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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.
*/
/**
* Structures and functions to receive and process sensor events in
* native code.
*
* @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
*/
#include <android/looper.h>
#include <stdbool.h>
#include <sys/types.h>
#include <math.h>
#include <stdint.h>
#if !defined(__INTRODUCED_IN)
#define __INTRODUCED_IN(__api_level) /* nothing */
#endif
#if !defined(__DEPRECATED_IN)
#define __DEPRECATED_IN(__api_level) __attribute__((__deprecated__))
#endif
#ifdef __cplusplus
extern "C" {
#endif
typedef struct AHardwareBuffer AHardwareBuffer;
#define ASENSOR_RESOLUTION_INVALID (nanf(""))
#define ASENSOR_FIFO_COUNT_INVALID (-1)
#define ASENSOR_DELAY_INVALID INT32_MIN
#define ASENSOR_INVALID (-1)
/* (Keep in sync with hardware/sensors-base.h and Sensor.java.) */
/**
* Sensor types.
*
* See
* [android.hardware.SensorEvent#values](https://developer.android.com/reference/android/hardware/SensorEvent.html#values)
* for detailed explanations of the data returned for each of these types.
*/
enum {
/**
* Invalid sensor type. Returned by {@link ASensor_getType} as error value.
*/
ASENSOR_TYPE_INVALID = -1,
/**
* {@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_PRESSURE}
*
* The pressure sensor value is returned in hPa (millibar).
*/
ASENSOR_TYPE_PRESSURE = 6,
/**
* {@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_GRAVITY}
*
* All values are in SI units (m/s^2) and measure the direction and
* magnitude of gravity. When the device is at rest, the output of
* the gravity sensor should be identical to that of the accelerometer.
*/
ASENSOR_TYPE_GRAVITY = 9,
/**
* {@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,
/**
* {@link ASENSOR_TYPE_ROTATION_VECTOR}
*/
ASENSOR_TYPE_ROTATION_VECTOR = 11,
/**
* {@link ASENSOR_TYPE_RELATIVE_HUMIDITY}
*
* The relative humidity sensor value is returned in percent.
*/
ASENSOR_TYPE_RELATIVE_HUMIDITY = 12,
/**
* {@link ASENSOR_TYPE_AMBIENT_TEMPERATURE}
*
* The ambient temperature sensor value is returned in Celcius.
*/
ASENSOR_TYPE_AMBIENT_TEMPERATURE = 13,
/**
* {@link ASENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED}
*/
ASENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED = 14,
/**
* {@link ASENSOR_TYPE_GAME_ROTATION_VECTOR}
*/
ASENSOR_TYPE_GAME_ROTATION_VECTOR = 15,
/**
* {@link ASENSOR_TYPE_GYROSCOPE_UNCALIBRATED}
*/
ASENSOR_TYPE_GYROSCOPE_UNCALIBRATED = 16,
/**
* {@link ASENSOR_TYPE_SIGNIFICANT_MOTION}
*/
ASENSOR_TYPE_SIGNIFICANT_MOTION = 17,
/**
* {@link ASENSOR_TYPE_STEP_DETECTOR}
*/
ASENSOR_TYPE_STEP_DETECTOR = 18,
/**
* {@link ASENSOR_TYPE_STEP_COUNTER}
*/
ASENSOR_TYPE_STEP_COUNTER = 19,
/**
* {@link ASENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR}
*/
ASENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR = 20,
/**
* {@link ASENSOR_TYPE_HEART_RATE}
*/
ASENSOR_TYPE_HEART_RATE = 21,
/**
* {@link ASENSOR_TYPE_POSE_6DOF}
*/
ASENSOR_TYPE_POSE_6DOF = 28,
/**
* {@link ASENSOR_TYPE_STATIONARY_DETECT}
*/
ASENSOR_TYPE_STATIONARY_DETECT = 29,
/**
* {@link ASENSOR_TYPE_MOTION_DETECT}
*/
ASENSOR_TYPE_MOTION_DETECT = 30,
/**
* {@link ASENSOR_TYPE_HEART_BEAT}
*/
ASENSOR_TYPE_HEART_BEAT = 31,
/**
* This sensor type is for delivering additional sensor information aside
* from sensor event data.
*
* Additional information may include:
* - {@link ASENSOR_ADDITIONAL_INFO_INTERNAL_TEMPERATURE}
* - {@link ASENSOR_ADDITIONAL_INFO_SAMPLING}
* - {@link ASENSOR_ADDITIONAL_INFO_SENSOR_PLACEMENT}
* - {@link ASENSOR_ADDITIONAL_INFO_UNTRACKED_DELAY}
* - {@link ASENSOR_ADDITIONAL_INFO_VEC3_CALIBRATION}
*
* This type will never bind to a sensor. In other words, no sensor in the
* sensor list can have the type {@link ASENSOR_TYPE_ADDITIONAL_INFO}.
*
* If a device supports the sensor additional information feature, it will
* report additional information events via {@link ASensorEvent} and will
* have the type of {@link ASensorEvent} set to
* {@link ASENSOR_TYPE_ADDITIONAL_INFO} and the sensor of {@link ASensorEvent} set
* to the handle of the reporting sensor.
*
* Additional information reports consist of multiple frames ordered by
* {@link ASensorEvent#timestamp}. The first frame in the report will have
* a {@link AAdditionalInfoEvent#type} of
* {@link ASENSOR_ADDITIONAL_INFO_BEGIN}, and the last frame in the report
* will have a {@link AAdditionalInfoEvent#type} of
* {@link ASENSOR_ADDITIONAL_INFO_END}.
*
*/
ASENSOR_TYPE_ADDITIONAL_INFO = 33,
/**
* {@link ASENSOR_TYPE_LOW_LATENCY_OFFBODY_DETECT}
*/
ASENSOR_TYPE_LOW_LATENCY_OFFBODY_DETECT = 34,
/**
* {@link ASENSOR_TYPE_ACCELEROMETER_UNCALIBRATED}
*/
ASENSOR_TYPE_ACCELEROMETER_UNCALIBRATED = 35,
/**
* {@link ASENSOR_TYPE_HINGE_ANGLE}
* reporting-mode: on-change
*
* The hinge angle sensor value is returned in degrees.
*/
ASENSOR_TYPE_HINGE_ANGLE = 36,
};
/**
* 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 {
/** invalid reporting mode */
AREPORTING_MODE_INVALID = -1,
/** 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
};
/**
* Sensor Direct Report Rates.
*/
enum {
/** stopped */
ASENSOR_DIRECT_RATE_STOP = 0,
/** nominal 50Hz */
ASENSOR_DIRECT_RATE_NORMAL = 1,
/** nominal 200Hz */
ASENSOR_DIRECT_RATE_FAST = 2,
/** nominal 800Hz */
ASENSOR_DIRECT_RATE_VERY_FAST = 3
};
/**
* Sensor Direct Channel Type.
*/
enum {
/** shared memory created by ASharedMemory_create */
ASENSOR_DIRECT_CHANNEL_TYPE_SHARED_MEMORY = 1,
/** AHardwareBuffer */
ASENSOR_DIRECT_CHANNEL_TYPE_HARDWARE_BUFFER = 2
};
/**
* Sensor Additional Info Types.
*
* Used to populate {@link AAdditionalInfoEvent#type}.
*/
enum {
/** Marks the beginning of additional information frames */
ASENSOR_ADDITIONAL_INFO_BEGIN = 0,
/** Marks the end of additional information frames */
ASENSOR_ADDITIONAL_INFO_END = 1,
/**
* Estimation of the delay that is not tracked by sensor timestamps. This
* includes delay introduced by sensor front-end filtering, data transport,
* etc.
* float[2]: delay in seconds, standard deviation of estimated value
*/
ASENSOR_ADDITIONAL_INFO_UNTRACKED_DELAY = 0x10000,
/** float: Celsius temperature */
ASENSOR_ADDITIONAL_INFO_INTERNAL_TEMPERATURE,
/**
* First three rows of a homogeneous matrix, which represents calibration to
* a three-element vector raw sensor reading.
* float[12]: 3x4 matrix in row major order
*/
ASENSOR_ADDITIONAL_INFO_VEC3_CALIBRATION,
/**
* Location and orientation of sensor element in the device frame: origin is
* the geometric center of the mobile device screen surface; the axis
* definition corresponds to Android sensor definitions.
* float[12]: 3x4 matrix in row major order
*/
ASENSOR_ADDITIONAL_INFO_SENSOR_PLACEMENT,
/**
* float[2]: raw sample period in seconds,
* standard deviation of sampling period
*/
ASENSOR_ADDITIONAL_INFO_SAMPLING,
};
/*
* 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: changes to these structs have to be backward compatible */
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 AAdditionalInfoEvent {
/**
* Event type, such as ASENSOR_ADDITIONAL_INFO_BEGIN, ASENSOR_ADDITIONAL_INFO_END and others.
* Refer to {@link ASENSOR_TYPE_ADDITIONAL_INFO} for the expected reporting behavior.
*/
int32_t type;
int32_t serial;
union {
int32_t data_int32[14];
float data_float[14];
};
} AAdditionalInfoEvent;
/**
* Information that describes a sensor event, refer to
* <a href="/reference/android/hardware/SensorEvent">SensorEvent</a> for additional
* documentation.
*/
/* NOTE: changes to this struct has to be backward compatible */
typedef struct ASensorEvent {
int32_t version; /* sizeof(struct ASensorEvent) */
int32_t sensor; /** The sensor that generates this event */
int32_t type; /** Sensor type for the event, such as {@link ASENSOR_TYPE_ACCELEROMETER} */
int32_t reserved0; /** do not use */
/**
* The time in nanoseconds at which the event happened, and its behavior
* is identical to <a href="/reference/android/hardware/SensorEvent#timestamp">
* SensorEvent::timestamp</a> in Java API.
*/
int64_t timestamp;
union {
union {
float data[16];
ASensorVector vector;
ASensorVector acceleration;
ASensorVector gyro;
ASensorVector magnetic;
float temperature;
float distance;
float light;
float pressure;
float relative_humidity;
AUncalibratedEvent uncalibrated_acceleration;
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()
* - ASensorEventQueue_requestAdditionalInfoEvents()
*/
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()
* - ASensor_getHandle()
*/
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();
*
*/
ASensorManager* ASensorManager_getInstance() __DEPRECATED_IN(26);
/**
* 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");
*
* Available since API level 26.
*/
ASensorManager* ASensorManager_getInstanceForPackage(const char* packageName) __INTRODUCED_IN(26);
/**
* 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);
/**
* Returns the default sensor with the given type and wakeUp properties or NULL if no sensor
* of this type and wakeUp properties exists.
*
* Available since API level 21.
*/
ASensor const* ASensorManager_getDefaultSensorEx(ASensorManager* manager, int type, bool wakeUp) __INTRODUCED_IN(21);
/**
* 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);
/**
* Create direct channel based on shared memory
*
* Create a direct channel of {@link ASENSOR_DIRECT_CHANNEL_TYPE_SHARED_MEMORY} to be used
* for configuring sensor direct report.
*
* Available since API level 26.
*
* \param manager the {@link ASensorManager} instance obtained from
* {@link ASensorManager_getInstanceForPackage}.
* \param fd file descriptor representing a shared memory created by
* {@link ASharedMemory_create}
* \param size size to be used, must be less or equal to size of shared memory.
*
* \return a positive integer as a channel id to be used in
* {@link ASensorManager_destroyDirectChannel} and
* {@link ASensorManager_configureDirectReport}, or value less or equal to 0 for failures.
*/
int ASensorManager_createSharedMemoryDirectChannel(ASensorManager* manager, int fd, size_t size) __INTRODUCED_IN(26);
/**
* Create direct channel based on AHardwareBuffer
*
* Create a direct channel of {@link ASENSOR_DIRECT_CHANNEL_TYPE_HARDWARE_BUFFER} type to be used
* for configuring sensor direct report.
*
* Available since API level 26.
*
* \param manager the {@link ASensorManager} instance obtained from
* {@link ASensorManager_getInstanceForPackage}.
* \param buffer {@link AHardwareBuffer} instance created by {@link AHardwareBuffer_allocate}.
* \param size the intended size to be used, must be less or equal to size of buffer.
*
* \return a positive integer as a channel id to be used in
* {@link ASensorManager_destroyDirectChannel} and
* {@link ASensorManager_configureDirectReport}, or value less or equal to 0 for failures.
*/
int ASensorManager_createHardwareBufferDirectChannel(
ASensorManager* manager, AHardwareBuffer const * buffer, size_t size) __INTRODUCED_IN(26);
/**
* Destroy a direct channel
*
* Destroy a direct channel previously created by using one of
* ASensorManager_create*DirectChannel() derivative functions.
* Note that the buffer used for creating the direct channel does not get destroyed with
* ASensorManager_destroyDirectChannel and has to be closed or released separately.
*
* Available since API level 26.
*
* \param manager the {@link ASensorManager} instance obtained from
* {@link ASensorManager_getInstanceForPackage}.
* \param channelId channel id (a positive integer) returned from
* {@link ASensorManager_createSharedMemoryDirectChannel} or
* {@link ASensorManager_createHardwareBufferDirectChannel}.
*/
void ASensorManager_destroyDirectChannel(ASensorManager* manager, int channelId) __INTRODUCED_IN(26);
/**
* Configure direct report on channel
*
* Configure sensor direct report on a direct channel: set rate to value other than
* {@link ASENSOR_DIRECT_RATE_STOP} so that sensor event can be directly
* written into the shared memory region used for creating the buffer. It returns a positive token
* which can be used for identify sensor events from different sensors on success. Calling with rate
* {@link ASENSOR_DIRECT_RATE_STOP} will stop direct report of the sensor specified in the channel.
*
* To stop all active sensor direct report configured to a channel, set sensor to NULL and rate to
* {@link ASENSOR_DIRECT_RATE_STOP}.
*
* In order to successfully configure a direct report, the sensor has to support the specified rate
* and the channel type, which can be checked by {@link ASensor_getHighestDirectReportRateLevel} and
* {@link ASensor_isDirectChannelTypeSupported}, respectively.
*
* Example:
*
* ASensorManager *manager = ...;
* ASensor *sensor = ...;
* int channelId = ...;
*
* ASensorManager_configureDirectReport(manager, sensor, channel_id, ASENSOR_DIRECT_RATE_FAST);
*
* Available since API level 26.
*
* \param manager the {@link ASensorManager} instance obtained from
* {@link ASensorManager_getInstanceForPackage}.
* \param sensor a {@link ASensor} to denote which sensor to be operate. It can be NULL if rate
* is {@link ASENSOR_DIRECT_RATE_STOP}, denoting stopping of all active sensor
* direct report.
* \param channelId channel id (a positive integer) returned from
* {@link ASensorManager_createSharedMemoryDirectChannel} or
* {@link ASensorManager_createHardwareBufferDirectChannel}.
* \param rate one of predefined ASENSOR_DIRECT_RATE_... that is supported by the sensor.
* \return positive token for success or negative error code.
*/
int ASensorManager_configureDirectReport(ASensorManager* manager,
ASensor const* sensor, int channelId, int rate) __INTRODUCED_IN(26);
/*****************************************************************************/
/**
* Enable the selected sensor with sampling and report parameters
*
* Enable the selected sensor at a specified sampling period and max batch report latency.
* To disable sensor, use {@link ASensorEventQueue_disableSensor}.
*
* \param queue {@link ASensorEventQueue} for sensor event to be report to.
* \param sensor {@link ASensor} to be enabled.
* \param samplingPeriodUs sampling period of sensor in microseconds.
* \param maxBatchReportLatencyUs maximum time interval between two batches of sensor events are
* delievered in microseconds. For sensor streaming, set to 0.
* \return 0 on success or a negative error code on failure.
*/
int ASensorEventQueue_registerSensor(ASensorEventQueue* queue, ASensor const* sensor,
int32_t samplingPeriodUs, int64_t maxBatchReportLatencyUs);
/**
* Enable the selected sensor at default sampling rate.
*
* Start event reports of a sensor to specified sensor event queue at a default rate.
*
* \param queue {@link ASensorEventQueue} for sensor event to be report to.
* \param sensor {@link ASensor} to be enabled.
*
* \return 0 on success or a negative error code on failure.
*/
int ASensorEventQueue_enableSensor(ASensorEventQueue* queue, ASensor const* sensor);
/**
* Disable the selected sensor.
*
* Stop event reports from the sensor to specified sensor event queue.
*
* \param queue {@link ASensorEventQueue} to be changed
* \param sensor {@link ASensor} to be disabled
* \return 0 on success or 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.
*
* This function has to be called after {@link ASensorEventQueue_enableSensor}.
* 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().
*
* \param queue {@link ASensorEventQueue} to which sensor event is delivered.
* \param sensor {@link ASensor} of which sampling rate to be updated.
* \param usec sensor sampling period (1/sampling rate) in microseconds
* \return 0 on sucess or a negative error code on failure.
*/
int ASensorEventQueue_setEventRate(ASensorEventQueue* queue, ASensor const* sensor, int32_t usec);
/**
* Determine if a sensor event queue has pending event to be processed.
*
* \param queue {@link ASensorEventQueue} to be queried
* \return 1 if the queue has events; 0 if it does not have events;
* or a negative value if there is an error.
*/
int ASensorEventQueue_hasEvents(ASensorEventQueue* queue);
/**
* Retrieve pending events in sensor event queue
*
* Retrieve next available events from the queue to a specified event array.
*
* \param queue {@link ASensorEventQueue} to get events from
* \param events pointer to an array of {@link ASensorEvent}.
* \param count max number of event that can be filled into array event.
* \return number of events returned on success; negative error code when
* no events are pending or an error has occurred.
*
* 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);
/**
* Request that {@link ASENSOR_TYPE_ADDITIONAL_INFO} events to be delivered on
* the given {@link ASensorEventQueue}.
*
* Sensor data events are always delivered to the {@link ASensorEventQueue}.
*
* The {@link ASENSOR_TYPE_ADDITIONAL_INFO} events will be returned through
* {@link ASensorEventQueue_getEvents}. The client is responsible for checking
* {@link ASensorEvent#type} to determine the event type prior to handling of
* the event.
*
* The client must be tolerant of any value for
* {@link AAdditionalInfoEvent#type}, as new values may be defined in the future
* and may delivered to the client.
*
* Available since API level 29.
*
* \param queue {@link ASensorEventQueue} to configure
* \param enable true to request {@link ASENSOR_TYPE_ADDITIONAL_INFO} events,
* false to stop receiving events
* \return 0 on success or a negative error code on failure
*/
int ASensorEventQueue_requestAdditionalInfoEvents(ASensorEventQueue* queue, bool enable) __INTRODUCED_IN(29);
/*****************************************************************************/
/**
* 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);
/**
* Returns the maximum size of batches for this sensor. Batches will often be
* smaller, as the hardware fifo might be used for other sensors.
*
* Available since API level 21.
*/
int ASensor_getFifoMaxEventCount(ASensor const* sensor) __INTRODUCED_IN(21);
/**
* Returns the hardware batch fifo size reserved to this sensor.
*
* Available since API level 21.
*/
int ASensor_getFifoReservedEventCount(ASensor const* sensor) __INTRODUCED_IN(21);
/**
* Returns this sensor's string type.
*
* Available since API level 21.
*/
const char* ASensor_getStringType(ASensor const* sensor) __INTRODUCED_IN(21);
/**
* Returns the reporting mode for this sensor. One of AREPORTING_MODE_* constants.
*
* Available since API level 21.
*/
int ASensor_getReportingMode(ASensor const* sensor) __INTRODUCED_IN(21);
/**
* Returns true if this is a wake up sensor, false otherwise.
*
* Available since API level 21.
*/
bool ASensor_isWakeUpSensor(ASensor const* sensor) __INTRODUCED_IN(21);
/**
* Test if sensor supports a certain type of direct channel.
*
* Available since API level 26.
*
* \param sensor a {@link ASensor} to denote the sensor to be checked.
* \param channelType Channel type constant, either
* {@link ASENSOR_DIRECT_CHANNEL_TYPE_SHARED_MEMORY}
* or {@link ASENSOR_DIRECT_CHANNEL_TYPE_HARDWARE_BUFFER}.
* \returns true if sensor supports the specified direct channel type.
*/
bool ASensor_isDirectChannelTypeSupported(ASensor const* sensor, int channelType) __INTRODUCED_IN(26);
/**
* Get the highest direct rate level that a sensor supports.
*
* Available since API level 26.
*
* \param sensor a {@link ASensor} to denote the sensor to be checked.
*
* \return a ASENSOR_DIRECT_RATE_... enum denoting the highest rate level supported by the sensor.
* If return value is {@link ASENSOR_DIRECT_RATE_STOP}, it means the sensor
* does not support direct report.
*/
int ASensor_getHighestDirectReportRateLevel(ASensor const* sensor) __INTRODUCED_IN(26);
/**
* Returns the sensor's handle.
*
* The handle identifies the sensor within the system and is included in the
* sensor field of {@link ASensorEvent}, including those sent with type
* {@link ASENSOR_TYPE_ADDITIONAL_INFO}.
*
* A sensor's handle is able to be used to map {@link ASENSOR_TYPE_ADDITIONAL_INFO} events to the
* sensor that generated the event.
*
* It is important to note that the value returned by {@link ASensor_getHandle} is not the same as
* the value returned by the Java API <a href="/reference/android/hardware/Sensor#getId()">
* android.hardware.Sensor's getId()</a> and no mapping exists between the values.
*
* Available since API level 29.
*/
int ASensor_getHandle(ASensor const* sensor) __INTRODUCED_IN(29);
#ifdef __cplusplus
};
#endif
#endif // ANDROID_SENSOR_H
/** @} */
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