STM32F0xx_StdPeriph_Examples/TIM/TIM_InputCapture/stm32f0xx_it.c

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/**
  ******************************************************************************
  * @file    TIM/TIM_InputCapture/stm32f0xx_it.c 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   Main Interrupt Service Routines.
  *          This file provides template for all exceptions handler and 
  *          peripherals interrupt service routine.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f0xx_it.h"

/** @addtogroup STM32F0xx_StdPeriph_Examples
  * @{
  */

/** @addtogroup TIM_Input_Capture
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
uint16_t IC3ReadValue1 = 0, IC3ReadValue2 = 0;
uint16_t CaptureNumber = 0;
uint32_t Capture = 0;
uint32_t TIM1Freq = 0;

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/******************************************************************************/
/*            Cortex-M0 Processor Exceptions Handlers                         */
/******************************************************************************/

/**
  * @brief  This function handles NMI exception.
  * @param  None
  * @retval None
  */
void NMI_Handler(void)
{
}

/**
  * @brief  This function handles Hard Fault exception.
  * @param  None
  * @retval None
  */
void HardFault_Handler(void)
{
  /* Go to infinite loop when Hard Fault exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles SVCall exception.
  * @param  None
  * @retval None
  */
void SVC_Handler(void)
{
}

/**
  * @brief  This function handles PendSVC exception.
  * @param  None
  * @retval None
  */
void PendSV_Handler(void)
{
}

/**
  * @brief  This function handles SysTick Handler.
  * @param  None
  * @retval None
  */
void SysTick_Handler(void)
{
}

/******************************************************************************/
/*                 STM32F0xx Peripherals Interrupt Handlers                   */
/*  Add here the Interrupt Handler for the used peripheral(s) (PPP), for the  */
/*  available peripheral interrupt handler's name please refer to the startup */
/*  file (startup_stm32f0xx.s).                                               */
/******************************************************************************/
/**
  * @brief  This function handles TIM1 Capture Compare interrupt request.
  * @param  None
  * @retval None
  */
void TIM1_CC_IRQHandler(void)
{ 
  if(TIM_GetITStatus(TIM1, TIM_IT_CC2) == SET) 
  {
    /* Clear TIM1 Capture compare interrupt pending bit */
    TIM_ClearITPendingBit(TIM1, TIM_IT_CC2);
    if(CaptureNumber == 0)
    {
      /* Get the Input Capture value */
      IC3ReadValue1 = TIM_GetCapture2(TIM1);
      CaptureNumber = 1;
    }
    else if(CaptureNumber == 1)
    {
      /* Get the Input Capture value */
      IC3ReadValue2 = TIM_GetCapture2(TIM1); 
      
      /* Capture computation */
      if (IC3ReadValue2 > IC3ReadValue1)
      {
        Capture = (IC3ReadValue2 - IC3ReadValue1); 
      }
      else if (IC3ReadValue2 < IC3ReadValue1)
      {
        Capture = ((0xFFFF - IC3ReadValue1) + IC3ReadValue2); 
      }
      else
      {
        Capture = 0;
      }
      /* Frequency computation */ 
      TIM1Freq = (uint32_t) SystemCoreClock / Capture;
      CaptureNumber = 0;
    }
  }
}

/**
  * @brief  This function handles PPP interrupt request.
  * @param  None
  * @retval None
  */
/*void PPP_IRQHandler(void)
{
}*/

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/