/************************************************/
/* 				    */
/*     C-Code Feuchtemesser Schaltung	    */
/*				    */
/***********************************************/


#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
#include <stdint.h>
#include <util/delay.h>

#define TAKT 1000000ul


void blinken(void);

int main(void)

{
	//Initialisierung Port
	//DDRA = 0xFE;		// b 1111.1110
	DDRA |= 1<<PA1;
	DDRA |= 1<<PA2;
	DDRA |= 1<<PA3;

	//disable watchdog timer
	wdt_disable();

	//Initialisierung ADC
	ADCSRA = 0xE0; 		// b 1110.0000
	/* ADC enable(1);ADSC (1);ADATE auto trigger(1);ADIF (0);
	no Interrupt(0);Division factor 2(000)*/
	
	ADMUX = 0x00;	// b 0000.0000

	//divide internal masterclock
	CLKPR = 0x83;		// b 1000.0011
	
	//Interrupts
	sei();	// alle Interrupts erlauben

	while(1)

	{
		
		//conversion start
		while(ADCSRA == 0xFF);
		
		if(ADC >= 96)						// rote LED
			
			{
				void blinken (void);
				PORTA = 0xFC;				// b 1111.1100
			}

		else if(ADC > 0x32 && ADC < 0x96)  // gelbe LED
		/* 51 - 150 dezimal */
			{
				void blinken (void);
				PORTA = 0xFA;				// b 1111.1010
			}

		else if(ADC <= 0x32)				// grüne LED
		/*  50dezimal */

			{
				void blinken (void);
				PORTA = 0xF6;				// b 1111.0110
			}
	
	}

	return 0;
}

void blinken(void)

	{
		while(1) 
  		{
    		_delay_ms(250);
    		PORTA |= (1 << PA1);
    		_delay_ms(250);
    		PORTA &= ~(1 << PA1);
  		}
	}