TIM1 定时器输入捕获问题

coolistar

#include"input.h"

#include "usart.h"

 

__IO u16 IC3ReadValue1 = 0, IC3ReadValue2 = 0;

__IO u16 CaptureNumber = 0;

__IO u16 Capture = 0;

__IO u16 TIM1Freq = 0;

void Input_Init()

{

  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

  TIM_ICInitTypeDef  TIM_ICInitStructure;

  GPIO_InitTypeDef GPIO_InitStructure;

  NVIC_InitTypeDef NVIC_InitStructure;

  //?????±??

  RCC_APB1PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  /* ?¨?±?÷?ù±??è????????????100HZ*/

  TIM_TimeBaseStructure.TIM_Period = 60000;

  /* ?±???¤·????? 72M/72 = 1m */

  TIM_TimeBaseStructure.TIM_Prescaler = 1;

  /* ???ù·???  */

  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

  /* ?ò?????????????? */

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  /*?è?¨???¨?????????÷????*/

  TIM_TimeBaseStructure.TIM_RepetitionCounter=0;

  /*?÷????????????????TIM1*/

  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;

  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;

  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;

  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;

  TIM_ICInitStructure.TIM_ICFilter = 0x0;

  TIM_ICInit(TIM1, &TIM_ICInitStructure); 

  TIM_Cmd(TIM1, ENABLE);

  TIM_ITConfig(TIM1, TIM_IT_CC1, ENABLE);

  //GPIO ??????

  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

  //???????×??????  

  NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);

}

void TIM1_CC_IRQHandler(void)

{ 

  if(TIM_GetITStatus(TIM1, TIM_IT_CC1) == SET) 

  {

   

    TIM_ClearITPendingBit(TIM1, TIM_IT_CC1);

    if(CaptureNumber == 0)

    {

    

      IC3ReadValue1 = TIM_GetCapture1(TIM1);

      CaptureNumber = 1;

    }

    else if(CaptureNumber == 1)

    {

  

      IC3ReadValue2 = TIM_GetCapture1(TIM1); 

         

      if (IC3ReadValue2 > IC3ReadValue1)

      {

        Capture = (IC3ReadValue2 - IC3ReadValue1); 

      }

      else

      {

        Capture = ((0xFFFF - IC3ReadValue1) + IC3ReadValue2); 

      }

     

      TIM1Freq = (uint32_t)36000000/ Capture;

printf("\r\n The frenqucy is %.2fHZ\r\n",(TIM1Freq));

      CaptureNumber = 0;

    }

  }

}


程序进不了中断，大家麻烦看一下

正点原子

参考下官方例程吧.