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How to test CAN of TMS570LS3137

Jiaming Sun
Expert 1300 points
Other Parts Discussed in Thread: TMS570LS3137, HALCOGEN

I don't connect the can interface of TMS570LS3137 to any device ,how can I test the can interface ,I want to measure the signal of the Tx of CAN interface ,how can I do this test ?

  • 0
    Mastermind 7585 points

    Well, you can use a CAN-Analyzer to monitor the data traffic on your CAN - LInes CAN_H and CAN_L. However, this will run only for a short time becauseof missing ACKs. For a proper test you will need a 2nd node to produce the correct ACK. This is all basic CAN stuff and not directly related to TMS570.

     

  • 0
    TI__Guru 59540 points

    Jiaming,

    I agree with Frank's inputs but would also like to add that you will need a CAN transciever chip connected to the TMS570 device before going to the wider CAN bus. If you are using an HDK, there is already a CAN transceiver on the board, but if you are using a prototype or EVM of some kind, you will need to add this.

  • 0 in reply to Chuck Davenport
    Expert 1300 points

    I connect can2 of TMS570LS3137 with other can device,  first picture is the TX signal of can2 of TMS570LS3137, it dose not work correctly ,second picture is the signal measured from the RX pin of CAN2 of TMS570LS3137 ,it seems good.

    I think I didn't configure the can module correctly , I use the example of HALCOGEN,

    Could you give me other example code ?

     

  • 0 in reply to Jiaming Sun
    Expert 1300 points

    The problem is solved now,because the TX pin of iCoupler is not soldered well .So the output of TX can't send out.

    But I want to know why it shows this kind signal ,what does it mean?

  • 0 in reply to Jiaming Sun
    TI__Guru 59540 points

    Hello Jiaming,

    Unfortunately, neither I nor our experts can provide a definitive explanation for the wave form you saw when there was not a suffient solder joint. I can only speculate that perhaps there was some combination of intermittent, high impedance or broken connectivity resulting in an unspecified signal state. Now that everything is working as you expect, is there still any concern of what you were seeing previously?