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I2C write problem in DLPC350.

RY9983
Guru 10570 points
Other Parts Discussed in Thread: DLPC350

Hello.

I am evaluating LightCrafter4500 using I2C command from external micon.
I have not been able to write value to every registers.
Although I measured waveform by logic analyser, I can not find my problem.
Could you point out my problem?

Best regards, RY

The following diagram is case of sending "Display Mode Selection Command (I2C: 0x69)" to DLPC350 from MDU.

  • 0
    TI__Expert 4720 points

    Hello RY,

    Could you clarify your problem for me. Are you having problems writing to specific registers or any register in general?

    Best regards,

    Blair

  • 0 in reply to Blair Conner
    Guru 10570 points

    Blair-san,
    Thank you for your response.
    I can not write all registers(0x0-0x7F) in DLPC350.

    - When I configured from GUI, I can read its change correctly with I2C read.
    - DLPC350 firmware version is v1.1.0.

    Do you have any idea?
    Best regards, RY

  • 0 in reply to RY9983
    TI__Expert 4720 points

    Hello RY,

    Could you clarify the first byte in your image for me. You have 1AW listed. In your setup what is the W. Is it a single bit?

    Please verify that your system sends the first byte for a write command as 0x35.

    Best regards,

    Blair

  • 0 in reply to Blair Conner
    Guru 10570 points

    Blair-san,

    Thank you for your comment.

    Blair Conner said:

    Could you clarify the first byte in your image for me. You have 1AW listed. In your setup what is the W. Is it a single bit?

    Please verify that your system sends the first byte for a write command as 0x35.

    First of all, write command is 0x34, isn't it ?
    dlpu010b (P7)
    Yes. First byte is a single bit.
    I re-attach the write sequence with scale up and add I2C1_SDA value with yellow color.
    'A' means 'Ack'.
    Are there anything strange?
    Best regards, RY
  • 0 in reply to RY9983
    Guru 10570 points

    Blair-san,

    Hello.
    I would like to report my examination.

    exam1) I configure DLPC350 by GUI, and read back register value by MCU I2C.
    ---> It was successful.

    exam2) I configure DLPC350 by MCU I2C, and read back register value by MCU I2C.
    ---> I could not read expected value.

    exam3) I configure DLPC350 by MCU I2C, and read back register value by GUI "Get" button.
    ---> I could not see expected result on GUI. (I could not see the check on GUI check box.)

    Therefore, I think my I2C Read Transaction have been successful.  But, I2C Write Transaction is fail.
    If you have any idea, please let me know.

    Best regards, RY

  • 0 in reply to RY9983
    Guru 10570 points

    Blair-san,

    I was successful to Write Transaction through I2C.
    When I use the Display Mode Selection Command(I2C: 0x69), I have to write 0x69 | 0x80 = 0xE9.

    It was posted in following link:
    http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/924/p/309183/1079077.aspx

    But, It must be described in Programmer's guide clearly.
    Could you update PG in the future?

    Best regards, RY

  • 0 in reply to RY9983
    Prodigy 20 points

    is this problem occuring on all the  Windows operating system?or only on windows 8?

  • 0 in reply to kaili kai
    Guru 10570 points

    kaili kai-san,

    Hello. This problem will occur on all the system.
    Because, there is not enough description for I2C Write Transaction Sequence in PG.

    Best regards, RY

  • 0 in reply to RY9983
    TI__Expert 4720 points

    Hello RY,

    Thank you for posting the link. I'll note that the Programmer's Guide needs to be clarified and updated.

    Best regards,

    Blair