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TIDA-01473: DLP LCD2000 EVM communication using USB to i2c

Ben Yang1
Prodigy 30 points
Part Number: TIDA-01473

For DLP LCD2000 EVM, can I directly use "USB to IIC" and assistant tools on the computer to directly read and write registers? If yes, how?

----------------------------

When writing, 36 0E 00000001 is sent

When reading, send 36 15 0B first, then read 37 address 4 bytes

----------------------------

There is no phenomenon when writing, only “FF FF FF FF” when reading

  • 0
    TI__Mastermind 30875 points

    Hi Ben,

    As long as you are following I2C communication protocol specified for the device https://www.ti.com/lit/ug/dlpu013a/dlpu013a.pdf Section 2.2 I2C Interface you should be able to use the device. You may need to be careful about the I2C bus voltages and pull-ups.

    Regards,

    Sanjeev

  • 0 in reply to Sanjeev
    Prodigy 30 points

    Thank you for your reply!

    Here is some waves in Signal Tap when I tried to wirte via FPGA I2C

    -------------------------------------------------------------------------------------------------------------------------------------

    Write 36 0B 00 00 00 01，but when write 0B, no ACK

    -------------------------------------------------------------------------------------------------------------------------------------

    Write 36 0E 00 00 00 01，but when write the last byte, no ACK


    -------------------------------------------------------------------------------------------------------------------------------------

    I write command after the EVM powered and displaying normally. Is there any details I missed?

  • 0 in reply to Ben Yang1
    TI__Genius 9971 points

    Ben,

    We will look into your queries and get back to you soon.

    Thanks and regards,

    Mayank

  • 0 in reply to Ben Yang1
    TI__Expert 3360 points

    Hi Ben Yang,

    Ensure that you are connected to the correct I2C bus of the EVM by referencing section 3.2 of the user's guide. The pins of interest are pins #19 and #20 on P2 (SCL and SDA, respectively). Also, is your clock rate 100 kHz ? What voltage level are these commands being sent at ?

    Thank you,

    Chris

  • 0 in reply to Cody Smith
    Prodigy 30 points

    Thank you, Chris!

     

    I did make a mistake about the pin connection. My coworker reminded me that I had not connect the ground together between my FPGA and EVM. Now I can send comends to EVM. 

    --------------------------------------------------------------------------------------------------

    The clock rate is 100kHz, and the voltage level is 3.3-V LVTTL. Is the voltage level ok with EVM?

  • 0 in reply to Ben Yang1
    TI__Mastermind 28005 points

    Ben,

    Thanks for your feedback. I will mark this issue as resolved.