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CCS/TMS570LC4357: TCAN4550 TX SIGNAL REPEAT?

Part Number: TMS570LC4357TCAN4550-Q1
Other Parts Discussed in Thread: TCAN4550-Q1, , TCAN4550

Tool/software: Code Composer Studio

Hi

We are testing to receive and transmit canfd signals with tcan4550-q1 using spi.
However, we confirmed that the tx signal came out. But there was a problem.

It is a problem that the signal to be transmitted comes out repeatedly rather than once.

I thought that the signal was only going to come out once,

I am constantly disturbed by the signal. I'm going to put up a picture that I captured with an oscilloscope because I'm too short to write it.

Does the tx signal stop transmitting the rx signal?

I will draw a picture of how to do the test. Please refer to it.

1. Why does tx signal continue to be repeated, not once?

2. What happens to the memory area of ​​the rx buffer in mram? rx fifo There is information of 0,1,

    The rx buffer is not listed, so I ask.

  • Hello ricky,
    I am not sure that I am fully understanding your question. My understanding is you are using TMS570LC4357 which is using SPI to send data to TCAN4550 transceiver. After that you are trying to capture CAN bus with oscilloscope but signal is not visualized on the scope? Am I right?

    Best regards,
    Miro
  • Hello ricky,
    When CAN node transmits message and no ACK is recognized then transmitter repeats this message. Every node that receives valid frame will send dominant level in ACK slot. Bit timing settings in CAN bus are very important for any CAN node. Also Termination resistors has to be connected at both sides.

    You can find more information about CAN here: www.ti.com/.../sloa101b.pdf

    Best regards,
    Miro