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DLPDLCR230NPEVM: usage with Raspberry Pi: The displayed image/video to DLP goes back to default splash screen

René Rüddenklau
Prodigy 10 points
Part Number: DLPDLCR230NPEVM
Other Parts Discussed in Thread: DLPC3436

Hello,
I got a question regarding the DLPDLCR230NPEVM together with the use of a Raspberry Pi Compute Module 4.
I succesfully connected the projector to a standard Rpi 4.

After verifying the functionality I proceeded with a custom board. Here a RPi compute module is connected via the 40 Pin Header with addition of a DSub connector. Therefore the signal length was increased. When I now connect the RPi to the DLP230, I can see the device still on I2C bus 7 with adress 0x1b=(27). But when I initiate the provided sample script init_parallel_mode.py I get:

set slave address: 27
Initializing Raspberry Pi Default Settings for DLPC3436...
Setting DLPC3436 Input Source to Raspberry Pi...
Configuring DLPC3436 Source Settings for Raspberry Pi...

which is fine, but the screen goes back to the splashscreen. All other sampleXX.py scripts work.

Can you give me a hint what the problem could be here? Could it be that I have to increase the GPIO drive strength? If yes how can I change it?
Thank you!

  • 0
    TI__Mastermind 28005 points

    Rene,

    Welcome to the E2E forums and thanks for your interest in our DLP technology.

    If I2C functionality is working but the parallel video feed is not, then you very well may have a problem with your connection interface due to the increased interconnect length. I recommend you see if you can try either adjusting your video timings (reduce pixel clock) or adjust GPIO drive strength. Video timings can be adjusted by adjusting the Raspberry Pi config file. 

    As for GPIO drive strength, check the gpio command. Example setting:

    gpio drive 0 #

    Where # is a value from 0 to 7. Corresponding current settings are documented here:

    https://www.raspberrypi.org/documentation/hardware/raspberrypi/gpio/gpio_pads_control.md

    Regards,

    Philippe