芯片：STM32F103GCT6
原理图：

实现：PC6——闪烁，PC7——常亮
main.c

//头文件
#include "stm32f10x.h"
#include "user.h"

//全局变量
uint8_t  g_1s_flag = 0;
uint8_t  g_uart1_rx_done = 0;

uint32_t g_ms = 0;
uint32_t g_s = 0;

uint8_t  g_uart1_rx_buff[256] = {0};

uint16_t Compare = 0;

void User_tick_timer_handler(void)
{
    g_ms++;
    
    if((g_ms%500) == 0)
    {
        if(PCin(13) == 1)
        {
            PCout(13) = 0;
        }
        else
        {
            PCout(13) = 1;
        }
    }
    
    if((g_ms%1000) == 0)
    {
        g_s++;
        g_1s_flag = 1;
    }
}
/******************************************************************************
* 函数名称：main
* 功能概要：主函数
* 参数说明：无
* 函数返回：无
******************************************************************************/
int main(void)
{
    Delay_init();               //定时器延时初始化
//    Usart1_init(9600);        //Uart1初始化
//    NVIC_Configuration();       //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
    GPIO_Configuration();       //IO配置
//    TIM2_init(999, 71);         //TIM2初始化，arr = 定时us*[72/(psc+1)]-1，这里定时1000us
    TIM3_init();          //TIM3初始化，arr = 定时us*[72/(psc+1)]-1，这里定时50us
//    delay_ms(10);  
	GPIO_SetBits(GPIOC, GPIO_Pin_7 );		 
    while(1)
    {
	GPIO_ResetBits(GPIOC, GPIO_Pin_7 );	
    }
}

user.c

/******************************************************************************
 * Source code file of user.c
******************************************************************************/
#include "user.h"

/******************************************************************************
* 函数名称：GPIO_Configuration
* 功能概要：GPIO初始化
* 参数说明：无
* 函数返回：无
******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC , ENABLE);
//==============
//  LED01 -> PC7     LED02 -> PC6  
//==============
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; 
  GPIO_Init(GPIOC, &GPIO_InitStructure);
}

/******************************************************************************
* 函数名称：TIM3_init
* 功能概要：定时器3初始化
* 参数说明：arr - 自动重装值
*           psc - 时钟预分频数
* 函数返回：无
* 备注：    这里时钟选择为APB1的2倍，而APB1为36M
******************************************************************************/
void TIM3_init(void )
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    NVIC_InitTypeDef         NVIC_InitStructure;
    TIM_OCInitTypeDef        TIM_OCInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);    //时钟使能
                             
    //定时器TIM3初始化
    TIM_TimeBaseStructure.TIM_Period =1000-1; 
    TIM_TimeBaseStructure.TIM_Prescaler =7200-1; //设置用来作为TIMx时钟频率除数的预分频值
    TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
	TIM_TimeBaseStructure.TIM_RepetitionCounter=0;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位

//    TIM_ClearFlag(TIM3,TIM_FLAG_Update);
	  /* Channel 1, 2,3 and 4 Configuration in PWM mode */
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//输出模式1:占空比模式
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_Pulse = 0;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
	 
	TIM_OC1Init(TIM3, &TIM_OCInitStructure);

	/*中断优先级NVIC设置*/
	NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;                                
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;        //先占优先级1级
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;                        //从优先级1级
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                                //使能IRQ通道
	NVIC_Init(&NVIC_InitStructure);                                                         //初始化NVIC寄存器
	 
	TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE );                                 //使能TIMx指定的中断
// 	TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
//    TIM_ARRPreloadConfig(TIM3, ENABLE);

	GPIO_SetBits(GPIOC, GPIO_Pin_6); 	//LED初始化

    TIM_Cmd(TIM3, ENABLE);  //使能TIMx
}

void TIM3_IRQHandler(void)
{
    if(TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)   //检查TIM3更新中断发生与否
    {
		GPIO_WriteBit(GPIOC,GPIO_Pin_6,(BitAction)(1-(GPIO_ReadOutputDataBit(GPIOC,GPIO_Pin_6))));   //取反PB.1

        TIM_ClearITPendingBit(TIM3, TIM_IT_Update);     //清除TIMx更新中断标志 

    }
}
/******************************************************************************
 * End of file
******************************************************************************/