static void GPIO_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    /* Enable the GPIOA Clock */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

    /* Configure PA.1 (ADC Channel1) & PA.4 (ADC Channel4) in analog mode */
    GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_1 | GPIO_Pin_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_Speed= GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}

static void DMA_Config(void)
{
    DMA_InitTypeDef DMA_InitStructure;

    /* Enable DMA1 clock */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
    //DMA1通道1配置
    DMA_DeInit(DMA1_Channel1);
    //外設地址
    DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_ADDRESS;
    //記憶體地址
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&RegularConvertedAdcValue;
    //DMA傳輸方向單向
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    //設定DMA在傳輸時緩衝區的長度
    DMA_InitStructure.DMA_BufferSize = 2;
    //設定DMA的外設遞增模式，一個外設
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    //設定DMA的記憶體遞增模式
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    //外設資料字長
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    //記憶體資料字長
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    //設定DMA的傳輸模式：連續不斷的迴圈模式
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    //設定DMA的優先級別
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    //設定DMA的2個memory中的變數互相訪問
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

    DMA_Init(DMA1_Channel1, &DMA_InitStructure);

    /* Enable DMA1 Channel1 */
    DMA_Cmd(DMA1_Channel1, ENABLE);
}

static void ADC_Config(void)
{
    ADC_InitTypeDef  ADC_InitStructure;

    /* ADC1 DeInit */
    ADC_DeInit(ADC1);

    /* Load ADC default value */
    ADC_StructInit(&ADC_InitStructure);

    /* Enable ADC1 clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    //轉換解析度
    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
    //連續轉換
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    //外部觸發禁止
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    //ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_TRGO;
    //資料右對齊
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    //掃描方向
    ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;

    ADC_Init(ADC1, &ADC_InitStructure);

    /* ADC1 regular channel1 configuration */
    ADC_ChannelConfig(ADC1, ADC_Channel_1, ADC_SampleTime_55_5Cycles);
    ADC_ChannelConfig(ADC1, ADC_Channel_4, ADC_SampleTime_55_5Cycles);

    /* ADC Calibration */
    ADC_GetCalibrationFactor(ADC1);

    /* ADC DMA request in Circular mode */
    ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);

    /* Enable ADC DMA request */
    ADC_DMACmd(ADC1, ENABLE);

    /* Enable ADC1 */
    ADC_Cmd(ADC1, ENABLE);

    /* Wait until the ADC enable falg is set to start conversion */
    while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));

    /* Start ADC1 Software Conversion */
    ADC_StartOfConversion(ADC1);
}