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Original question:

TCAN4550: TCAN4550

TCAN4550: CANFD Reception Delay

Akshay Naik
Prodigy 80 points
Part Number: TCAN4550

Hi,

We are observing an unusual delay in between the CANFD reception interrupt. We are sending data from node A with 0.1 ms interframe delay continuously to node B. We have seen that Node B is getting interrupted continuously by the reception interrupt for 1 ms then interrupts are not happening for next 41/42/43 ms. Again for the next 1 ms interrupts will happen continuously, then again no interrupts for next 42 ms.

Please see the below image. I am expecting to get a continuous interrupt from TCAN, but TCAN module is not giving interrupt to the ISR.

Could you please let us know how I can resolve this issue?

Regards,

Akshay Naik

  • 0
    TI__Mastermind 29340 points

    Hi Akshay,

    Can you monitor the value of the Interrupt Registers during this to determine what bits are set?  It is possible that other interrupts are getting set in addition to the new message interrupt that is holding the interrupt pin low and masking the new message interrupt bit from the ISR.

    Can you verify that you are able to receive and clear new messages within the time frame you are testing and avoid a RX FIFO or Buffer Overflow situation?

    Regards,

    Jonathan