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
31using namespace upm;
32using namespace std;
33
34GUVAS12D::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
44GUVAS12D::~GUVAS12D()
45{
46  mraa_aio_close(m_aio);
47}
48
49float 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