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HD44780.h
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/* ************************************************************************
*
* HD44780 compatible character display
*
* (c) 2012-2017 by Markus Reschke
* based on code from Markus Frejek and Karl-Heinz Kübbeler
*
* ************************************************************************ */
/* ************************************************************************
* addresses
* ************************************************************************ */
/*
* CGROM
* - 1240 bytes
* - 208 characters 5x8 and 32 characters 5x10
*/
/*
* CGRAM
* - 64 bytes
* - used-defined characters
* - 8 characters 5x8 or 4 characters 5x10
*/
/*
* DDRAM
* - 80 bytes
*/
/* start adddresses of lines */
#define ADDR_LINE_1 0x00 /* line #1 */
#define ADDR_LINE_2 0x40 /* line #2 */
#define ADDR_LINE_3 0x14 /* line #3 */
#define ADDR_LINE_4 0x54 /* line #4 */
/* ************************************************************************
* LCD commands
* ************************************************************************ */
/*
* clear display
*/
#define CMD_CLEAR_DISPLAY 0x01 /* clear display */
/*
* return home
* - exec time: 1.52ms
*/
#define CMD_RETURN_HOME 0x02 /* return home */
/*
* entry mode set
* - exec time: 37µs
*/
#define CMD_ENTRY_MODE_SET 0x04 /* entry mode set */
#define FLAG_CURSOR_DECREASE 0b00000000 /* auto-decrease cursor position */
#define FLAG_CURSOR_INCREASE 0b00000010 /* auto-increase cursor position */
#define FLAG_DISPLAY_NOSHIFT 0b00000000 /* enable display auto-shift */
#define FLAG_DISPLAY_SHIFT 0b00000001 /* disable display auto-shift */
/*
* display control
*/
#define CMD_DISPLAY_CONTROL 0x08 /* display control */
#define FLAG_DISPLAY_OFF 0b00000000 /* display off */
#define FLAG_DISPLAY_ON 0b00000100 /* display on */
#define FLAG_CURSOR_OFF 0b00000000 /* cursor off */
#define FLAG_CURSOR_ON 0b00000010 /* cursor on */
#define FLAG_BLINK_OFF 0b00000000 /* blinking off */
#define FLAG_BLINK_ON 0b00000001 /* blinking on */
/*
* shift
*/
#define CMD_SHIFT 0x10 /* shift */
#define FLAG_SHIFT_CURSOR 0b00000000 /* shift cursor */
#define FLAG_SHIFT_DISPLAY 0b00001000 /* shift display */
#define FLAG_SHIFT_LEFT 0b00000000 /* shift left */
#define FLAG_SHIFT_RIGHT 0b00000100 /* shift right */
/*
* function set
*/
#define CMD_FUNCTION_SET 0x20 /* function set */
#define FLAG_INTERFACE_4BIT 0b00000000 /* enable 4 bit data interface */
#define FLAG_INTERFACE_8BIT 0b00010000 /* enable 8 bit data interface */
#define FLAG_LINES_1 0b00000000 /* display one line */
#define FLAG_LINES_2 0b00001000 /* display two lines */
#define FLAG_FONT_5X7 0b00000000 /* select 5x7 font */
#define FLAG_FONT_5X10 0b00000100 /* select 5x10 font */
/*
* set CG RAM address
*/
#define CMD_SET_CG_RAM_ADDR 0x40 /* set CG RAM address (custom character) */
/*
* set DD RAM address
*/
#define CMD_SET_DD_RAM_ADDR 0x80 /* set DD RAM address (cursor position) */
/* ************************************************************************
* EOF
* ************************************************************************ */