TIM1输入捕获测量方波信号周期

//main.c

#include"stm8s.h"
#include"main.h"
#include"tm1638.h"
extern volatile u16 captureValue1,captureValue2;//存放俩次捕获的值
volatile u8 successFlag=0;//连续俩次成功捕获将该位置一
extern volatile u16	numberOfCapture；//捕获次数
u32 frequency=0;//频率
int main(void)
{
	CLK->CKDIVR=0X00;//主时钟HSI一分频，即为16MHz
	GPIO_Init(GPIOC, GPIO_PIN_4, GPIO_MODE_OUT_PP_HIGH_FAST);//PC4 COO输出引脚
	GPIO_Init(GPIOC, GPIO_PIN_6, GPIO_MODE_IN_PU_NO_IT);//TIM1_CH1通道引脚
	Tim1_Init();//TIM1初始化
	init_TM1638();//该模块用以将频率值显示在数码管上
	rim();//开总中断
	CLK_CCOConfigCLK_CCOConfig(CLK_OUTPUT_LSI);//输出LSI时钟128KHz
	CLK_CCOCmd(ENABLE);//开启CCO
	while(1)
 	 {
		if(successFlag==1)
   		 {
			frequency=(8*16000000UL)/(captureValue2-captureValue1);
			frequency/=100;//以KHz为单位，小数点后一位
			successFlag=0;
			Display(frequency);    //显示频率值
			successFlag=0;
		    	TIM1_CCxCmd(TIM1_CHANNEL_1,ENABLE);//开启TIM1_CH1通道的输入捕获
   		 }
	 }
}

      
       
#ifdef USE_FULL_ASSERT
void assert_failed(u8* file,u32 line)
{
	while(1)
 	 {
 	 }
}
#endif

//main.h
#ifndef    _MAIN_H
#define   _MAIN_H
#include"stm8s.h"
#include"tm1638.h"
u8 qian,bai,shi,ge,wan;
extern u32 frequency;
extern unsigned char tab[];
void Tim1_Init(void)
{
	TIM1_ICInit(TIM1_CHANNEL_1, TIM1_ICPOLARITY_RISING，TIM1_ICSELECTION_DIRECTTI, TIM1_ICPSC_DIV8,0x00);
	//TIM1_CH1通道，上升沿，八分频
	TIM1_UpdateRequestConfig(TIM1_UPDATESOURCE_REGULAR);//更新事件中断
	TIM1_GenerateEvent(TIM1_EVENTSOURCE_UPDATE);//产生一个更新事件，更新寄存器
	TIM1_ITConfig(TIM1_IT_UPDATE, ENABLE);//使能更新中断
	TIM1_ITConfig(TIM1_IT_CC1, ENABLE);//开启捕获中断
	TIM1_Cmd(ENABLE);//开TIM1
 	TIM1_CCxCmd(TIM1_CHANNEL_1,ENABLE);//开捕获
}
void Display(u32 frequency)
{ 
	wan=frequency/10000;
 	qian=frequency%10000/1000;
	bai=frequency%1000/100;
	shi=frequency%100/10; 
	ge=frequency%10; 
	Write_DATA(0<<1,tab[wan]);
	Write_DATA(1<<1,tab[qian]);
  	Write_DATA(2<<1,tab[bai]); 
	Write_DATA(3<<1,tab[shi]|0x80);//带小数点
	Write_DATA(4<<1,tab[ge]);
}

#endif

//stm8s_it.c
#include"stm8s_it.h"
extern volatile u16 count;//用于TIM4计数
volatile u8 numberOfCapture;
volatile u16
captureValue1=0,captureValue2=0;
extern volatile u8 successFlag;
INTERRUPT_HANDLER(TIM1_UPD_OVF_TRG_BRK_IRQHandler,11)
{
  /*
In order to detect unexpected events during development,    
it is recommended to set a breakpoint on the following instruction.
  */
	TIM1_ClearITPendingBit(TIM1_IT_UPDATE);//清除溢出中断标志
	numberOfCapture=0;//捕获过程发生中断则重新捕获
}
 
INTERRUPT_HANDLER(TIM1_CAP_COM_IRQHandler,12)
{
  /*
In order to detect unexpected events during development,
 it is recommended to set a breakpoint on the following instruction.
  */
	 if((TIM1->SR1&TIM1_FLAG_CC1)!=0)
	  {
		if(numberOfCapture==0)//第一次捕获
 		  {
 			captureValue1=TIM1_GetCapture1();    
			numberOfCapture=1;
 		  }
 		 else//第二次捕获
		   {
 			  TIM1_CCxCmd(TIM1_CHANNEL_1,DISABLE);
  			  captureValue2=TIM1_GetCapture1();
    			  numberOfCapture=0;    
    			  successFlag=1;
   		}
 	 }   
}