捕获测量脉冲宽度

小菜鸟

哪位大侠做过定时器捕获测量脉冲宽度的，求分享，我怎么整都不对！！！！

东方大乐透

把你的代码先贴出来吧

小菜鸟

东方大乐透 发表于 2014-4-10 21:08
把你的代码先贴出来吧

void Tim_Pwm_GPIO()
{
        GPIO_InitTypeDef GPIO_InitStructure;       
        TIM_ICInitTypeDef  TIM_ICInitStructure;
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
       
       
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);      
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;                             
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

       
        TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
  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_PWMIConfig(TIM3, &TIM_ICInitStructure);
  TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2);
  TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
  TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
  TIM_Cmd(TIM3, ENABLE);
  TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE);

}


void NVIC_int()
{ NVIC_InitTypeDef NVIC_InitStructure;       
        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
       
        NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;                     
  //NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

}

void int_int()
{ Tim_Pwm_GPIO();
        NVIC_int();
}
void TIM3_IRQHandler(void)
{
  
  TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);               
  IC2Value = TIM_GetCapture2(TIM3);
  IC1Value = TIM_GetCapture1(TIM3);
       
        T=IC2Value*1/72000;
  T1=T/10%10;
  T2=T%10;       
  
}

那些变量定义就不贴了，都定义过，编译使语法没错了！我是这样的想法：判断只要周期T大于20ms就亮灯，我用外部产生的20HZ(用示波器测量过了没错)输入进去，可是就是灯不亮！！！麻烦你帮俺瞧瞧