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8d3e29a695
This module implements support for the Grove Voltage Divider. jrvandr: Removed unecessary mraa_init() from grovevdiv.cxx Signed-off-by: Jon Trulson <jtrulson@ics.com> Signed-off-by: Zion Orent <zorent@ics.com> Signed-off-by: John Van Drasek <john.r.van.drasek@intel.com>
88 lines
2.5 KiB
C++
88 lines
2.5 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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#pragma once
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#include <string>
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#include <iostream>
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#include <stdint.h>
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#include <mraa/aio.h>
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// ref voltage in millivolts
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#define GROVEVDIV_VREF 4980
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// default ADC resolution.
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#define GROVEVDIV_ADC_RES 1024
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namespace upm {
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/**
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* @brief C++ API for the Grove Voltage Divider Sensor
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*
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* UPM module for the Grove Voltage Divider Sensor
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*
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* @ingroup grove analog
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* @snippet grovevdiv.cxx Interesting
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*/
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class GroveVDiv {
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public:
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/**
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* Grove Voltage Divider sensor constructor
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*
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* @param pin analog pin to use
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*/
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GroveVDiv(int pin);
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/**
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* Grove Voltage Divider Destructor
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*/
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~GroveVDiv();
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/**
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* Get the conversion value from the sensor
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*
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* @param samples specifies how many samples to average over
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* @return the averaged ADC conversion value
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*/
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unsigned int value(unsigned int samples);
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/**
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* Compute the measured voltage
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*
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* @param gain gain switch, either 3 or 10 for grove
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* @param val measured voltage (from value())
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* @param vref reference voltage in millivolts
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* @param res ADC resolution
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*
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* @return the measured voltage
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*/
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float computedValue(uint8_t gain, uint16_t val, int vref=GROVEVDIV_VREF,
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int res=GROVEVDIV_ADC_RES);
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private:
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mraa_aio_context m_aio;
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};
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}
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