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实验二、设置1ms定时器 

/***************************************************************************//**
  文件: main.c
  版本: V1.0.0
  时间: 202101201
	平台:MINI-GD32F103C8T6开发板

*******************************************************************************/
#include "gd32f10x.h"
#include "gd32f10x_libopt.h"
#include "systick.h"

//定时器配置
void timer_config(void)
{
    /* -----------------------------------------------------------------------
	  系统主频108MHZ,timer_initpara.prescaler为107，timer_initpara.period为999，频率就为1KHZ
    ----------------------------------------------------------------------- */
    timer_parameter_struct timer_initpara;
    rcu_periph_clock_enable(RCU_TIMER1);
    timer_deinit(TIMER1);
    /* TIMER1 configuration */
    timer_initpara.prescaler         = 107;
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;
    timer_initpara.period            = 999;
    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
    timer_initpara.repetitioncounter = 0;
    timer_init(TIMER1,&timer_initpara);
	  nvic_priority_group_set(NVIC_PRIGROUP_PRE1_SUB3);
		nvic_irq_enable(TIMER1_IRQn, 0, 1);
		timer_interrupt_enable(TIMER1, TIMER_INT_UP);
    /* auto-reload preload enable */
    timer_auto_reload_shadow_enable(TIMER1);
    /* auto-reload preload enable */
    timer_enable(TIMER1);
}
int main(void)
{

	rcu_ahb_clock_config(RCU_AHB_CKSYS_DIV1);//AHB主频是1分频
	systick_config();//系统主频108MHZ,采用外部晶振,由两个宏决定(__SYSTEM_CLOCK_108M_PLL_HXTAL与HXTAL_VALUE)
	rcu_periph_clock_enable(RCU_AF);//管脚复用时钟alternate function clock使能
	delay_1ms(1000);//等待1秒
	gpio_pin_remap_config(GPIO_SWJ_NONJTRST_REMAP, ENABLE);//PB4管脚默认是NJTRST，要当GPIO，需要重映射
	rcu_periph_clock_enable(RCU_GPIOB);//GPIOB时钟使能
	gpio_init(GPIOB, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_4);//PB4配置成输出
	timer_config();//定时器初始化配置，1ms进入一次中断，TIMER1_IRQHandler()函数中实现LED闪烁
    while(1)
    {

    }
}