#ifndef LCD_H

#define LCD_H


 Title	:   C include file for the HD44780U LCD library (lcd.c)

 Author:    Peter Fleury <pfleury@gmx.ch>  http://jump.to/fleury

 File:	    $Id: lcd.h,v 2006/01/30 19:51:33 peter Exp $

 Software:  AVR-GCC 3.3

 Hardware:  any AVR device, memory mapped mode only for AT90S4414/8515/Mega



 @defgroup pfleury_lcd LCD library

 @code #include <lcd.h> @endcode


 @brief Basic routines for interfacing a HD44780U-based text LCD display

 Originally based on Volker Oth's LCD library,

 changed lcd_init(), added additional constants for lcd_command(), 

 added 4-bit I/O mode, improved and optimized code.


 Library can be operated in memory mapped mode (LCD_IO_MODE=0) or in 

 4-bit IO port mode (LCD_IO_MODE=1). 8-bit IO port mode not supported.

 Memory mapped mode compatible with Kanda STK200, but supports also 

 generation of R/W signal through A8 address line.


 @author Peter Fleury pfleury@gmx.ch http://jump.to/fleury


 @see The chapter <a href="http://homepage.sunrise.ch/mysunrise/peterfleury/avr-lcd44780.html" target="_blank">Interfacing a HD44780 Based LCD to an AVR</a>

      on my home page.



#if (__GNUC__ * 100 + __GNUC_MINOR__) < 303

#error "This library requires AVR-GCC 3.3 or later, update to newer AVR-GCC compiler !"


#include <inttypes.h>

#include <avr/pgmspace.h>


 *  @name  Definitions for MCU Clock Frequency

 *  Adapt the MCU clock frequency in Hz to your target. 

//#define XTAL 4000000              /**< clock frequency in Hz, used to calculate delay timer */

#define XTAL F_CPU


 * @name  Definition for LCD controller type

 * Use 0 for HD44780 controller, change to 1 for displays with KS0073 controller.

#define LCD_CONTROLLER_KS0073 0  /**< Use 0 for HD44780 controller, 1 for KS0073 controller */


 *  @name  Definitions for Display Size 

 *  Change these definitions to adapt setting to your display

#ifndef LCD_LINES

#define LCD_LINES           4     /**< number of visible lines of the display */

#define LCD_DISP_LENGTH    20     /**< 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 */



 *  @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.


#ifndef LCD_D_PORT

#define LCD_PORT         PORTD        /**< 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    3            /**< pin for 4bit data bit 0  */

#define LCD_DATA1_PIN    4            /**< pin for 4bit data bit 1  */

#define LCD_DATA2_PIN    5            /**< pin for 4bit data bit 2  */

#define LCD_DATA3_PIN    6            /**< pin for 4bit data bit 3  */

#define LCD_RS_PORT      LCD_PORT     /**< port for RS line         */

#define LCD_RS_PIN       0            /**< pin  for RS line         */

#define LCD_RW_PORT      LCD_PORT     /**< port for RW line         */

#define LCD_RW_PIN       1            /**< pin  for RW line         */

#define LCD_E_PORT       LCD_PORT     /**< port for Enable line     */

#define LCD_E_PIN        2            /**< pin  for Enable line     */






#define LCD_RS_PORT      LCD_C_PORT

#define LCD_RW_PORT      LCD_C_PORT

#define LCD_E_PORT       LCD_C_PORT


#elif defined(__AVR_AT90S4414__) || defined(__AVR_AT90S8515__) || defined(__AVR_ATmega64__) || \

      defined(__AVR_ATmega8515__)|| defined(__AVR_ATmega103__) || defined(__AVR_ATmega128__) || \
      defined(__AVR_ATmega161__) || defined(__AVR_ATmega162__) || defined(__AVR_AT90USB82__)

 *  memory mapped mode is only supported when the device has an external data memory interface

#define LCD_IO_DATA      0xC000    /* A15=E=1, A14=RS=1                 */

#define LCD_IO_FUNCTION  0x8000    /* A15=E=1, A14=RS=0                 */

#define LCD_IO_READ      0x0100    /* A8 =R/W=1 (R/W: 1=Read, 0=Write   */


#error "external data memory interface not available for this device, use 4-bit IO port mode"



 *  @name Definitions for LCD command instructions

 *  The constants define the various LCD controller instructions which can be passed to the 

 *  function lcd_command(), see HD44780 data sheet for a complete description.


/* instruction register bit positions, see HD44780U data sheet */
#define LCD_CLR               0      /* DB0: clear display                  */

#define LCD_HOME              1      /* DB1: return to home position        */

#define LCD_ENTRY_MODE        2      /* DB2: set entry mode                 */

#define LCD_ENTRY_INC         1      /*   DB1: 1=increment, 0=decrement     */

#define LCD_ENTRY_SHIFT       0      /*   DB2: 1=display shift on           */

#define LCD_ON                3      /* DB3: turn lcd/cursor on             */

#define LCD_ON_DISPLAY        2      /*   DB2: turn display on              */

#define LCD_ON_CURSOR         1      /*   DB1: turn cursor on               */

#define LCD_ON_BLINK          0      /*     DB0: blinking cursor ?          */

#define LCD_MOVE              4      /* DB4: move cursor/display            */

#define LCD_MOVE_DISP         3      /*   DB3: move display (0-> cursor) ?  */

#define LCD_MOVE_RIGHT        2      /*   DB2: move right (0-> left) ?      */

#define LCD_FUNCTION          5      /* DB5: function set                   */

#define LCD_FUNCTION_8BIT     4      /*   DB4: set 8BIT mode (0->4BIT mode) */

#define LCD_FUNCTION_2LINES   3      /*   DB3: two lines (0->one line)      */

#define LCD_FUNCTION_10DOTS   2      /*   DB2: 5x10 font (0->5x7 font)      */

#define LCD_CGRAM             6      /* DB6: set CG RAM address             */

#define LCD_DDRAM             7      /* DB7: set DD RAM address             */

#define LCD_BUSY              7      /* DB7: LCD is busy                    */

/* set entry mode: display shift on/off, dec/inc cursor move direction */
#define LCD_ENTRY_DEC            0x04   /* display shift off, dec cursor move dir */

#define LCD_ENTRY_DEC_SHIFT      0x05   /* display shift on,  dec cursor move dir */

#define LCD_ENTRY_INC_           0x06   /* display shift off, inc cursor move dir */

#define LCD_ENTRY_INC_SHIFT      0x07   /* display shift on,  inc cursor move dir */

/* display on/off, cursor on/off, blinking char at cursor position */
#define LCD_DISP_OFF             0x08   /* display off                            */

#define LCD_DISP_ON              0x0C   /* display on, cursor off                 */

#define LCD_DISP_ON_BLINK        0x0D   /* display on, cursor off, blink char     */

#define LCD_DISP_ON_CURSOR       0x0E   /* display on, cursor on                  */

#define LCD_DISP_ON_CURSOR_BLINK 0x0F   /* display on, cursor on, blink char      */

/* move cursor/shift display */
#define LCD_MOVE_CURSOR_LEFT     0x10   /* move cursor left  (decrement)          */

#define LCD_MOVE_CURSOR_RIGHT    0x14   /* move cursor right (increment)          */

#define LCD_MOVE_DISP_LEFT       0x18   /* shift display left                     */

#define LCD_MOVE_DISP_RIGHT      0x1C   /* shift display right                    */

/* function set: set interface data length and number of display lines */
#define LCD_FUNCTION_4BIT_1LINE  0x20   /* 4-bit interface, single line, 5x7 dots */

#define LCD_FUNCTION_4BIT_2LINES 0x28   /* 4-bit interface, dual line,   5x7 dots */

#define LCD_FUNCTION_8BIT_1LINE  0x30   /* 8-bit interface, single line, 5x7 dots */

#define LCD_FUNCTION_8BIT_2LINES 0x38   /* 8-bit interface, dual line,   5x7 dots */



 *  @name Functions



 @brief    Initialize display and select type of cursor

 @param    dispAttr \b LCD_DISP_OFF display off\n

                    \b LCD_DISP_ON display on, cursor off\n

                    \b LCD_DISP_ON_CURSOR display on, cursor on\n

                    \b LCD_DISP_ON_CURSOR_BLINK display on, cursor on flashing             

 @return  none

extern void lcd_init(uint8_t dispAttr);


 @brief    Clear display and set cursor to home position

 @param    void                                        

 @return   none

extern void lcd_clrscr(void);


 @brief    Set cursor to home position

 @param    void                                        

 @return   none

extern void lcd_home(void);


 @brief    Set cursor to specified position


 @param    x horizontal position\n (0: left most position)

 @param    y vertical position\n   (0: first line)

 @return   none

extern void lcd_gotoxy(uint8_t x, uint8_t y);


 @brief    Display character at current cursor position

 @param    c character to be displayed                                       

 @return   none

extern void lcd_putc(char c);


 @brief    Display string without auto linefeed

 @param    s string to be displayed                                        

 @return   none

extern void lcd_puts(const char *s);


 @brief    Display string from program memory without auto linefeed

 @param    s string from program memory be be displayed                                        

 @return   none

 @see      lcd_puts_P

extern void lcd_puts_p(const char *progmem_s);


 @brief    Send LCD controller instruction command

 @param    cmd instruction to send to LCD controller, see HD44780 data sheet

 @return   none

extern void lcd_command(uint8_t cmd);


 @brief    Send data byte to LCD controller 


 Similar to lcd_putc(), but without interpreting LF

 @param    data byte to send to LCD controller, see HD44780 data sheet

 @return   none

extern void lcd_data(uint8_t data);


 @brief macros for automatically storing string constant in program memory

#define lcd_puts_P(__s)         lcd_puts_p(PSTR(__s))

#endif //LCD_H