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DLPLCR4500EVM: Help setting up the bitmap streaming through the HDMI interface

Larry Sanders
Prodigy 130 points
Part Number: DLPLCR4500EVM

Support Path: /Tools & software/Help find tools and software/Design Kits / Evaluation Modules / Boards/

Hello,

My name is Larry Sanders and I'm working with the University of Dayton. I have a project doing something similar to edge detection where I'm display the negative image using the 4500 EVM. I want to use the bit streaming method (I believe it achieves 120 Hz) to display the negative, binary image. I have the GUI source code, but I'm having trouble parcing through it to get the info I need. Could someone point out the following for me:

-What general setup needs to be performed?

-How do I enable the bitmap streaming?

-How do I load a new bitmap to be streamed?

Again, if someone could point these out in the source code or provide examples I would greatly appreciate it.

Thank you,

-Larry Sanders

  • 0
    TI__Mastermind 30600 points
    Hi Larry,

    I think what you are looking to do should be straightforward. The Lightcrafter 4500 has a mini-HDMI port which should allow you to stream the bit planes.

    Have you looked at the Lightcrafter 4500 user's guide? If not, I would recommend reading that and getting familiar with the GUI before digging into the source code. www.ti.com/.../dlpu011e.pdf

    You'll want to look at pattern sequence modes with the input source being "video port"

    Best,
    -Paul
  • 0 in reply to Paul Goedeke
    Prodigy 130 points
    Paul,

    Thank you for the quick response. Just to be clear I have a c/c++ application I've been working on for a while now that needs to interface with the projector. I already have a bitmap scale-able to the correct resolution needed. The bit map is updated approximately every 8 ms. My main question is how do I connect the bitmap to the sequence? It's not clear in the user guide how to do so. It seems like there is a buffer of bit planes of some depth that repeat. Do I need to load in a whole sequence (i.e. several frames worth)? Can I just load in the current bitmap and play?

    Thank you,
    -Larry
  • 0 in reply to Paul Goedeke
    Prodigy 130 points

    Paul,

    I've been trying to use the provided GUI to test the pattern sequence modes. I have a question and an issue:

    -Suppose my pattern sequence settings are valid, can I test the pattern sequence just using my computer? Like with a second screen?

    -Currently, after I've validated the sequence and press play, the projector appears to reboot and the GUI stops working (as in "Gui.exe has stopped working"). I am connected to system.

    I've been setting up the pattern as follows:

    -I've set the pattern source to video port, trigger mode to Vsync. Both pattern exposure and pattern period are set to 10000 us. The color is set to white and my bit depth is 8. I select my pattern as G:0-7, R:0-7, and B:0-7. I have selected pattern sequence mode under "operating mode". I have not changed any trigger controls and the output resolution is selected to be 912 x 1140 (C x R).

    Thank you for your help,

    -Larry

  • 0 in reply to Larry Sanders
    TI__Mastermind 30600 points
    Hi Larry,

    To tie your changing bit maps to the output of the Lightcrafter using pattern sequences, you'll need to have your video source provide a VSYNC pulse every 8ms (125Hz) and set up a pattern sequence which pulls whichever bitplanes you're interested in. Each time a VSYNC is received, the system will start the pattern sequence over. No need to worry about the internal buffer configuration in this case.

    You can test your system using just your computer as a second screen.

    As far as the GUI crashing, that is strange. Are you using the latest version of the GUI and the firmware?

    Your pattern configuration looks fine to me.

    -Paul