Atmel Studio入門：ADC

//Example: ADC
//Target Device: ATmega328
//Author: easy labo
//Created: 2014.11.02

#include 

void InitAdc(void){
   
   //Clear or AREF Internal Vref turned off,
   ADMUX &= ~(0b11000000);
   //AVCC with external capacitor at AREF pin,
   ADMUX |= 0b01000000;
   //Internal 1.1V Voltage Reference with external capacitor at AREF pin
   //ADMUX |= 0b11000000;
   
   //set ADLAR 1 to left adjust the result
   //ADMUX |= 0b00100000;

   //ADCSRA Settings
   //ADEN(ADC Enable) = 1,
   //ADSC(ADC Start Conversion) = 1
   //ADATE(ADC Auto Trigger Enable) = 0
   //ADIF(ADC Interrupt Flag) = 0
   //ADIE(ADC Interrupt Enable) = 0
   //ADPS[2:0](ADC Prescaler Select Bits) = {0,0,0}
   ADCSRA = (1<<aden); didr0="" settings,="" digital="" input="" disable="" register="" 0="" }="" unsigned="" int="" convadc(unsigned="" char="" chad){="" dataadc;="" admux="(ADMUX" &="" 0xf0)="" |="" chad;="" adcsra="" adsc="1:" adc="" start="" conversion="" while(adcsra="" (1<<adsc));="" if="" adlar="0," dataadc="ADCL;" +="(ADCH<<8);">>6);
   //dataADC += (ADCH<<2);
   return dataADC;
}