void initDisplay() {
  timerInit();
   
  //Schritt 1:
  //Hoechstwartezeit auf DisplayReset (2.7V -> 40ms)
  timerPause(45);

  //Port Richtung initialisieren
  //alle Ports auf Ausgang gestellt.
  DDRB |= 0xFF;
  
  //Schritt 1 Initialisierug
  //Hoechstwartezeit auf DisplayReset (2.7V -> 40ms)
  timerPause(45);
  PORTB &=~0xFF;
  PORTB &=~ _BV(LCD_RS);
  PORTB &=~ _BV(LCD_RW);
  PORTB &=~ _BV(LCD_D3);
  PORTB &=~ _BV(LCD_D2);
  PORTB |= _BV(LCD_D1);
  PORTB |= _BV(LCD_D0);

  toggle_e1(500);
  toggle_e2(500);
  
  //wait 100 µs
  timerPause(1);
  PORTB &=~0xFF;
  PORTB &=~ _BV(LCD_RS);
  PORTB &=~ _BV(LCD_RW);
  PORTB &=~ _BV(LCD_D3);
  PORTB &=~ _BV(LCD_D2);
  PORTB |= _BV(LCD_D1);
  PORTB |= _BV(LCD_D0);

  toggle_e1(500);
  toggle_e2(500);

  //wait 4.1 ms
  timerPause(10);
  PORTB &=~0xFF;
  PORTB &=~ _BV(LCD_RS);
  PORTB &=~ _BV(LCD_RW);
  PORTB &=~ _BV(LCD_D3);
  PORTB &=~ _BV(LCD_D2);
  PORTB |= _BV(LCD_D1);
  PORTB |= _BV(LCD_D0);

  toggle_e1(500);
  toggle_e2(500);

  //wait 100 µs
  timerPause(1);
  PORTB &=~0xFF;
  PORTB &=~ _BV(LCD_RS);
  PORTB &=~ _BV(LCD_RW);
  PORTB &=~ _BV(LCD_D3);
  PORTB &=~ _BV(LCD_D2);
  PORTB |= _BV(LCD_D1);
  PORTB |= _BV(LCD_D0);

  toggle_e1(500);
  toggle_e2(500);

  //Schritt 2
  //RS = 0; RW = 0; DB7 = 0; DB6=0; DB5= 1; DB4 = 0;
  PORTB &=~ 0xFF;
  PORTB &=~ _BV(LCD_RS);
  PORTB &=~ _BV(LCD_RW);
  PORTB &=~ _BV(LCD_D3);
  PORTB &=~ _BV(LCD_D2);
  PORTB |= _BV(LCD_D1);
  PORTB &=~ _BV(LCD_D0);

  //E1 und E2 setzten um Wert zu übertragen (fuer beide Controler)
  toggle_e1(500);
  toggle_e2(500);
  
  //Schritt 3
  //RS = 0; RW = 0; DB7 = 0; DB6=0; DB5= 1; DB4 = 0;
  PORTB &=~0xFF;
  PORTB &=~ _BV(LCD_RS);
  PORTB &=~ _BV(LCD_RW);
  PORTB &=~ _BV(LCD_D3);
  PORTB &=~ _BV(LCD_D2);
  PORTB |= _BV(LCD_D1);
  PORTB &=~ _BV(LCD_D0);

  toggle_e1(500);
  toggle_e2(500);

  PORTB &=~0xFF;
  PORTB &=~ _BV(LCD_RS);
  PORTB &=~ _BV(LCD_RW);
  PORTB &=~ _BV(LCD_D3);
  PORTB &=~ _BV(LCD_D2);
  PORTB |= _BV(LCD_D1);
  PORTB &=~ _BV(LCD_D0);

  toggle_e1(500);
  toggle_e2(500);

  //Schritt 4
  PORTB &=~0xFF;

  toggle_e1(500);
  toggle_e2(500);
  
  PORTB &=~0xFF;
  PORTB &=~ _BV(LCD_RS);
  PORTB &=~ _BV(LCD_RW);
  PORTB |= _BV(LCD_D3);
  PORTB |= _BV(LCD_D2);
  PORTB |= _BV(LCD_D1);
  PORTB &=~ _BV(LCD_D0);

  toggle_e1(500);
  toggle_e2(500);

  //Schritt 5
  PORTB &=~0xFF;

  toggle_e1(500);
  toggle_e2(500);

  PORTB &=~0xFF;
  PORTB &=~ _BV(LCD_RS);
  PORTB &=~ _BV(LCD_RW);
  PORTB &=~ _BV(LCD_D3);
  PORTB |= _BV(LCD_D2);
  PORTB |= _BV(LCD_D1);
  PORTB &=~ _BV(LCD_D0);

  toggle_e1(500);
  toggle_e2(500);

  //Schritt6
  PORTB &=~0xFF;
  PORTB |= _BV(LCD_RS);
  PORTB &=~ _BV(LCD_RW);
  PORTB &=~ _BV(LCD_D3);
  PORTB |= _BV(LCD_D2);
  PORTB &=~ _BV(LCD_D1);
  PORTB &=~ _BV(LCD_D0);
  
  toggle_e1(500);
  toggle_e2(500);

  PORTB &=~0xFF;
  PORTB |= _BV(LCD_RS);
  PORTB &=~ _BV(LCD_RW);
  PORTB |= _BV(LCD_D3);
  PORTB &=~ _BV(LCD_D2);
  PORTB &=~ _BV(LCD_D1);
  PORTB &=~ _BV(LCD_D0);
 
  toggle_e1(500);
  toggle_e2(500);
}

void toggle_e1 (int wait) {
  
  PORTB |= _BV(LCD_E1);
  delay(5000);
  PORTB &=~ _BV(LCD_E1);
  timerPause(1000);
}

void toggle_e2 (int wait) {
  
  PORTB |= _BV(LCD_E2);
  delay(5000);
  PORTB &=~ _BV(LCD_E2);
  timerPause(1000);
}