1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/****************************************************************************
**
** Copyright (C) 2012 Research In Motion
** Contact: http://www.qt-project.org/
**
** This file is part of the QtSensors module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "bbmagnetometer.h"
BbMagnetometer::BbMagnetometer(QSensor *sensor)
: BbSensorBackend<QMagnetometerReading>(devicePath(), SENSOR_TYPE_MAGNETOMETER, sensor)
{
setDescription(QLatin1String("Magnetic flux density in Teslas (T)"));
}
QString BbMagnetometer::devicePath()
{
return QLatin1String("/dev/sensor/mag");
}
bool BbMagnetometer::updateReadingFromEvent(const sensor_event_t &event, QMagnetometerReading *reading)
{
// TODO: In the future, support returnGeoValues here. Right now, /dev/sensors/mag has no
// geomagnatic mode, but will gain it in the future.
float x = convertValue(event.motion.dsp.x);
float y = convertValue(event.motion.dsp.y);
float z = convertValue(event.motion.dsp.z);
remapAxes(&x, &y, &z);
reading->setX(x);
reading->setY(y);
reading->setZ(z);
const bool returnGeoValues = sensor()->property("returnGeoValues").toBool();
if (returnGeoValues) {
switch (event.accuracy) {
case SENSOR_ACCURACY_UNRELIABLE: reading->setCalibrationLevel(0.0f); break;
case SENSOR_ACCURACY_LOW: reading->setCalibrationLevel(0.1f); break;
// We determined that MEDIUM should map to 1.0, because existing code samples
// show users should pop a calibration screen when seeing < 1.0. The MEDIUM accuracy
// is actually good enough not to require calibration, so we don't want to make it seem
// like it is required artificially.
case SENSOR_ACCURACY_MEDIUM: reading->setCalibrationLevel(1.0f); break;
case SENSOR_ACCURACY_HIGH: reading->setCalibrationLevel(1.0f); break;
}
} else {
reading->setCalibrationLevel(1.0f);
}
return true;
}
qreal BbMagnetometer::convertValue(float bbValueInMicroTesla)
{
// Convert from microtesla to tesla
return bbValueInMicroTesla * 1.0e-6;
}
|
