1 /*
2 * Author: Jon Trulson <jtrulson@ics.com>
3 * Copyright (c) 2015 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 <iostream>
27 #include <signal.h>
28 #include "a110x.h"
29
30 using namespace std;
31
32 int shouldRun = true;
33
sig_handler(int signo)34 void sig_handler(int signo)
35 {
36 if (signo == SIGINT)
37 shouldRun = false;
38 }
39
40 // Our pulse counter
41 volatile unsigned int counter = 0;
42
43 // Our interrupt handler
hallISR(void * arg)44 void hallISR(void *arg)
45 {
46 counter++;
47 }
48
main()49 int main ()
50 {
51 signal(SIGINT, sig_handler);
52
53 //! [Interesting]
54 // Instantiate an A110X sensor on digital pin D2
55 upm::A110X* hall = new upm::A110X(2);
56
57 // This example uses a user-supplied interrupt handler to count
58 // pulses that occur when a magnetic field of the correct polarity
59 // is detected. This could be used to measure the rotations per
60 // minute (RPM) of a rotor for example.
61
62 hall->installISR(hallISR, NULL);
63
64 while (shouldRun)
65 {
66 cout << "Pulses detected: " << counter << endl;
67
68 sleep(1);
69 }
70 //! [Interesting]
71
72 cout << "Exiting..." << endl;
73
74 delete hall;
75 return 0;
76 }
77