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demo video_preview on dm648 EVM~

enigma pwd
Intellectual 390 points


hello~

i am a beginner for using dsp.

my devices are as below:

1.dm648 evm board

2.ice: blackhawk usb560m

3.ccs 3.3.82.13

4.bios:5.31.08

5.one camera input to input channel 0 on evm board; one LCD(720x480) screen output with s-video

 

i burned bootloader UBL.ais & video_preview.ais successfully set switches on the board according to user guide.

after reset power,there is no image output on the screen~~

i did not modify video_preview source code,

and the switch4-1~4 on the evm board are all turn off that means:

sw4-1:single channel input

sw4-2:passthrough

sw4-3:NTSC video mode

sw4-4:standard difinition output (s-video)

i have tried to view source and read user guide,but i still d'not understand why~~(no image output)

can someone give a hit to me what's wrong  about my way demo sample code,video_preview??

(i am sorry about my english is not good,and i try the best to explain about my situation...

thanks very much!!!

  • 0
    TI__Genius 17355 points

    Pei,

    Can you run the program after loading it via JTAG under CCS? Does it work there?

    Also, if you connect a UART cable to the board and look at the output it generates during boot, that should give you a clue about whether the device is booting properly or not.

    Also, please note that the UBL was only tested with the booting the DM648 demo program, not any of the example applications, though there is no obvious reason that occurs to me right now why it should not work with other examples.

    Regards, Daniel

  • 0 in reply to Daniel Allred
    Intellectual 390 points

    thanks deniel~

    now i can run the sample program-video_preview after loading it via USB560m jtag emulator,

    and there is image output on my lcd screen.

    but the color of output image is gray,not color,

    i did not modify the source code at all~

    it is no problem that the configuration of my camera and lcd are color

    can i modify the source code to set the output image color??

    can you give me some advice?~thank you very much ,DENIEL!! ^^

  • 0 in reply to enigma pwd
    TI__Genius 17355 points

    Depending on the physical connection you have to the video output, you could see this. I beleive the default output is set to use S-video, but if you try to use that setting with the S-video to composite adapter you will only see the luminance channel. The same issue exists for the full demo and here is the output from the demo release notes related to this:

    - When set to boot/run with standard definition output, the demo starts in composite output
      mode by default.  In this mode, the S-video to composite adapter cable should be used. 
      To switch to S-video output mode, the user must connect with the host application, stop
      the demo, and change the output mode.

    You should be able to modify the code to change the default setting and rebuild the application.

    Regards, Daniel