Programming STM32U031C8U6 with ST-LinkV3

[MaxBrt]

Good morning,
I would like to request support regarding the programming and debugging of the STM32U031C8U6 microcontroller. It is mounted on a custom-designed board, and I am experiencing issues connecting to the microcontroller via SWD for programming and/or debugging using an ST-LinkV3 updated to the latest version (V3.J16.M8.B5.S1), with STM32CubeProgrammer and STM32CubeIDE. The microcontroller is never detected.
Note: With the ST-LinkV2 programmer, I am able to perform both programming and debugging without issues using the same software tools.

 

Many thanks in advance to anyone who can help me!

[Pavel A.]

Have you connected the target voltage pin?  ST-LinkV3 needs it.

 

[mƎALLEm]

Hello @MaxBrt and welcome to the community,

You need to share the schematic so others can help you efficiently.

Thank you

[Andrew Neil]

Welcome to the forum.

For best results, please see How to write your question to maximize your chances to find a solution.

 

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@MaxBrt wrote:

 It is mounted on a custom-designed board,

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So, as @mƎALLEm said, you need to supply full details of the board - in particular, the schematics.

Also show how the ST-Link is connected.

Some good, clear photos of your setup would also help.

 

Some Knowledge Base articles on debugger connection issues:

How to solve connection errors when connecting and programming the STM32 target board.

How to solve debugger connection issues

[TDK]

Show a picture of the setup, showing connecting between chip and programmer.

Ensure the board is powered. The programmer generally does not provide this.

Show a picture of STM32CubeProgrammer screen when it fails to detect the chip.

[MaxBrt]

Thank you all,

I found the problem!!. Basically, if I use the JTAG20 header on the V2 and connect only the SWD pins, it works correctly. However, if I connect the same pins on the V3, it doesn’t work. Instead, it works when I connect the board using the SWD header pins.

I thought they were the same thing, but clearly I was wrong.

[Andrew Neil]

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@MaxBrt wrote:

I found the problem!!.

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Great - thanks for feeding back.

Now please mark your post as the solution:

https://community.st.com/t5/community-guidelines/help-others-to-solve-their-issues/ta-p/575256