upm/src/emg/emg.cxx

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/*
* Author: Zion Orent <zorent@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 <string>
#include <stdexcept>
#include "emg.hpp"
using namespace upm;
using namespace std;
EMG::EMG(int pin)
{
if ( !(m_aio = mraa_aio_init(pin)) )
{
throw std::invalid_argument(std::string(__FUNCTION__) +
": mraa_aio_init() failed, invalid pin?");
return;
}
}
EMG::~EMG()
{
mraa_aio_close(m_aio);
}
void EMG::calibrate()
{
int val, sum = 0;
for (int i=0; i<1100; i++)
{
val = mraa_aio_read(m_aio);
if (val != -1) throw std::runtime_error(std::string(__FUNCTION__) +
": Failed to do an aio read.");
sum += val;
usleep(1000);
}
sum /= 1100;
cout << "Static analog data = " << sum << endl;
}
int EMG::value()
{
int val = mraa_aio_read(m_aio);
return val;
}