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Possible H/W error in s32k148 flexcan controller

Question asked by Freddy Ben-Zeev on Mar 6, 2019
Latest reply on Jun 3, 2019 by Freddy Ben-Zeev

I'm running an evaluation with CAN configured for FD at 1Mbps for arbitration phase and 2Mbps data phase. I'm generating traffic from PCAN-View on a PCN-USB X6 with 16 bytes data at 1msec intervals (at this rate some messages are dropped). Inside the IRQ handler it reads from the mailbox a DLC of 0 instead of 0xA, which I caught by adding an assert at that point. If during the assert I look at the MB register again it contains a correct value of 0xA.


Looks like the interrupt happens before the mailbox is up to date.