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How do I detect there is no CAN bus connected?

Question asked by lpcware Employee on Sep 2, 2016

If there is no CAN bus then each attempt to transmit a frame will fail and the transmit error counter will increase. The error counter can be read before and after transmission. In addition CAN controllers typically provide a range of error flags in a register which gives a reason for the transmission failure which can usually be connected to an error interrupt. Note that in this situation the error counter will stop before reading 256 and therefore the bus off state will not be entered.



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