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• Method 1

  • Configure your CAN controller to *NOT* assert the hardware acknowledge.

  • Connect at one speed and listen .

  • If you see CAN errors, switch to the other speed.

  • If you see no CAN errors, reconfigure to enable hardware acknowledge.

• Method 2 → Will be attempting this method

  • Most CAN transceivers have a pin that can put the chip into a listen only mode.

  • Wire that pin to a micro pin.

  • Configure the transceiver for listen only.

  • Configure CAN for one speed and listen.

  • If you see CAN errors, switch to the other speed.

  • If you see no CAN errors, toggle the pin to the CAN transceiver to enable the full mode.

• Method 3

  • If the CAN Rx pin on the micro could be configured to grab a hardware timestamp, measure the time of CAN pulses.

  • It would need to capture many, to ensure it found the smallest pulse.

  • Compute the bit-rate and configure the CAN controller.

Questions

• What hardware is the CAN bus connected to?

• Does method 2 seem feasible?