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map_to_7segment.h
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map_to_7segment.h
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/*
* Copyright (c) 2005 Henk Vergonet <Henk.Vergonet@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef MAP_TO_7SEGMENT_H
#define MAP_TO_7SEGMENT_H
/* This file provides translation primitives and tables for the conversion
* of (ASCII) characters to a 7-segments notation.
*
* The 7 segment's wikipedia notation below is used as standard.
* See: http://en.wikipedia.org/wiki/Seven_segment_display
*
* Notation: +-a-+
* f b
* +-g-+
* e c
* +-d-+
*
* Usage:
*
* Register a map variable, and fill it with a character set:
* static SEG7_DEFAULT_MAP(map_seg7);
*
*
* Then use for conversion:
* seg7 = map_to_seg7(&map_seg7, some_char);
* ...
*
* In device drivers it is recommended, if required, to make the char map
* accessible via the sysfs interface using the following scheme:
*
* static ssize_t show_map(struct device *dev, char *buf) {
* memcpy(buf, &map_seg7, sizeof(map_seg7));
* return sizeof(map_seg7);
* }
* static ssize_t store_map(struct device *dev, const char *buf, size_t cnt) {
* if(cnt != sizeof(map_seg7))
* return -EINVAL;
* memcpy(&map_seg7, buf, cnt);
* return cnt;
* }
* static DEVICE_ATTR(map_seg7, PERMS_RW, show_map, store_map);
*
* History:
* 2005-05-31 RFC linux-kernel@vger.kernel.org
*/
#include <linux/errno.h>
#define BIT_SEG7_A 0
#define BIT_SEG7_B 1
#define BIT_SEG7_C 2
#define BIT_SEG7_D 3
#define BIT_SEG7_E 4
#define BIT_SEG7_F 5
#define BIT_SEG7_G 6
#define BIT_SEG7_RESERVED 7
struct seg7_conversion_map {
unsigned char table[128];
};
static __inline__ int map_to_seg7(struct seg7_conversion_map *map, int c)
{
return c >= 0 && c < sizeof(map->table) ? map->table[c] : -EINVAL;
}
#define SEG7_CONVERSION_MAP(_name, _map) \
struct seg7_conversion_map _name = { .table = { _map } }
/*
* It is recommended to use a facility that allows user space to redefine
* custom character sets for LCD devices. Please use a sysfs interface
* as described above.
*/
#define MAP_TO_SEG7_SYSFS_FILE "map_seg7"
/*******************************************************************************
* ASCII conversion table
******************************************************************************/
#define _SEG7(l,a,b,c,d,e,f,g) \
( a<<BIT_SEG7_A | b<<BIT_SEG7_B | c<<BIT_SEG7_C | d<<BIT_SEG7_D | \
e<<BIT_SEG7_E | f<<BIT_SEG7_F | g<<BIT_SEG7_G )
#define _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
#define _MAP_33_47_ASCII_SEG7_SYMBOL \
_SEG7('!',0,0,0,0,1,1,0), _SEG7('"',0,1,0,0,0,1,0), _SEG7('#',0,1,1,0,1,1,0),\
_SEG7('$',1,0,1,1,0,1,1), _SEG7('%',0,0,1,0,0,1,0), _SEG7('&',1,0,1,1,1,1,1),\
_SEG7('\'',0,0,0,0,0,1,0),_SEG7('(',1,0,0,1,1,1,0), _SEG7(')',1,1,1,1,0,0,0),\
_SEG7('*',0,1,1,0,1,1,1), _SEG7('+',0,1,1,0,0,0,1), _SEG7(',',0,0,0,0,1,0,0),\
_SEG7('-',0,0,0,0,0,0,1), _SEG7('.',0,0,0,0,1,0,0), _SEG7('/',0,1,0,0,1,0,1),
#define _MAP_48_57_ASCII_SEG7_NUMERIC \
_SEG7('0',1,1,1,1,1,1,0), _SEG7('1',0,1,1,0,0,0,0), _SEG7('2',1,1,0,1,1,0,1),\
_SEG7('3',1,1,1,1,0,0,1), _SEG7('4',0,1,1,0,0,1,1), _SEG7('5',1,0,1,1,0,1,1),\
_SEG7('6',1,0,1,1,1,1,1), _SEG7('7',1,1,1,0,0,0,0), _SEG7('8',1,1,1,1,1,1,1),\
_SEG7('9',1,1,1,1,0,1,1),
#define _MAP_58_64_ASCII_SEG7_SYMBOL \
_SEG7(':',0,0,0,1,0,0,1), _SEG7(';',0,0,0,1,0,0,1), _SEG7('<',1,0,0,0,0,1,1),\
_SEG7('=',0,0,0,1,0,0,1), _SEG7('>',1,1,0,0,0,0,1), _SEG7('?',1,1,1,0,0,1,0),\
_SEG7('@',1,1,0,1,1,1,1),
#define _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \
_SEG7('A',1,1,1,0,1,1,1), _SEG7('B',1,1,1,1,1,1,1), _SEG7('C',1,0,0,1,1,1,0),\
_SEG7('D',1,1,1,1,1,1,0), _SEG7('E',1,0,0,1,1,1,1), _SEG7('F',1,0,0,0,1,1,1),\
_SEG7('G',1,1,1,1,0,1,1), _SEG7('H',0,1,1,0,1,1,1), _SEG7('I',0,1,1,0,0,0,0),\
_SEG7('J',0,1,1,1,0,0,0), _SEG7('K',0,1,1,0,1,1,1), _SEG7('L',0,0,0,1,1,1,0),\
_SEG7('M',1,1,1,0,1,1,0), _SEG7('N',1,1,1,0,1,1,0), _SEG7('O',1,1,1,1,1,1,0),\
_SEG7('P',1,1,0,0,1,1,1), _SEG7('Q',1,1,1,1,1,1,0), _SEG7('R',1,1,1,0,1,1,1),\
_SEG7('S',1,0,1,1,0,1,1), _SEG7('T',0,0,0,1,1,1,1), _SEG7('U',0,1,1,1,1,1,0),\
_SEG7('V',0,1,1,1,1,1,0), _SEG7('W',0,1,1,1,1,1,1), _SEG7('X',0,1,1,0,1,1,1),\
_SEG7('Y',0,1,1,0,0,1,1), _SEG7('Z',1,1,0,1,1,0,1),
#define _MAP_91_96_ASCII_SEG7_SYMBOL \
_SEG7('[',1,0,0,1,1,1,0), _SEG7('\\',0,0,1,0,0,1,1),_SEG7(']',1,1,1,1,0,0,0),\
_SEG7('^',1,1,0,0,0,1,0), _SEG7('_',0,0,0,1,0,0,0), _SEG7('`',0,1,0,0,0,0,0),
#define _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
_SEG7('A',1,1,1,0,1,1,1), _SEG7('b',0,0,1,1,1,1,1), _SEG7('c',0,0,0,1,1,0,1),\
_SEG7('d',0,1,1,1,1,0,1), _SEG7('E',1,0,0,1,1,1,1), _SEG7('F',1,0,0,0,1,1,1),\
_SEG7('G',1,1,1,1,0,1,1), _SEG7('h',0,0,1,0,1,1,1), _SEG7('i',0,0,1,0,0,0,0),\
_SEG7('j',0,0,1,1,0,0,0), _SEG7('k',0,0,1,0,1,1,1), _SEG7('L',0,0,0,1,1,1,0),\
_SEG7('M',1,1,1,0,1,1,0), _SEG7('n',0,0,1,0,1,0,1), _SEG7('o',0,0,1,1,1,0,1),\
_SEG7('P',1,1,0,0,1,1,1), _SEG7('q',1,1,1,0,0,1,1), _SEG7('r',0,0,0,0,1,0,1),\
_SEG7('S',1,0,1,1,0,1,1), _SEG7('T',0,0,0,1,1,1,1), _SEG7('u',0,0,1,1,1,0,0),\
_SEG7('v',0,0,1,1,1,0,0), _SEG7('W',0,1,1,1,1,1,1), _SEG7('X',0,1,1,0,1,1,1),\
_SEG7('y',0,1,1,1,0,1,1), _SEG7('Z',1,1,0,1,1,0,1),
#define _MAP_123_126_ASCII_SEG7_SYMBOL \
_SEG7('{',1,0,0,1,1,1,0), _SEG7('|',0,0,0,0,1,1,0), _SEG7('}',1,1,1,1,0,0,0),\
_SEG7('~',1,0,0,0,0,0,0),
/* Maps */
/* This set tries to map as close as possible to the visible characteristics
* of the ASCII symbol, lowercase and uppercase letters may differ in
* presentation on the display.
*/
#define MAP_ASCII7SEG_ALPHANUM \
_MAP_0_32_ASCII_SEG7_NON_PRINTABLE \
_MAP_33_47_ASCII_SEG7_SYMBOL \
_MAP_48_57_ASCII_SEG7_NUMERIC \
_MAP_58_64_ASCII_SEG7_SYMBOL \
_MAP_65_90_ASCII_SEG7_ALPHA_UPPR \
_MAP_91_96_ASCII_SEG7_SYMBOL \
_MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
_MAP_123_126_ASCII_SEG7_SYMBOL
/* This set tries to map as close as possible to the symbolic characteristics
* of the ASCII character for maximum discrimination.
* For now this means all alpha chars are in lower case representations.
* (This for example facilitates the use of hex numbers with uppercase input.)
*/
#define MAP_ASCII7SEG_ALPHANUM_LC \
_MAP_0_32_ASCII_SEG7_NON_PRINTABLE \
_MAP_33_47_ASCII_SEG7_SYMBOL \
_MAP_48_57_ASCII_SEG7_NUMERIC \
_MAP_58_64_ASCII_SEG7_SYMBOL \
_MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
_MAP_91_96_ASCII_SEG7_SYMBOL \
_MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
_MAP_123_126_ASCII_SEG7_SYMBOL
#define SEG7_DEFAULT_MAP(_name) \
SEG7_CONVERSION_MAP(_name,MAP_ASCII7SEG_ALPHANUM)
#endif /* MAP_TO_7SEGMENT_H */