FDCAN2 doesn't seem to work with STM32G474e-EVAL board

[ESchn.1]

I'm having problems getting my software to work with FDCAN2 on the STM32G474e-EVAL board. It works with FDCAN1, but w/ FDCAN2, messages accumulate in the Tx buffer until I get buffer fill errors.

I built the FDCAN_Com_IT example from the latest STM32GCube firmware bundle and it fails in the exact same manner. Board is terminated correctly and I believe the CAN pins are wired to each other correctly. What could be going wrong here? Thanks.

-es

[ESchn.1 · Accepted solution]

Ok, finally tracked this problem down. It would appear that some revisions of the STM32G474E-EVAL board default to having the FDCAN2 TX pin disconnected. If you solder the SB5 location on the board closed, the pin will be connected and FDCAN2 will work.

[KDJEM.1]

Hello @ESchn.1 ,

Glad to know that the issue is already fixed.

Thank you for your sharing the solution 🙂.

Yes, you are right the FDCAN2 TX is initially disconnected in G474EMC-B04 Board revision, SB5 is open by default, contrary to G474E-B04 Board revision 

 Thank you for your contribution in STCommunity. 

 Kaouthar