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

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