I am getting error "Error in initializing ST-LINK device. Reason: No device found on target." using STlink-V3 connected to blue pill by CN6 SWD.

DVand.1 · ‎2021-02-06

How do I connect the SWD connectors on stlink-v3 (CN6) to a stm32f104 blue pill for debugging and programming it? I am getting error "Error in initializing ST-LINK device. Reason: No device found on target." in CubeIDE 1.5.1. I want to verify my pinouts are correct and connections are correct. Any assistance would be really appreciated. I am new to this. Setting are Autostart local GDB, Debug probe = ST-LINK (ST-LINK GDB server), SWD, ST-LINK S/N was scanned and shows serial number. Enabling or disabling SWV does not fix. Type = Connect under reset.

Uwe Bonnes · ‎2021-02-06

The bluepill is probably not a STM32, but some clone. STLINKV3 denies connection to non-STM32 CPUs.

DVand.1 · ‎2021-02-08

Thank you for replying Uwe, upon further checking , i have another board from same manufacturer (came from same place as I ordered two). When I connect the 2nd one, it actually connects fine and I am able to program it. I know I have used the one I am having an issue with some time ago and was able to connect to it at that time. It could be a bad board but I am doubtful this is the problem. Is there a way to reset the blue pill to allow it to connect again?

Uwe Bonnes · ‎2021-02-09

Connect under reset, with reset actually connected, should connect under all circumstances with an actual STM32 device.

DVand.1 · ‎2021-02-10

Thank you. Would you be able to provide to me the actual wiring connections then between the STLink-V3 CN6 pins and the bluepill? Would that be the NRST pin needs to be connected? Sorry I am kinda new to this and trying to learn.

Uwe Bonnes · ‎2021-02-10

Decipher it yourself and try. if it does not work, document your findings and ask again.