請問有關於兩個channel的ADC讀取問題

sappppp 提问时间：2015-12-2 15:09 /

想要請問，我有兩個Channel的ADC，第一個Channel : ADC1  IN11  PC1 和另一個Channel: ADC1 IN12  PC2，但是我在讀取的時後數值一直不對，所以想要請問我的程式是哪裡有問題呢?
謝謝
int main(void)
{
/* System clocks configuration ---------------------------------------------*/
RCC_Configuration();

/* NVIC configuration ------------------------------------------------------*/
NVIC_Configuration();

/* GPIO configuration ------------------------------------------------------*/
GPIO_Configuration();

/* Configure the USART1 */
USART_Configuration1();

/* Configure the ADC */
ADC_Configuration();

/* Configure the DMA */
DMA_Configuration();

while(1)
{
      ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_239Cycles5);
      AD_value = ADC_GetConversionValue(ADC1);

      ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 2, ADC_SampleTime_239Cycles5);
      AD_value2= ADC_GetConversionValue(ADC1);

   if (ticks++ >= 900000)
   {                /* Set Clock1s to 1 every 1 second */
      ticks = 0;
      Clock1s = 1;
      }

   /* Printf message with AD value to serial port every 1 second          */
   if (Clock1s)
   {
      Clock1s = 0;

      printf("The current IA value = 0x%04X \r\n", AD_value );
      printf("The current IB value = 0x%04X \r\n", AD_value2);

   }
   }
}

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOC,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}

void ADC_Configuration(void)
{
/* ADC1 configuration ------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 2;
ADC_Init(ADC1, &ADC_InitStructure);

/* ADC1 regular channel14 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_55Cycles5);       //通道11采样时间
ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 2, ADC_SampleTime_55Cycles5);       //通道12采样时间

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

/* Enable ADC1 reset calibaration register */
ADC_ResetCalibration(ADC1);                                                                                                       //允许ADC1复位校准寄存器
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));                                                                         //检测校准寄存器是否复位完成

   /* Start ADC1 calibaration */
ADC_StartCalibration(ADC1);                                                                                                       //启动ADC1 校准
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));                                                                            //检测校准是否完成

/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);                                                                                           //允许ADC1进行DMA传送

      /* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);                                                                               //软件触发启动ADC1转换
}

void DMA_Configuration(void)
{
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;                //DMA 外设 ADC 基地址
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC1_ConvertedValue; // //DMA 内存基地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
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_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_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);

/* Enable DMA channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE);

}