Sorry für die Ergänzung: es muss noch der Controller definiert werden und der MCU-Takt. Ein Ausschnitt aus (m)einer lauffähigen lcdxy.h für ein 2x24-Display, einem KS0073 und einen 4-Bit-Anschluss (4-bittig, das ist mein Standard) lautet daher so:
Code:
/** 
 *  @name  Definitions for MCU Clock Frequency
 *  Adapt the MCU clock frequency in Hz to your target. 
 */
#define XTAL 20000000              /**< clock frequency in Hz, used to calculate delay timer */


/**
 * @name  Definition for LCD controller type
 * Use 0 for HD44780 controller, change to 1 for displays with KS0073 controller.
 */
#define LCD_CONTROLLER_KS0073 1  /**< Use 0 for HD44780 controller, 1 for KS0073 controller */

/** 
 *  @name  Definitions for Display Size 
 *  Change these definitions to adapt setting to your display
 */
#define LCD_LINES           2     /**< number of visible lines of the display */
#define LCD_DISP_LENGTH    24     /**< visibles characters per line of the display */
//#define LCD_LINE_LENGTH  0x40     /**< internal line length of the display    */
#define LCD_START_LINE1  0x00     /**< DDRAM address of first char of line 1 */
#define LCD_START_LINE2  0x40     /**< DDRAM address of first char of line 2 */
#define LCD_START_LINE3  0x14     /**< DDRAM address of first char of line 3 */
#define LCD_START_LINE4  0x54     /**< DDRAM address of first char of line 4 */
#define LCD_WRAP_LINES      0     /**< 0: no wrap, 1: wrap at end of visibile line */


#define LCD_IO_MODE      1         /**< 0: memory mapped mode, 1: IO port mode */
#if LCD_IO_MODE
/**
 *  @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         PORTB        /**< 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    3            /**< pin for 4bit data bit 1  */
#define LCD_DATA2_PIN    2            /**< pin for 4bit data bit 2  */
#define LCD_DATA3_PIN    1            /**< pin for 4bit data bit 3  */
#define LCD_RS_PORT      PORTC        /**< port for RS line         */
#define LCD_RS_PIN       2            /**< pin  for RS line         */
#define LCD_RW_PORT      PORTC        /**< port for RW line         */
#define LCD_RW_PIN       1            /**< pin  for RW line         */
#define LCD_E_PORT       PORTC        /**< port for Enable line     */
#define LCD_E_PIN        0            /**< pin  for Enable line     */
Änderungsbeispiel: Hast Du aus welchen Gründen auch immer, den LCD-Data1pin auf PORT D2, dann heisst diese Liste so:

Code:
#define LCD_PORT         PORTB        /**< port for the LCD lines   */
#define LCD_DATA0_PORT   LCD_PORT     /**< port for 4bit data bit 0 */
#define LCD_DATA1_PORT   PORTD        /**< 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    2            /**< pin for 4bit data bit 1 = PD2 !!  */
#define LCD_DATA2_PIN    2            /**< pin for 4bit data bit 2  */
#define LCD_DATA3_PIN    1            /**< pin for 4bit data bit 3  */
#define LCD_RS_PORT      PORTC        /**< port for RS line         */
#define LCD_RS_PIN       2            /**< pin  for RS line         */
#define LCD_RW_PORT      PORTC        /**< port for RW line         */
#define LCD_RW_PIN       1            /**< pin  for RW line         */
#define LCD_E_PORT       PORTC        /**< port for Enable line     */
#define LCD_E_PIN        0            /**< pin  for Enable line     */
Viel Erfolg