/*!
    \file  readme.txt
    \brief description of the EXTI Key example
*/

/*
    Copyright (C) 2017 GigaDevice

    2014-12-26, V1.0.0, platform GD32F1x0(x=3,5)
    2016-01-15, V2.0.0, platform GD32F1x0(x=3,5,7,9)
    2016-04-30, V3.0.0, firmware update for GD32F1x0(x=3,5,7,9)
    2017-06-19, V3.1.0, firmware update for GD32F1x0(x=3,5,7,9)
*/

  This demo is based on the GD32150R-EVAL/GD32190R-EVAL board, it shows how to
generate the interrupt request, and toggle the LED. After the system start-up, 
LED1 is on. When Tamper Key is pressed, LED2 is toggled, it is switched on; when 
Tamper Key is pressed once again, LED2 is toggled, it is switched off.

