UART modifications:
UART modifications:

Use USART3

Don't use USART_IT_TXE and USART_IT_RXNE (those are for internal HAL usage).
Use USART_ISR_TXE_TXFNF and USART_ISR_RXNE_RXFNE istead.
Tested 9600, 115200, 230400, 345600, 921600 baud (with a quick loopback test).

google/DAPLink-port,google/DAPLink-port,google/DAPLink-port,google/DAPLink-port