STM32F4 Analogeingänge nicht unabhängig

static void Init_ADC1()

{

  GPIO_InitTypeDef GPIO_InitStructure;

  ADC_InitTypeDef ADC_InitStructure;

  ADC_CommonInitTypeDef ADC_CommonInitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

  /* Configure ADC1 Channel1 Channel2 Channel3 pin as analog input ******************************/

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* ADC Common Init **********************************************************/

  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;

  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;

  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;

  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;

  ADC_CommonInit(&ADC_CommonInitStructure);

  /* ADC1 Init ****************************************************************/

  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;

  ADC_InitStructure.ADC_ScanConvMode = DISABLE; //DISABLE

  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //ENABLE

  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;

  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

  ADC_InitStructure.ADC_NbrOfConversion = 2;

  ADC_Init(ADC1, &ADC_InitStructure);

  ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_3Cycles);

  ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_3Cycles);

  ADC_Cmd(ADC1, ENABLE); 

  ADC_SoftwareStartConv(ADC1); 

}

uint16_t Get_VoltageADC1_Channel_1(uint32_t samples)

{

  uint32_t value=0;

  int i=0;

  ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_15Cycles);

  for(i=0;i<samples;i++)

  {

    ADC_SoftwareStartConv(ADC1);

    while(ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC) != SET)

    {

    }

    value += ADC_GetConversionValue(ADC1);

  }

  return (value/samples);

}