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Davinci Digital Video

epalmer
Prodigy 80 points

Other Parts Discussed in Thread: THS8200

I am trying to run video on a Davinci EVM connected to a THS8200 EVM, to drive an LCD display. I have connected the 2 EVM boards as per spraan0, Figure 12. We are running the DECODEHD demo and are getting the error: "Decode Error Failed to open video decode algorithm". We have confirmed that the Davinci EVM is communicating with the THS8200. I am not seeing any of the video signals toggling on the Davinci EVM. Any assistance is greatly appreciated.

Regards,

Eric

  • TI__Mastermind 37340 points

    What version of the DVSDK are you using?

    Please note that the App Note was based on an old DVSDK (1_10_00_32) and has not been updated, primarily becuase digital video output support has been added to the Linux drivers (these were not available when app note was written).  Therefore, you may want to refer to the PSP documentation to figure how to configure the new drivers to output digital video.

  • in reply to Juan Gonzales
    Prodigy 80 points

    We are running  1_30_01_41. With this newer version, we had to make changes to the makefile to get it to build. It did build, but the changes still may not be correct. Can you be more specific regarding the PSP documentation? We looked at the datasheets and App Notes. Code examples would be helpful.

    Thanks.

  • in reply to epalmer
    TI__Mastermind 37340 points

    The way to enable digital video output (versus analog) and pixel format (prgb, yuv) is via u-boot bootargs environment variable.  These details are discussed in the documentation included under

    PSP_XX_XX_XX_XX/docs

    There you will find docs on how to use resizer, previwer, vpbe, among other things.  There is also an examples directory under the PSP_XX_XX_XX_XX directory that has exmaples for some of the more difficult to use drivers.

    Let me know if this helps.