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Linux/DLP2000: problem with Raspberry Pi 3 B+ model

Youngju lee
Prodigy 15 points
Part Number: DLP2000


Tool/software: Linux

Dear Sir or Madam.

I got some problems with Rapsberry Pi 3 b+ model .

DLP2000 is not work even if it it connected as recommended by TI and "frederickvandenbosch.be" site

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/boot//config.txt

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# Add support for software i2c on gpio pins
dtoverlay=i2c-gpio,i2c_gpio_sda=23,i2c_gpio_scl=24,i2c_gpio_delay_us=2
 
# DPI Video Setup
dtoverlay=dpi18
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0
framebuffer_width=854
framebuffer_height=480
enable_dpi_lcd=1
display_default_lcd=1
dpi_group=2
dpi_mode=87
 
dpi_output_format=458773
hdmi_timings=854 0 14 4 12 480 0 2 3 9 0 0 0 60 0 32000000 3

and /etc/rc.local

pi@raspberrypi:~ $ sudo nano /etc/rc.local
 
...
sudo i2cset -y 3 0x1b 0x0c 0x00 0x00 0x00 0x13 i
sudo i2cset -y 3 0x1b 0x0b 0x00 0x00 0x00 0x00 i
 
exit 0
--------------------------------------------------------------------------------------------------

The screen does not work cleanly. Please check my screen shots.

I think  there seems to be a problem with sync( HSYNC , VSYNC and etc.)

Please help me.

  • 0
    TI__Mastermind 23090 points

    Dear Youngiu Lee, 

    Welcome to DLP forum and thank you for your interest in DLP technology.

    Is EVM working in standalone mode i..e when you power up and not connected Raspberry pi?

    regards,

    Vivek

  • 0 in reply to Vivek Thakur
    TI__Mastermind 28005 points

    Hello,

    Welcome to the E2E forums, and thanks for your interest in our DLP technology. I've personally reproduced the steps detailed in this tutorial, and also encountered the problem you have shown above.

    You are correct that the issue is related to the video signal. Namely, you are encountering signal noise and distortion due to the jumpers you are using. You do not need to modify any settings on your Raspberry Pi or DLP2000 EVM to fix this, but you do need to make some hardware modifications. There are a few ways you can fix this:

    > Rewire the connections between the EVM and Raspberry Pi, using shorter jumpers. It is important that video signals stay close together to prevent timing issues. If possible, try bundling the wires together instead of keeping them loose.

    > Create or print a custom PCB to use as an interface. This costs more but ensures a clean signal. An example implementation for this can be found at https://www.tindie.com/products/mickmake/pi-projector/

    In short, you need to improve the connections between your EVM and Raspberry Pi. I hope this helps.

    Best Regards,

    Philippe Dollo