113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/* $NetBSD: hd44780reg.h,v 1.4 2009/08/30 02:07:05 tsutsui Exp $ */
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/*
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* Copyright (c) 2002 Dennis I. Chernoivanov
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _DEV_IC_HD44780REG_H_
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#define _DEV_IC_HD44780REG_H_
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/*
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* Register definitions for Hitachi HD44870 style displays
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*/
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#define HD_MAX_CHARS 80
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#define HD_ROW1_ADDR 0x00
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#define HD_ROW2_ADDR 0x40
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#define HD_TIMEOUT_LONG 5000
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#define HD_TIMEOUT_SHORT 100
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#define HD_TIMEOUT_NORMAL 200
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#define BUSY_FLAG 0x80
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/* Bit set helper */
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#define bset(cond, bit) ((cond) ? (bit) : 0x00)
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/* Get 4 most/least significant bits */
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#define hi_bits(byte) (((byte) & 0xf0) >> 4)
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#define lo_bits(byte) ((byte) & 0x0f)
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/*
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* 'Initialize by instruction' 8bit=1/0 8-bit/4-bit operation
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*/
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#define cmd_init(mode) ((uint8_t)(mode ? 0x3f : 0x03))
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/*
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* 'Clear display'
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*/
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#define cmd_clear() ((uint8_t)0x01)
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/*
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* 'Return home'
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*/
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#define cmd_rethome() ((uint8_t)0x03)
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/*
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* 'Entry mode set' id=1/0 increment/decrement
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* s=1 display shift
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*/
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#define cmd_modset(id, s) \
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((uint8_t)(0x04 | bset(id, 0x2) | bset(s, 0x1)))
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/*
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* 'Display on/off control' d=1/0 display on/off
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* c=1/0 cursor on/off
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* b=1/0 blinking of cursor position on/off
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*/
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#define cmd_dispctl(d, c, b) \
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((uint8_t)(0x08 | bset(d, 0x04) | bset(c, 0x02) | bset(b, 0x01)))
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/*
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* 'Cursor or display shift' sc=1/0 display shift/cursor move
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* rl=1/0 shift to the right/left
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*/
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#define cmd_shift(sc, rl) \
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((uint8_t)(0x13 | bset(sc, 0x08) | bset(rl, 0x04)))
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/*
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* 'Function set' dl=1/0 8 bits/4 bits operation
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* n=1/0 2 lines/1 line
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* f=1/0 5x10/5x8 dots font
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*/
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#define cmd_funcset(dl, n, f) \
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((uint8_t)(0x23 | bset(dl, 0x10) | bset(n, 0x08) | bset(f, 0x04)))
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/*
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* 'Set CGRAM address'
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*/
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#define cmd_cgramset(acg) \
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((uint8_t)(0x40 | ((acg) & 0x3f)))
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/*
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* 'Set DDRAM address'
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*/
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#define cmd_ddramset(add) \
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((uint8_t)(0x80 | ((add) & 0x7f)))
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#endif /* _DEV_IC_HD44780REG_H_ */
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