how to run usart1 in stm32F769I-disco ?

[Eblec.1]

hello. I try to run usart1 in stm32F769I-disco. It is declared as : The serial interface USART1 is directly available as a virtual COM port of the PC, connected to the ST-LINK/V2-1 USB connector CN1. I added MX_USART1_UART_Init(HAL_UART_Init) and call HAL_UART_Transmit but it seems to not working. please advice. thanks.

[TDK]

Do you have the correct pins selected?

Does the VCP show up in the device manager?

Show your actual code used.