STM32 最简单的边沿触发脉冲计数程序

 

#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "usart.h"
#include "timer.h"
#include "lcd.h"


extern u8 sign;
extern u16 TIM5CH1_CAPTURE_COUNT;
 int main(void)
 {		 
	delay_init();	    	 //延时函数初始化	  
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 	 //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
	uart_init(115200);	 //串口初始化为115200
 	LED_Init();			     //LED端口初始化
	LCD_Init();			   	    //初始化LCD 	
	KEY_Init();         	//初始化与按键连接的硬件接口
  TIM3_Int_Init(4999,7199);	 //72000000/(4999+1)(7199+1)=2Hz----500ms
  TIM5_Int_Init(4999,7199);	 //

	 
	 
	 while(1)
	 {
		 TIM_SetCompare2(TIM3,2500);		   
	     LCD_ShowNum(10,80,TIM5CH1_CAPTURE_COUNT,24,16);
		 LCD_ShowNum(10,120,sign,24,16);
	 }

 }

#include "timer.h"
#include "led.h"
#include "usart.h"

void TIM3_Int_Init(u16 arr,u16 psc)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	NVIC_InitTypeDef NVIC_InitStructure;

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能

	TIM_TimeBaseStructure.TIM_Period = arr; //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	 计数到5000为500ms
	TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  10Khz的计数频率  
	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_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
 
	TIM_ITConfig(  //使能或者失能指定的TIM中断
		TIM3, //TIM2
		TIM_IT_Update  |  //TIM 中断源
		TIM_IT_Trigger,   //TIM 触发中断源 
		ENABLE  //使能
		);
	NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中断
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
	NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

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




void TIM5_Int_Init(u16 arr,u16 psc)
{	  
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  	TIM_ICInitTypeDef TIM5_ICInitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //tim5时钟使能
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //pa端口使能
	
	

	TIM_TimeBaseStructure.TIM_Period = arr; //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	
	TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
	TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位
	

	TIM5_ICInitStructure.TIM_Channel=TIM_Channel_1;//通道1----CH1----pa0
	TIM5_ICInitStructure.TIM_ICFilter=0x00;//不滤波
	TIM5_ICInitStructure.TIM_ICPolarity=TIM_ICPolarity_Rising;//上升沿检测
	TIM5_ICInitStructure.TIM_ICPrescaler=TIM_ICPSC_DIV1;
	TIM_ICInit(TIM5,&TIM5_ICInitStructure);
	
	TIM_ITConfig(TIM5,TIM_IT_CC1,ENABLE);//允许更新中断和捕获中断
	

	//中断分组初始化
	NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;  //TIM5中断
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;  //先占优先级2级
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //从优先级0级
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
	NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器 
	
	TIM_Cmd(TIM5, ENABLE);  //使能TIMx					 
}

u16 TIM5CH1_CAPTURE_COUNT=0;//输入捕捉数

//定时器5中断服务程序
void TIM5_IRQHandler(void)   //TIM3中断
{
	if (TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)  //检查TIM5更新中断发生与否
		{
	    TIM5CH1_CAPTURE_COUNT++;
			LED1=!LED1;
		}
		 TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位
}


u8 sign=0;
//定时器3中断服务程序
void TIM3_IRQHandler(void)   //TIM3中断
{
	if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)  //检查TIM3更新中断发生与否
		{
			if(sign++==10)
			{
					TIM5CH1_CAPTURE_COUNT=0;
                    sign=0;				
			}
		}
			TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //清除TIMx的中断待处理位:TIM 中断源 
}