mm9z1_638 can_h and can_l abnormal waveform

Thanks for reaching out and sharing the details. Abnormal waveforms on CAN_H and CAN_L, along with error frames, could indicate a few potential issues. Common causes include grounding issues, incorrect termination resistance, or noise interference on the CAN bus. I’d suggest checking the termination resistors first to make sure they are 120 ohms at each end of the bus. Also, confirm that the CAN ground is properly connected across all nodes and that there are no loose connections.

If those basics check out, there might be interference or an issue with one of the nodes overloading the bus. A good next step is to isolate each node one by one to see if the error disappears.

Feel free to send me an email if you’d like to go into more detail—I’d be happy to help troubleshoot further.