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Nice little test tool for linear led mapping

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Owen 2020-09-09 04:30:38 +02:00
parent ef740ff88c
commit 8ef24aa43c
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linearled/README.md
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## Simple C program used to debut the log function I used for LED control
## A Simple C program used to debug and examine the log function I used for LED control
The bit width (precision) for the PWM can be specified (max. 16 bit)
The Input values are integer percentages from 0-100.
The Output is a logarithmically scaling integer between 0 and the max PWM value.
``` C
/* Dump linear led values */
#include "stdio.h"
#include <stdlib.h>
#include <math.h>
//int pwmBits = 9; // Number of PWM bits
int main(int argc, char **argv) {
if (argc != 2) {
printf("\nERROR: This utility expects a single parameter; the bit-width of the PWM stream\n\n");
return 1; }
int pwmBits = atoi(argv[1]);
if (pwmBits < 2 || pwmBits > 16) {
printf("\nERROR: '%s' is not an integer in the range 2-16.\n\n", argv[1]);
return 1; }
int pwmMax = pow(2,pwmBits)-1;
printf("\nThe PWM Bit width (resolution) specified is %i, pwm range is from 0 to %i\n-----------\n", pwmBits, pwmMax);
for (int val = 0; val <= 100; val++) {
int pwm = round((pow(2,(1+(val*0.02)))-2)/6*pwmMax);
printf(" %3i : %5i\n", val, pwm);
}
printf("\n");
return 0;
}
```
Adjust the width as necesscary and compile with:
$ gcc linearled.c -o linearled -lm
And run to see the results:
```bash
$ ./linearled 9
The PWM Bit width (resolution) specified is 9, pwm range is from 0 to 511
-----------
0 : 0
1 : 2
2 : 5
3 : 7
4 : 10
5 : 12
6 : 15
7 : 17
8 : 20
9 : 23
10 : 25
11 : 28
12 : 31
13 : 34
14 : 36
15 : 39
16 : 42
17 : 45
18 : 48
19 : 51
20 : 54
21 : 58
22 : 61
23 : 64
24 : 67
25 : 71
26 : 74
27 : 77
28 : 81
29 : 84
30 : 88
31 : 91
32 : 95
33 : 99
34 : 103
35 : 106
36 : 110
37 : 114
38 : 118
39 : 122
40 : 126
41 : 130
42 : 135
43 : 139
44 : 143
45 : 148
46 : 152
47 : 156
48 : 161
49 : 166
50 : 170
51 : 175
52 : 180
53 : 185
54 : 190
55 : 195
56 : 200
57 : 205
58 : 210
59 : 216
60 : 221
61 : 226
62 : 232
63 : 238
64 : 243
65 : 249
66 : 255
67 : 261
68 : 267
69 : 273
70 : 279
71 : 285
72 : 292
73 : 298
74 : 305
75 : 311
76 : 318
77 : 325
78 : 332
79 : 339
80 : 346
81 : 353
82 : 361
83 : 368
84 : 375
85 : 383
86 : 391
87 : 399
88 : 407
89 : 415
90 : 423
91 : 431
92 : 439
93 : 448
94 : 457
95 : 465
96 : 474
97 : 483
98 : 492
99 : 502
100 : 511
```
The code can be adapted into your custom LED setting function
Designed to be run on the commandline (unix), Compile with:
gcc linearled.c -o linearled -lm

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linearled/linearled.c
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/* Dump linear led values */
#include "stdio.h"
#include <stdlib.h>
#include <math.h>
int pwmBits = 9; // Number of PWM bits
//int pwmBits = 9; // Number of PWM bits
int main(int argc, char **argv) {
if (argc != 2) {
printf("\nERROR: This utility expects a single parameter; the bit-width of the PWM stream\n\n");
return 1; }
int pwmBits = atoi(argv[1]);
if (pwmBits < 2 || pwmBits > 16) {
printf("\nERROR: '%s' is not an integer in the range 2-16.\n\n", argv[1]);
return 1; }
void main() {
int pwmMax = pow(2,pwmBits)-1;
printf("\nThe PWM Bit width (resolution) specified is %i, pwm range is from 0 to %i\n-----------\n", pwmBits, pwmMax);
for (int val = 0; val <= 100; val++) {
int pwm = round((pow(2,(1+(val*0.02)))-2)/6*pwmMax);
printf("%i : %i\n", val, pwm);
printf(" %3i : %5i\n", val, pwm);
}
printf("\n");
return 0;
}