定时器捕获脉冲计数

只看该作者 · 2015-5-21 16:49

本帖最后由 tobyking 于 2015-5-21 17:00 编辑

各位大侠，下面是小弟的程序，小弟初学者，刚用定时器没几天，刚学会产生PWM波形，看看我的为啥检测不到脉冲的输入呢？
我用TIM3产生PWM波形，直接输入到TIM4的CH2，想让pulse_numb_min = TIM_GetCapture2(TIM4)收集到一些脉冲数量，请问我要怎么改？

unsigned int pulse_numb_min=0,pulse_count;

/* Private variables ---------------------------------------------------------*/
TIM_ICInitTypeDef  TIM_ICInitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
/* Private function prototypes -----------------------------------------------*/
void RCC_Config(void);
void GPIO_Config(void);
void NVIC_Config(void);

//void LED_Configuration(void);

/************************************************************/

//extern u8 CAPTURE_STA;

int main(void)

{

  /* System Clocks Configuration */
  RCC_Config();

  /* NVIC configuration */
  NVIC_Config();

  /* Configure the GPIO ports */
  GPIO_Config();

  TIM3_GPIO_Config();//PWM²¨ÐÎÊä³ö¹Ü½ÅÅäÖÃ

      TIM3_Mode_Config(222,121);//Ë«Â·PWM²¨ÐÎ²úÉú£¬Õ¼¿Õ±ÈÉèÖÃ

      LED_Configuration( );

  TIM_DeInit(TIM4);

  TIM_TimeBaseStructure.TIM_Period = 999; //
  TIM_TimeBaseStructure.TIM_Prescaler = 83;  //1MHz
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;//Í¨µÀ2
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //ÉÏÉýÑØ´¥·¢
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
  TIM_ICInitStructure.TIM_ICFilter = 0x0;//²»ÓÃÂË²¨Æ÷

  TIM_ICInit(TIM4, &TIM_ICInitStructure);

  //´¥·¢Æ÷TIM4
  TIM_SelectInputTrigger(TIM4, TIM_TS_TI2FP2); //Ñ¡ÔñIC2ÎªÊ¼ÖÕ´¥·¢Ô´
  TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Reset);//TIM´ÓÄ£Ê½£º´¥·¢ÐÅºÅµÄÉÏÉýÑØÖØÐÂ³õÊ¼»¯¼ÆÊýÆ÷ºÍ´¥·¢¼Ä´æÆ÷µÄ¸üÐÂÊÂ¼þ
  TIM_SelectMasterSlaveMode(TIM4, TIM_MasterSlaveMode_Enable); //Æô¶¯¶¨Ê±Æ÷µÄ±»¶¯´¥·¢

  /* TIM enable counter */
  TIM_Cmd(TIM4, ENABLE);

  /* Enable the CC2 Interrupt Request */
  TIM_ITConfig(TIM4, TIM_IT_CC2, ENABLE);//Ê¹ÄÜÖÐ¶Ï


            while( 1 )
                              {


                                    if(pulse_numb_min >= 50 )
                                    LED1_OFF;
                              }


      }

////////////////////
//ÒÔÉÏÊÇÖ÷³ÌÐò²¿·Ö//
////////////////////

/************ÖÐ¶ÏÀïÃæ×öµÄÊÂÇé**************/

extern unsigned int pulse_numb_min;

void TIM4_IRQHandler(void)
{


/******************************************************************************************/

            if( TIM_GetITStatus(TIM4,TIM_FLAG_CC2)== SET )
                     {

                              pulse_numb_min = TIM_GetCapture2(TIM4);

                     TIM_ClearITPendingBit(TIM4, TIM_IT_CC2);  //Çå³ýTIMµÄÖÐ¶Ï´ý´¦ÀíÎ»
                     }

}

void RCC_Config(void)
  {
  /* TIM3 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
  /* GPIOA and GPIOB clock enable */
  RCC_AHB2PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
}

void GPIO_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* TIM4 channel 2 pin (PB.07) configuration */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//¸¡¿ÕÊäÈë
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;

  GPIO_Init(GPIOB, &GPIO_InitStructure);
}

void NVIC_Config(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  /* Enable the TIM3 global Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}