Ohh - das wird mein Fehler sein! Bild  
Ich habe es bisher so angeschlossen, dass der "PC1" auf Pin1 usw. liegt.
Unten das entsprechende Code-Snippet:
Code:
/**
 *  @name Definitions for 4-bit IO mode
 *  Change LCD_PORT if you want to use a different port for the LCD pins.
 *
 *  The four LCD data lines and the three control lines RS, RW, E can be on the 
 *  same port or on different ports. 
 *  Change LCD_RS_PORT, LCD_RW_PORT, LCD_E_PORT if you want the control lines on
 *  different ports. 
 *
 *  Normally the four data lines should be mapped to bit 0..3 on one port, but it
 *  is possible to connect these data lines in different order or even on different
 *  ports by adapting the LCD_DATAx_PORT and LCD_DATAx_PIN definitions.
 *  
 */
#define LCD_PORT         PORTC        /**< port for the LCD lines   */
#define LCD_DATA0_PORT   LCD_PORT     /**< port for 4bit data bit 0 */
#define LCD_DATA1_PORT   LCD_PORT     /**< port for 4bit data bit 1 */
#define LCD_DATA2_PORT   LCD_PORT     /**< port for 4bit data bit 2 */
#define LCD_DATA3_PORT   LCD_PORT     /**< port for 4bit data bit 3 */
#define LCD_DATA0_PIN    4            /**< pin for 4bit data bit 0  */
#define LCD_DATA1_PIN    5            /**< pin for 4bit data bit 1  */
#define LCD_DATA2_PIN    6            /**< pin for 4bit data bit 2  */
#define LCD_DATA3_PIN    7            /**< pin for 4bit data bit 3  */
#define LCD_RS_PORT      LCD_PORT     /**< port for RS line         */
#define LCD_RS_PIN       3            /**< pin  for RS line         */
#define LCD_RW_PORT      LCD_PORT     /**< port for RW line         */
#define LCD_RW_PIN       2            /**< pin  for RW line         */
#define LCD_E_PORT       LCD_PORT     /**< port for Enable line     */
#define LCD_E_PIN        1            /**< pin  for Enable line     */
Ich werde es heute Abend mal testen - Danke!
Sollte ich es tatsächlich verwechselt haben, reicht es doch aus, es in der lcd.h jeden Pin um 1 zu erniedrigen. Oder?