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a3a1fdc81b
This commit addresses all warnings emitted from -Wunused-variable in the C++ src. Signed-off-by: Noel Eck <noel.eck@intel.com>
94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
/*
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* Author: Scott Ware <scott.r.ware@intel.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 <unistd.h>
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#include <stdlib.h>
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#include <math.h>
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#include "max44009.hpp"
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using namespace upm;
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MAX44009::MAX44009 (int bus, int devAddr) {
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m_maxControlAddr = devAddr;
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i2c = new mraa::I2c(bus);
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i2c->address(m_maxControlAddr);
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// Reset chip to defaults
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status = mraa::SUCCESS;
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reset();
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if (status != mraa::SUCCESS)
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UPM_THROW("config failure");
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}
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MAX44009::~MAX44009() {
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delete i2c;
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}
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mraa::Result
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MAX44009::reset() {
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uint8_t address[5] = {MAX44009_INT_ENABLE_ADDR, MAX44009_CONFIG_ADDR, \
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MAX44009_THR_HIGH_ADDR, MAX44009_THR_LOW_ADDR, \
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MAX44009_THR_TIMER_ADDR};
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uint8_t value[5] = {MAX44009_INT_DISABLED, MAX44009_DEFAULT_CONFIGURATION, \
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0xFF, 0x00, 0xFF};
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uint8_t i;
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for (i = 0; i < sizeof(address) && status == mraa::SUCCESS; i++) {
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status = i2c->writeReg(address[i], value[i]);
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}
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return status;
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}
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uint16_t
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MAX44009::getVisibleRaw() {
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uint8_t data[MAX44009_LUX_LENGTH];
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uint16_t* value = reinterpret_cast<uint16_t*>(&data[0]);
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int length = i2c->readBytesReg(MAX44009_LUX_START_ADDR, data, MAX44009_LUX_LENGTH);
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if(length != MAX44009_LUX_LENGTH)
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UPM_THROW("Read error");
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return *value;
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}
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double
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MAX44009::getVisibleLux() {
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uint16_t rawValue = getVisibleRaw();
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uint8_t rawValueMsb = rawValue >> 8;
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uint8_t rawValueLsb = rawValue & 0xFF;
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uint8_t exponent = (( rawValueMsb & 0xF0 ) >> 4);
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uint8_t mantissa = (( rawValueMsb & 0x0F ) << 4 ) | ( rawValueLsb & 0x0F );
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// Check for overrange condition
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if(exponent == MAX44009_OVERRANGE_CONDITION)
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UPM_THROW("Overrange error");
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return pow((double)2,(double)exponent) * mantissa * 0.045;
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}
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