upm/src/dfrph/dfrph.cxx

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/*
* Author: Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2015 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 <stdexcept>
#include "dfrph.hpp"
using namespace upm;
DFRPH::DFRPH(int pin, float vref) : _dev(dfrph_init(pin))
{
if (_dev == NULL)
throw std::invalid_argument(std::string(__FUNCTION__) +
": dfrph_init() failed, invalid pin?");
}
DFRPH::~DFRPH()
{
dfrph_close(_dev);
}
void DFRPH::setOffset(float offset)
{
dfrph_set_offset(_dev, offset);
}
void DFRPH::setScale(float scale)
{
dfrph_set_scale(_dev, scale);
}
float DFRPH::volts()
{
float volts = 0.0;
dfrph_get_raw_volts(_dev, &volts);
return volts;
}
float DFRPH::pH(unsigned int samples)
{
float ph_avg = 0.0;
// Read at least 1 sample
if (samples == 0) samples = 1;
float ph = 0.0;
for (int i =0; i < samples; i++)
{
dfrph_get_ph(_dev, &ph);
ph_avg += ph;
}
return ph_avg/samples;
}