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Using UART between pc and NUCLEOL0R8

hi,

I tried to use UART_TwoBoards_ComPolling example in stm32Cube. I know that this example is for communicating between two controller but i connected one controller's Tx and Rx pins to the ftdi chip that connected to pc with usb to observe what controller is sending. However,when i press the user botton on the board, pc seems like doesnt receive anything, tx and rx leds on ftdi also dont light up.

thanks