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e51c5f3018
aio: mraa_aio_read (v1.0.0) can now return -1, treat that in sensors using it Adds alot of exceptions if the aio read goes wrong Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com> Signed-off-by: Noel Eck <noel.eck@intel.com>
120 lines
2.9 KiB
C++
120 lines
2.9 KiB
C++
/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2014 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 <string>
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#include <stdexcept>
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#include "ta12200.hpp"
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using namespace upm;
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using namespace std;
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TA12200::TA12200(int pin)
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{
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initClock();
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if ( !(m_aio = mraa_aio_init(pin)) )
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{
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throw std::invalid_argument(std::string(__FUNCTION__) +
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": mraa_aio_init() failed, invalid pin?");
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return;
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}
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}
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TA12200::~TA12200()
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{
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mraa_aio_close(m_aio);
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}
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void TA12200::initClock()
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{
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gettimeofday(&m_startTime, NULL);
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}
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uint32_t TA12200::getMillis()
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{
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struct timeval elapsed, now;
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uint32_t elapse;
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// get current time
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gettimeofday(&now, NULL);
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// compute the delta since m_startTime
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if( (elapsed.tv_usec = now.tv_usec - m_startTime.tv_usec) < 0 )
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{
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elapsed.tv_usec += 1000000;
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elapsed.tv_sec = now.tv_sec - m_startTime.tv_sec - 1;
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}
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else
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{
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elapsed.tv_sec = now.tv_sec - m_startTime.tv_sec;
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}
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elapse = (uint32_t)((elapsed.tv_sec * 1000) + (elapsed.tv_usec / 1000));
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// never return 0
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if (elapse == 0)
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elapse = 1;
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return elapse;
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}
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int TA12200::highestValue()
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{
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int hiVal = 0;
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int val;
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uint32_t start = getMillis();
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// 1 second
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while (getMillis() < (start + 1000))
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{
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val = mraa_aio_read(m_aio);
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if (val == -1) {
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return -1;
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}
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if (val > hiVal) {
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hiVal = val;
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}
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}
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return hiVal;
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}
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float TA12200::milliAmps(unsigned int val, int res)
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{
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float ampCurrent;
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float effectiveVal;
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// From grove wiki page:
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// minimum_current=1/1024*5/800*2000000/1.414=8.6(mA)
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// Only for sinusoidal alternating current
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//ampCurrent = float(val) / float(res) * 5.0 / 800.0 * 2000000.0;
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ampCurrent = float(val) / float(res) * 12500.0;
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effectiveVal = ampCurrent/1.414;
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return (effectiveVal);
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}
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