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Composite / S-Video display on DM814x EVM

Mitul Chokshi
Intellectual 405 points

Hi,

I'm want to use composite video or s-video for display on DM814x EVM.

I've modified load-hdvpss-firmware.sh script under /etc/init.d as: modprobe vpss sbufaddr=0xBFB00000 mode=sd:ntsc debug=1 i2c_mode=1

And I'm trying to display color bar on /dev/fb0 using saFbdevDisplay application provided in ezSDK. But I don't see anything on s-video or composite video.

Please let me know if I need to do any settings to enable these devices.

 

Regards,

Mitul

  • 0
    Intellectual 430 points

    Hi Mitul,

    I'm trying to do something similar, except I've left the load-hd-firmware.sh script as it is so that it creates /dev/fb0 (HDMI), /dev/fb1 (LCD) and /dev/fb2 (S-video) for me to use. I have a test application that can through up colors or test bars to a framebuffer and when I run that against /dev/fb0 the LCD that is connected to the HDMI connector shows the contents no problem.

    When I do the same thing with /dev/fb2, I get the output momentarily on the S-Video connector but it disappears a moment later. Interestingly, I can write the SAME data back to the frambuffer and it shows up on the S-Video again..

    My current settings are:

    ./display0/mode - 1080p-60
    ./display1/mode - 1080p-60
    ./display2/mode - ntsc

    ./graphics0/nodes - 1:hdmi
    ./graphics1/nodes - 1:dvo2
    ./graphics2/nodes - 1:sd

    ./video0/nodes - vcompmux:hdmi
    ./video1/nodes - hdcompmux:dvo2
    ./video2/nodes - sdmux:sd

  • 0 in reply to Ashwin Bihari
    TI__Mastermind 20245 points

    Hi,

    By default grpx is connected in below way. You can change this using sysfs entries. Please refer to video driver user guide on how to route grpx to different display.

    ./graphics0/nodes - 1:hdmi
    ./graphics1/nodes - 1:dvo2
    ./graphics2/nodes - 1:sd