/******************************************************************************************
Name:       
Function:定时器初始化 TIM3_CH4
Description:       
******************************************************************************************/
void Tim3_CAP_Init(void)
{
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟配置
   
    NVIC_InitTypeDef NVIC_InitStructure; //中断控制器变量
   
    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //NVIC配置
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);  
   
   
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;  
   
    TIM_TimeBaseStructure.TIM_Period = 0;  //不分频
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数
    TIM_TimeBaseStructure.TIM_Period = 0xffffffff;//定时器重装载值
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//时钟分频因子
    TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

   
    TIM_ICInitTypeDef TIM_ICInitStructure;
   
    TIM_ICInitStructure.TIM_Channel = TIM_Channel_4;//通道4
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;//上升沿
    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;//捕获选择
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPSC_DIV1;//捕获分频
    TIM_ICInitStructure.TIM_ICFilter = 0;//捕获滤波
    TIM_ICInit(TIM3,&TIM_ICInitStructure);

    TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;//
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;//下降沿
    TIM_ICInit(TIM3,&TIM_ICInitStructure);

    TIM_Cmd(TIM3,DISABLE);//使能定时器

    TIM_ITConfig(TIM3,TIM_IT_CC4,DISABLE);//使能捕获中断
    TIM_ITConfig(TIM3,TIM_IT_CC3,DISABLE);
}

void Tim3_CAP_Disable(void)
{
    TIM_Cmd(TIM3,DISABLE);//使能定时器
    TIM_ITConfig(TIM3,TIM_IT_CC4,DISABLE);//使能捕获中断  
  TIM_ITConfig(TIM3,TIM_IT_CC3,DISABLE);

}

void Tim3_CAP_Enable(void)
{
//    TDAT_GPIO_Capture();  //引脚设置输入捕获
    Measure_Counts =0;
    TIM3->CCR4 = 0;
    TIM3->CCR3 = 0;//清零
    TIM_Cmd(TIM3,ENABLE);   
    TIM_ITConfig(TIM3,TIM_IT_CC4,ENABLE);  
  TIM_ITConfig(TIM3,TIM_IT_CC3,ENABLE);
}


unsigned char flag_capture =0;
unsigned int capture_value0 =0,capture_value1=0,capture_value2=0;

unsigned int difference_value_period=0;
unsigned int difference_value_dutycycle=0;

unsigned int Freq_InputCapture[32];
unsigned int DutyCycle_InputCapture[32];
unsigned int Measure_Counts =0;
/******************************************************************************************
Name:       
Function:中断函数
Description:       
******************************************************************************************/
void TIM3_IRQHandler(void)
{
    //上升沿，算频率
    if(TIM_GetITStatus(TIM3,TIM_IT_CC4)!= RESET)
    {
        TIM_ClearITPendingBit(TIM3,TIM_IT_CC4);
        if(flag_capture == 0)
        {
           capture_value0 = (uint32_t)(TIM3->CCR4);
           flag_capture =1;            
        }
        else if(flag_capture == 1)
        {
            flag_capture =0;
            capture_value2 = (uint32_t)(TIM3->CCR4);
            //计算
            if(capture_value2 > capture_value0)
            {
                difference_value_period = (capture_value2-capture_value0);
                difference_value_dutycycle =capture_value1 - capture_value0;
            }
            else if(capture_value2 < capture_value0)
            {               
                difference_value_period = ((0xffffffff-capture_value0)+capture_value2);
                if(capture_value0 <= capture_value1)
                    difference_value_dutycycle =capture_value1 - capture_value0;
                else
                    difference_value_dutycycle = ((0xffffffff-capture_value0)+capture_value1);           
            }
            else
            {
                difference_value_period =0;
                difference_value_dutycycle = 0;               
            }
            
            Freq_InputCapture[Measure_Counts] = (uint32_t)SystemCoreClock/4/difference_value_period;
            DutyCycle_InputCapture[Measure_Counts] = difference_value_dutycycle*100/difference_value_period;
            Measure_Counts++;
            if(Measure_Counts >=32) Measure_Counts =0;
        }
    }
   
    //捕获下降沿，占空比
    if(TIM_GetITStatus(TIM3,TIM_IT_CC3)!= RESET)
    {
        TIM_ClearITPendingBit(TIM3,TIM_IT_CC3);
        if(flag_capture == 1)
        {
            capture_value1 = (uint32_t)(TIM3->CCR3);
        }
    }
}