README
This example program echoes data sent in on USART2 on the ST STM32F4DISCOVERY eval board. Uses interrupts for that purpose.
The sending is done in a nonblocking way.
Board connections:
PA2 (USART2_TX) TTL serial output (38400,8,N,1) PA3 (USART2_RX) TTL serial input (38400,8,N,1)