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False Positive Acceptance with CAN Rx FIFO?

Question asked by gbrowne on Jun 7, 2018
Latest reply on Jun 12, 2018 by gbrowne

Hello.

 

One of our QA engineers picked up on false positives in the CAN message acceptance today.

 

We set a FLEXCAN_MSG_ID_STD global mask to 0x7FF (i.e. exact match) using FLEXCAN_DRV_SetRxFifoGlobalMask() - I can verify that the value of CAN0->RXFGMASK is properly set to 0x1FFC0000.

 

Then the filter is set to 0x51C using FLEXCAN_DRV_ConfigRxFifo() with FLEXCAN_RX_FIFO_ID_FORMAT_A format.

 

However, messages with a CAN ID of 0x11C are being accepted using FLEXCAN_DRV_RxFifoBlocking().  So it looks like only part of the mask is working (potentially)...

 

Any ideas what I may be missing?

 

Thanks,

 

-Greg

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