[README] Renamed all readme files to indicate markup format.
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examples/stm32/f4/stm32f4-discovery/usart/README.md
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examples/stm32/f4/stm32f4-discovery/usart/README.md
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README
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------------------------------------------------------------------------------
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This example program sends repeating sequence of characters "0123456789" on
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USART2 on the ST STM32F4DISCOVERY eval board.
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The sending is done in a blocking way.
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Board connections:
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------------------
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PA2 (USART2_TX) TTL serial output (38400,8,N,1)
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