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123 lines
3.0 KiB
C++
123 lines
3.0 KiB
C++
/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2016 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <iostream>
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#include "hdxxvxta.hpp"
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using namespace upm;
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using namespace std;
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// conversion from celsius to fahrenheit
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static float c2f(float c)
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{
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return (c * (9.0 / 5.0) + 32.0);
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}
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HDXXVXTA::HDXXVXTA(int hPin, int tPin, float aref) :
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m_aioHum(hPin), m_aioTemp(0)
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{
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if (tPin >= 0)
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m_hasTemp = true;
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else
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m_hasTemp = false;
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m_temperature = 0.0;
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m_humidity = 0.0;
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if (m_hasTemp)
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{
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m_aioTemp = new mraa::Aio(tPin);
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m_aResTemp = (1 << m_aioTemp->getBit());
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}
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else
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m_aResTemp = 0;
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m_aResHum = (1 << m_aioHum.getBit());
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m_aref = aref;
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// set the default temperature range to the A1 series (-40C-50C),
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// regardless of whether temperature measuring is enabled
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setRange(RANGE_MINUS40_50);
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}
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HDXXVXTA::~HDXXVXTA()
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{
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if (m_aioTemp)
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delete m_aioTemp;
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}
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void HDXXVXTA::update()
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{
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// temperature
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int val;
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float volts;
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if (m_hasTemp)
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{
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val = m_aioTemp->read();
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volts = (float(val) * (m_aref / m_aResTemp));
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switch (m_range)
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{
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case RANGE_MINUS40_50:
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// valid range is 50 + abs(-40) = 90
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m_temperature = ((volts / m_aref) * 90.0) - 40.0;
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break;
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case RANGE_0_50:
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// valid range is 50
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m_temperature = ((volts / m_aref) * 50.0);
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break;
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default:
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// shouldn't happen, but...
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throw std::out_of_range(std::string(__FUNCTION__) +
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": internal error, invalid range value");
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break;
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}
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}
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// humidity
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val = m_aioHum.read();
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volts = (float(val) * (m_aref / m_aResHum));
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m_humidity = ((volts / m_aref) * 100.0);
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}
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float HDXXVXTA::getTemperature(bool fahrenheit)
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{
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if (fahrenheit)
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return c2f(m_temperature);
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else
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return m_temperature;
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}
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float HDXXVXTA::getHumidity()
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{
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return m_humidity;
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}
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