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 "grovevdiv.h"
30 
31 using namespace upm;
32 using namespace std;
33 
GroveVDiv(int pin)34 GroveVDiv::GroveVDiv(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 
~GroveVDiv()44 GroveVDiv::~GroveVDiv()
45 {
46   mraa_aio_close(m_aio);
47 }
48 
value(unsigned int samples)49 unsigned int GroveVDiv::value(unsigned int samples)
50 {
51   unsigned int sum = 0;
52 
53   for (int i=0; i<samples; i++)
54     {
55       sum += mraa_aio_read(m_aio);
56       usleep(2000);
57     }
58 
59   return (sum / samples);
60 }
61 
computedValue(uint8_t gain,unsigned int val,int vref,int res)62 float GroveVDiv::computedValue(uint8_t gain, unsigned int val, int vref, int res)
63 {
64   return ((float(gain) * float(val) * float(vref) / float(res)) / 1000.0);
65 
66 }
67 
68