MCXN947 CanBus Rx Stop Receiving

stevenlutz — Sun, 19 Jan 2025 01:37:19 GMT

I have the following block of code to receive Can Messages, however I usually only get 1 or 2 times through the while loop before the program hangs in the /* Wait until Rx MB full. */ loop.
I also want to filter to only receive NMEA2000 PGN 1F805, but am using my test ID of rxIdentifier = 0xDF80502; for now which is being sent from a separate test device on the can network.

I must be missing a step to clear the buffer?

while (true)
{
/* Start receive data through Rx Message Buffer. */
rxXfer.mbIdx = (uint8_t)RX_MESSAGE_BUFFER_NUM;

rxXfer.frame = &frame;
(void)FLEXCAN_TransferReceiveNonBlocking(EXAMPLE_CAN, &flexcanHandle, &rxXfer);

/* Wait until Rx MB full. */
while (!rxComplete)
{
};
rxComplete = false;

LOG_INFO("Rx MB ID: 0x%3x, Rx MB data: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, Time stamp: %d\r\n", frame.id >> CAN_ID_EXT_SHIFT, frame.dataByte0, frame.dataByte1, frame.dataByte2, frame.dataByte3, frame.dataByte4, frame.dataByte5, frame.dataByte6, frame.dataByte7, frame.timestamp);
}

This is the only masking mechanism I see, how can I set the proper mask for matching specific part of a CAN ID?

/* Set Rx Masking mechanism. */

FLEXCAN_SetRxMbGlobalMask(EXAMPLE_CAN, FLEXCAN_RX_MB_EXT_MASK(rxIdentifier, 1, 0));

Re: MCXN947 CanBus Rx Stop Receiving

stevenlutz — Tue, 21 Jan 2025 08:04:37 GMT

I believe this issue to due to a misconfigured TJA1152 CAN Tranciever. NDA required for documentation.

Re: MCXN947 CanBus Rx Stop Receiving

Alice_Yang — Wed, 22 Jan 2025 08:19:39 GMT

Hello @stevenlutz

It seems that the issue is related to your private ticket. I have replied to you on that ticket. Please contact me if you still have any issues.

Alice

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MCXN947 CanBus Rx Stop Receiving

Re: MCXN947 CanBus Rx Stop Receiving

Re: MCXN947 CanBus Rx Stop Receiving