/* * 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. */ #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 #include #ifdef __cplusplus extern "C" { #endif /* * Sensor types * (keep in sync with hardware/sensor.h) */ enum { ASENSOR_TYPE_ACCELEROMETER = 1, ASENSOR_TYPE_MAGNETIC_FIELD = 2, ASENSOR_TYPE_GYROSCOPE = 4, ASENSOR_TYPE_LIGHT = 5, ASENSOR_TYPE_PROXIMITY = 8 }; /* * Sensor accuracy measure */ enum { ASENSOR_STATUS_UNRELIABLE = 0, ASENSOR_STATUS_ACCURACY_LOW = 1, ASENSOR_STATUS_ACCURACY_MEDIUM = 2, ASENSOR_STATUS_ACCURACY_HIGH = 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; /* 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; }; union { uint64_t data[8]; uint64_t step_counter; } u64; }; uint32_t flags; int32_t reserved1[3]; } ASensorEvent; struct ASensorManager; typedef struct ASensorManager ASensorManager; struct ASensorEventQueue; typedef struct ASensorEventQueue ASensorEventQueue; struct ASensor; typedef struct ASensor ASensor; typedef ASensor const* ASensorRef; typedef ASensorRef const* ASensorList; /*****************************************************************************/ /* * Get a reference to the sensor manager. ASensorManager is a singleton. * * Example: * * ASensorManager* sensorManager = ASensorManager_getInstance(); * */ ASensorManager* ASensorManager_getInstance(); /* * 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 exist. */ ASensor const* ASensorManager_getDefaultSensor(ASensorManager* manager, int type); /* * Creates a new sensor event queue and associate it with a looper. */ 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. 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); /* * 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 permission required to see or access this sensor, or the * empty string if none is required. */ const char* ASensor_getRequiredPermission(ASensor const* sensor); #ifdef __cplusplus }; #endif #endif // ANDROID_SENSOR_H