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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @addtogroup Sensor
* @{
*/
/**
* @file sensor.h
*/
#ifndef ANDROID_SENSOR_H
#define ANDROID_SENSOR_H
/******************************************************************
*
* IMPORTANT NOTICE:
*
* This file is part of Android's set of stable system headers
* exposed by the Android NDK (Native Development Kit).
*
* Third-party source AND binary code relies on the definitions
* here to be FROZEN ON ALL UPCOMING PLATFORM RELEASES.
*
* - DO NOT MODIFY ENUMS (EXCEPT IF YOU ADD NEW 32-BIT VALUES)
* - DO NOT MODIFY CONSTANTS OR FUNCTIONAL MACROS
* - DO NOT CHANGE THE SIGNATURE OF FUNCTIONS IN ANY WAY
* - DO NOT CHANGE THE LAYOUT OR SIZE OF STRUCTURES
*/
/**
* Structures and functions to receive and process sensor events in
* native code.
*
*/
#include <sys/types.h>
#include <android/looper.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* Sensor types.
* (keep in sync with hardware/sensors.h)
*/
enum {
/**
* {@link ASENSOR_TYPE_ACCELEROMETER}
* reporting-mode: continuous
*
* All values are in SI units (m/s^2) and measure the acceleration of the
* device minus the force of gravity.
*/
ASENSOR_TYPE_ACCELEROMETER = 1,
/**
* {@link ASENSOR_TYPE_MAGNETIC_FIELD}
* reporting-mode: continuous
*
* All values are in micro-Tesla (uT) and measure the geomagnetic
* field in the X, Y and Z axis.
*/
ASENSOR_TYPE_MAGNETIC_FIELD = 2,
/**
* {@link ASENSOR_TYPE_GYROSCOPE}
* reporting-mode: continuous
*
* All values are in radians/second and measure the rate of rotation
* around the X, Y and Z axis.
*/
ASENSOR_TYPE_GYROSCOPE = 4,
/**
* {@link ASENSOR_TYPE_LIGHT}
* reporting-mode: on-change
*
* The light sensor value is returned in SI lux units.
*/
ASENSOR_TYPE_LIGHT = 5,
/**
* {@link ASENSOR_TYPE_PROXIMITY}
* reporting-mode: on-change
*
* The proximity sensor which turns the screen off and back on during calls is the
* wake-up proximity sensor. Implement wake-up proximity sensor before implementing
* a non wake-up proximity sensor. For the wake-up proximity sensor set the flag
* SENSOR_FLAG_WAKE_UP.
* The value corresponds to the distance to the nearest object in centimeters.
*/
ASENSOR_TYPE_PROXIMITY = 8,
/**
* {@link ASENSOR_TYPE_LINEAR_ACCELERATION}
* reporting-mode: continuous
*
* All values are in SI units (m/s^2) and measure the acceleration of the
* device not including the force of gravity.
*/
ASENSOR_TYPE_LINEAR_ACCELERATION = 10
};
/**
* Sensor accuracy measure.
*/
enum {
/** no contact */
ASENSOR_STATUS_NO_CONTACT = -1,
/** unreliable */
ASENSOR_STATUS_UNRELIABLE = 0,
/** low accuracy */
ASENSOR_STATUS_ACCURACY_LOW = 1,
/** medium accuracy */
ASENSOR_STATUS_ACCURACY_MEDIUM = 2,
/** high accuracy */
ASENSOR_STATUS_ACCURACY_HIGH = 3
};
/**
* Sensor Reporting Modes.
*/
enum {
/** continuous reporting */
AREPORTING_MODE_CONTINUOUS = 0,
/** reporting on change */
AREPORTING_MODE_ON_CHANGE = 1,
/** on shot reporting */
AREPORTING_MODE_ONE_SHOT = 2,
/** special trigger reporting */
AREPORTING_MODE_SPECIAL_TRIGGER = 3
};
/*
* A few useful constants
*/
/** Earth's gravity in m/s^2 */
#define ASENSOR_STANDARD_GRAVITY (9.80665f)
/** Maximum magnetic field on Earth's surface in uT */
#define ASENSOR_MAGNETIC_FIELD_EARTH_MAX (60.0f)
/** Minimum magnetic field on Earth's surface in uT*/
#define ASENSOR_MAGNETIC_FIELD_EARTH_MIN (30.0f)
/**
* A sensor event.
*/
/* NOTE: Must match hardware/sensors.h */
typedef struct ASensorVector {
union {
float v[3];
struct {
float x;
float y;
float z;
};
struct {
float azimuth;
float pitch;
float roll;
};
};
int8_t status;
uint8_t reserved[3];
} ASensorVector;
typedef struct AMetaDataEvent {
int32_t what;
int32_t sensor;
} AMetaDataEvent;
typedef struct AUncalibratedEvent {
union {
float uncalib[3];
struct {
float x_uncalib;
float y_uncalib;
float z_uncalib;
};
};
union {
float bias[3];
struct {
float x_bias;
float y_bias;
float z_bias;
};
};
} AUncalibratedEvent;
typedef struct AHeartRateEvent {
float bpm;
int8_t status;
} AHeartRateEvent;
typedef struct ADynamicSensorEvent {
int32_t connected;
int32_t handle;
} ADynamicSensorEvent;
typedef struct {
int32_t type;
int32_t serial;
union {
int32_t data_int32[14];
float data_float[14];
};
} AAdditionalInfoEvent;
/* NOTE: Must match hardware/sensors.h */
typedef struct ASensorEvent {
int32_t version; /* sizeof(struct ASensorEvent) */
int32_t sensor;
int32_t type;
int32_t reserved0;
int64_t timestamp;
union {
union {
float data[16];
ASensorVector vector;
ASensorVector acceleration;
ASensorVector magnetic;
float temperature;
float distance;
float light;
float pressure;
float relative_humidity;
AUncalibratedEvent uncalibrated_gyro;
AUncalibratedEvent uncalibrated_magnetic;
AMetaDataEvent meta_data;
AHeartRateEvent heart_rate;
ADynamicSensorEvent dynamic_sensor_meta;
AAdditionalInfoEvent additional_info;
};
union {
uint64_t data[8];
uint64_t step_counter;
} u64;
};
uint32_t flags;
int32_t reserved1[3];
} ASensorEvent;
struct ASensorManager;
/**
* {@link ASensorManager} is an opaque type to manage sensors and
* events queues.
*
* {@link ASensorManager} is a singleton that can be obtained using
* ASensorManager_getInstance().
*
* This file provides a set of functions that uses {@link
* ASensorManager} to access and list hardware sensors, and
* create and destroy event queues:
* - ASensorManager_getSensorList()
* - ASensorManager_getDefaultSensor()
* - ASensorManager_getDefaultSensorEx()
* - ASensorManager_createEventQueue()
* - ASensorManager_destroyEventQueue()
*/
typedef struct ASensorManager ASensorManager;
struct ASensorEventQueue;
/**
* {@link ASensorEventQueue} is an opaque type that provides access to
* {@link ASensorEvent} from hardware sensors.
*
* A new {@link ASensorEventQueue} can be obtained using ASensorManager_createEventQueue().
*
* This file provides a set of functions to enable and disable
* sensors, check and get events, and set event rates on a {@link
* ASensorEventQueue}.
* - ASensorEventQueue_enableSensor()
* - ASensorEventQueue_disableSensor()
* - ASensorEventQueue_hasEvents()
* - ASensorEventQueue_getEvents()
* - ASensorEventQueue_setEventRate()
*/
typedef struct ASensorEventQueue ASensorEventQueue;
struct ASensor;
/**
* {@link ASensor} is an opaque type that provides information about
* an hardware sensors.
*
* A {@link ASensor} pointer can be obtained using
* ASensorManager_getDefaultSensor(),
* ASensorManager_getDefaultSensorEx() or from a {@link ASensorList}.
*
* This file provides a set of functions to access properties of a
* {@link ASensor}:
* - ASensor_getName()
* - ASensor_getVendor()
* - ASensor_getType()
* - ASensor_getResolution()
* - ASensor_getMinDelay()
* - ASensor_getFifoMaxEventCount()
* - ASensor_getFifoReservedEventCount()
* - ASensor_getStringType()
* - ASensor_getReportingMode()
* - ASensor_isWakeUpSensor()
*/
typedef struct ASensor ASensor;
/**
* {@link ASensorRef} is a type for constant pointers to {@link ASensor}.
*
* This is used to define entry in {@link ASensorList} arrays.
*/
typedef ASensor const* ASensorRef;
/**
* {@link ASensorList} is an array of reference to {@link ASensor}.
*
* A {@link ASensorList} can be initialized using ASensorManager_getSensorList().
*/
typedef ASensorRef const* ASensorList;
/*****************************************************************************/
/**
* Get a reference to the sensor manager. ASensorManager is a singleton
* per package as different packages may have access to different sensors.
*
* Deprecated: Use ASensorManager_getInstanceForPackage(const char*) instead.
*
* Example:
*
* ASensorManager* sensorManager = ASensorManager_getInstance();
*
*/
__attribute__ ((deprecated)) ASensorManager* ASensorManager_getInstance();
/*
* Get a reference to the sensor manager. ASensorManager is a singleton
* per package as different packages may have access to different sensors.
*
* Example:
*
* ASensorManager* sensorManager = ASensorManager_getInstanceForPackage("foo.bar.baz");
*
*/
ASensorManager* ASensorManager_getInstanceForPackage(const char* packageName);
/**
* Returns the list of available sensors.
*/
int ASensorManager_getSensorList(ASensorManager* manager, ASensorList* list);
/**
* Returns the default sensor for the given type, or NULL if no sensor
* of that type exists.
*/
ASensor const* ASensorManager_getDefaultSensor(ASensorManager* manager, int type);
#if __ANDROID_API__ >= 21
/**
* Returns the default sensor with the given type and wakeUp properties or NULL if no sensor
* of this type and wakeUp properties exists.
*/
ASensor const* ASensorManager_getDefaultSensorEx(ASensorManager* manager, int type,
bool wakeUp);
#endif
/**
* Creates a new sensor event queue and associate it with a looper.
*
* "ident" is a identifier for the events that will be returned when
* calling ALooper_pollOnce(). The identifier must be >= 0, or
* ALOOPER_POLL_CALLBACK if providing a non-NULL callback.
*/
ASensorEventQueue* ASensorManager_createEventQueue(ASensorManager* manager,
ALooper* looper, int ident, ALooper_callbackFunc callback, void* data);
/**
* Destroys the event queue and free all resources associated to it.
*/
int ASensorManager_destroyEventQueue(ASensorManager* manager, ASensorEventQueue* queue);
/*****************************************************************************/
/**
* Enable the selected sensor with a specified sampling period and max batch report latency.
* Returns a negative error code on failure.
*/
int ASensorEventQueue_registerSensor(ASensorEventQueue* queue, ASensor const* sensor,
int32_t samplingPeriodUs, int maxBatchReportLatencyUs);
/**
* Enable the selected sensor. Returns a negative error code on failure.
*/
int ASensorEventQueue_enableSensor(ASensorEventQueue* queue, ASensor const* sensor);
/**
* Disable the selected sensor. Returns a negative error code on failure.
*/
int ASensorEventQueue_disableSensor(ASensorEventQueue* queue, ASensor const* sensor);
/**
* Sets the delivery rate of events in microseconds for the given sensor.
* Note that this is a hint only, generally event will arrive at a higher
* rate. It is an error to set a rate inferior to the value returned by
* ASensor_getMinDelay().
* Returns a negative error code on failure.
*/
int ASensorEventQueue_setEventRate(ASensorEventQueue* queue, ASensor const* sensor, int32_t usec);
/**
* Returns true if there are one or more events available in the
* sensor queue. Returns 1 if the queue has events; 0 if
* it does not have events; and a negative value if there is an error.
*/
int ASensorEventQueue_hasEvents(ASensorEventQueue* queue);
/**
* Returns the next available events from the queue. Returns a negative
* value if no events are available or an error has occurred, otherwise
* the number of events returned.
*
* Examples:
* ASensorEvent event;
* ssize_t numEvent = ASensorEventQueue_getEvents(queue, &event, 1);
*
* ASensorEvent eventBuffer[8];
* ssize_t numEvent = ASensorEventQueue_getEvents(queue, eventBuffer, 8);
*
*/
ssize_t ASensorEventQueue_getEvents(ASensorEventQueue* queue,
ASensorEvent* events, size_t count);
/*****************************************************************************/
/**
* Returns this sensor's name (non localized)
*/
const char* ASensor_getName(ASensor const* sensor);
/**
* Returns this sensor's vendor's name (non localized)
*/
const char* ASensor_getVendor(ASensor const* sensor);
/**
* Return this sensor's type
*/
int ASensor_getType(ASensor const* sensor);
/**
* Returns this sensors's resolution
*/
float ASensor_getResolution(ASensor const* sensor);
/**
* Returns the minimum delay allowed between events in microseconds.
* A value of zero means that this sensor doesn't report events at a
* constant rate, but rather only when a new data is available.
*/
int ASensor_getMinDelay(ASensor const* sensor);
#if __ANDROID_API__ >= 21
/**
* Returns the maximum size of batches for this sensor. Batches will often be
* smaller, as the hardware fifo might be used for other sensors.
*/
int ASensor_getFifoMaxEventCount(ASensor const* sensor);
/**
* Returns the hardware batch fifo size reserved to this sensor.
*/
int ASensor_getFifoReservedEventCount(ASensor const* sensor);
/**
* Returns this sensor's string type.
*/
const char* ASensor_getStringType(ASensor const* sensor);
/**
* Returns the reporting mode for this sensor. One of AREPORTING_MODE_* constants.
*/
int ASensor_getReportingMode(ASensor const* sensor);
/**
* Returns true if this is a wake up sensor, false otherwise.
*/
bool ASensor_isWakeUpSensor(ASensor const* sensor);
#endif /* __ANDROID_API__ >= 21 */
#ifdef __cplusplus
};
#endif
#endif // ANDROID_SENSOR_H
/** @} */