#include <avr/io.h>
#include "uart.h"

void init();
//Initalizes UART, ADC.

uint16_t do_adc();
//Starts an ADC conversion on ADC0 (PA0), waits for 
//conversion to finish, and returns 10-bit adc value.

int main(void)
{
	uint16_t adc_value; //Unsigned integer to hold the ADC value.

	init();

	while(1)
	{
		adc_value = do_adc();

		//Add your code here.
	}

	return 0;
}

void init()
{
	//Init ADC. See the ATmega 16 datasheet for more info.
	ADMUX = _BV(REFS0); //Set the ADC voltage reference to AVCC (Analog voltage in)
	ADCSRA = _BV(ADEN) | _BV(ADPS2) | _BV(ADPS1) | _BV(ADPS0); //Enable the ADC and set PS.

	//Init UART
	uart_init();
}

uint16_t do_adc()
{
	//Start an ADC conversion by setting the ADSC bit.
	ADCSRA |= _BV(ADSC);

	//Wait for the conversion to finish. The ADC signals that it's finished
	// by clearing the ADSC bit that we set above.
	while( ADCSRA & _BV(ADSC) )
		; //Do nothing.

	//Return the ADC result from the ADC register.
	return ADC;
}