harmony 鸿蒙Pan-Sensor

2022-08-09
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Pan-Sensor

Introduction

The pan-sensor service subsystem provides a lightweight sensor service framework, through which you can perform the following operations:

Query the sensor list.
Enable or disable a sensor.
Subscribe to or unsubscribe from sensor data.
Set the data reporting mode of a sensor.

The following figure shows the architecture of the pan-sensor service framework.

Directory Structure

/base/sensors
├── sensor_lite          # Sensor directory
│   ├── frameworks       # Framework code
│   ├── interfaces       # Native APIs
│   └── services         # Code of services
└── miscdevice_lite      # Misc device directory

Usage

The following modules work cooperatively to implement pan-sensor capabilities: Sensor API, Sensor Framework, and Sensor Service.

Sensor API: provides APIs for performing basic operations on sensors, including querying the sensor list, enabling or disabling sensors, and subscribing to or unsubscribing from sensor data.
Sensor Framework: manages sensor data subscription, creates and destroys data channels, subscribes to or unsubscribes from sensor data, and implements communication with the Sensor Service module.
Sensor Service: interacts with the HDF module to receive, parse, and distribute data, manages sensor services and sensor data reporting, and controls sensor permissions.