User Guide
GD32130F-START
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5.4.
TIMER_Key_EXTI
5.4.1.
DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use GPIO control the LED and the KEY
Learn to use EXTI to generate external interrupt
Learn to use TIMER to generate PWM
GD32130F-START-V1.0 board has two keys and two LEDs. The two keys are Reset key and
User key. The LED1 and LED2 are controlled by GPIO.
This demo will show how to use the TIMER PWM to trigger EXTI interrupt to toggle the state
of LED2 and EXTI interrupt line to control the LED1. When press down the User Key, it will
produce an interrupt. In the interrupt service function, the demo will toggle LED1.
5.4.2.
DEMO running result
Download the program < 04_TIMER_Key_EXTI > to the START board, all the LEDs are
flashed once for test, press down the Wakeup Key, LED1 will be turned on. Press down the
User Key again, LED1 will be turned off. Connect PA6 (TIMER2_CH0) and PA2 with DuPont
line. The LED2 will be toggled every 500ms.
