USART without response when disconnect a STLink.

[Jdvasco2]

Hello everybody. I have tried to configure the output of a sensor for a display and it has worked, however, it only works when I am connected via STLink, when I feed the circuit by 3.3V or 5V, there is nothing on the output. Can someone help me?

[RetroInTheShade]

Hi!

You will need to clarify what hardware you are using.

If you are using a ST dev kit, you may need to remove the jumper on the NRST line between your target processor and the ST-link device.

cheers.

[Jdvasco2]

Sorry, I ended up not giving details of the platform. I am using an STM32f103c8(Blue Pill) with STLink V2 (STM8/STM32).