STM32F4 ADC

void ADCinit_SoftTrigger()      //configurations of adc(sensor) reader
{
    GPIO_InitTypeDef GPIO_InitStructure;
    ADC_InitTypeDef  ADC_InitStructure;
    ADC_CommonInitTypeDef ADC_CommonInitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2 | RCC_APB2Periph_ADC3, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    ADC_CommonInitStructure.ADC_Mode = ADC_DualMode_RegSimult;
    ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
    ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
    ADC_CommonInit(&ADC_CommonInitStructure);

    ADC_InitStructure.ADC_Resolution = ADC_Resolution_10b;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfConversion = 1;

    ADC_Init(ADC2, &ADC_InitStructure);
    ADC_RegularChannelConfig(ADC2, ADC_Channel_2, 1, ADC_SampleTime_3Cycles);

    ADC_Init(ADC3, &ADC_InitStructure);
    ADC_RegularChannelConfig(ADC3, ADC_Channel_3, 1, ADC_SampleTime_3Cycles);

    ADC_Cmd(ADC2, ENABLE);
    ADC_Cmd(ADC3, ENABLE);
}

// for read ADC_pins
uint16_t ADC_read(ADC_TypeDef* ADCX,uint8_t channel,uint8_t ADC_SampleTime){
    ADC_RegularChannelConfig(ADCX,channel,1,ADC_SampleTime);
    ADC_SoftwareStartConv(ADCX);
    while(ADC_GetFlagStatus(ADCX, ADC_FLAG_EOC)==0);
    return ADC_GetConversionValue(ADCX);
}