• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 98 subscribers
  • Views 475 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DM6446 EVM got black screen on LCD

Hoang Vu Luu
Prodigy 50 points

My system:

- CCS v 3.3

- Windows XP

- JTAG 510 USB

- DM6446 EVM board

 

My purpose is: capture video from camera and display on LCD.

I downloaded code examples from here: http://c6000.spectrumdigital.com/davincievm/revf/files/davincievm.zip.

I tested successfully colorbars example  (load video_colorbars.out and display successfully on LCD)

But when I loaded video_loopback.out from example code, on the LCD screen I only got black screen. I already checked all hardware components, they worked well. What should I do to display video on screen?

  • 0
    TI__Genius 14405 points

    Hi,

    I would suggest you to disable capture first, manually put a color pattern (for example, color bar) in the video buffer and check whether you can display the buffer correctly.

    If display works, then we can work on debugging the capture side.

    BTW, what type of output connector are you using to connect VPBE and LCD?

     

    regards,

    Paul

  • 0 in reply to Paul.Yin
    Prodigy 50 points

    To connecting DM6446EVM board and LCD I tried both J8 and J9 (first time I used: J8 (yellow jack) - DAC B-TOP; second time: J9)

    As I said, the colorbars example worked well, I saw the colorbars display on LCD, but in video loopback the screen of LCD is black. I guest maybe in windows doesn't have codec files to support display video on LCD because DVSDK disk for this board only support in Linux

    I also tried to build video loopback project on Ubuntu (CCSv5; dvsdk_2_00_22) but wasn't successfully.

    What should I do with this example? 

    Thanks.

  • 0 in reply to Hoang Vu Luu
    TI__Genius 14405 points

    Hoang,

    If I understood you correctly...

    Basically, you are connecting composite output to your LCD display. You are doing analog display, no LCD driver is needed.

    As I mentioned in my previous reply: let's first find out whether this is capture related or display related

    "I would suggest you to disable capture first, manually put a color pattern (for example, color bar) in the video buffer and check whether you can display the buffer correctly."

    in the video_loopback test case in http://c6000.spectrumdigital.com/davincievm/revf/files/davincievm.zip.

     

    I would suggest debugging this under Linux at the moment.