配置如下：
void ADC_INTI(void)
{
  GPIO_InitTypeDef       GPIO_InitStructure;
  DMA_InitTypeDef        DMA_InitStructure;
  ADC_InitTypeDef        ADC_InitStructure;
  ADC_CommonInitTypeDef  ADC_CommonInitStructure;  
  
  /* Enable peripheral clocks *************************************************/
  RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOB , ENABLE);
  RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_DMA2 , ENABLE);
  RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC1 , ENABLE);


  /* Configure ADC Channel 12 pin as analog input *****************************/
  GPIO_InitStructure.GPIO_Pin = ADC12_IN8_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(ADC12_IN8_PORT, &GPIO_InitStructure);

  /* DMA2 Stream0 channel0 configuration **************************************/
        DMA_DeInit(DMA_CHANNELx);
  DMA_InitStructure.DMA_Channel = DMA_CHANNELx;  
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&aADCTripleConvertedValue;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize = 1;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA_STREAMx, &DMA_InitStructure);

  /* DMA2_Stream0 enable */
  DMA_Cmd(DMA_STREAMx, ENABLE);

  /* ADC Common configuration *************************************************/
  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;  
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
  ADC_CommonInit(&ADC_CommonInitStructure);

  /* ADC1 regular channel 12 configuration ************************************/
  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_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 1;
  ADC_Init(ADC1, &ADC_InitStructure);

  ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 1, ADC_SampleTime_3Cycles);
  /* Enable ADC1 DMA */
  ADC_DMACmd(ADC1, ENABLE);

//  /* ADC2 regular channel 12 configuration ************************************/
//  ADC_Init(ADC2, &ADC_InitStructure);
//  /* ADC2 regular channel12 configuration */
//  ADC_RegularChannelConfig(ADC2, ADC_Channel_8, 1, ADC_SampleTime_3Cycles);

//  /* ADC3 regular channel 12 configuration ************************************/
//  ADC_Init(ADC3, &ADC_InitStructure);
//  /* ADC3 regular channel12 configuration */
//  ADC_RegularChannelConfig(ADC3, ADC_Channel_8, 1, ADC_SampleTime_3Cycles);

  /* Enable DMA request after last transfer (multi-ADC mode) ******************/
//  ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);

  /* Enable ADC1 **************************************************************/
  ADC_Cmd(ADC1, ENABLE);
}
我在后边调用aADCTripleConvertedValue的时候一直是一个值，但是ADC的数据寄存器内数值一直在变化，谁能告诉我怎么回事啊？