diff -r cfcbf08528c4 -r 2b40d63a9c3d qtmobility/plugins/sensors/n900/n900accelerometer.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/qtmobility/plugins/sensors/n900/n900accelerometer.cpp Fri Apr 16 15:51:22 2010 +0300 @@ -0,0 +1,81 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the Qt Mobility Components. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "n900accelerometer.h" +#include +#include + +const char *n900accelerometer::id("n900.accelerometer"); +const char *n900accelerometer::filename("/sys/class/i2c-adapter/i2c-3/3-001d/coord"); + +n900accelerometer::n900accelerometer(QSensor *sensor) + : n900filebasedsensor(sensor) +{ + setReading(&m_reading); +} + +void n900accelerometer::poll() +{ + // Note that this is a rather inefficient way to generate this data. + // Ideally the kernel would scale the hardware's values to m/s^2 for us + // and give us a timestamp along with that data. + + FILE *fd = fopen(filename, "r"); + if (!fd) return; + int x, y, z; + int rs = fscanf(fd, "%i %i %i", &x, &y, &z); + fclose(fd); + if (rs != 3) return; + + // Convert from milli-Gs to meters per second per second + // Using 1 G = 9.80665 m/s^2 + qreal ax = x * 0.00980665; + qreal ay = y * -0.00980665; + qreal az = z * -0.00980665; + + m_reading.setTimestamp(clock()); + m_reading.setX(ax); + m_reading.setY(ay); + m_reading.setZ(az); + + newReadingAvailable(); +} +