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E
enee
Associate
March 13, 2026
Question

Stm32g474re-nucleo FDCAN internal loop not working

  • March 13, 2026
  • 3 replies
  • 161 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

3 replies

TDK
TDK
Super User
March 13, 2026

What does "not working" mean here?

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

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mƎALLEm
mƎALLEm
Technical Moderator
March 13, 2026

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:

screenshot.png

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

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Karl Yamashita
Karl Yamashita
Principal
March 13, 2026

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
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