在做STM32L151 多路AD采集时。
AD的初始化：
void ADC_Config(void)
{
  /* Enable The HSI (16Mhz) */
  RCC_HSICmd(ENABLE);
  
  /* Check that HSI oscillator is ready */
  while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET);
   
  /* Configure RV3 input voltage */

  /* Enable the GPIOF Clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
  
  
  /* Configure PF.11 (ADC channel 1b) or PA.05 (ADC channel 5) in analog mode */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* ADC1 Configuration ------------------------------------------------------*/
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

  /* ADC1 DeInit */  
  ADC_DeInit(ADC1);
  
#ifdef USE_STM32L152D_EVAL
  /* Select ADC Bank channel */
  ADC_BankSelection(ADC1, ADC_Bank_B);
#endif
  
  /* ADC1 Configuration of channel18/31 and channel5/1b : continuous mode, external trigger (TIM2) */
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Falling;
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 2;
  ADC_Init(ADC1, &ADC_InitStructure);

  /* ADC1 Regular Channel Config */
  ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_192Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 2, ADC_SampleTime_192Cycles);

  /* Enables the ADC1 Power Down during Delay */
  ADC_PowerDownCmd(ADC1, ADC_PowerDown_Idle_Delay, ENABLE);
  
  /* Delay until the converted data has been read */
  ADC_DelaySelectionConfig(ADC1, ADC_DelayLength_Freeze);

  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);     
  
  /* Wait until the ADC1 is ready */
  while(ADC_GetFlagStatus(ADC1, ADC_FLAG_ADONS) == RESET)
  {
  }
}
T2的初始化：
void TIM2_Config(void)
{
  /* Enable TIM2 clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

  TIM_DeInit(TIM2);
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 0xFF;         
  TIM_TimeBaseStructure.TIM_Prescaler = 0x1;      
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;   
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  /* TIM2 TRGO selection */
  TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);

  /* Enable TIM2 Update Interrupt*/
  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable TIM2 */      
  TIM_Cmd(TIM2,ENABLE);
}
中断获取数据：
void TIM2_IRQHandler(void)
{
  if(TIM_GetITStatus(TIM2, TIM_IT_Update) == SET)
  {
    iddtmp = ADC_GetConversionValue(ADC1);
    rv3voltagetmp = ADC_GetConversionValue(ADC1);

    /* Clear the TIM2 Update flag */
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);  
  }
}
程序运行后发现iddtmp 和rv3voltagetmp 值是一样的。

发现使用下面的时钟初始化就没有问题：（使用了内部时钟MSI）

使用多路AD采集时，使用内部时钟MSI正常，使用外部时钟HSE时，2路AD采集值一直相同。

请高手指点！！！！！！

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太乱了。