UART2 on the Nucleo G431-RB accepts data through the USB virtual port but not through PA3.

[KJase.1]

Hi all, I am working in uart2 which is connected to the usb port in nucleo -g431rb but I want to communicate not through usb but through PA2 and PA3 pins assigned to uart2 by default. Tx line work properly but Rx not. There is a good signal on PA3 input (I checked with oscilloscope) but MCU is not receiving data. I thought there was some collision with usb virtual port so I unsoldered solder bridges SB1 and SB12 - doesn't work. Rx uart2 works if I send data to usb port and not to PA3. Does anyone have any idea?

[Karl Yamashita · Accepted solution]

I am assuming you're using pin #5 and #10(ARD_A2) on CN3 connector? The ARD_A2 needs SB14 soldered bridge to complete the circuit.

[KJase.1]

Many thanks, I'll check tomorrow.

[KJase.1]

Now it works, thanks again.

[Karl Yamashita]

That is good to hear. Can you select as best answer?