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AWR1843: CAN-FD transmit

geuntae lim
Prodigy 10 points
Part Number: AWR1843

Tool/software:

“Hi, I use the AWR1843 to transfer data via CAN-FD. In this case, I’ve observed data loss in lower-priority messages based on PCAN Log analysis.

Does CANFD_transmitData check the node’s idle state and wa it before transmitting?

(id 400, Transfer period :100ms 

  • 0
    TI__Intellectual 1371 points

    Hi,

    Could you provide some more information:

    • Are you using the Medium Range Radar demo in the Radar Toolbox, or a custom demo? Is this on a TI EVM or custom board?
    • To confirm, the behavior you are seeing is that the CAN messages with ID=400 are losing data? Are you seeing any data? 
    • Are you seeing any values in the MCAN_ECR register? 
    • What is the periodicity of the CAN-FD message?

    Regarding your question, yes the CANFD checks that the bus is free before attempting to transmit again. Lower priority messages that lose arbitration should continue retransmitting when the bus is free, unless configured not to. 

    Thank you,

    Jin

  • 0 in reply to Jin Lee
    Prodigy 10 points

    I checked the retransmission configuration in the MRR demo

    mcanCfgParams.darEnable                             = 0x1U;

    thank you best regards

  • 0 in reply to geuntae lim
    TI__Intellectual 1371 points

    Hi Geuntae, 

    Automatic retransmission is currently disabled. Could you try setting darEnable = 0? 

    From canfd.h:

    /*! Disable Automatic Retransmission
         *   0 = Automatic retransmission of messages not transmitted successfully
         *       enabled
         *   1 = Automatic retransmission disabled
    */
     
    Could you also provide some more information on the other questions above?
    Thank you,
    Jin
  • 0 in reply to Jin Lee
    Prodigy 10 points

    setting darEnable = 0. It fixed the problem.

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

    I used Toolbox MRR Demo on Custom Board.

    Track data of 3 Radars are received at 200, 300, and 400 respectively.

    CAN FD bit rate: 5M bps

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

    Thank you

  • 0 in reply to geuntae lim
    TI__Intellectual 1371 points

    Hi Geuntae,

    Glad to hear the problem was fixed! I'll close this thread. 

    Please submit another post if you run into any further issues.

    Thank you,

    Jin