AnsweredAssumed Answered

How to stop FlexCan "CAN_RX_MSG_BUFFER_OVERRUN", message rate to high, how to select just one message every 100ms

Question asked by Robert Lewis on Oct 30, 2015
Latest reply on Nov 4, 2015 by Daniel Chen

We are using a k20dx256 with the FlexCan controllers.


The test code works fine from MQX between two of our boards, when I attach a third node and try to read the messages I get an error, CAN_RX_MSG_BUFFER_OVERRUN.


In looking at the sending node I can see it is dumping messages on the bus at about 1k/sec. The first message is received correctly and then all others get the overrun error. I think the data is invalid in the mailbox because of the overrun error. It does not change and should be changing.

I don't have control over the sender of the messages, so I would like to read messages at the rate of 10/sec instead of 1000/sec. But I am not sure how to do this or the best practice. Should I turn off interrupts and is there then a polling mechanism, or should I disable and re-enable the interrupts based on a timer for a single message.


I am trying to learn the basics of FlexCan so any help would be very welcome.