I have just recieved this circuit board and im trying to program it with an ST-LINK V2 however i keep getting the error "no stm32 target found" when trying to connect to it through SWD. Could someone help me?

[SDowr.1]

I have just recieved this circuit board and im trying to program it with an ST-LINK V2 however i keep getting the error "no stm32 target found" when trying to connect to it through SWD. Could someone help me?

[Peter BENSCH]

Please double-check the connection of RST/TMS/TCK to the right pins at the STLINK-V2. Additionally you could try to Connect Under Reset to avoid trouble when running in low-power modes and/or not defining the SWD pins within your user program.

BTW: it is recommended not to use a pull-up (R19) a NRST, as there is already a built-in pull-ip (see RM0364, pg 105, fig. 9), so the capacitor (C12) is sufficient. NRST is a bidirectional pin and is also able to drive external circuitry when needed.

/Peter

[Tesla DeLorean]

Pin 1/2 of the ST-LINK 20-pin needs to be powered so the buffers work.

The design here forecloses several methods to do signs-of-life.

The grounding of unused pins might be an issue for the boot-loader.

You can check the state of NRST, if clamped low, then power issues.

The 10K pull-up should be inconsequential.

[SDowr.1]

Would I apply 3.3v to the reset on power up to do this? And do I have to remove the pull up resistor and jump this pads?

[SDowr.1]

I’ve only been using pin one on the ST-LINK for power, is this likely to be my issue?

[Tesla DeLorean]

I think they are connected on the ST-LINK, ARM used to use VTref / VTarget on Pin#1

Generally the error you're seeing suggests the connection is wrong, or the chip is non-functional.

Would double check the orientation of the part.

With BOOT0 pulled High one could have tried to talk to the device via USART1 on PA9/PA10, you can get a 0x79 response to a 0x7F data pattern at 9600 8E1, if the IC is functional.

The external clock is not enabled at boot.

[SDowr.1]

The components were soldered by JLCPCB and the chip is the correct orientation. What would you suggest I do?

[Tesla DeLorean]

Nothing jumping out on the schematic, but I'm not going to go through every pin/node.

Double check the orientation of the SWD-10 vs ST-LINK 20-pin connector

You're going to have to go through the schematic, pcb and docs, and cross-check everything, repeating the due-diligence.

I'd probably start with a minimally populated board, provide a supply, have the JTAG/SWD connections, and see if it responds.

If the part still isn't responsive, and you've cross checked all pins, and get an IC from Mouser/DigiKey of known provence