Writing a program to the controller

[Sasha2]

Hi). I made a minimal design for STM32WB55 on board. This board has 3 program pads. There ara GND, SWDIO, SWCLK. Сontroller current is 11mA at the factory program. I try to flash the controller using these contacts, but nothing works. I use ST_LINK (STM32F407 discovery) and ST_LINK Utility. How i can flash this controller?

Hi !

How about 4 contact: Vdd ?

Regards,

Vyacheslav.

[Sasha2]

thanks for the answer Vyacheslav

I feed the controller from the li-ion battery through the LDO (3V3)

Sasha, Vdd is needed in order for the stlink to know that the controller is working, such as Vref. In other words: : the voltage does not go to the controller but from it.

"The power supply from the application board is connected to the ST-LINK to ensure signal compatibility between both boards."

Best,

Vyacheslav.

[Tesla DeLorean]

The stand-alone ST-LINK needs it's buffer powered by the Target, the one on the F407-DISCO doesn't

Check VDDA supply. Check state of NRST pin. Check part orientation.

[Sasha2]

Thanks Vyacheslav, I'll try this.

[Sasha2]

sorry Vyacheslav, do you speak Russian or Ukrainian?

Yes, I answered in "My messages".

[Sasha2]

Thank you all for your help. Problem resolved. I used USB st_link programmer and all is worked. ST_LINK in STM32F407 Discovery did not support the controller as I understand.

[Ozone]

You might try to update the firmware of the onboard ST-Link on the F407-Discovery as well.