Configure_USART() function

None

This function is used to : -1- Enable GPIO clock and configures the USART pins. -2- NVIC Configuration for USART interrupts. -3- Enable the USART peripheral clock and clock source. -4- Configure USART functional parameters. -5- Enable USART. Peripheral configuration is minimal configuration from reset values. Thus, some useless LL unitary functions calls below are provided as commented examples - setting is default configuration from reset.