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
27 #include "mraa.h"
28
29 int
main()30 main()
31 {
32 mraa_init();
33 //! [Interesting]
34 mraa_pwm_context pwm;
35 pwm = mraa_pwm_init(3);
36 if (pwm == NULL) {
37 return 1;
38 }
39 mraa_pwm_period_us(pwm, 200);
40 mraa_pwm_enable(pwm, 1);
41
42 float value = 0.0f;
43
44 while (1) {
45 value = value + 0.01f;
46 mraa_pwm_write(pwm, value);
47 usleep(50000);
48 if (value >= 1.0f) {
49 value = 0.0f;
50 }
51 float output = mraa_pwm_read(pwm);
52 }
53 //! [Interesting]
54 return 0;
55 }
56