FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/hd44780reg.h

     /* $NetBSD: hd44780reg.h,v 1.2 2005/01/08 20:19:08 joff Exp $ */
     
     /*
      * Copyright (c) 2002 Dennis I. Chernoivanov
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #ifndef _DEV_IC_HD44780REG_H_
    #define _DEV_IC_HD44780REG_H_
    
    /*
     * Register definitions for Hitachi HD44870 style displays
     */
    
    #define HD_MAX_CHARS    80
    
    #define HD_ROW1_ADDR    0x00
    #define HD_ROW2_ADDR    0x40
    
    #define HD_TIMEOUT_LONG 5000
    #define HD_TIMEOUT_SHORT        100
    #define HD_TIMEOUT_NORMAL       200
    
    #define BUSY_FLAG       0x80
    
    /* Bit set helper */
    #define bset(cond, bit) ((cond) ? (bit) : 0x00)
    
    /* Get 4 most/least significant bits */
    #define hi_bits(byte)   (((byte) & 0xf0) >> 4)
    #define lo_bits(byte)   ((byte) & 0x0f)
    
    /*
     * 'Initialize by instruction'  8bit=1/0 8-bit/4-bit operation
     */
    #define cmd_init(mode)  ((u_int8_t)(mode ? 0x3f : 0x03))
    
    /*
     * 'Clear display'
     */
    #define cmd_clear()     ((u_int8_t)0x01)
    
    /*
     * 'Return home'
     */
    #define cmd_rethome()   ((u_int8_t)0x03)
    
    /*
     * 'Entry mode set'             id=1/0 increment/decrement
     *                              s=1  display shift
     */
    #define cmd_modset(id, s) \
            ((u_int8_t)(0x04 | bset(id, 0x2) | bset(s, 0x1)))
    
    /*
     * 'Display on/off control'     d=1/0 display on/off
     *                              c=1/0 cursor on/off
     *                              b=1/0 blinking of cursor position on/off
     */
    #define cmd_dispctl(d, c, b) \
            ((u_int8_t)(0x08 | bset(d, 0x04) | bset(c, 0x02) | bset(b, 0x01)))
    
    /*
     * 'Cursor or display shift'    sc=1/0 display shift/cursor move
     *                              rl=1/0 shift to the right/left
     */
    #define cmd_shift(sc, rl) \
            ((u_int8_t)(0x13 | bset(sc, 0x08) | bset(rl, 0x04)))
    
    /*
     * 'Function set'               dl=1/0 8 bits/4 bits operation
     *                              n=1/0  2 lines/1 line
     *                              f=1/0  5x10/5x8 dots font
     */
    #define cmd_funcset(dl, n, f) \
             ((u_int8_t)(0x23 | bset(dl, 0x10) | bset(n, 0x08) | bset(f, 0x04)))
    
   /*
    * 'Set CGRAM address'
    */
   #define cmd_cgramset(acg) \
           ((u_int8_t)(0x40 | ((acg) & 0x3f)))
   
   /*
    * 'Set DDRAM address'
    */
   #define cmd_ddramset(add) \
           ((u_int8_t)(0x80 | ((add) & 0x7f)))
   
   #endif /* _DEV_IC_HD44780REG_H_ */

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