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libopencm3-examples/examples/stm32/f4/stm32f4-discovery/usart_irq/README

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README
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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:
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PA2 (USART2_TX) TTL serial output (38400,8,N,1)
PA3 (USART2_RX) TTL serial input (38400,8,N,1)