转抄代码 GP2Y1014AU_gp2y1014auof 280us

void GP2Y_ADC_init() {       
GPIO_InitTypeDef GPIO_InitStructure; 
ADC_InitTypeDef ADC_InitStructure;        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOF|RCC_APB2Periph_AFIO|RCC_APB2Periph_ADC3,ENABLE);    RCC_ADCCLKConfig(RCC_PCLK2_Div6);//12M  最大14M 设置ADC时钟（ADCCLk)
 ADC_DeInit(ADC3);
 GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6;//ADC
 GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;        //模拟输入
 GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
 GPIO_Init(GPIOF,&GPIO_InitStructure);
 ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
 ADC_InitStructure.ADC_ScanConvMode = DISABLE;
 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
 ADC_InitStructure.ADC_ExternalTrigConv =
 ADC_ExternalTrigConv_None;
 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
 ADC_InitStructure.ADC_NbrOfChannel = 4;
 ADC_Init(ADC3, &ADC_InitStructure);  //设置指定ADC的规则组通道，设置它们的转化顺序和采样时间ADC_RegularChannelConfig(ADC1,ADC_Channel_1,1,ADC_SampleTime_239Cycles5);   //内部温度传感器是在ADC1通道16的
 ADC_RegularChannelConfig(ADC3,ADC_Channel_4,1,ADC_SampleTime_239Cycles5); //
 ADC_TempSensorVrefintCmd(ENABLE);//打开内部温度传感器使能       
  ADC_Cmd(ADC3,ENABLE);       
  ADC_ResetCalibration(ADC3);//重置指定的ADC的校准寄存器       
    while(ADC_GetResetCalibrationStatus(ADC3));//获取ADC重置校准寄存器的状态                  
    ADC_StartCalibration(ADC3);//开始指定ADC的校准状态         
    while(ADC_GetCalibrationStatus(ADC3));//获取指定ADC的校准程序         
     ADC_SoftwareStartConvCmd(ADC3, ENABLE);//使能或者失能指定的ADC的软件转换启动功能         
     GPIO_SetBits(GPIOC, GPIO_Pin_2);//置1


     u16   GetGP2YAverageValue(u8 times) 
     {   
       u32 temp_val=0;   
       u8 t;  
       for(t=0;t<times;t++)     
       {         
            temp_val+=GetGP2YSingleValue();   
        }   
         return temp_val/times; 
         }  
         u16 GetGP2YSingleValue(void) 
         {               
                  int samplingTime = 280;//等待LED开启的时间是280μs                
                   int deltaTime = 40;//整个脉冲持续时间为320μs。因此，我们还需再等待40μs                         
                    uint16_t ADCVal;                
                    float dustVal = 0;                
                    float Voltage;                          
                    GPIO_ResetBits(GPIOC, GPIO_Pin_2);//置1  开启内部LED  ????????                 
                     delay_us(samplingTime);                                         
                      // 开启LED后的280us的等待时间                                  
                      ADC_SoftwareStartConvCmd(ADC3, ENABLE);     
                      while(!ADC_GetFlagStatus(ADC3，ADC_FLAG_EOC));               
                        ADCVal = ADC_GetConversionValue(ADC3);                          delay_us(40);              
                        GPIO_SetBits(GPIOC, GPIO_Pin_2);//置0                 delay_us(9680);//需要脉宽比0.32ms/10ms的PWM信号驱动传感器中的LED              
                         Voltage = ADCVal * 3.3 / 4096; 
                         dustVal = (Voltage + 1) * 1000 / 10;//*1000作用是将单位转换为ug/m3 //               
                          if(ADCVal > 36.455) //                       
                          dustVal = ((float)(ADCVal / 1024.0) - 0.0356) * 120000 * 0.035; //               
                           dustVal = 0.17 * ADCVal - 0.1; //                dustVal = ADCVal; //                
                           return dustVal; //                mg/m3                 
                           return dustVal; 
                           }
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