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DLPC350: Display patterns at 2880Hz does not work

Gary Tendon
Prodigy 20 points
Part Number: DLPC350
Other Parts Discussed in Thread: DLPLCR4500EVM

Hello

I need to display a 2880Hz video (120Hz x 24 bits x 1-bit pattern) with the DLP LightCrafter 4500 development module (DLPLCR4500EVM) and its DLPC350 controller. The video to be displayed is generated with an external FPGA.

My problem is that nothing is displayed after the configuration is done.

The validate command does not return any error (value is 0x00).

The input signal is 1140x912 (I also tried 912x1140) @ 120Hz on the 24bits port with a 149MHz pixel clock.

Do you have any suggestion or idea to help me solve this problem?

Thank you.

 

The controller is configured via I2C  as below but I tried multiple other configurations:

Register : 0x69; // Display Mode Selection Command
Value : 0x01; // 1 = Pattern display mode

Register : 0x6F; // Pattern Display Data Input Source
Value : 0x00; // 0 = Pattern display data streams through the 24-bit RGB/FPD-link interface

Register : 0x75; // 0x75 Pattern Display LUT Control
Value (byte 0): 0x00;
Value (byte 1): 0x01;
Value (byte 2): 0x17;
Value (byte 3): 0x00;

Register : 0x70; // Pattern Trigger Mode Selection
Value : 0x00; //0 = Pattern Trigger Mode 0: VSYNC triggers the pattern display sequence

Register : 0x66; // Pattern Exposure Time and Frame Period
Value (byte 0): 0x8D; //Exposure =8.3ms
Value (byte 1): 0x20;
Value (byte 2): 0x00;
Value (byte 3): 0x00;
Value (byte 4): 0x8D; //Period = 8.3ms
Value (byte 5): 0x20;
Value (byte 6): 0x00;
Value (byte 7): 0x00;

Register : 0x77; // Open mailbox (Pattern Display LUT Access Control)
Value : 0x01;

Register : 0x76; // Pattern Display LUT Offset Pointer
Value : 0x00;

Register : 0x78; // Pattern Display LUT Data
Value (byte 0): 0x61; // Internal trigger + 24 patterns
Value (byte 1): 0x71;
Value (byte 2): 0x04;

Register : 0x77; // Close mailbox (Pattern Display LUT Access Control)
Value : 0x00;

Register : 0x7D; // 0x7D Validate Data Command Response
Value : 0x00;
+ Read 0x7D

Register : 0x65; // 0x65 is Pattern Display Start/Stop Pattern Sequence
Value : 0x02; // 0b10 = Start pattern display sequence

  • 0
    TI__Expert 7060 points

    Hello Gary,

    Welcome to the E2E forums and we hope to assist you with your questions. 

    The DLPLCR4500EVM normally displays something correctly on power up with no issue?

    Please give us some time to look into this issue and we will get back to you as soon as possible. 

    Thanks,

    Alex Chan

  • 0 in reply to Alexander Chan
    Prodigy 20 points

    I confirm that the DLPLCR4500EVM normally displays something correctly on power up with no issue (before I try to go in pattern display mode). In standard video mode, everything is working fine.

  • 0 in reply to Gary Tendon
    TI__Expert 7060 points

    Hi Gary,

    Thanks for your response will look into this issue thanks for your patience.

    One thing you could try I know it may look a little different from your application but could you try the example command lists from table 4-3 or table 4-4 from the dlpc350 programmers guide see if those at least work as a baseline?

    Thanks,

    Alex Chan