基于STM32的智能学习空调项目的定时器捕获驱动

/*************************************************************************************************************************
* 函数 : TIM3.C
* 功能 : 红外信号捕获和发射
* 参数 : 无
* 返回 : 无
* 依赖 : 底层读写函数
* 作者 : li_qcxy@126.com
* 时间 : 2016-4-9
* 最后修改时间 : 
* 说明 : 
* 参考 ：

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

voidIRDA_GPIO_Init(void)
{
 
 GPIO_InitTypeDef  GPIO_InitStructure;
 
//LED1 LED2
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能PA,PD端口时钟
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能PA,PD端口时钟

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11|GPIO_Pin_12; //
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度为50MHz
 GPIO_Init(GPIOA, &GPIO_InitStructure); //根据设定参数初始化GPIOA.8
 
 GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_6;  //PA6 清除之前设置  
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_Init(GPIOA, &GPIO_InitStructure);

 GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_5;  //PA6 清除之前设置  
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_Init(GPIOA, &GPIO_InitStructure);
 
 GPIO_SetBits(GPIOA,GPIO_Pin_5); //PA.8 输出高
 
 GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_10 | GPIO_Pin_11;  //PA6 清除之前设置  
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_Init(GPIOB, &GPIO_InitStructure);
 
// 看门狗SP706 输入脚PA7
 GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_7;  //PA7 清除之前设置  
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void TIM3_Int_Init(u16 arr,u16 psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_ICInitTypeDef  TIM_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;


RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能


TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值计数到5000为500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  10Khz的计数频率  
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
 
  TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
  TIM_ICInitStructure.TIM_ICFilter = 0x0;
  TIM_ICInit(TIM3, &TIM_ICInitStructure);

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;  //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器


TIM_ITConfig(TIM3,TIM_IT_CC1,DISABLE);//不允许CC1IE捕获中断
TIM_ITConfig(TIM3,TIM_IT_Update,DISABLE);//不允许更新中断


TIM_Cmd(TIM3,DISABLE); //使能定时器3
  
}




void TIM_Polarityset(u8 Polarity)
{
 if(Polarity == 0) TIM3->CCER &= ~(1<<1);  //上升
 else TIM3->CCER |= 1<<1;                 //下降

}

void TIM3_IRQHandler(void)   //TIM3中断
{
 if(TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源 
 {
TIM_ClearITPendingBit(TIM3,TIM_IT_Update );  //清除TIMx的中断待处理位:TIM 中断源 
  switch(Timer3)
  {
   case 0:
   {
    Timer3++;
    if(u8Lev == 0x0) GPIO_SetBits(GPIOA,GPIO_Pin_5);
    else GPIO_ResetBits(GPIOA,GPIO_Pin_5);
    break;
   }
   case 1:
   {
    Timer3++;
    GPIO_SetBits(GPIOA,GPIO_Pin_5);
    break;
   }
   case 2:
   {
    Timer3 = 0;
    Timer_PWM++;
    if(Timer_PWM >= Capture)
    {
     Capture =  u16P[u16Pcn++];
     if(Capture == 0xffff)  //输出结束
     {
      TIM_ITConfig(TIM3,TIM_IT_Update,DISABLE);
      TIM_Cmd(TIM3,DISABLE);
      GPIO_SetBits(GPIOA,GPIO_Pin_5);
irad_launch = 1;
      u8FSMirda = IRDA_FSM_DILE;
     }
     else
     {
      u8Lev = ~u8Lev;
      Timer_PWM = 0;
     }
    }
    break;
   }
   default:
   {
    Timer3 = 0;
   }
  }
  
 }

 if(TIM_GetITStatus(TIM3, TIM_IT_CC1) == SET) 
  {
    //TIM_ICInitTypeDef  TIM_ICInitStructure;
    /* Clear TIM3 Capture compare interrupt pending bit */
    TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);
    u8Timerirda = 0;
    if(CaptureNumber == 0)
    {
      /* Get the Input Capture value */
      IC3ReadValue1 = TIM_GetCapture1(TIM3);
      CaptureNumber = 1;
      u8Lev = 0xff;
    }
    else if(CaptureNumber == 1)
    {
      /* Get the Input Capture value */
      IC3ReadValue2 = TIM_GetCapture1(TIM3); 
      
      /* Capture computation */
      if (IC3ReadValue2 > IC3ReadValue1)
      {
        Capture = (IC3ReadValue2 - IC3ReadValue1); 
      }
      else
      {
        Capture = ((0xFFFF - IC3ReadValue1) + IC3ReadValue2); 
      }
      u16P[u16Pcn++] = Capture;
      IC3ReadValue1 = IC3ReadValue2;
      
      /* Frequency computation */ 
      //TIM3Freq = (uint32_t) SystemCoreClock / Capture;
      //CaptureNumber = 0;
    }
  u8Lev = ~u8Lev;  
  TIM_Polarityset(u8Lev);  
  }
}