SYS but I'm not sure what is the purpose of this field.

    I'm using ezsdk-evm-5_04_00_11. Any help would be appreciated.