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/*
* Author: Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2014 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 <string>
#include <stdexcept>
#include "ta12200.hpp"
using namespace upm;
using namespace std;
TA12200::TA12200(int pin)
{
initClock();
if ( !(m_aio = mraa_aio_init(pin)) )
{
throw std::invalid_argument(std::string(__FUNCTION__) +
": mraa_aio_init() failed, invalid pin?");
return;
}
}
TA12200::~TA12200()
{
mraa_aio_close(m_aio);
}
void TA12200::initClock()
{
gettimeofday(&m_startTime, NULL);
}
uint32_t TA12200::getMillis()
{
struct timeval elapsed, now;
uint32_t elapse;
// get current time
gettimeofday(&now, NULL);
// compute the delta since m_startTime
if( (elapsed.tv_usec = now.tv_usec - m_startTime.tv_usec) < 0 )
{
elapsed.tv_usec += 1000000;
elapsed.tv_sec = now.tv_sec - m_startTime.tv_sec - 1;
}
else
{
elapsed.tv_sec = now.tv_sec - m_startTime.tv_sec;
}
elapse = (uint32_t)((elapsed.tv_sec * 1000) + (elapsed.tv_usec / 1000));
// never return 0
if (elapse == 0)
elapse = 1;
return elapse;
}
int TA12200::highestValue()
{
int hiVal = 0;
int val;
uint32_t start = getMillis();
// 1 second
while (getMillis() < (start + 1000))
{
val = mraa_aio_read(m_aio);
if (val == -1) {
return -1;
}
if (val > hiVal) {
hiVal = val;
}
}
return hiVal;
}
float TA12200::milliAmps(unsigned int val, int res)
{
float ampCurrent;
float effectiveVal;
// From grove wiki page:
// minimum_current=1/1024*5/800*2000000/1.414=8.6(mA)
// Only for sinusoidal alternating current
//ampCurrent = float(val) / float(res) * 5.0 / 800.0 * 2000000.0;
ampCurrent = float(val) / float(res) * 12500.0;
effectiveVal = ampCurrent/1.414;
return (effectiveVal);
}
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