4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2003, 2004, 2005 Develer S.r.l. (http://www.develer.com/)
30 * Copyright 2001 Bernardo Innocenti <bernie@codewiz.org>
36 * \author Bernardo Innocenti <bernie@develer.com>
37 * \author Stefano Fedrigo <aleph@develer.com>
39 * \brief LCD low-level hardware macros
44 *#* Revision 1.1 2006/09/20 17:39:24 marco
45 *#* Low level lcd for avr.
52 #include <appconfig.h>
56 #include <cfg/macros.h> /* BV() */
57 #include <cfg/debug.h>
64 * \name LCD I/O pins/ports
67 #define LCD_RS BV(PG3)
68 #define LCD_RW BV(PG0)
70 #define LCD_DB0 BV(PA0)
71 #define LCD_DB1 BV(PA1)
72 #define LCD_DB2 BV(PA2)
73 #define LCD_DB3 BV(PA3)
74 #define LCD_DB4 BV(PA4)
75 #define LCD_DB5 BV(PA5)
76 #define LCD_DB6 BV(PA6)
77 #define LCD_DB7 BV(PA7)
81 * \name DB high nibble (DB[4-7])
84 #define LCD_PORT PORTG
85 #define LCD_DB_PORT PORTA
87 #define LCD_DB_PIN PINA
89 #define LCD_DB_DDR DDRA
92 #define LCD_MASK (LCD_DB7 | LCD_DB6 | LCD_DB5 | LCD_DB4)
95 #define LCD_MASK (uint8_t)0xff
101 * \name LCD bus control macros
104 #define LCD_CLR_RS (LCD_PORT &= ~LCD_RS)
105 #define LCD_SET_RS (LCD_PORT |= LCD_RS)
106 #define LCD_CLR_RD (LCD_PORT &= ~LCD_RW)
107 #define LCD_SET_RD (LCD_PORT |= LCD_RW)
108 #define LCD_CLR_E (LCD_PORT &= ~LCD_E)
109 #define LCD_SET_E (LCD_PORT |= LCD_E)
112 #define LCD_WRITE_H(x) (LCD_DB_PORT = (LCD_DB_PORT & ~LCD_MASK) | (((x) >> (4 - LCD_SHIFT)) & LCD_MASK))
113 #define LCD_WRITE_L(x) (LCD_DB_PORT = (LCD_DB_PORT & ~LCD_MASK) | (((x) << LCD_SHIFT) & LCD_MASK))
114 #define LCD_READ_H ((LCD_DB_PIN & LCD_MASK) >> (4 - LCD_SHIFT))
115 #define LCD_READ_L ((LCD_DB_PIN & LCD_MASK) >> LCD_SHIFT)
117 #define LCD_WRITE(x) (LCD_DB_PORT = (x))
118 #define LCD_READ (LCD_DB_PIN)
122 /** Set data bus direction to output (write to display) */
123 #define LCD_DB_OUT (LCD_DB_DDR |= LCD_MASK)
125 /** Set data bus direction to input (read from display) */
126 #define LCD_DB_IN (LCD_DB_DDR &= ~LCD_MASK)
128 /** Delay for write (Enable pulse width, 220ns) */
129 #define LCD_DELAY_WRITE \
138 /** Delay for read (Data ouput delay time, 120ns) */
139 #define LCD_DELAY_READ \
148 INLINE void lcd_bus_init(void)
151 IRQ_SAVE_DISABLE(flags);
153 LCD_PORT = (LCD_PORT & ~(LCD_E | LCD_RW)) | LCD_RS;
154 LCD_DDR |= LCD_RS | LCD_RW | LCD_E;
157 * Data bus is in output state most of the time:
158 * LCD r/w functions assume it is left in output state
166 #endif /* HW_LCD_H */