1 /*
2 * Author: Jon Trulson <jtrulson@ics.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 <iostream>
26 #include <string>
27 #include <stdexcept>
28
29 #include "guvas12d.h"
30
31 using namespace upm;
32 using namespace std;
33
GUVAS12D(int pin)34 GUVAS12D::GUVAS12D(int pin)
35 {
36 if ( !(m_aio = mraa_aio_init(pin)) )
37 {
38 throw std::invalid_argument(std::string(__FUNCTION__) +
39 ": mraa_aio_init() failed, invalid pin?");
40 return;
41 }
42 }
43
~GUVAS12D()44 GUVAS12D::~GUVAS12D()
45 {
46 mraa_aio_close(m_aio);
47 }
48
value(float aref,unsigned int samples)49 float GUVAS12D::value(float aref, unsigned int samples)
50 {
51 int val;
52 unsigned long sum = 0;
53
54 for (int i=0; i<samples; i++)
55 {
56 val = mraa_aio_read(m_aio);
57 sum += val;
58 usleep(2000);
59 }
60
61 sum = sum / samples;
62 float volts = (float)sum * aref / 1024.0;
63
64 return volts;
65 }
66