CAN bus sniffer with MPC56xx?

[borjagomez]

Dear Sir/Madam:

I have to configure the FlexCAN module to work as a CAN bus sniffer or in normal mode (with msg Id related to a message buffer). I have no problem to run the FlexCAN module when Message Id are known and hence, they are linked to a message buffer, but I would like to know if this module can be configured for the reception of unknown message identifiers. In this case, the CAN module should work as a gateway. It just sends what it has received. Is this possible?

Thank you in advance,

Borja Gómez

[PetrS · Accepted solution]

Hi,

You could just set a mask acceptance register(s) properly, means clear all bits. In that case the received ID is “don’t care”. If you want to receive both standard and extended frames then 2 MBs should be set for receive, one for standard and other for extended frames.

Regards,

Petr

[borjagomez]

Thank you very much.

Borja.