用STM32F411进行双ADC采样，ADC1 采样8路数据，DMA传输，因为ADC2不能DMA，所以就想直接读取，现在ADC1 8路DMA是没问题的，ADC2却始终没有数据。一整天了，翻遍了国内国外的各大论坛，有一些单ADC多通道的，但没有双ADC多通道的，STM32F1系列倒是有双ADC的，但要用到CDR寄存器，而在STM32F4中貌似并没有这个寄存器，不知道该如何操作，手册Datasheet也看了N遍，水平有限实在搞不定了故发帖求助。还望大神点拨一下，代码如下：

void RCC_Config(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA|RCC_AHB1Periph_DMA2,ENABLE);
}
void DMA_Config(void)
{
        while (DMA_GetCmdStatus(&DMA_Streamx) != DISABLE){}//等待 DMA 可配置

    DMA_InitStructure.DMA_Channel = DMA_Channel_0;  
    DMA_InitStructure.DMA_PeripheralBaseAddr =(uint32_t)ADC1_DR_Address;  //ADC1 DATA ADDRESS
    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&AD_Value;    //DMA memory base address
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//
    DMA_InitStructure.DMA_BufferSize =8; //
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;//
    DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
    DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    DMA_Init(DMA2_Stream0, &DMA_InitStructure);
    DMA_Cmd(DMA2_Stream0, ENABLE);
}

void Gpio_Config(void)
{
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_InitStructure.GPIO_Pin = (uint16_t)0x00FF;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_Init(GPIOA,&GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;//PB0 ADC2
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
}

void ADC_Config(void)
{
  //ADC common
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
  ADC_CommonInitStructure.ADC_Mode = ADC_DualMode_RegSimult;
  //ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
  ADC_CommonInit(&ADC_CommonInitStructure);

  //ADC1
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_NbrOfConversion = 8;
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;
  ADC_Init(ADC1,&ADC_InitStructure);

  ADC_RegularChannelConfig(ADC1,ADC_Channel_0,1,ADC_SampleTime_15Cycles);
  ADC_RegularChannelConfig(ADC1,ADC_Channel_1,2,ADC_SampleTime_15Cycles);
  ADC_RegularChannelConfig(ADC1,ADC_Channel_2,3,ADC_SampleTime_15Cycles);
  ADC_RegularChannelConfig(ADC1,ADC_Channel_3,4,ADC_SampleTime_15Cycles);
  ADC_RegularChannelConfig(ADC1,ADC_Channel_4,5,ADC_SampleTime_15Cycles);
  ADC_RegularChannelConfig(ADC1,ADC_Channel_5,6,ADC_SampleTime_15Cycles);
  ADC_RegularChannelConfig(ADC1,ADC_Channel_6,7,ADC_SampleTime_15Cycles);
  ADC_RegularChannelConfig(ADC1,ADC_Channel_7,8,ADC_SampleTime_15Cycles);

  //ADC2
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 1;
  ADC_Init(ADC2, &ADC_InitStructure);         

  ADC_RegularChannelConfig(ADC2,ADC_Channel_8,1,ADC_SampleTime_15Cycles);

  ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);  //if not have this function , can't get new value
   /* Enable ADC1 DMA */
  ADC_DMACmd(ADC1, ENABLE);  //make enable ADC1 WITH DMA2
  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);
  ADC_Cmd(ADC2, ENABLE);
}

void init_ADC(void)
{
        RCC_Config();
        Gpio_Config();
        ADC_Config();
        DMA_Config();
       
        ADC_SoftwareStartConv(ADC1);
        ADC_SoftwareStartConv(ADC2);
}


ADC2的1路数据读取用 ADC_GetConversionValue(ADC2);