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      1 /*
      2  * Author: Jon Trulson <jtrulson (at) 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 
     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
     44 void hallISR(void *arg)
     45 {
     46   counter++;
     47 }
     48 
     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