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libopencm3-examples/examples/stm32/f4/stm32f4-discovery/usart/README.md
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README

This example program sends repeating sequence of characters "0123456789" on USART2 on the ST STM32F4DISCOVERY eval board.

The sending is done in a blocking way.

Board connections

Port Function Description
PA2 (USART2_TX) TTL serial output (38400,8,N,1)