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Original question:

Linux/DLPDLCR2000EVM: Integration of Raspberry Pi Video

DLPDLCR2000EVM: Image distorted

Marvn Arcangel
Genius 12395 points
Part Number: DLPDLCR2000EVM

Hi Team,

A customer is having an issue with the output projected by DLPDLCR2000EVM interfaced with a Rasberry pi. The projected image was jittering and distorted. 

I have instructed the customer to use equal-length jumper wire and relax the timing requirements which they lowered from 32 MHz to about 8 MHz, which solved the flickering issue (almost) entirely. I also told the customer to follow this thread (e2e.ti.com/.../linux-dlpdlcr2000evm-integration-of-raspberry-pi-video/2405155#2405155%20After%20that%20I%20ended%20up%20with%20a%20visual%20output%20that%20was%20shaking,%20and%20flickering.)

Unfortunately, the image was slanted diagonally as seen below:

Can you help further?

Regards,

Marvin

  • 0
    TI__Expert 3905 points

    Hello Marvin,

    It is likely that the input data is a different size than the native resolution of the 0.2 DMD, causing image warping. I would recommend setting the correct nHD resolution, 640x360, on both the Raspberry Pi and the controller via I2C to see if that resolves the issue.

    Best,

    Maxine

  • 0 in reply to Maxine Cabrasawan
    TI__Genius 12395 points

    Hi Maxine,

    Thank you for the suggestion. It seems to fix the issue.

    I have a follow-up question, the customer would like the DMD to reflect an external light source that does not need 3 colors, just a way to set the single micromirrors into a specific state. Is there a way to do this with the EVM?

    Thanks!

    Regards,

    Marvin

  • 0 in reply to Marvn Arcangel
    TI__Expert 3905 points

    Hello Marvin,

    I am glad the issue was resolved. As for your follow-up question, the DLPDLCR2000 EVM cannot be controlled in that way. It is from the Display line and is RGB only. For the requested application, the customer must use a Light Control DMD.

    Best,

    Maxine