/*!
    \file  readme.txt
    \brief description of USART printf example
*/

/*
    Copyright (C) 2017 GigaDevice

    2018-04-23, V1.0.0, demo for GD32F30x
*/

  This demo is based on the GD32307E-START-V1.0 board, it shows how to use the key control
the LED and how to retarget the C library printf function to the USART. If the user
key is detected pressed, LED1 will be turned on, and the "UART to USB" connector CN3 will print "USART 
printf example" on PC via a Mini USB cable, otherwise LED1 will be turned off.