/*!
    \file    readme.txt
    \brief   description of TIMER and key EXTI mode demo

    \version 2026-02-10, V1.4.0, demo for GD32G5x3
*/

/*
    Copyright (c) 2026, GigaDevice Semiconductor Inc.

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*/

  This demo is based on the GD32G553M-START-V1.0 board, it provides a description of how
to use TIMER and EXTI to control LED. It uses Mini USB interface to supply power. Wakeup
key, LED and GD-Link are also included.

  After system start-up, firstly, LED1 and LED2 is flashed once for test. The user can
toggle the output state of LED1 by pressing the Wakeup key. Connect PA5 (TIMER1_CH0) and
PA4 with DuPont line. The LED2 will be toggled every 1s.

  On the GD32G553M-START-V1.0 board, LED1 connected to PE14, LED2 connected to PB14, LED3
connected to PB10, LED4 connected to PB13.
