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 <iostream>
26 #include "lm35.h"
27 
28 using namespace std;
29 using namespace upm;
30 
LM35(int pin,float aref)31 LM35::LM35(int pin, float aref) :
32   m_aio(pin)
33 {
34   m_aRes = m_aio.getBit();
35   m_aref = aref;
36 }
37 
~LM35()38 LM35::~LM35()
39 {
40 }
41 
getTemperature()42 float LM35::getTemperature()
43 {
44   int val = m_aio.read();
45 
46   // convert to mV
47   float temp = (float(val) * (m_aref / float(1 << m_aRes))) * 1000.0;
48 
49   // 10mV/degree C
50   return(temp / 10.0);
51 }
52