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b608232cb9
Multiple changes related to building the vdiv c source w/c example.
* Renamed GroveVdiv to vdiv (all cases) throughout source, examples,
directory names, and documentation.
* Added C source.
* Tested C sensor code on edison
* Updated CMakeLists.txt for examples-c to build from
<sensorname>-c. This was a small change to get c examples to build
for sensors in which the C++ does NOT wrap the C.
* Added C example for vdiv.
Signed-off-by: Noel Eck <noel.eck@intel.com>
69 lines
1.9 KiB
C++
69 lines
1.9 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 "vdiv.hpp"
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using namespace upm;
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using namespace std;
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VDiv::VDiv(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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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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VDiv::~VDiv()
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{
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mraa_aio_close(m_aio);
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}
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unsigned int VDiv::value(unsigned int samples)
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{
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unsigned int sum = 0;
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for (int i=0; i<samples; i++)
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{
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sum += mraa_aio_read(m_aio);
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if (sum == -1) return 0;
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usleep(2000);
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}
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return (sum / samples);
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}
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float VDiv::computedValue(uint8_t gain, unsigned int val, int vref, int res)
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{
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return ((float(gain) * float(val) * float(vref) / float(res)) / 1000.0);
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}
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