1 /* $NetBSD: hd44780reg.h,v 1.4 2009/08/30 02:07:05 tsutsui Exp $ */ 2 3 /* 4 * Copyright (c) 2002 Dennis I. Chernoivanov 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #ifndef _DEV_IC_HD44780REG_H_ 31 #define _DEV_IC_HD44780REG_H_ 32 33 /* 34 * Register definitions for Hitachi HD44870 style displays 35 */ 36 37 #define HD_MAX_CHARS 80 38 39 #define HD_ROW1_ADDR 0x00 40 #define HD_ROW2_ADDR 0x40 41 42 #define HD_TIMEOUT_LONG 5000 43 #define HD_TIMEOUT_SHORT 100 44 #define HD_TIMEOUT_NORMAL 200 45 46 #define BUSY_FLAG 0x80 47 48 /* Bit set helper */ 49 #define bset(cond, bit) ((cond) ? (bit) : 0x00) 50 51 /* Get 4 most/least significant bits */ 52 #define hi_bits(byte) (((byte) & 0xf0) >> 4) 53 #define lo_bits(byte) ((byte) & 0x0f) 54 55 /* 56 * 'Initialize by instruction' 8bit=1/0 8-bit/4-bit operation 57 */ 58 #define cmd_init(mode) ((uint8_t)(mode ? 0x3f : 0x03)) 59 60 /* 61 * 'Clear display' 62 */ 63 #define cmd_clear() ((uint8_t)0x01) 64 65 /* 66 * 'Return home' 67 */ 68 #define cmd_rethome() ((uint8_t)0x03) 69 70 /* 71 * 'Entry mode set' id=1/0 increment/decrement 72 * s=1 display shift 73 */ 74 #define cmd_modset(id, s) \ 75 ((uint8_t)(0x04 | bset(id, 0x2) | bset(s, 0x1))) 76 77 /* 78 * 'Display on/off control' d=1/0 display on/off 79 * c=1/0 cursor on/off 80 * b=1/0 blinking of cursor position on/off 81 */ 82 #define cmd_dispctl(d, c, b) \ 83 ((uint8_t)(0x08 | bset(d, 0x04) | bset(c, 0x02) | bset(b, 0x01))) 84 85 /* 86 * 'Cursor or display shift' sc=1/0 display shift/cursor move 87 * rl=1/0 shift to the right/left 88 */ 89 #define cmd_shift(sc, rl) \ 90 ((uint8_t)(0x13 | bset(sc, 0x08) | bset(rl, 0x04))) 91 92 /* 93 * 'Function set' dl=1/0 8 bits/4 bits operation 94 * n=1/0 2 lines/1 line 95 * f=1/0 5x10/5x8 dots font 96 */ 97 #define cmd_funcset(dl, n, f) \ 98 ((uint8_t)(0x23 | bset(dl, 0x10) | bset(n, 0x08) | bset(f, 0x04))) 99 100 /* 101 * 'Set CGRAM address' 102 */ 103 #define cmd_cgramset(acg) \ 104 ((uint8_t)(0x40 | ((acg) & 0x3f))) 105 106 /* 107 * 'Set DDRAM address' 108 */ 109 #define cmd_ddramset(add) \ 110 ((uint8_t)(0x80 | ((add) & 0x7f))) 111 112 #endif /* _DEV_IC_HD44780REG_H_ */ 113