stm32定时器定时中断

• 项目：使用定时器内部时钟实现计数功能。
• 代码：
• Timer.c

  #include "stm32f10x.h"
  
  extern uint16_t Num;
  
  //定时器初始化函数
  void Timer_Init(void)
  {
  	//打开TIM2外设时钟
  	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  	//配置TIM2内部时钟源
  	TIM_InternalClockConfig(TIM2);
  	//定义TIM_TimeBaseInit初始化结构体
  	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
  	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;		//不分频
  	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;	//向上计数
  	/*计数器溢出频率： CK_CNT_OV = CK_CNT/(ARR + 1)
  								 = CK_PSC/(PSC + 1)/ (ARR + 1)*/
  	/*定时1s, 即定时频率为1Hz(CK_CNT_OV); CK_PSC = 72MHz => 设置PSC= 7200-1, 则ARR = 10000 - 1*/
  	TIM_TimeBaseInitStructure.TIM_Period = 10000 - 1;				//ARR
  	TIM_TimeBaseInitStructure.TIM_Prescaler = 7200 - 1;				//PSC
  	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;			//
  	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);				//
  	
  	TIM_ClearFlag(TIM2, TIM_FLAG_Update);			//清除更新标志位，解决刚开始上电就进入中断（即从1开始计数问题）
  	TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);		//开启更新中断到NVIC的通路
  	
  	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);	//配置抢占优先级和子优先级分组
  	
  	NVIC_InitTypeDef NVIC_InitStructure;				//
  	NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;		//TIM2 全局中断  
  	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;		//指定在NVIC_IRQChannel中定义的IRQ通道是否启用或禁用
  	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;	//
  	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;			//
  	NVIC_Init(&NVIC_InitStructure);								//
  	
  	TIM_Cmd(TIM2, ENABLE);	//打开指定的定时器（TIM2）外设
  }
  
  //TIM2中断处理函数
  void TIM2_IRQHandler(void)	
  {
  	if(TIM_GetITStatus(TIM2, TIM_IT_Update) == SET)	//判断更新标志
  	{
  		Num++;
  		TIM_ClearITPendingBit(TIM2, TIM_IT_Update);	//清除标志位
  	}
  }
  

  　　

• Timer.h

  #ifndef __TIMER_H
  #define __TIMER_H
  void Timer_Init(void);
  
  #endif
  

  　　

• main.c

  #include "stm32f10x.h"
  #include "Delay.h"
  #include "OLED.h"
  #include "Timer.h"
  
  uint16_t Num;
  int main(void)
  {
  	OLED_Init();
  	Timer_Init();
  	OLED_ShowString(1,1, "Num:");
  
  	while(1)
  	{		
  		OLED_ShowNum(1,5, Num, 5);
  //		OLED_ShowNum(2,5,TIM_GetCounter(TIM2), 5);
  	}
  }
  

 

• 参考资料
  • 定时器中断基本结构
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  •  执行结果

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