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Controlling CDCM6208V2 EVM Board from TM4C123G Launchpad via I2C

Cynthia Crutchfield
Expert 1335 points

Hello!

I am attempting to communicate with the CDCM6208V2 evaluation board DIRECTLY from my Tiva Launchpad via I2C.  Is this possible?  I am using jumper wires to connect the SDA/SCL lines (I2C0, PB3/PB2) from the Launchpad directly to the clock synthesizer board.  I'm struggling to determine the prober physical connections.  I've tried several connections on the clock board without success, though through SCL_PIN4/SCI_SDA_PIN1, I did at least receive an I2C_MASTER_ERR_ADDR_ACK/I2C_MASTER_ERR_DATA_ACK from my call to I2MasterErr(I2C0_BASE), after my I2MasterControl(I2C0_BASE, I2C_MASTER_CMD_SINGLE_SEND).  Other connections have yielded a hang at while(I2CmasterBusy(I2C0_BASE)).  I can give you my complete code snippet, but I'm more concerned about the validity of my hardware connections than I am about the software.

Thanks!

Cindy

  • 0
    Expert 1335 points
    Hello! Any hope of getting any an answer on this? Should I try a different forum? Thanks!
  • 0
    Guru 47900 points

    Cynthia Crutchfield said:
    ...attempting to communicate with the CDCM6208V2 evaluation board DIRECTLY from my Tiva Launchpad via I2C

    I'm hapless outsider - not hallowed insider - yet may have (some) insight.

    Might it be that few here have absolute knowledge/awareness of that, "CDCM6208V2" chip - let alone its specialized, eval board?    How then are we to comment?    (is it wise to "expect" those here to invest (yet more) time/effort to google your part - and then the eval board - prior to composing?)

    Not my intent to "beat you up" - yet the odds of any "direct match" (here) seem small - and the lack of (any) response -  (likely) results from facts presented...   You may consider linking to that chip site and/or providing a PDF (both chip & eval board)     Again - this is reality - which (sometimes) is harsh!

    That chip may have a forum or user group - such seems "better bet" than "death valley."   (i.e. here)    Bon chance...

  • 0 in reply to cb1
    Expert 1335 points
    Thank you kindly cb1- I will see if the CDCM6208V2 forum might be more helpful. I have looked carefully at the two eval boards I'm attempting to connect, with the help of a hardware engineer. Said hardware engineer is thinking that soldering is necessary- I thought I would ask here before he attempts that. I do appreciate your feedback!
  • 0 in reply to Cynthia Crutchfield
    TI__Mastermind 22715 points
    Cynthia,

    For I2C communication to work correctly, you will need to have strong pull up resistors (~5k) on the SDA and SCL pins.

    Thanks and regards,

    Zhaohong
  • 0 in reply to Zhaohong Zhang
    Expert 1335 points
    Thank you- I'll give that a shot...