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;

    }

  }   

}