Stm32g474re-nucleo FDCAN internal loop not working

Forum|Forum|6 months ago
March 13, 2026
4 replies
295 views

Hi, I have all configured using internal loop FDCAN1 and there is not working on my STM32G474RE-Nucleo board

Screenshot 2026-03-13 194621.png

STM32G4 series

Best answer by mƎALLEm

Hello,

"Not working" does mean nothing. What problem you are facing? in transmit? in receive?

Try to use external loopback mode and monitor FDCAN_Tx pin.

I am not comfortable with setting 1Tq to the time segments. Here you are setting 1Tq for TSEG2:

Try to set NTSEG1 = 17TQ and NTSEG2=2TQ

TDK

What does "not working" mean here?

How to write your question to maximize your chance... - STMicroelectronics Community

"If you feel a post has answered your question, please click ""Accept as Solution""."

mƎALLEmBest answer

ST Technical Moderator

Hello,

"Not working" does mean nothing. What problem you are facing? in transmit? in receive?

Try to use external loopback mode and monitor FDCAN_Tx pin.

I am not comfortable with setting 1Tq to the time segments. Here you are setting 1Tq for TSEG2:

Try to set NTSEG1 = 17TQ and NTSEG2=2TQ

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.

Karl Yamashita

Principal

Upload your IOC file. Also show some code. We don't know if you configured the filters correctly and if you even started the CAN controller with interrupts.

If a reply has proven helpful, click on Accept as Solution so that it'll show at top of the post.CAN Jammer an open source CAN bus hacking toolCANableV3 Open Source

mƎALLEm

ST Technical Moderator

Hello,

Could you please state on this thread?

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.

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