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/*
* 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 "hdxxvxta.hpp"
using namespace upm;
using namespace std;
// conversion from celcius to fahrenheit
static float c2f(float c)
{
return (c * (9.0 / 5.0) + 32.0);
}
HDXXVXTA::HDXXVXTA(int hPin, int tPin, float aref) :
m_aioHum(hPin), m_aioTemp(0)
{
if (tPin >= 0)
m_hasTemp = true;
else
m_hasTemp = false;
m_temperature = 0.0;
m_humidity = 0.0;
if (m_hasTemp)
{
m_aioTemp = new mraa::Aio(tPin);
m_aResTemp = (1 << m_aioTemp->getBit());
}
else
m_aResTemp = 0;
m_aResHum = (1 << m_aioHum.getBit());
m_aref = aref;
// set the default temperature range to the A1 series (-40C-50C),
// regardless of whether temperature measuring is enabled
setRange(RANGE_MINUS40_50);
}
HDXXVXTA::~HDXXVXTA()
{
if (m_aioTemp)
delete m_aioTemp;
}
void HDXXVXTA::update()
{
// temperature
int val;
float volts;
if (m_hasTemp)
{
val = m_aioTemp->read();
volts = (float(val) * (m_aref / m_aResTemp));
switch (m_range)
{
case RANGE_MINUS40_50:
// valid range is 50 + abs(-40) = 90
m_temperature = ((volts / m_aref) * 90.0) - 40.0;
break;
case RANGE_0_50:
// valid range is 50
m_temperature = ((volts / m_aref) * 50.0);
break;
default:
// shouldn't happen, but...
throw std::out_of_range(std::string(__FUNCTION__) +
": internal error, invalid range value");
break;
}
}
// humidity
val = m_aioHum.read();
volts = (float(val) * (m_aref / m_aResHum));
m_humidity = ((volts / m_aref) * 100.0);
}
float HDXXVXTA::getTemperature(bool fahrenheit)
{
if (fahrenheit)
return c2f(m_temperature);
else
return m_temperature;
}
float HDXXVXTA::getHumidity()
{
return m_humidity;
}
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