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

[DavidL_]

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:

 

[STTwo-32]

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First, stsw-link004 is obsolete.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

 

[DavidL_]

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

 

[STTwo-32]

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

[AScha.3]

in CubeProgrammer:

set mode: normal

+ reset: software reset

-- then try again + show result.

++

put a cap (100nF) on rst to GND !

[DavidL_]

 Seems to be the same error.

[AScha.3]

But still pic shows hw reset:

++

on CPU: put a cap (100nF) on rst to GND !!!!!!!

[DavidL_]

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