void ADC_Config(void)
{
  CLK_PeripheralClockConfig(CLK_Peripheral_ADC1,ENABLE);         
  
  ADC_DeInit(ADC1);
  
  
  ADC_VrefintCmd(ENABLE);
   
  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);
  
  GPIO_Init(GPIOB,GPIO_Pin_0,GPIO_Mode_In_PU_No_IT);
  
  /* Initialise and configure ADC1 */
  ADC_Init(ADC1, ADC_ConversionMode_Continuous, ADC_Resolution_12Bit, ADC_Prescaler_2);
  
  ADC_SamplingTimeConfig(ADC1, ADC_Group_SlowChannels, ADC_SamplingTime_384Cycles);

  

  /* Enable ADC1 Channel 18 */
// ADC_ChannelCmd(ADC1, ADC_Channel_18, ENABLE);

  ADC_ChannelCmd(ADC1, ADC_Channel_Vrefint, ENABLE);
  
  
  /* Enable End of conversion ADC1 Interrupt */
  ADC_ITConfig(ADC1, ADC_IT_EOC, ENABLE);

  /* Start ADC1 Conversion using Software trigger*/
  ADC_SoftwareStartConv(ADC1);
  
  
  
  
}



/**
* @brief ADC1/Comparator Interrupt routine.
* @param  None
* @retval None
*/
INTERRUPT_HANDLER(ADC1_COMP_IRQHandler,18)
{
  /* In order to detect unexpected events during development,
  it is recommended to set a breakpoint on the following instruction.
  */
  
  ADCdata = ADC_GetConversionValue(ADC1);
  
}