Quelle map_to_7segment.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
* Copyright (c) 2005 Henk Vergonet <Henk.Vergonet@gmail.com>
*/

#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: https://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 map_seg7_show(struct device *dev,
* struct device_attribute *attr, char *buf)
* {
* memcpy(buf, &map_seg7, sizeof(map_seg7));
* return sizeof(map_seg7);
* }
* static ssize_t map_seg7_store(struct device *dev,
* struct device_attribute *attr, const char *buf,
* size_t cnt)
* {
* if(cnt != sizeof(map_seg7))
* return -EINVAL;
* memcpy(&map_seg7, buf, cnt);
* return cnt;
* }
* static DEVICE_ATTR_RW(map_seg7);
*
* 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 */

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