1 /*
2 * Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
3 * Copyright (c) 2014 Intel Corporation.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 #include <unistd.h>
26 #include <signal.h>
27
28 #include "mraa.hpp"
29
30 int running = 0;
31
32 void
sig_handler(int signo)33 sig_handler(int signo)
34 {
35 if (signo == SIGINT) {
36 printf("closing PWM nicely\n");
37 running = -1;
38 }
39 }
40
41 int
main()42 main()
43 {
44 signal(SIGINT, sig_handler);
45 //! [Interesting]
46 mraa::Pwm* pwm;
47
48 pwm = new mraa::Pwm(3);
49 if (pwm == NULL) {
50 return MRAA_ERROR_UNSPECIFIED;
51 }
52 fprintf(stdout, "Cycling PWM on IO3 (pwm3) \n");
53 pwm->enable(true);
54
55 float value = 0.0f;
56 while (running == 0) {
57 value = value + 0.01f;
58 pwm->write(value);
59 usleep(50000);
60 if (value >= 1.0f) {
61 value = 0.0f;
62 }
63 }
64 delete pwm;
65 //! [Interesting]
66
67 return MRAA_SUCCESS;
68 }
69