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libopencm3-examples/examples/stm32/f0/stm32f0-discovery/usart_stdio

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README
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This example program sends some characters on USART1 on the
ST STM32F0DISCOVERY eval board. PA9

The terminal settings for the receiving device/PC are 38400 8n1.

The sending is done using newlib-nano library in a blocking way in the code.