各位大神，帮忙看下下面的6路ADC+_DMA的代码，能出来数值，但是最后的值不对，GND能识别成0V，但是3.3V就被识别成47V.


int main(void)
{
        u32 mar[6] = {0};
        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
        delay_init(168);    //
        uart_init(115200);        //
        LED_Init();
        Adc_Init((u32)mar);        
               
        while(1)
        {
                                if(DMA_GetFlagStatus(DMA2_Stream0,DMA_FLAG_TCIF0)!=RESET)
                                        {
                                        printf("adc0=%f  ",(float)mar[0]*(3.0/4096.0));
                                        printf("adc1=%f  ",(float)mar[1]*(3.0/4096.0));
                                        printf("adc2=%f  ",(float)mar[2]*(3.0/4096.0));
                                        printf("adc3=%f  ",(float)mar[3]*(3.0/4096.0));
                                        printf("adc4=%f  ",(float)mar[4]*(3.0/4096.0));
                                        printf("adc5=%f  ",(float)mar[5]*(3.0/4096.0));                               
        //    printf("adc = %f",temp);
                      printf(" ");               
                                               
                                        DMA_ClearFlag(DMA2_Stream0,DMA_FLAG_TCIF0);
                                        }
                       
                        LED0=!LED0;
                        delay_ms(250);       
        }
}


void  Adc_Init(u32 mar)
{   
  GPIO_InitTypeDef  GPIO_InitStructure;
        ADC_CommonInitTypeDef ADC_CommonInitStructure;
        ADC_InitTypeDef       ADC_InitStructure;
        DMA_InitTypeDef  DMA_InitStructure;
       
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//ê1ÄüGPIOAê±Öó
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //ê1ÄüADC1ê±Öó
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);
       
       
  //Ïè3õê¼»ˉADC1í¨μà5 IO¿ú
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_4|GPIO_Pin_3|GPIO_Pin_2|GPIO_Pin_1|GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//Ä￡Äaêäèë
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;//2»′øéÏÏÂà-
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉ  

        RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE);          //ADC1¸′λ
        RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE);        //¸′λ½áêø         

       
  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_20Cycles;
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;//Ô¤·ÖÆμ4·ÖÆμ
  ADC_CommonInit(&ADC_CommonInitStructure);//3õê¼»ˉ
       
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//12λÄ￡ê½
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;       
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//½ûÖ1′￥·￠¼ì2a￡¬ê1óÃèí¼t′￥·￠
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//óò¶ÔÆë       
  ADC_InitStructure.ADC_NbrOfConversion = 6;
  ADC_Init(ADC1, &ADC_InitStructure);//ADC3õê¼»ˉ
       
        DMA_DeInit(DMA2_Stream0);
        while (DMA_GetCmdStatus(DMA2_Stream0) != DISABLE){}//μè′yDMA¿éÅäÖÃ
       
  /* ÅäÖÃ DMA Stream */
  DMA_InitStructure.DMA_Channel = DMA_Channel_0;  //í¨μàÑ¡Ôñ
  DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&ADC1->DR;//DMAíaéèμØÖ·
  DMA_InitStructure.DMA_Memory0BaseAddr = (u32)mar;//DMA ′æ′￠Æ÷0μØÖ·
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//′æ′￠Æ÷μ½íaéèÄ￡ê½
  DMA_InitStructure.DMA_BufferSize = 6;//êy¾Y′«êäá¿
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//íaéè·ÇÔöá¿Ä￡ê½
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//′æ′￠Æ÷Ôöá¿Ä￡ê½
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;//íaéèêy¾Y3¤¶è:32λ
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;//′æ′￠Æ÷êy¾Y3¤¶è:32λ
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//ÖDμèóÅÏ輶
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//′æ′￠Æ÷í»·￠μ￥′Î′«êä
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//íaéèí»·￠μ￥′Î′«êä
  DMA_Init(DMA2_Stream0, &DMA_InitStructure);//3õê¼»ˉDMA Stream
        DMA_Cmd(DMA2_Stream0,ENABLE);

        ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_144Cycles );
        ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_144Cycles );
        ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_144Cycles );
        ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_144Cycles );
        ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 5, ADC_SampleTime_144Cycles );
        ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 6, ADC_SampleTime_144Cycles );

        ADC_SoftwareStartConv(ADC1);
        ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);       
        ADC_DMACmd(ADC1,ENABLE);
        ADC_Cmd(ADC1, ENABLE);//¿aÆôAD×a»»Æ÷       
}