mirror of
https://github.com/eclipse/upm.git
synced 2025-03-17 05:57:29 +03:00
126 lines
3.1 KiB
C++
126 lines
3.1 KiB
C++
/*
|
|
* Author: Jon Trulson <jtrulson@ics.com>
|
|
* Copyright (c) 2016 Intel Corporation.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
#include <iostream>
|
|
|
|
#include "teams.hpp"
|
|
|
|
using namespace upm;
|
|
using namespace std;
|
|
|
|
// for current loop reads that seems a little noisy, we average over
|
|
// several aio reads.
|
|
static const int maxSamples = 50;
|
|
|
|
// conversion from celsius to fahrenheit
|
|
|
|
static float c2f(float c)
|
|
{
|
|
return (c * (9.0 / 5.0) + 32.0);
|
|
}
|
|
|
|
|
|
TEAMS::TEAMS(int tPin, float rResistor, float aref) :
|
|
m_aioTemp(tPin)
|
|
{
|
|
if (rResistor < 0.0)
|
|
{
|
|
throw std::out_of_range(std::string(__FUNCTION__) +
|
|
": rResistor must be >= 0.0");
|
|
}
|
|
|
|
m_aResTemp = (1 << m_aioTemp.getBit());
|
|
|
|
m_temperature = 0.0;
|
|
|
|
m_aref = aref;
|
|
m_rResistor = rResistor;
|
|
m_connected = false;
|
|
|
|
// this will only be non-zero when using a direct 4-20ma interface
|
|
// like libelium
|
|
m_rawMilliamps = 0.0;
|
|
|
|
m_offset = 0.0;
|
|
}
|
|
|
|
TEAMS::~TEAMS()
|
|
{
|
|
}
|
|
|
|
void TEAMS::update()
|
|
{
|
|
float milliamps = 0.0;
|
|
|
|
int val = average(maxSamples);
|
|
float volts = (float(val) * (m_aref / m_aResTemp));
|
|
|
|
// valid temp range is 25.0 (35C - 10C), current loop range is 16ma
|
|
// (20ma - 4ma)
|
|
if (m_rResistor)
|
|
{
|
|
// direct 4-20 current loop interface
|
|
milliamps = (volts / m_rResistor * 1000.0) + m_offset;
|
|
m_rawMilliamps = milliamps;
|
|
|
|
// subtract 0 (4ma) value
|
|
milliamps -= 4.0;
|
|
if (milliamps < 0.0) // not connected
|
|
{
|
|
milliamps = 0.0;
|
|
m_connected = false;
|
|
}
|
|
else
|
|
m_connected = true;
|
|
|
|
m_temperature = (milliamps * (25.0 / 16.0)) + 10.0;
|
|
}
|
|
else
|
|
{
|
|
// normal analog read, already scaled to 0-5v, always connected
|
|
m_temperature = ((volts / m_aref) * 25.0) + 10.0;
|
|
m_connected = true;
|
|
}
|
|
}
|
|
|
|
float TEAMS::getTemperature(bool fahrenheit)
|
|
{
|
|
if (fahrenheit)
|
|
return c2f(m_temperature);
|
|
else
|
|
return m_temperature;
|
|
}
|
|
|
|
int TEAMS::average(int samples)
|
|
{
|
|
if (samples <= 0)
|
|
samples = 1;
|
|
|
|
int avg = 0;
|
|
for (int i=0; i<samples; i++)
|
|
avg += m_aioTemp.read();
|
|
|
|
return (avg / samples);
|
|
}
|