Trouble connecting STM32 with ST Link V3

[Powablocks]

Hello,

I currently working on a projet where I've ordered custom PCB with STM32F030C8T6 already installed by JLCPCB but I can't communicate with them.

I've connected the STM32 with 3.3V and ground and then I output the SWD and SWCLK pins. I connect the GND, SWD and SWCLK to the daughter board of STLINK to port CN6 on CLK, GND et DIO.

But when I connect the ST LINK to my computer the LED go red and I have a Fails.txt with "The interface firmware FAILED to reset/halt the target MCU"

Does someone know what I've done wrong or where can I found a solution. I've already searched on internet and I tried to put the Nrst pin to nrst of st link without succes and also boot to vcc or gnd but also wihtout success.

[Tesla DeLorean]

Start with a review of the schematic, and the orientation of the part.

I've posted diagnostic check lists to the forum in the past.​

[Powablocks]

I could'nt find tyou diagnostic check list, the forum is not easy to search could you share the link please ?

Also, I've checked the schematics, the power is well connected as you can see here :

The SWD and SWCLK are connected to an external connector :

Then I have the power from a power supply with 3.3V.

I've connected this way to the ST Link :

Red : 3.3V

Green : SWCLK

Black : Ground

Blue : SWD

As for the software I'm using STM32CubeProgrammer

Here is the config and you can see the 3.3V is read :

And when I press connect I've got this message : What can I try ?

[Tesla DeLorean]

>>What can I try ?

Try a lower connection rate, 24 MHz is typically too high for CM0(+) devices, start with 2 MHz

Typically SWCLK,SWDIO and NRST are suggested.

A device that is not electrically functional will not respond.

Check NRST is normally HIGH, pulled-up internally

Check power on VDD/VDDA

Check part orientation

Check pin assignments and netlist

BOOT0 is typically pulled LOW externally so the part runs User Code properly out of reset.

[S.Ma]

Try to disconnect external oscin and osc out, check the package pin 1 is correct, maybe top or bottom view confusion... happens for connectors too. Sanity check.

[Uwe Bonnes]

24 Mhz rate with wire jumpers is challanging.