#include <stdio.h>
#include <math.h>
#include <avr/io.h>
#include "hd44780/HD44780.hpp"

#define LED1 PB5    //  LED1 deifnition
#define LED2 PB4    //  LED2 deifnition
#define LED3 PB3    //  LED2 deifnition
#define LED4 PB2    //  LED2 deifnition
#define SW1 PD0 	//  BUTTON deifnition
#define SW2 PD1 	//  BUTTON deifnition
#define SW3 PD2		//  BUTTON deifnition
#define SW4 PD3 	//  BUTTON deifnition
#define ADCIN PC0   //  ADCIN (wejœcie ADC)

void ADC_Init(void);

int main(void)
{
	// IO configuration
	DDRB  |= (1<<LED1) | (1<<LED2) | (1<<LED3) | (1<<LED4);		// configuration of LED pins as outputs
	DDRC &=~ (1<<ADCIN);             // ADC pin as input
	DDRD= 0xff;                      // not used pins in port D as outputs
	DDRD  &=~ (1<<SW1);      	     // button pin as input
	PORTD |=  (1<<SW1);         	 // Pull up button pin

	ADC_Init();
	LCD_Initalize();

	//	main loop
	for(;;)
	{
		// IF is executed when button is pressed
		if(!(PIND & (1<<SW1))){
				LCD_Clear();
				LCD_GoTo(9,0);

				ADCSRA |= (1<<ADSC);		//	ADC - Start Conversion
				while(ADCSRA & (1<<ADSC)); 	//	wait for finish of conversion

				// use ADC register to
				// * display value on the screen
				// * send it to the computer with uart
				// * blink led dependign on the
		}
	}
}

void ADC_Init(void){
	// ADC configuration register
	ADCSRA = (1<<ADEN)|(1<<ADPS0)|(1<<ADPS1)|(1<<ADPS2);
	//ADEN - ADC Enable
	//ADPS2:0 - prescaler (128 in this case)

	// multiplexer selectrion register
	ADMUX  =  (1<<REFS1) | (1<<REFS0);
	//REFSW:0: Reference Selection Bits ->  Internal 1.1V Voltage Reference with external capacitor at AREF pin
	//Input Channel Selections (ADC0 - PC0 )
}