Микроконтроллеры

unsigned char adc_values[6];
unsigned char adc_channel;
unsigned char adc_ready=0;

void AdcConfiguration(void)
{
  ADCSRA =
    (1 << ADEN) |  //ADC ON,
  //     ADSC     not start conversion
  //    ADATE     auto trigger disable
    (1 << ADIF) |  // clear conversion flag writing 1 to it
  //    ADIE     interrupt disable
    (1 << ADPS2) |   //prescaler =64 (ADPS2=1, ADPS1=1, ADPS0=0)
    (1 << ADPS1) |
  //    ADPS0
    0;

  ADMUX = //REFS1 |
    (1 << REFS0) |  // REFerence = AVCC with C on pin Vref (REFS1=0, REFS0=1)
    (1 << ADLAR) |  // left adjust results - read high byte only
    0;
}

#define ADCoff  	ADCSR=0

#define SetAdcChannel(mux) ADMUX = (0xE0 & ADMUX) | (mux)
#define StartAdcConversion() ADCSRA |= (1 << ADIF) | (1 << ADSC)
#define AdcConversionComplete (!(ADCSRA & (1 << ADSC)))

void AdcService(void)
{
  static char adc_status;

  switch (adc_status)
  {
  case 0:
    AdcConfiguration();
    SetAdcChannel(adc_channel = 0);
    StartAdcConversion();
    adc_status = 1;
    break;
  case 1:
    if (AdcConversionComplete)
    {
      adc_values[adc_channel] = ADCH;
      if (++adc_channel >= COUNT_ELEMENTS(adc_values))
      {
        adc_channel = 0;
        adc_ready = 1;
      }
      SetAdcChannel(adc_channel);
      StartAdcConversion();
    }
    break;
  default:
    adc_status = 0;
  }
}