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https://bravikov.wordpress.com/2014/10/07/%d0%b8%d0%b7%d0%bc%d0%b5%d1%80%d0%b5%d0%bd%d0%b8%d0%b5-%d1%81%d0%ba%d0%be%d1%80%d0%be%d1%81%d1%82%d0%b8-uart/
Измерение скорости UART