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+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example program echoes data sent in on USART2 on the
+ST STM32F4DISCOVERY eval board. Uses interrupts for that purpose.
+
+Connect your TTL RX device line to PA2 on the discovery board.
+Connect your TTL TX device line to PA3 on the discovery board.
+
+The terminal settings for the receiving device/PC are 38400 8n1.
+
+The sending is done in a blocking way in the code.
+