#include <avr/io.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>

#define F_CPU 1000000

#include <util/delay.h>

#define LED_LIGHT 1
#define LED_VCC_WARNING 4


void Test_LED_toggle() {
	PORTB ^= (1 << LED_LIGHT);	
}

void Full_Light() {
	PORTB |= (1 << LED_VCC_WARNING);					// red on blue 0ff
}

void Half_Light() {
	PORTB |=  (1 << LED_LIGHT);							// blue on red off
	PORTB &= ~(1 << LED_VCC_WARNING);													
}

void SOS() {
	PORTB |= (1 << LED_VCC_WARNING);					// rot blau an 							
}

void Flash_Light_1()	{
	_delay_ms(2000);									// blinc
	PORTB |=  (1 << LED_LIGHT);														
	_delay_ms(500);
	PORTB &= ~(1 << LED_LIGHT);														
	_delay_ms(500);
	PORTB &= ~(1 << LED_VCC_WARNING);											
}

int main(void) {
	uint8_t	Light_mode=0;

	// setting i/o ports
	PORTB |= (1 << PB2);				// PB2 pull up
	DDRB   = (1 << PB4) | (1<< PB1);	// PB1 and PB4 output
		
	Full_Light();																
		
	// setting interrupt
	GIMSK |= (1<<INT0);			// ext. interrupt enable
	MCUCR |= (1<<ISC01);		// Trigger INT0 on falling edge
	GIFR   = (1<<INT0);			// clear INT0
	sei();	
																			
	while (1) {
		set_sleep_mode(SLEEP_MODE_IDLE);
		sleep_mode();

		Light_mode++;
		if (Light_mode >= 4) Light_mode=0;

		switch(Light_mode) {
			case 0:	Full_Light(); 	 break;
			case 1:	Half_Light(); 	 break;
			case 2: SOS(); 			 break;				
			case 3: Flash_Light_1(); break;
		}		
	}
}

ISR(INT0_vect) {
	_delay_ms(100);  		// button debounce
	GIFR = (1<<INT0);		// clear INT0
}