1 /*
2 * Author: Brendan Le Foll
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 static volatile int counter = 0;
30 static volatile int oldcounter = 0;
31
32 void
interrupt(void * args)33 interrupt(void* args)
34 {
35 ++counter;
36 }
37
38 int
main()39 main()
40 {
41 mraa_init();
42 mraa_gpio_context x;
43
44 x = mraa_gpio_init(6);
45 if (x == NULL) {
46 return 1;
47 }
48
49 mraa_gpio_dir(x, MRAA_GPIO_IN);
50
51 mraa_gpio_edge_t edge = MRAA_GPIO_EDGE_BOTH;
52
53 mraa_gpio_isr(x, edge, &interrupt, NULL);
54
55 for (;;) {
56 if (counter != oldcounter) {
57 fprintf(stdout, "timeout counter == %d\n", counter);
58 oldcounter = counter;
59 }
60 // got to relieve our poor CPU!
61 sleep(1);
62 }
63
64 mraa_gpio_close(x);
65
66 return MRAA_SUCCESS;
67 }
68