1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* Copyright Daniel Jones <daniel@danieljon.es>
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <unistd.h>
/*
A
_
F| |B
G -
E| |C
-
D
A 7 segment display (unsurprisingly) has 7 individual segments that can conveniently make 0-9 and A-F
perfect for hexadecimal.
The state of a single 7 segment character can also conveniently be stored in 8 bits (a byte, in C a char),
almost as if these aren't coincidences (they're not).
*/
enum segments
{
/* refer to the diagram to know which value represents which segment */
SEG_A = 1 << 0,
SEG_B = 1 << 1,
SEG_C = 1 << 2,
SEG_D = 1 << 3,
SEG_E = 1 << 4,
SEG_F = 1 << 5,
SEG_G = 1 << 6,
};
enum characters
{
CHAR_ZERO = SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F,
CHAR_ONE = SEG_B | SEG_C,
CHAR_TWO = SEG_A | SEG_B | SEG_D | SEG_E | SEG_G,
CHAR_THREE = SEG_A | SEG_B | SEG_C | SEG_D | SEG_G,
CHAR_FOUR = SEG_B | SEG_C | SEG_F | SEG_G,
CHAR_FIVE = SEG_A | SEG_C | SEG_D | SEG_F | SEG_G,
CHAR_SIX = SEG_A | SEG_C | SEG_D | SEG_E | SEG_F | SEG_G,
CHAR_SEVEN = SEG_A | SEG_B | SEG_C,
CHAR_EIGHT = SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F | SEG_G,
CHAR_NINE = SEG_A | SEG_B | SEG_C | SEG_D | SEG_F | SEG_G,
CHAR_A = SEG_A | SEG_B | SEG_C | SEG_E | SEG_F | SEG_G,
CHAR_B = SEG_C | SEG_D | SEG_E | SEG_F | SEG_G,
CHAR_C = SEG_A | SEG_D | SEG_E | SEG_F,
CHAR_D = SEG_B | SEG_C | SEG_D | SEG_E | SEG_G,
CHAR_E = SEG_A | SEG_D | SEG_E | SEG_F | SEG_G,
CHAR_F = SEG_A | SEG_E | SEG_F | SEG_G,
};
void
printdisplay(char segs)
{
/* line 1 */
printf("\t %c\n", (segs & SEG_A) ? '_' : ' ');
/* line 2 */
printf("\t%c %c\n", (segs & SEG_F) ? '|' : ' ',
(segs & SEG_B) ? '|' : ' ');
/* line 3 */
printf("\t %c\n", (segs & SEG_G) ? '-' : ' ');
/* line 4 */
printf("\t%c %c\n", (segs & SEG_E) ? '|' : ' ',
(segs & SEG_C) ? '|' : ' ');
/* line 5 */
printf("\t %c\n", (segs & SEG_D) ? '-' : ' ');
}
void
clear()
{
printf("%s", "\033[5;0F");
printf("%s", "\033[0J");
}
char hexcharacters[16] = {CHAR_ZERO, CHAR_ONE, CHAR_TWO, CHAR_THREE, CHAR_FOUR, CHAR_FIVE, CHAR_SIX, CHAR_SEVEN, CHAR_EIGHT, CHAR_NINE,
CHAR_A, CHAR_B, CHAR_C, CHAR_D, CHAR_E, CHAR_F};
int
main(void)
{
for (int i = 0; i < 16; i++)
{
printdisplay(hexcharacters[i]);
sleep(1);
clear();
}
}
|
