peripheral/libupm/src/tb7300/tb7300.cxx

/*
 * 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 <unistd.h>
#include <errno.h>
#include <iostream>
#include <stdexcept>
#include <string>

#include "tb7300.hpp"

using namespace upm;
using namespace std;

// conversion from fahrenheit to celcius and back

static float f2c(float f)
{
  return ((f - 32.0) / (9.0 / 5.0));
}

static float c2f(float c)
{
  return (c * (9.0 / 5.0) + 32.0);
}


TB7300::TB7300(uint32_t targetDeviceObjectID) :
  BACNETUTIL(targetDeviceObjectID)
{
  setDebug(false);

  // we disable this by default for performance reasons
  checkReliability(false);

  m_isTempInitialized = false;
  m_isCelcius = false;

  // room temperature only
  m_temperature = 0.0;
}

TB7300::~TB7300()
{
}

void TB7300::update()
{
  if (!m_isTempInitialized)
    {
      // this will update internals so conversions work properly
      getTemperatureScale();
    }

  float tmpF = getAnalogValue(AV_Room_Temperature);

  if (m_isCelcius)
    m_temperature = tmpF;
  else
    m_temperature = f2c(tmpF);
}

float TB7300::getTemperature(bool fahrenheit)
{
  if (fahrenheit)
    return c2f(m_temperature);
  else
    return m_temperature;
}

void TB7300::setTemperatureScale(bool fahrenheit)
{
  setBinaryValue(BV_Temperature_Scale, fahrenheit);

  m_isTempInitialized = true;
  m_isCelcius = (fahrenheit) ? false : true;
}

bool TB7300::getTemperatureScale()
{
  bool scale = getBinaryValue(BV_Temperature_Scale);

  m_isTempInitialized = true;
  m_isCelcius = !scale;

  return scale;
}