User Guide
GD32L233K-START
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5.5.
TIMER_Key_EXTI
5.5.1.
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
GD32L233K-START board has two keys and one LED. The two keys are Reset key and
Wakeup key. The LED1 is controlled by GPIO.
This demo will show how to use the TIMER PWM to trigger EXTI interrupt to toggle the
state of LED1 and EXTI interrupt line to control the LED1. When press down the Wakeup
Key, it will generate an interrupt. In the interrupt service function, the demo will toggle
LED1.
5.5.2.
DEMO running result
Download the program < 05_TIMER_Key_EXTI > to the START board, LED1 will flash
once for test, press down the Wakeup Key, LED1 will be turned on. Press down the
Wakeup Key again, LED1 will be turned off. Jump JP3 to Dx and connect
PA6(TIMER2_CH0) and PB1 with DuPont line. The LED1 will be toggled every 500ms.
5.6.
USBD_CDC_ACM
5.6.1.
DEMO Purpose
This demo includes the following functions of GD32 MCU:
Learn how to use the USBD peripheral
Learn how to implement USB CDC device
GD32L233K-START board has one USBD interface. In this demo, the GD32L233K-START
board is enumerated as an USB virtual COM port, which was shown in device manager of
