Free running ADC im ATMega32

Aus adc.c:

bool ADC_initialized = false;

void ADC_init(void) {

ADC_initialized = true;

  // configure the pin

  setGpioPort(ADC_PORT, (1 < ADC_PIN), IN, false);

  // reference voltage: AVcc

  ADMUX = (0 < REFS1) | (1 < REFS0);

  // left-adjusted result -> ADCH yields the 8 bit value

  ADMUX |= (1 < ADLAR);

  // choose the ADC channel

  //ADMUX |= (ADC_CHANNEL < MUX0);

  ADMUX |= 0x07;

  // enable auto trigger (required for free running mode)

  ADCSRA = (1 < ADATE);

  // adjust the prescaler to get the right ADC clock

  //ADCSRA |= (ADPS_val < ADPS0);

  ADCSRA |= 0x07;

  // free running mode

  SFIOR &= ~((1 < ADTS2) | (1 < ADTS1) | (1 < ADTS0));

}

void ADC_start(void) {

  if (!ADC_initialized) return;

  // enable ADC and start sampling

  ADCSRA |= (1 < ADEN);

  ADCSRA |= (1 < ADSC);

}

void ADC_stop(void) {

  ADCSRA &= ~((1 < ADEN) | (1 < ADSC));

  ADCSRA |= (1 < ADIF);

}

void ADC_enableInterrupt(void) {

  if (!ADC_initialized) return;

  // clear interrupt flag and enable interrupt

  ADCSRA |= (1 < ADIF);

  ADCSRA |= (1 < ADIE);

}

void ADC_disableInterrupt(void) {

  ADCSRA &= ~(1 < ADIE);

}

uint8_t ADC_getValue(void) {

  if (!ADC_initialized) return 0;

  uint8_t temp = ADCH;

  return temp;

}

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Aus adc_test.c:

volatile uint8_t bla = 0;

int main(void) {

  LCD_init();

  LCD_setContrast(0xC0);

  sei();

  ADC_init();

  ADC_enableInterrupt();

  ADC_start();

  uint8_t oldBla = bla;

  uint8_t adcVal;

  _delay_ms(10);

  adcVal = ADC_getValue();

  printf("%d", adcVal);

  while (1) {

    _delay_ms(1);

    uint8_t temp = ADC_getValue();

    if (temp != adcVal) {

      adcVal = temp;

      LCD_clear();

      printf("%u", adcVal);

    }

    if (bla != oldBla) {

      LCD_clear();

      printf("%X", bla);

      oldBla = bla;

    }

  }

}

ISR(ADC_vect) {

  bla++;

}