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DLP230NP: Parallel mode

Seung Han Kim
Prodigy 10 points
Part Number: DLP230NP

Tool/software:

Hello, I have finished setting up the DLP230NPEVM following the Quick start instructions.

The given samples run well, but when I run init_parallel_mode.py, only a black screen appears.

Is there anything I missed?

Thank you.

     

              <sample02_splash>                   <init_parallel_mode.py>

  • 0
    TI__Expert 3755 points

    Hello Kim,

    Please check the video timings for parallel interface configured in raspberry config.
    We do have a sample timings config and also few timing in user guide. 
    Please use these timings and see if you still face the same issue 

    Regards,

    Akhil

  • 0 in reply to Akhil Guntumadugu
    Prodigy 10 points

    Hello Akhil, I apologize for being late.

    As you mentioned, I have changed the video timing, but there have been no other changes.

    Following the instructions in Table 9-1. of the user guide, I adjusted the Frame Rate(58Hz~61Hz) and Pixel Frequency(125MHz~132MHz) values under the original HDMI timing settings:

    hdmi_group=2

    hdmi_mode=87

    I also tested with the default settings ' hdmi_mode=82(1080p@60)' and ' 85(720p@60)', but the parallel mode still didn't work. However, other sample codes did work as expected. did I change a parameter that wasn't relevant?

    Thank you.

    Best regards,

    Kim

  • 0 in reply to Seung Han Kim
    TI__Expert 5750 points

    Hello Kim,

    The hdmi_group and hdmi_mode should not be edited at all when using the TI provided config file.

    You can try editing the dpi_group, dpi_mode, and hdmi_timings at the bottom of the TI provided config file. 

    The GPIO drive strength may need to be raised to run at higher frame rates than the default 58 Hz. The wiringPi tool had since been deprecated but there is unofficial support in forums for getting this to work. You may have to look around.

    Looking at the table again, the hdmi_timings should be changed and the GPIO drive strength will need to be increased.

    Best,

    John