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February 3, 2026
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GD32F407VET6: JLink debugging faults after 30 seconds

  • February 3, 2026
  • 2 replies
  • 291 views

Title edited - part number added (not an ST part)


After commencing debugging with the JLink, these faults persistently occur after approximately 30 seconds. However, this JLink functions correctly when debugging IAR. What might be the cause?

The actual chip used is the STM32F407VET6.

JLink keeps disconnecting from CubeIDE for some reason. Debugging frequency SWD=500k

The ST Community moderator has edited the post to comply with the forum language guidelines. The language of the Community is English. For more information, see: ST Community Terms and Conditions

Best answer by Peter BENSCH

Welcome @cgc, to the community!

If, as shown in your schematics, the GD32F407VET6 is used, you should ask its manufacturer Gigadevice.

Regards
/Peter

2 replies

cgcAuthor
Associate
February 3, 2026

cgc_0-1770101536457.png

The schematic diagram is as follows:

mƎALLEm
Technical Moderator
February 3, 2026

Hello @cgc and welcome to the ST community,

You can start by checking your JTAG hardware part by inspiring from one of ST Eval boards (Example: STM3240G-EVAL:(

mALLEm_0-1770109366119.png

"To give better visibility on the answered topics, please click on ""Accept as Solution"" on the reply which solved your issue or answered your question."
Peter BENSCH
Peter BENSCHBest answer
Technical Moderator
February 3, 2026

Welcome @cgc, to the community!

If, as shown in your schematics, the GD32F407VET6 is used, you should ask its manufacturer Gigadevice.

Regards
/Peter

mƎALLEm
Technical Moderator
February 3, 2026

@Peter BENSCH wrote:

Welcome @cgc, to the community!

If, as shown in your schematics, the GD32F407VET6 is used, you should ask its manufacturer Gigadevice.

Regards
/Peter


Nice catch.. I didn't see it ;)

mALLEm_0-1770110055424.png

 

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