290 lines
7.5 KiB
C
290 lines
7.5 KiB
C
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_SENSOR_H
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#define ANDROID_SENSOR_H
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/******************************************************************
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*
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* IMPORTANT NOTICE:
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*
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* This file is part of Android's set of stable system headers
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* exposed by the Android NDK (Native Development Kit).
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*
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* Third-party source AND binary code relies on the definitions
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* here to be FROZEN ON ALL UPCOMING PLATFORM RELEASES.
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*
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* - DO NOT MODIFY ENUMS (EXCEPT IF YOU ADD NEW 32-BIT VALUES)
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* - DO NOT MODIFY CONSTANTS OR FUNCTIONAL MACROS
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* - DO NOT CHANGE THE SIGNATURE OF FUNCTIONS IN ANY WAY
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* - DO NOT CHANGE THE LAYOUT OR SIZE OF STRUCTURES
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*/
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/*
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* Structures and functions to receive and process sensor events in
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* native code.
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*
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*/
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#include <sys/types.h>
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#include <android/looper.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Sensor types
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* (keep in sync with hardware/sensor.h)
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*/
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enum {
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ASENSOR_TYPE_ACCELEROMETER = 1,
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ASENSOR_TYPE_MAGNETIC_FIELD = 2,
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ASENSOR_TYPE_GYROSCOPE = 4,
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ASENSOR_TYPE_LIGHT = 5,
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ASENSOR_TYPE_PROXIMITY = 8
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};
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/*
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* Sensor accuracy measure
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*/
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enum {
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ASENSOR_STATUS_UNRELIABLE = 0,
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ASENSOR_STATUS_ACCURACY_LOW = 1,
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ASENSOR_STATUS_ACCURACY_MEDIUM = 2,
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ASENSOR_STATUS_ACCURACY_HIGH = 3
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};
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/*
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* A few useful constants
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*/
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/* Earth's gravity in m/s^2 */
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#define ASENSOR_STANDARD_GRAVITY (9.80665f)
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/* Maximum magnetic field on Earth's surface in uT */
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#define ASENSOR_MAGNETIC_FIELD_EARTH_MAX (60.0f)
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/* Minimum magnetic field on Earth's surface in uT*/
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#define ASENSOR_MAGNETIC_FIELD_EARTH_MIN (30.0f)
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/*
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* A sensor event.
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*/
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/* NOTE: Must match hardware/sensors.h */
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typedef struct ASensorVector {
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union {
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float v[3];
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struct {
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float x;
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float y;
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float z;
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};
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struct {
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float azimuth;
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float pitch;
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float roll;
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};
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};
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int8_t status;
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uint8_t reserved[3];
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} ASensorVector;
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typedef struct AMetaDataEvent {
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int32_t what;
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int32_t sensor;
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} AMetaDataEvent;
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typedef struct AUncalibratedEvent {
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union {
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float uncalib[3];
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struct {
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float x_uncalib;
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float y_uncalib;
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float z_uncalib;
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};
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};
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union {
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float bias[3];
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struct {
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float x_bias;
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float y_bias;
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float z_bias;
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};
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};
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} AUncalibratedEvent;
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/* NOTE: Must match hardware/sensors.h */
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typedef struct ASensorEvent {
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int32_t version; /* sizeof(struct ASensorEvent) */
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int32_t sensor;
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int32_t type;
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int32_t reserved0;
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int64_t timestamp;
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union {
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union {
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float data[16];
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ASensorVector vector;
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ASensorVector acceleration;
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ASensorVector magnetic;
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float temperature;
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float distance;
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float light;
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float pressure;
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float relative_humidity;
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AUncalibratedEvent uncalibrated_gyro;
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AUncalibratedEvent uncalibrated_magnetic;
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AMetaDataEvent meta_data;
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};
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union {
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uint64_t data[8];
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uint64_t step_counter;
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} u64;
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};
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int32_t reserved1[4];
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} ASensorEvent;
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struct ASensorManager;
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typedef struct ASensorManager ASensorManager;
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struct ASensorEventQueue;
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typedef struct ASensorEventQueue ASensorEventQueue;
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struct ASensor;
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typedef struct ASensor ASensor;
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typedef ASensor const* ASensorRef;
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typedef ASensorRef const* ASensorList;
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/*****************************************************************************/
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/*
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* Get a reference to the sensor manager. ASensorManager is a singleton.
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*
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* Example:
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*
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* ASensorManager* sensorManager = ASensorManager_getInstance();
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*
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*/
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ASensorManager* ASensorManager_getInstance();
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/*
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* Returns the list of available sensors.
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*/
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int ASensorManager_getSensorList(ASensorManager* manager, ASensorList* list);
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/*
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* Returns the default sensor for the given type, or NULL if no sensor
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* of that type exist.
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*/
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ASensor const* ASensorManager_getDefaultSensor(ASensorManager* manager, int type);
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/*
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* Creates a new sensor event queue and associate it with a looper.
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*/
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ASensorEventQueue* ASensorManager_createEventQueue(ASensorManager* manager,
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ALooper* looper, int ident, ALooper_callbackFunc callback, void* data);
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/*
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* Destroys the event queue and free all resources associated to it.
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*/
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int ASensorManager_destroyEventQueue(ASensorManager* manager, ASensorEventQueue* queue);
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/*****************************************************************************/
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/*
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* Enable the selected sensor. Returns a negative error code on failure.
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*/
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int ASensorEventQueue_enableSensor(ASensorEventQueue* queue, ASensor const* sensor);
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/*
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* Disable the selected sensor. Returns a negative error code on failure.
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*/
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int ASensorEventQueue_disableSensor(ASensorEventQueue* queue, ASensor const* sensor);
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/*
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* Sets the delivery rate of events in microseconds for the given sensor.
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* Note that this is a hint only, generally event will arrive at a higher
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* rate. It is an error to set a rate inferior to the value returned by
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* ASensor_getMinDelay().
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* Returns a negative error code on failure.
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*/
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int ASensorEventQueue_setEventRate(ASensorEventQueue* queue, ASensor const* sensor, int32_t usec);
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/*
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* Returns true if there are one or more events available in the
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* sensor queue. Returns 1 if the queue has events; 0 if
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* it does not have events; and a negative value if there is an error.
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*/
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int ASensorEventQueue_hasEvents(ASensorEventQueue* queue);
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/*
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* Returns the next available events from the queue. Returns a negative
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* value if no events are available or an error has occurred, otherwise
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* the number of events returned.
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*
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* Examples:
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* ASensorEvent event;
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* ssize_t numEvent = ASensorEventQueue_getEvents(queue, &event, 1);
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*
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* ASensorEvent eventBuffer[8];
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* ssize_t numEvent = ASensorEventQueue_getEvents(queue, eventBuffer, 8);
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*
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*/
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ssize_t ASensorEventQueue_getEvents(ASensorEventQueue* queue,
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ASensorEvent* events, size_t count);
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/*****************************************************************************/
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/*
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* Returns this sensor's name (non localized)
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*/
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const char* ASensor_getName(ASensor const* sensor);
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/*
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* Returns this sensor's vendor's name (non localized)
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*/
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const char* ASensor_getVendor(ASensor const* sensor);
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/*
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* Return this sensor's type
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*/
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int ASensor_getType(ASensor const* sensor);
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/*
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* Returns this sensors's resolution
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*/
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float ASensor_getResolution(ASensor const* sensor);
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/*
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* Returns the minimum delay allowed between events in microseconds.
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* A value of zero means that this sensor doesn't report events at a
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* constant rate, but rather only when a new data is available.
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*/
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int ASensor_getMinDelay(ASensor const* sensor);
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#ifdef __cplusplus
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};
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#endif
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#endif // ANDROID_SENSOR_H
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