STM32F103 АЦП

    //ADC
    ADC_InitTypeDef ADC_InitStructure;
    GPIO_InitTypeDef  GPIO_InitStructure;
    // input of ADC (it doesn't seem to be needed, as default GPIO state is floating input)
    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AIN;
    GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_1 ;        // that's ADC1 (PA1 on STM32)
    GPIO_Init(GPIOA, &GPIO_InitStructure);
 
    //clock for ADC (max 14MHz --> 72/6=12MHz)
    RCC_ADCCLKConfig (RCC_PCLK2_Div6);
    // enable ADC system clock
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
 
    // define ADC config
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;  // we work in continuous sampling mode
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
 
    ADC_RegularChannelConfig(ADC1,ADC_Channel_1, 1,ADC_SampleTime_28Cycles5); // define regular conversion config
    ADC_Init ( ADC1, &ADC_InitStructure);   //set config of ADC1
 
    // enable ADC
    ADC_Cmd (ADC1,ENABLE);  //enable ADC1
 
    //  ADC calibration (optional, but recommended at power on)
    ADC_ResetCalibration(ADC1); // Reset previous calibration
    while(ADC_GetResetCalibrationStatus(ADC1));
    ADC_StartCalibration(ADC1); // Start new calibration (ADC must be off at that time)
    while(ADC_GetCalibrationStatus(ADC1));
 
    // start conversion
    ADC_Cmd (ADC1,ENABLE);  //enable ADC1
    ADC_SoftwareStartConvCmd(ADC1, ENABLE); // start conversion (will be endless as we are in continuous mode)
 
    while (1)
    {
 
        adc_value = ADC_GetConversionValue(ADC1);
 
        processADCvalue(adc_value );
    }