Problem with iMX6UL flexcan stuck in Bus off state

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Problem with iMX6UL flexcan stuck in Bus off state

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Contributor I

when I made the miss wire connection of CAN bus the CAN went to bus off state and it never recovers from it. it was recovered only after power cycle. I was tried with both manual and Auto recovery settings in control register

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NXP TechSupport
NXP TechSupport

Hi sivakumar 

first may be recommended to verify the physical configuration on custom board as

flexcan is very sensitive to it.
The flexcan transmitter may not send any data because the receiver was wrongly
detecting that the bus was currently in use.
The STBY signal may be always on, keeping in low power mode the flexcan module,
therefore, it does not listen to anything. 

Flexcan module can be tested with unit tests:

doc\can\test - imx-test - i.MX Driver Test Application Software 

Best regards
igor
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