本测试程序，配置GD32F103VE定时器0每500ms中断一次，中断时，开关LED灯。

只讲定时器，多了，有点乱。有的人喜欢汇总，Timer的功能太多，放在一起，会搞混，不好移植。即使放一起，也只能使用其中之一的功能。不必贪婪。测试程序如下：

#include "Timer0.h"
#include "LED.h"

void Timer_Interrupt_Initializtion(uint32_t timer_periph,uint16_t arr,uint16_t psc);

//函数功能:通用定时器0中断初始化
//这里时钟选择为APB1的2倍，而APB1为36M
//arr：自动重装值。
//psc：时钟预分频数
//Timer_Interrupt_Initializtion(TIMER0,50000,1080);//当arr=50000,psc=1080时,则为500ms,误差为10us;
void Timer_Interrupt_Initializtion(uint32_t timer_periph,uint16_t arr,uint16_t psc)
{
	timer_parameter_struct TimerParameterStruct;

	switch(timer_periph)
	{
		case TIMER0:
    	rcu_periph_clock_enable(RCU_TIMER0);      //使能TIMER0的APB2外设时钟
		  nvic_irq_enable(TIMER0_UP_IRQn, 2U, 0U);  //设置TIMER0_UP_IRQn的中断优先级,抢占优先级为2,子优先级为0
    	break;
    case TIMER1:
			rcu_periph_clock_enable(RCU_TIMER1);
		  nvic_irq_enable(TIMER1_IRQn, 2U, 0U);  //设置TIMER1_IRQn的中断优先级,抢占优先级为2,子优先级为0
		  break;
    case TIMER2:
			rcu_periph_clock_enable(RCU_TIMER2);
		  nvic_irq_enable(TIMER2_IRQn, 2U, 0U);  //设置TIMER2_IRQn的中断优先级,抢占优先级为2,子优先级为0
		  break;
    case TIMER3:
			rcu_periph_clock_enable(RCU_TIMER3);
		  nvic_irq_enable(TIMER3_IRQn, 2U, 0U);  //设置TIMER3_IRQn的中断优先级,抢占优先级为2,子优先级为0
		  break;
    case TIMER4:
			rcu_periph_clock_enable(RCU_TIMER4);
		  nvic_irq_enable(TIMER4_IRQn, 2U, 0U);  //设置TIMER4_IRQn的中断优先级,抢占优先级为2,子优先级为0
		  break;
    case TIMER5:
			rcu_periph_clock_enable(RCU_TIMER5);
		  nvic_irq_enable(TIMER5_IRQn, 2U, 0U);  //设置TIMER5_IRQn的中断优先级,抢占优先级为2,子优先级为0
		  break;
    case TIMER6:
			rcu_periph_clock_enable(RCU_TIMER6);
		  nvic_irq_enable(TIMER6_IRQn, 2U, 0U);  //设置TIMER6_IRQn的中断优先级,抢占优先级为2,子优先级为0
		  break;
    default:
    	break;
	}
	timer_deinit(timer_periph);                 //复位TIMERx

TIMERx配置开始
	TimerParameterStruct.period            = arr-1; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
	TimerParameterStruct.prescaler         = psc-1; //设置用来作为TIMx时钟频率除数的预分频值(APB2时钟分频值)
	TimerParameterStruct.clockdivision     = TIMER_CKDIV_DIV1;   //设置时钟分母值为1
	//计算公式:arr*psc/108000000/1,当arr=250,psc=108时,则为0.25ms,误差为1us;
	TimerParameterStruct.counterdirection  = TIMER_COUNTER_UP;   //设置计数方向为"向上计数"
	TimerParameterStruct.alignedmode       = TIMER_COUNTER_EDGE; //设置为无中央对齐计数模式(边沿对齐模式)
	TimerParameterStruct.repetitioncounter = 0;                  //设置"重复计数次数"为0
	timer_init(timer_periph,&TimerParameterStruct);//根据TimerParameterStruct所指向的参数初始化TIMERx的时间基数单位
TIMERx配置结束

	timer_counter_value_config(timer_periph,0);//设置TIMERx的计数器初始值为0
	//timer_counter_read(timer_periph);//读取TIMERx的计数器值

  timer_auto_reload_shadow_enable(timer_periph);//使能TIMERx自动重装载

	timer_flag_clear(timer_periph,TIMER_FLAG_UP);               //清除"TIMERx更新标志位"
	timer_interrupt_flag_clear(timer_periph,TIMER_INT_FLAG_UP); //清除"TIMERx更新中断标志位"
	timer_interrupt_enable(timer_periph,TIMER_INT_UP);          //使能"TIMERx更新"产生中断

  timer_internal_clock_config(timer_periph);//设置"内部时钟"作为定时器时钟
	//timer_slave_mode_select(timer_periph,TIMER_SLAVE_MODE_DISABLE);
	//设置"关闭从模式",如果TIMER计数器使能,则预分频器直接由内部时钟驱动

	timer_enable(timer_periph);//TIMERx计数器使能,开始工作
}


//函数功能:TIMER0更新中断服务程序
void TIMER0_UP_IRQHandler(void)
{
	if( timer_interrupt_flag_get(TIMER0,TIMER_INT_FLAG_UP) )// 读取更新中断标志位
	{
		MCU_Led_Toggle();
		timer_flag_clear(TIMER0,TIMER_FLAG_UP);               //清除"TIMER0更新标志位"
		timer_interrupt_flag_clear(TIMER0,TIMER_INT_FLAG_UP); //清除"更新中断标志位"
	}
}

#include "LED.h"

void LED_Init(void);

//函数功能:初始化MCU_Led
void LED_Init(void)
{
	rcu_periph_clock_enable(RCU_GPIOD);//使能GPIOD时钟,enable GPIO clock

	gpio_init(GPIOD, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_15);
	//将GPIOD15设置为输出上拉

	MCU_Led_Off();
//	GPIO_BC(GPIOD) = GPIO_PIN_15;//清除GPIOD15输出,GPIO bit clear register
}

#ifndef __LED_H
#define __LED_H

#include "gd32f10x.h" //使能uint8_t,uint16_t,uint32_t,uint64_t,int8_t,int16_t,int32_t,int64_t

#define MCU_Led_Off()  GPIO_BOP(GPIOD)=GPIO_PIN_15  //GD15输出高电平
#define MCU_Led_On() GPIO_BC(GPIOD)=GPIO_PIN_15   //GD15输出低电平
#define MCU_Led_Toggle() gpio_bit_write( GPIOD,GPIO_PIN_15,(bit_status)((1-gpio_input_bit_get(GPIOD,GPIO_PIN_15))) )
//GD15取反输出电平

extern void LED_Init(void);

#endif

main.c程序如下：

#include "gd32f10x.h" //使能uint8_t,uint16_t,uint32_t,uint64_t,int8_t,int16_t,int32_t,int64_t
#include "delay.h"

#include "LED.h"
#include "Timer0.h"

int main(void)
{
	//NVIC_PRIGROUP_PRE4_SUB0:抢占优先级为4bit(取值为0~15),子优先级为0bit(没有响应优先级)
	//NVIC_PRIGROUP_PRE3_SUB1:抢占优先级为3bit(取值为0~7),子优先级为1bit(取值为0~1)
	//NVIC_PRIGROUP_PRE2_SUB2:抢占优先级为2bit(取值为0~3),子优先级为2bit(取值为0~3)
	//NVIC_PRIGROUP_PRE1_SUB3:抢占优先级为1bit(取值为0~1),子优先级为3bit(取值为0~7)
	//NVIC_PRIGROUP_PRE0_SUB4:抢占优先级为0bit(没有抢占优先级),子优先级为3bit(取值为0~15)
	nvic_priority_group_set(NVIC_PRIGROUP_PRE4_SUB0);//设置系统中断优先级"抢占优先级为4bit,子优先级为0bit"
  INTX_ENABLE();//开启所有中断

	LED_Init();//初始化MCU_Led
	delay_init();//系统时钟配置

	Timer_Interrupt_Initializtion(TIMER0,50000,1080);//设置TIMER0中断周期为500ms,误差为10us;

	while(1)
	{
		delay_ms(200);//软件延时200ms
	}
}