#include <avr/io.h>
#include <util/delay.h>
 
int main()
{
  // OC1A auf Ausgang
	DDRB = (1 << PB1 )|(1 << PB2)|(1 << PB3);
 
  //
  // Timer 1 einstellen
  //  
  // Modus 1:
  //    Set 8 bit Phase correct PWM Mode for channel 1 + 2(A/B)
  //
  //     WGM13    WGM12   WGM11    WGM10
  //      0        0       0        1
  //
  //    Timer Vorteiler: 1
  //     CS12     CS11    CS10
  //       0        0       1
  //
  //  Aktivierung der Ausgangsports: Set at BOTTOM, Clear at match
  //     COM1A1   COM1A0	COM1B1   COM1B0 
  //       1        0			1        0
 
	TCCR1A = (1<<COM1A1) | (1 << COM1B1)| (1<<WGM10);
	TCCR1B = (1 << CS10);


  //
  // Timer 2 einstellen
  //
  // Set 8 bit phase correct PWM Mode
  // 	WGM20		WGM21
  //	  1			  0
  //
  // Clock select channel 3
  // 	CS20		CS21
  //	  1			  0
  //
  // Connect output Pin channel 3
  // 	COM20		COM21
  //	  0			  1

	TCCR2 |=  (1 << WGM20) | (1 << CS20) | (1 << COM21);
	TCCR2 |= (1 << CS20);


  // Durch Verändern der Werte OCR1A, OCR1B und OCR2 werden die Werte der
  // drei Kanäle eingestellt


	int counter1 = 0x1;
	int counter2 = 0xFF;
	OCR1A = counter1;
	OCR1B = counter2;
	OCR2 = counter1;

	while( 1 )
	{
		while (counter1 < 0xFF)
		{
			counter1 = (counter1 << 1) | 1;
			counter2 = (counter2 >> 1);
			OCR1A = 0xFF-counter1;
			OCR1B = 0xFF-counter2;
			OCR2 = 0xFF-counter1;
			_delay_ms(70);
		}
		while (counter1 > 0)
		{
			counter1 = (counter1 >> 1);
			counter2 = (counter2 << 1) | 1;
			OCR1A = 0xFF-counter1;
			OCR1B = 0xFF-counter2;
			OCR2 = 0xFF-counter1;
			_delay_ms(70);
		}
	}  
}