Can't connect to the MCU via STLinkV2 [ST-LINK error (DEV_CONNECT_ERR)]

Forum|Forum|1 year ago
February 3, 2025
7 replies
3425 views

I have made a PCB with the STM32C011F6P6 on it and am trying to program it via an ST-LinkV2. While trying it out yesterday, it connected just fine with the cube programmer. Now I am trying to do the same thing again, but both the cube programmer and the cube ide tell me that they can't connect.

I have already upgraded the firmware via "stsw-link004".

Does someone have an idea what might be causing this?

Schematic of my MCU wiring:

STM32C0 series

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Best answer by DavidL_

There was an issue with the power supply that causes the errors. Fixed that and it worked just fine.

STTwo-32

ST Technical Moderator

Hello @DavidL_

First, stsw-link004 is obsolete. So, please make sure to use the STM32CubeProgrammer last version (V2.18.0).

Also, could you please share a picture of your ST-Link. It may be a Clone. More details on this article: How to recognize a genuine ST-LINK/V2 versus a clo... - STMicroelectronics Community

Best Regards.

STTwo-32

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.

D

DavidL_Author

Associate III

I don't have access to an original one, the one I have access to is this:

STTwo-32

ST Technical Moderator

Unfortunately, we can't guarantee anything about a Clone ST-Link. So, I suggest you command a new genuine one if you are looking for good working performance.

Best Regards.

STTwo-32

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.