STM8系列--PWM捕获输入检测

最重要的下载程序的option bety 设置；

函数1：

void Init_Timer1(void)
{    
    GPIO_Init(GPIOC, GPIO_PIN_6, GPIO_MODE_IN_PU_NO_IT);   //输入浮动，没有外部中断     
    TIM1_DeInit();                                         //tim1 定时器寄存器全部复位  
    TIM1_TimeBaseInit(31, TIM1_COUNTERMODE_UP, 15625-1, 0);//  500ms  最小捕获5hz      设置时间分频  向上计数    捕捉5Hz及 以上的周期和占空比         
    TIM1_PWMIConfig(TIM1_CHANNEL_1, TIM1_ICPOLARITY_RISING, TIM1_ICSELECTION_DIRECTTI, TIM1_ICPSC_DIV1, 0x00); //选择TI1输入上升沿触发 选择TI2输入下降沿触发 输入捕捉预定标器  无滤波
    TIM1_SelectInputTrigger(TIM1_TS_TI1FP1);                 //滤波后输入TI1
    TIM1_SelectSlaveMode(TIM1_SLAVEMODE_RESET);  //复位输入
    TIM1_ClearFlag(TIM1_FLAG_CC1);                                 //指定要清除的标志
    TIM1_ClearFlag(TIM1_FLAG_CC2);                                //指定要清除的标志
    TIM1_ITConfig( TIM1_IT_CC1, ENABLE);                     //去掉是查询方式，否则是中断方式
    TIM1_ITConfig( TIM1_IT_CC2, ENABLE);                    //去掉是查询方式，否则是中断方式
    TIM1_CCxCmd(TIM1_CHANNEL_1, ENABLE);          //使能输入捕获通道1
    TIM1_CCxCmd(TIM1_CHANNEL_2, ENABLE);          //使能输入捕获通道2
    TIM1_Cmd(ENABLE);                                                     //使能定时器
 
}

函数2：

extern __IO uint32_t LSIClockFreq;
extern __IO uint32_t LSIDuty;
INTERRUPT_HANDLER(TIM1_CAP_COM_IRQHandler, 12)
{
  /* In order to detect unexpected events during development,
     it is recommended to set a breakpoint on the following instruction.
  */
  uint16_t num = 0;
  static uint16_t num1;
  static uint32_t num2;

 if(TIM1_GetITStatus(TIM1_IT_CC1) != RESET) //如果CH1边沿触
  {  
      num1 = TIM1_GetCapture1();  
      TIM1_ClearITPendingBit(TIM1_IT_CC1);    //清除标志位  
  }  
 else if(TIM1_GetITStatus(TIM1_IT_CC2) != RESET) //如果CH2边沿触发  
  {  
      num2 = TIM1_GetCapture2();             //
      TIM1_ClearITPendingBit(TIM1_IT_CC2);    //清除标志位  
      if(flag_send==0)
      {
           LSIDuty = ((num2 * 100) / num1); //计算占空比
           SIClockFreq = 62500/( num1);        //计算频率
          if(LSIClockFreq>=0xff)
         {
             LSIClockFreq=0xff;
         }
     }
  }
}