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77be6adf6d
Additionally, add some error checking in the constructor, and determine the ADC resolution and use that in the voltage calculation rather than a hardcoded 1024.0. Signed-off-by: Jon Trulson <jtrulson@ics.com> Signed-off-by: Zion Orent <zorent@ics.com> Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2015 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 "gp2y0a.h"
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using namespace std;
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using namespace upm;
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GP2Y0A::GP2Y0A(int pin)
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{
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if (!(m_aio = mraa_aio_init(pin)))
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{
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cerr << __FUNCTION__ << "mraa_aio_init() failed." << endl;
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return;
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}
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// get the ADC resolution
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m_aRes = (1 << mraa_aio_get_bit(m_aio));
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}
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GP2Y0A::~GP2Y0A()
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{
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mraa_aio_close(m_aio);
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}
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float GP2Y0A::value(float aref, uint8_t samples)
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{
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int val;
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int sum = 0;
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for (int i=0; i<samples; i++)
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{
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val = mraa_aio_read(m_aio);
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sum += val;
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}
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val = sum / samples;
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float volts = float(val) * aref / float(m_aRes);
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return volts;
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}
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