S32K312 CAN

chenyh

怎么能让can不自动恢复？无论我勾选与否，CAN出现故障后都会自动恢复，因为我需要检测到故障后，手动去恢复can通信，有人能提供解决办法吗？

Julián_AragónM

You can try reading bit BOFFREC from the CTRL1 register to confirm if bus off recovery is disabled.

You can also monitor FlexCAN_Ip_MainFunctionBusOff_Privileged function, since it is in charge of clearing the BusOff Status Flag.

Best regards,
Julián

chenyh

Hi!@ Julián_AragónM

我看 Base->CTRL1的数值，确实在我未勾选的时候bit=1，勾选的时候bit=0，但是出现busoff后，仍然会自动恢复。我不知道该怎么解释

Julián_AragónM

Hi @chenyh

Please try to manually write 1 to BOFFREC. The module should remain in BusOff until you write 1. Keep in mind that if a CAN node does not send any messages, it will not enter a "bus-off" state.

Aa node only enters bus-off when its error counter exceeds a certain threshold, usually due to detecting transmission errors on the bus while attempting to send or receive messages, not just by not sending any data at all.

Best regards,
Julián