GravitySensor.h revision 50b66767f6c5635430483393e17d15969dfe2f05 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_GRAVITY_SENSOR_H
18#define ANDROID_GRAVITY_SENSOR_H
19
20#include <stdint.h>
21#include <sys/types.h>
22
23#include <gui/Sensor.h>
24
25#include "SensorDevice.h"
26#include "SensorInterface.h"
27#include "SecondOrderLowPassFilter.h"
28
29// ---------------------------------------------------------------------------
30namespace android {
31// ---------------------------------------------------------------------------
32
33class GravitySensor : public SensorInterface {
34    SensorDevice& mSensorDevice;
35    Sensor mAccelerometer;
36    double mAccTime;
37
38    SecondOrderLowPassFilter mLowPass;
39    CascadedBiquadFilter mX, mY, mZ;
40
41public:
42    GravitySensor(sensor_t const* list, size_t count);
43    virtual bool process(sensors_event_t* outEvent,
44            const sensors_event_t& event);
45    virtual status_t activate(void* ident, bool enabled);
46    virtual status_t setDelay(void* ident, int handle, int64_t ns);
47    virtual Sensor getSensor() const;
48    virtual bool isVirtual() const { return true; }
49};
50
51// ---------------------------------------------------------------------------
52}; // namespace android
53
54#endif // ANDROID_GRAVITY_SENSOR_H
55