• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 99 subscribers
  • Views 1430 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.

Linux/SN65DSI84: Test Pattern always blank

Kermith Galang
Prodigy 50 points
Part Number: SN65DSI84

Tool/software: Linux

Hi all,

I am currently trying to enable the driver for DSI to LVDS, I am trying to initiate the test pattern based from this specs

but for some reason, it always displays black, hoping someone can help me with the correct register setting for this specs

  • 0
    TI__Guru**** 161600 points
    Hi,

    Which processor are you using?
    Also which Linux SDK have you ported on your board?

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    Expert 2020 points
    Hi Kermith,

    Please give us more information regarding your target board, SDK, camera sensor you are interfacing etc.
    In addition to your experiments, you need to configure the registers of SN65DSI84 to generate test pattern. Have a look at the below guide fromTI.
    www.ti.com/.../slla332b.pdf

    Thanks,
    Prabhuraj
    BlackPepper Technologies
  • 0 in reply to Yordan Kovachev
    Prodigy 50 points
    Hi Yordan,

    thanks for the reply, to answer the question, I am running on android platform but for now,
    I think the hardware can be abstract since I am aiming to run the Test Pattern for now
    I am developing custom driver for SN65DSI84 and for some reason, the test pattern only shows black display.

    i2c communication is already established
    DSI clock input is already established running at 420Mhz
    LVDS output is now configured to divide by 7 which gives me 70Mhz, required by my LCD

    so here is the summary. of my driver

    software reset
    PLL disabled

    LCD settings for Horizontal and vertical
    Sync
    Porch front and back

    Test Pattern = 0x16 (enabled)

    PLL enabled
    software reset


    Still no display for test pattern, so my conclusion is that it may have something to do with
    LCD horizontal/vertical settings
    Sync
    Porch front and back

    Hope you can help me, thanks