easydemo_2342S/peripheral/myInputCapture.c

#include "myInputCapture.h"
#include "board.h"
#include "stm32f10x.h"
#include "stm32f10x_adc.h"
#include "stm32f10x_tim.h"

__IO uint16_t IC3ReadValue1 = 0, IC3ReadValue2 = 0;
__IO uint16_t CaptureNumber = 0;
__IO uint32_t Capture = 0;
__IO uint32_t TIM3Freq = 0;
CaptureCallback inputCaptureCb;
void myInputCaptureTIM2_CH3_init(CaptureCallback cb)
{
    NVIC_InitTypeDef NVIC_InitStructure;
    TIM_ICInitTypeDef  TIM_ICInitStructure;
	/* TIM2 clock enable */
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    /* Enable the TIM3 global Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    /* TIM3 configuration: Input Capture mode ---------------------
      The external signal is connected to TIM3 CH2 pin (PA.07)  
      The Rising edge is used as active edge,
      The TIM3 CCR2 is used to compute the frequency value 
    ------------------------------------------------------------ */

    TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;
    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(TIM2, &TIM_ICInitStructure);
    
    /* TIM enable counter */
    TIM_Cmd(TIM2, ENABLE);

    /* Enable the CC2 Interrupt Request */
    TIM_ITConfig(TIM2, TIM_IT_CC3, ENABLE);

    inputCaptureCb = cb;
}
/******************************************************************************/
/*            STM32F10x Peripherals Interrupt Handlers                        */
/******************************************************************************/
/**
  * @brief  This function handles TIM3 global interrupt request.
  * @param  None
  * @retval None
  */
void TIM2_IRQHandler(void)
{ 
  if(TIM_GetITStatus(TIM2, TIM_IT_CC3) == SET) 
  {
    /* Clear TIM2 Capture compare interrupt pending bit */
    TIM_ClearITPendingBit(TIM2, TIM_IT_CC3);
    if(CaptureNumber == 0)
    {
      /* Get the Input Capture value */
      IC3ReadValue1 = TIM_GetCapture3(TIM2);
      CaptureNumber = 1;
    }
    else if(CaptureNumber == 1)
    {
      /* Get the Input Capture value */
      IC3ReadValue2 = TIM_GetCapture3(TIM2); 
      
      /* Capture computation */
      if (IC3ReadValue2 > IC3ReadValue1)
      {
        Capture = (IC3ReadValue2 - IC3ReadValue1); 
      }
      else
      {
        Capture = ((0xFFFF - IC3ReadValue1) + IC3ReadValue2); 
      }
      /* Frequency computation */ 
      TIM3Freq = (uint32_t) SystemCoreClock / Capture;
      CaptureNumber = 0;

      inputCaptureCb(IC3ReadValue1, IC3ReadValue2, TIM3Freq);
    }
  }
}
void myInputCaptureTIM3_CH4_init(CaptureCallback cb)
{
    NVIC_InitTypeDef NVIC_InitStructure;
    TIM_ICInitTypeDef  TIM_ICInitStructure;
	/* TIM2 clock enable */
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    /* Enable the TIM3 global Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    /* TIM3 configuration: Input Capture mode ---------------------
      The external signal is connected to TIM3 CH2 pin (PA.07)  
      The Rising edge is used as active edge,
      The TIM3 CCR2 is used to compute the frequency value 
    ------------------------------------------------------------ */

    TIM_ICInitStructure.TIM_Channel = TIM_Channel_4;
    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(TIM3, &TIM_ICInitStructure);
    
    /* TIM enable counter */
    TIM_Cmd(TIM3, ENABLE);

    /* Enable the CC2 Interrupt Request */
    TIM_ITConfig(TIM3, TIM_IT_CC4, ENABLE);

    inputCaptureCb = cb;
}

/******************************************************************************/
/*            STM32F10x Peripherals Interrupt Handlers                        */
/******************************************************************************/
/**
  * @brief  This function handles TIM3 global interrupt request.
  * @param  None
  * @retval None
  */
void TIM3_IRQHandler(void)
{ 
  if(TIM_GetITStatus(TIM3, TIM_IT_CC4) == SET) 
  {
    /* Clear TIM3 Capture compare interrupt pending bit */
    TIM_ClearITPendingBit(TIM3, TIM_IT_CC4);
    if(CaptureNumber == 0)
    {
      /* Get the Input Capture value */
      IC3ReadValue1 = TIM_GetCapture4(TIM3);
      CaptureNumber = 1;
    }
    else if(CaptureNumber == 1)
    {
      /* Get the Input Capture value */
      IC3ReadValue2 = TIM_GetCapture4(TIM3); 
      
      /* Capture computation */
      if (IC3ReadValue2 > IC3ReadValue1)
      {
        Capture = (IC3ReadValue2 - IC3ReadValue1); 
      }
      else
      {
        Capture = ((0xFFFF - IC3ReadValue1) + IC3ReadValue2); 
      }
      /* Frequency computation */ 
      TIM3Freq = (uint32_t) SystemCoreClock / Capture;
      CaptureNumber = 0;

      inputCaptureCb(IC3ReadValue1, IC3ReadValue2, TIM3Freq);
    }
  }
}