LCD-Ansteuerung funktioniert nicht

[Spurius]

Hallo,
ich versuche gerade eine eigene LCD-Ansteuerung ohne Lib hinzukriegen, leider wird auf dem Display nicht angezeigt...

#include <inttypes.h>
#include <avr/io.h>
#include <util/delay.h>

#define LCD_RS_PORT PORTB
#define LCD_RS_PIN 3
#define LCD_DATA0_PORT   PORTD     /**< port for 4bit data bit 0 */
#define LCD_DATA1_PORT   PORTD     /**< port for 4bit data bit 1 */
#define LCD_DATA2_PORT   PORTD     /**< port for 4bit data bit 2 */
#define LCD_DATA3_PORT   PORTB     /**< port for 4bit data bit 3 */
#define LCD_DATA0_PIN    5            /**< pin for 4bit data bit 0  */
#define LCD_DATA1_PIN    6           /**< pin for 4bit data bit 1  */
#define LCD_DATA2_PIN    7            /**< pin for 4bit data bit 2  */
#define LCD_DATA3_PIN    0 
#define LCD_RW_PORT      PORTB     /**< port for RW line         */
#define LCD_RW_PIN       4            /**< pin  for RW line         */
#define LCD_E_PORT       PORTB     /**< port for Enable line     */
#define LCD_E_PIN        2            /**< pin  for Enable line     */
#define LCD_E_PORT       PORTB     /**< port for Enable line     */
#define LCD_E_PIN        1            /**< pin  for Enable line     */


		
void write_data(uint8_t wert)
{
 if(wert & (1<<0))
  {
   LCD_DATA0_PORT &=  ~(1 << LCD_DATA0_PIN);
  }
 else
  {
   LCD_DATA0_PORT |=  (1 << LCD_DATA0_PIN);
  }
  
 if(wert & (1<<1))
  {
   LCD_DATA1_PORT &=  ~(1 << LCD_DATA1_PIN);
  }
 else
  {
   LCD_DATA1_PORT |=  (1 << LCD_DATA1_PIN);
  }  
  
 if(wert & (1<<2))
  {
   LCD_DATA2_PORT &=  ~(1 << LCD_DATA2_PIN);
  }
 else
  {
   LCD_DATA2_PORT |=  (1 << LCD_DATA2_PIN);
  }
 if(wert & (1<<3))
  {
   LCD_DATA3_PORT &=  ~(1 << LCD_DATA3_PIN);
  }
 else
  {
   LCD_DATA3_PORT |=  (1 << LCD_DATA3_PIN);
  }
 
}
void init_lcd(void)
{
 _delay_ms(20);
 LCD_RS_PORT &= ~(1<<LCD_RS_PIN);  /* Steuerregister wird angesprochen */
 _delay_ms(8);
 write_data(0x3);
 _delay_ms(1);
 write_data(0x3);
 LCD_RW_PORT |= (1<<LCD_RW_PIN);                /*Lesezugriff, warten bis RW 0 */
 DDRB = 0xfe;           /*PB0 als Eingang, um Busyflag einzulesen*/
 while(LCD_DATA3_PORT & (1<<LCD_DATA3_PIN));  
 LCD_RW_PORT &= ~(1<<LCD_RW_PIN);
 DDRB = 0xff;
 write_data(0x2);    
 LCD_RW_PORT |= ~(1<<LCD_RW_PIN);
 DDRB = 0xfe;
 while(LCD_DATA3_PORT & (1<<LCD_DATA3_PIN));
 LCD_RW_PORT &= (1<<LCD_RW_PIN);
 DDRB = 0xff;
 write_data(0x2);     /*System-Set oberes Nibble */
 write_data(0x8);     /*System-Set unteres Nibble */
 
 write_data(0x0);     /*Display on/off, Display on, Unterstrich Cursor on, blinkender Cursor on*/
 write_data(0xF);
 
 write_data(0x0);   /* Cursor Home */
 write_data(0x2);
 
 LCD_RS_PORT |= (1<<LCD_RS_PIN);  /*Datenregister auswählen*/
 write_data(0x19);
 
 
}

void main(void)
{
 DDRB = 0xFF;
 DDRD = 0xFF;
 init_lcd();
 for(;;);
}

Ich habe versucht nach der Anleitung im PDF zu gehen, aber irgendwie habe ich nie Enable verwendet..

Gruß
Martin