/*!
    \file    readme.txt
    \brief   description of TRIGSEL timer trigger EXTI demo

    \version 2025-02-20, V1.4.0, demo for GD32E502
*/

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*/

  This example is based on the GD32E502R-START board, it shows how to trigger EXTI
using TRIGSEL select TIMER1_CH0 as trigger source. When program is running, LED2 flash 
one time firstly. Then the EXTI10 interrupt is triggered by TRIGSEL every 200ms, and LED2 
state is toggled by the interrupt.
  On the board, the LED2 connected to PF5, EXTI10 connect to PA10, the TIMER1_CH0 is 
output to TRIGSEL_OUT0(PC10). And the PC10 should connect to PA10.
