lcd.inc

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#ifndef LCD_HEADER
#  define LCD_HEADER
//
// Hitachi LCD Control routines for industry standard LCD controllers.
// 
// The following equates need to be changed to match your hardware.  This
// code assumes an 4 bit interface.  The data port is the low nibble of the 
// selected output port.  The control bits can be any three bits of any port.
// 
// The following equates need to be changed to match your hardware.
//
#define LCD_DATA_OUT    PORTB
#define LCD_DATA_DDR    DDRB
#define LCD_DATA_IN     PINB
//
// Set this to either low nibble (0x0F) or high nibble (0xF0) of the
// port you are using.
//
#define LCD_LOW_NIBBLE 0x0F
#define LCD_HI_NIBBLE  0xF0
#define LCD_DATA_BITS LCD_LOW_NIBBLE

#define LCD_CTL         PORTB
#define LCD_CTL_DDR     DDRB
#define         LCD_RS  PB7
#define         LCD_RW  PB6
#define         LCD_E   PB5
//
// Initialize ports...
//
#define LCD_CTL_DDR_INIT 1<<LCD_RS | 1<<LCD_RW | 1<<LCD_E
//
//
// Instructions/bits.  NB Busy Flag (BF) is a bit, not a mask.
//
#define LCD_CLEAR      (1<<0)
#define LCD_HOME       (1<<1)
#define LCD_ENTRY      (1<<2)
#define         LCD_ID (1<<1)   // Decrement/Increment Cursor 
#define         LCD_S  (1<<0)   // Display No Shift/Shift
#define LCD_DISPLAY    (1<<3)
#define         LCD_D  (1<<2)   // Display off/on
#define         LCD_C  (1<<1)   // Cursor off/On
#define         LCD_B  (1<<0)   // Cursor No Blink/Blink
#define LCD_SHIFT      (1<<4)
#define         LCD_CL (1<<3)   // Shift Cursor/Display
#define         LCD_RL (1<<2)   // Shift Left/Right
#define LCD_FUNC       (1<<5)
#define         LCD_DL (1<<4)   // 4/8 bit interface
#define         LCD_N  (1<<3)   // 1/2 line display
#define         LCD_F  (1<<2)   // 5x7/5/10 dot charactor
#define LCD_SET_CGRAM  (1<<6)
#define LCD_SET_DDRAM  (1<<7)
//
// Reading an instruction gives you the current address counter and 
// the busy flag.
//
#if (LCD_DATA_BITS==0x0F)
#   define LCD_BF      3        // Busy flag (MSB)
#else
#   define LCD_BF      7
#endif
//
//your LCD display type here
//
// Set LCD to 4 bit i/f, two lines
//
#define LCD_FUNCTION_SET LCD_FUNC | LCD_N
//
// Turn display on, with cursor and make cursor blinking
//
#define LCD_DISPLAY_SET (LCD_DISPLAY | LCD_D | LCD_C | LCD_B)
//
// Misc commands that are useful
//
#define LCD_Next_Line (LCD_SET_DDRAM | 0x40)  // Start of second line

#define LCD_LINE1     0x00          // Addresses for 4x20 display
#define LCD_LINE2     0x40
#define LCD_LINE3     0x14
#define LCD_LINE4     0x54

#endif  // LCDIO_HEADER