STM32WB5MMG discovery power supply

[fangdu]

I am currently working with the STM32WBMMG discovery board.Initially, I powered the board through USB STLink(CN11), and was able to download the p2pserver program. Everything works perfectly.

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But if I power this board using an external power 3.3V as the red box shows. I am no longer able to find the Bluetooth signal. I am sure the external power can provide enough current.

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Could someone please help me understand why? Thank you.

[Remy ISSALYS]

Hello,

With your configuration, the OLED display isn't powered, so maybe the initialization of the screen failed and application doesn't work as expected. You can try to supply your board using Vin pin.

Best Regards