GD32F3x0_Firmware_Library/Examples/TIMER/TIMER1_exttrigger/readme.txt

/*!
    \file  readme.txt
    \brief description of the TIMER1 external trigger demo
*/

/*
    Copyright (C) 2017 GigaDevice

    2017-06-06, V1.0.0, firmware for GD32F3x0
*/

  This demo is based on the GD32350R-EVAL board, it shows how to
start TIMER peripherals with an external trigger.
  TIMER1 is configured as slave timer for an external trigger connected to 
TIMER1 CI0 pin :
  - The TIMER1 CI0FE0 is used as trigger input
  - Rising edge is used to start the TIMER1: event mode
  - TIMER1 is used PWM1 Mode 
  The starts of the TIMER1 counter are controlled by the external trigger 

  Connect the TIMER1 CH0 pin to +3V3 on the board as a external trigger with a
rising edge.