ta bit, 1 start bit, 1 stop bit, no parity). No HW flow control is used. GPIO associated to User push-button is linked with EXTI.</p>
<p>Example execution:</p>
<p>After startup from reset and system configuration, LED2 is blinking quickly.</p>
<p>On press on push button, USART RX Not Empty interrupt is enabled.</p>
<p>When character is received on USART Rx line, a RXNE interrupt occurs.</p>
<p>Received data is read from USART RDR register and stored in user buffer.</p>
<p>A double buffer is available for re