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en/OpenHarmony-Overview.md
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# OpenHarmony<a name="EN-US_TOPIC_0000001158661243"></a>
# OpenHarmony Project
## Introduction<a name="section1270210396435"></a>
......@@ -10,14 +10,14 @@ OpenHarmony is designed with a layered architecture, which from bottom to top, c
![](figures/1.png)
**Kernel Layer**
**Kernel layer**
- Kernel subsystem: OpenHarmony uses a multi-kernel design \(Linux or LiteOS\) so that different kernels can be selected for devices with different resource limitations. The kernel abstraction layer \(KAL\) hides differences in kernel implementations and provides the upper layer with basic kernel capabilities, including process and thread management, memory management, file system, network management, and peripheral management.
- Driver subsystem: Hardware Driver Foundation \(HDF\) lays the foundation for an open OpenHarmony hardware ecosystem. It allows for unified access from peripheral devices and provides foundation for driver development and management.
**System Service Layer**
**System service layer**
The system service layer provides a complete set of capabilities essential for OpenHarmony to offer services for apps through the framework layer. This layer consists of the following parts:
......@@ -109,225 +109,39 @@ You need to understand the following basic concepts related to OpenHarmony:
A module is a reusable software binary unit that contains source code, configuration files, resource files, and build scripts. A module can be built independently, integrated in binary mode, and then tested independently.
The following table describes the subsystems of OpenHarmony. For details about the readme files of these subsystems, see [https://gitee.com/openharmony/docs/tree/master/en/readme](https://gitee.com/openharmony/docs/tree/master/en/readme).
<a name="table18981149155318"></a>
<table><thead align="left"><tr id="row69811925313"><th class="cellrowborder" valign="top" width="11.111111111111112%" id="mcps1.1.4.1.1"><p id="p9143172718537"><a name="p9143172718537"></a><a name="p9143172718537"></a>Subsystem</p>
</th>
<th class="cellrowborder" valign="top" width="80.80808080808082%" id="mcps1.1.4.1.2"><p id="p6143122775319"><a name="p6143122775319"></a><a name="p6143122775319"></a>Description</p>
</th>
<th class="cellrowborder" valign="top" width="8.080808080808081%" id="mcps1.1.4.1.3"><p id="p36827655311"><a name="p36827655311"></a><a name="p36827655311"></a>Applicable To</p>
</th>
</tr>
</thead>
<tbody><tr id="row1746235812115"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p84622581117"><a name="p84622581117"></a><a name="p84622581117"></a>Kernel</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p34626584118"><a name="p34626584118"></a><a name="p34626584118"></a>Supports small-sized LiteOS kernels that provide high performance and low power consumption for embedded devices and devices with limited resources, and supports Linux kernels that are applicable to the standard system.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p31041221121"><a name="p31041221121"></a><a name="p31041221121"></a>Small system</p>
<p id="p16450192619121"><a name="p16450192619121"></a><a name="p16450192619121"></a>Standard system</p>
</td>
</tr>
<tr id="row4465751131114"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p12465145131117"><a name="p12465145131117"></a><a name="p12465145131117"></a>DFileSystem</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p1046615111118"><a name="p1046615111118"></a><a name="p1046615111118"></a>Provides APIs for synchronizing local JS files.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p15466135171117"><a name="p15466135171117"></a><a name="p15466135171117"></a>Standard system</p>
</td>
</tr>
<tr id="row14286184818110"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p1328654871112"><a name="p1328654871112"></a><a name="p1328654871112"></a>Graphics</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p15912684317"><a name="p15912684317"></a><a name="p15912684317"></a>Consists of user interface (UI) components, layout, animator, font, input event, window management, and rendering and drawing modules. It is an application framework that can be built on the LiteOS to develop OpenHarmony applications for Internet of Things (IoT) devices with limited hardware resources or on the standard OS to develop OpenHarmony applications for standard- and large-system devices (for example, tablet and lite smart devices).</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p228719483115"><a name="p228719483115"></a><a name="p228719483115"></a>All systems</p>
</td>
</tr>
<tr id="row4981119185313"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p43071335181312"><a name="p43071335181312"></a><a name="p43071335181312"></a>Driver</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p849919919515"><a name="p849919919515"></a><a name="p849919919515"></a>Constructed using the C object-oriented programming (OOP) language. It provides a unified driver platform and is compatible with different kernels by means of platform decoupling and kernel decoupling. This unified driver platform is designed to provide a more precise and efficient development environment, where you develop a driver that can be deployed on different systems supporting Hardware Driver Foundation (HDF).</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p7909102101420"><a name="p7909102101420"></a><a name="p7909102101420"></a>All systems</p>
</td>
</tr>
<tr id="row1698219916532"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p183071635131320"><a name="p183071635131320"></a><a name="p183071635131320"></a>Power Management</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p1534121801513"><a name="p1534121801513"></a><a name="p1534121801513"></a>Provides the following functions: restarting the system, managing running locks, managing and querying the system power status, querying and reporting the charging and battery status, and turning on/off the device screen, including adjusting the screen brightness.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p0562145615152"><a name="p0562145615152"></a><a name="p0562145615152"></a>Standard system</p>
</td>
</tr>
<tr id="row1998212985315"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p1230718353132"><a name="p1230718353132"></a><a name="p1230718353132"></a>Pan-sensor</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p114999919515"><a name="p114999919515"></a><a name="p114999919515"></a>Contains sensors and misc devices. A sensor is a device to detect events or changes in an environment and send messages about the events or changes to another electronic device. Misc devices, including vibrators and LED lights, are used to send signals externally. You can call APIs to control the vibration of vibrators and lighting-on and lighting-off of LED lights.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p7683136135317"><a name="p7683136135317"></a><a name="p7683136135317"></a>Small system</p>
</td>
</tr>
<tr id="row1398249165320"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p1930743511318"><a name="p1930743511318"></a><a name="p1930743511318"></a>Multimodal Input</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p13832172015162"><a name="p13832172015162"></a><a name="p13832172015162"></a>OpenHarmony provides a Natural User Interface (NUI) for you to interact with your users. Unlike conventional categorization of input methods, OpenHarmony combines input methods of different dimensions into multimodal inputs, so you can easily arm your app with multi-dimensional, natural interaction features by using the application framework and system built-in UI components or APIs. Specifically, OpenHarmony currently supports traditional input methods such as key and touch inputs.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p025515141075"><a name="p025515141075"></a><a name="p025515141075"></a>Standard system</p>
</td>
</tr>
<tr id="row209823955313"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p1030711354137"><a name="p1030711354137"></a><a name="p1030711354137"></a>Startup</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p54461340151820"><a name="p54461340151820"></a><a name="p54461340151820"></a>Starts the OS middle layer between the time the kernel is started and the time apps are started. In addition, you can query and modify system attributes and restore factory settings.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p8683362533"><a name="p8683362533"></a><a name="p8683362533"></a>All systems</p>
</td>
</tr>
<tr id="row1982159115313"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p14307173571315"><a name="p14307173571315"></a><a name="p14307173571315"></a>Update</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p887484183"><a name="p887484183"></a><a name="p887484183"></a>Supports over the air (OTA) update of OpenHarmony devices.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p10550164995117"><a name="p10550164995117"></a><a name="p10550164995117"></a>Standard system</p>
</td>
</tr>
<tr id="row89839920531"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p123071435151319"><a name="p123071435151319"></a><a name="p123071435151319"></a>Account</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p2772313127"><a name="p2772313127"></a><a name="p2772313127"></a>Provides interconnection with vendors' cloud account apps on the device side, and query and update of the cloud account login status.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p19928023151913"><a name="p19928023151913"></a><a name="p19928023151913"></a>Standard system</p>
</td>
</tr>
<tr id="row1598389185315"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p11473102882017"><a name="p11473102882017"></a><a name="p11473102882017"></a>Compilation and Building</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p22956349202"><a name="p22956349202"></a><a name="p22956349202"></a>Provides a compilation and building framework based on Generate Ninja (GN) and Ninja.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p183114819179"><a name="p183114819179"></a><a name="p183114819179"></a>All systems</p>
</td>
</tr>
<tr id="row179834916539"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p1347382819202"><a name="p1347382819202"></a><a name="p1347382819202"></a>Testing</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p1850179125115"><a name="p1850179125115"></a><a name="p1850179125115"></a>The test-driven development mode is used during the development process. You can develop new cases or modify existing cases to test new or enhanced system features. The test helps you develop high-quality code in the development phase.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p15458348191719"><a name="p15458348191719"></a><a name="p15458348191719"></a>All systems</p>
</td>
</tr>
<tr id="row1698317918532"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p11473172817202"><a name="p11473172817202"></a><a name="p11473172817202"></a>Data Management</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p2030983518561"><a name="p2030983518561"></a><a name="p2030983518561"></a>Provides local data management and distributed data management:</p>
<a name="ul2727156145217"></a><a name="ul2727156145217"></a><ul id="ul2727156145217"><li>Local app data management for lightweight preference databases and relational databases</li><li>Distributed data service to provide apps with the capability to store data in the databases of different devices</li></ul>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p193679548203"><a name="p193679548203"></a><a name="p193679548203"></a>Standard system</p>
</td>
</tr>
<tr id="row198318945311"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p14473132812018"><a name="p14473132812018"></a><a name="p14473132812018"></a>Programming Language Runtime</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p17753537218"><a name="p17753537218"></a><a name="p17753537218"></a>Provides the compilation and execution environment for programs developed with JavaScript or C/C++, basic libraries that support the runtime, and the runtime-associated APIs, compilers, and auxiliary tools.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p14593146192111"><a name="p14593146192111"></a><a name="p14593146192111"></a>All systems</p>
</td>
</tr>
<tr id="row098416935318"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p64731628132015"><a name="p64731628132015"></a><a name="p64731628132015"></a>Distributed Scheduler</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p55320348170"><a name="p55320348170"></a><a name="p55320348170"></a>Starts, registers, queries, and manages system services.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p76835611530"><a name="p76835611530"></a><a name="p76835611530"></a>All systems</p>
</td>
</tr>
<tr id="row11522144014127"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p847382818209"><a name="p847382818209"></a><a name="p847382818209"></a>JS UI framework</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p18885204913282"><a name="p18885204913282"></a><a name="p18885204913282"></a>OpenHarmony UI development framework that supports web-development-like paradigm.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p18278134513216"><a name="p18278134513216"></a><a name="p18278134513216"></a>All systems</p>
</td>
</tr>
<tr id="row163116577176"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p9473192862015"><a name="p9473192862015"></a><a name="p9473192862015"></a>Multimedia</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p17895171152211"><a name="p17895171152211"></a><a name="p17895171152211"></a>Provides easy-to-use APIs for developing multimedia components such as audio, video, and camera, and enables apps to use multimedia resources of the system.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p7683126105314"><a name="p7683126105314"></a><a name="p7683126105314"></a>All systems</p>
</td>
</tr>
<tr id="row99841913538"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p34736280204"><a name="p34736280204"></a><a name="p34736280204"></a>Event Notification</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p1328485917223"><a name="p1328485917223"></a><a name="p1328485917223"></a>Provides the common event management capabilities that allow apps to subscribe to, unsubscribe from, publish, and receive common events (such as screen-on/off events and USB device attachment/detachment events).</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p19305121815138"><a name="p19305121815138"></a><a name="p19305121815138"></a>Standard system</p>
</td>
</tr>
<tr id="row199841792533"><td class="cellrowborder" align="left" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p6473102817205"><a name="p6473102817205"></a><a name="p6473102817205"></a>Misc Services</p>
</td>
<td class="cellrowborder" align="left" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p8502149175110"><a name="p8502149175110"></a><a name="p8502149175110"></a>Provides the function of setting the time.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p1962012112314"><a name="p1962012112314"></a><a name="p1962012112314"></a>Standard system</p>
</td>
</tr>
<tr id="row176674368222"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p3667203652214"><a name="p3667203652214"></a><a name="p3667203652214"></a>Bundle management</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p12923326230"><a name="p12923326230"></a><a name="p12923326230"></a>Provides bundle installation, uninstallation, update, and query capabilities.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p12667123619226"><a name="p12667123619226"></a><a name="p12667123619226"></a>All systems</p>
</td>
</tr>
<tr id="row65111417226"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p612981114248"><a name="p612981114248"></a><a name="p612981114248"></a>Telephony</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p19521141152212"><a name="p19521141152212"></a><a name="p19521141152212"></a>Provides basic communication capabilities of the cellular network, such as SIM cards, network search, cellular data, cellular calls, SMS, and MMS, as well as easy-to-use APIs for you to manage multiple types of calls and data network connections.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p124681352134"><a name="p124681352134"></a><a name="p124681352134"></a>Standard system</p>
</td>
</tr>
<tr id="row10194183317227"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p14129311172416"><a name="p14129311172416"></a><a name="p14129311172416"></a>Utils</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p21941533132218"><a name="p21941533132218"></a><a name="p21941533132218"></a>Stores basic OpenHarmony components, which can be used by OpenHarmony subsystems and upper-layer apps.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p1219413311229"><a name="p1219413311229"></a><a name="p1219413311229"></a>All systems</p>
</td>
</tr>
<tr id="row9664349242"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p116653462411"><a name="p116653462411"></a><a name="p116653462411"></a>Development Tools</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p15701144517139"><a name="p15701144517139"></a><a name="p15701144517139"></a>Provides a performance profiler platform for you to analyze system issues such as memory and performance, including hdc used for device debugging, APIs for performance tracing, and a performance profiler framework.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p1696110251415"><a name="p1696110251415"></a><a name="p1696110251415"></a>Standard system</p>
</td>
</tr>
<tr id="row1449910380242"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p238324932415"><a name="p238324932415"></a><a name="p238324932415"></a>DSoftBus</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p17499153862420"><a name="p17499153862420"></a><a name="p17499153862420"></a>Provides cross-process or cross-device communication capabilities for the OpenHarmony system and consists of the DSoftBus and IPC modules. The DSoftBus module enables distributed communication between near-field devices and provides device discovery, connection, networking, and data transmission functions, regardless of the communication mode. The IPC module enables communication between processes on a device or across devices.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p5499183812418"><a name="p5499183812418"></a><a name="p5499183812418"></a>All systems</p>
</td>
</tr>
<tr id="row1733413367244"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p1238318490244"><a name="p1238318490244"></a><a name="p1238318490244"></a>XTS</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p2334113611248"><a name="p2334113611248"></a><a name="p2334113611248"></a>Provides a set of OpenHarmony certification test suites, including the currently supported application compatibility test suite (ACTS) and the device compatibility test suite (DCTS) that will be supported in the future.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p03341936102418"><a name="p03341936102418"></a><a name="p03341936102418"></a>All systems</p>
</td>
</tr>
<tr id="row1817163212413"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p53831049112416"><a name="p53831049112416"></a><a name="p53831049112416"></a>System Apps</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p91717327249"><a name="p91717327249"></a><a name="p91717327249"></a>Provides system apps that are applicable to the OpenHarmony standard system, such as Launcher, SystemUI, and Settings. It also provides specific examples for you to build standard-system apps, which can be installed on all devices running the standard system.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p10171133218245"><a name="p10171133218245"></a><a name="p10171133218245"></a>Standard system</p>
</td>
</tr>
<tr id="row3577428102418"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p93831496249"><a name="p93831496249"></a><a name="p93831496249"></a>DFX</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p8578828122413"><a name="p8578828122413"></a><a name="p8578828122413"></a>Provides non-functional capabilities of OpenHarmony. It provides a logging system, app and system event logging APIs, the event log subscription service, and fault information generation and collection capabilities.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p18578102822411"><a name="p18578102822411"></a><a name="p18578102822411"></a>All systems</p>
</td>
</tr>
<tr id="row418795214250"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p860151102616"><a name="p860151102616"></a><a name="p860151102616"></a>Globalization</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p41871252102515"><a name="p41871252102515"></a><a name="p41871252102515"></a>If OpenHarmony devices and apps need to be used globally, they must meet the requirements of users in different regions on languages and cultures. The Globalization subsystem provides multi-language and multi-cultural capabilities for global use, including resource management and internationalization (i18n).</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p201658544174"><a name="p201658544174"></a><a name="p201658544174"></a>All systems</p>
</td>
</tr>
<tr id="row16870124919255"><td class="cellrowborder" valign="top" width="11.111111111111112%" headers="mcps1.1.4.1.1 "><p id="p136021513265"><a name="p136021513265"></a><a name="p136021513265"></a>Security</p>
</td>
<td class="cellrowborder" valign="top" width="80.80808080808082%" headers="mcps1.1.4.1.2 "><p id="p2871134913255"><a name="p2871134913255"></a><a name="p2871134913255"></a>Provides system, data, and app security capabilities to protect system and user data of OpenHarmony. Its functions include app integrity verification, app permission management, device authentication, and key management.</p>
</td>
<td class="cellrowborder" valign="top" width="8.080808080808081%" headers="mcps1.1.4.1.3 "><p id="p1487113491251"><a name="p1487113491251"></a><a name="p1487113491251"></a>All systems</p>
</td>
</tr>
</tbody>
</table>
| Subsystem| Description| Applicable To|
| -------- | -------- | -------- |
| Kernel| Supports small-sized LiteOS kernels that provide high performance and low power consumption for embedded devices and devices with limited resources, and supports Linux kernels that are applicable to the standard system.| Small system<br> Standard system |
| DFileSystem | Provides APIs for synchronizing local JS files. | Standard system |
| Graphics | Consists of user interface (UI) components, layout, animator, font, input event, window management, and rendering and drawing modules. It is an application framework that can be built on the LiteOS to develop OpenHarmony applications for Internet of Things (IoT) devices with limited hardware resources or on the standard OS to develop OpenHarmony applications for standard- and large-system devices (for example, tablet and lite smart devices). | All systems |
| Driver | Constructed using the C object-oriented programming (OOP) language. It provides a unified driver platform and is compatible with different kernels by means of platform decoupling and kernel decoupling. This unified driver platform is designed to provide a more precise and efficient development environment, where you develop a driver that can be deployed on different systems supporting Hardware Driver Foundation (HDF). | All systems |
| Power Management | Provides the following functions: restarting the system, managing running locks, managing and querying the system power status, querying and reporting the charging and battery status, and turning on/off the device screen, including adjusting the screen brightness. | Standard system |
| Pan-sensor | Contains sensors and misc devices. A sensor is a device to detect events or changes in an environment and send messages about the events or changes to another electronic device. Misc devices, including vibrators and LED lights, are used to send signals externally. You can call APIs to control the vibration of vibrators and lighting-on and lighting-off of LED lights. | Small system |
| Multimodal Input | OpenHarmony provides a Natural User Interface (NUI) for you to interact with your users. Unlike conventional categorization of input methods, OpenHarmony combines input methods of different dimensions into multimodal inputs, so you can easily arm your app with multi-dimensional, natural interaction features by using the application framework and system built-in UI components or APIs. Specifically, OpenHarmony currently supports traditional input methods such as key and touch inputs. | Standard system |
| Startup | Starts the OS middle layer between the time the kernel is started and the time apps are started. In addition, you can query and modify system attributes and restore factory settings. | All systems |
| Update | Supports over the air (OTA) update of OpenHarmony devices. | Standard system |
| Account | Provides interconnection with vendors' cloud account apps on the device side, and query and update of the cloud account login status. | Standard system |
| Compilation and Building | Provides a compilation and building framework based on Generate Ninja (GN) and Ninja. | All systems |
| Test | The test-driven development mode is used during the development process. You can develop new cases or modify existing cases to test new or enhanced system features. The test helps you develop high-quality code in the development phase. | All systems |
| Data Management | Provides local data management and distributed data management:<\br> - Local app data management for lightweight preference databases and relational databases<\br> - Distributed data service to provide apps with the capability to store data in the databases of different devices | Standard system |
| Programming Language Runtime | Provides the compilation and execution environment for programs developed with JavaScript or C/C++, basic libraries that support the runtime, and the runtime-associated APIs, compilers, and auxiliary tools. | All systems |
| Distributed Scheduler | Starts, registers, queries, and manages system services. | All systems |
| JS UI framework | OpenHarmony UI development framework that supports web-development-like paradigm. | All systems |
| Multimedia | Provides easy-to-use APIs for developing multimedia components such as audio, video, and camera, and enables apps to use multimedia resources of the system. | All systems |
| Event Notification | Provides the common event management capabilities that allow apps to subscribe to, unsubscribe from, publish, and receive common events (such as screen-on/off events and USB device attachment/detachment events). | Standard system |
| Misc Services | Provides the function of setting the time. | Standard system |
| Bundle management | Provides bundle installation, uninstallation, update, and query capabilities. | All systems |
| Telephony | Provides basic communication capabilities of the cellular network, such as SIM cards, network search, cellular data, cellular calls, SMS, and MMS, as well as easy-to-use APIs for you to manage multiple types of calls and data network connections. | Standard system |
| Utils | Stores basic OpenHarmony components, which can be used by OpenHarmony subsystems and upper-layer apps. | All systems |
| Development Tools | Provides a performance profiler platform for you to analyze system issues such as memory and performance, including hdc used for device debugging, APIs for performance tracing, and a performance profiler framework. | Standard system |
| DSoftBus | Provides cross-process or cross-device communication capabilities for the OpenHarmony system and consists of the DSoftBus and IPC modules. The DSoftBus module enables distributed communication between near-field devices and provides device discovery, connection, networking, and data transmission functions, regardless of the communication mode. The IPC module enables communication between processes on a device or across devices. | All systems |
| XTS | Provides a set of OpenHarmony compatibility test suites, including the currently supported application compatibility test suite (ACTS) and the device compatibility test suite (DCTS) that will be supported in the future. | All systems |
| System Apps | Provides system apps that are applicable to the OpenHarmony standard system, such as Launcher, SystemUI, and Settings. It also provides specific examples for you to build standard-system apps, which can be installed on all devices running the standard system. | Standard system |
| DFX | Provides non-functional capabilities of OpenHarmony. It provides a logging system, app and system event logging APIs, the event log subscription service, and fault information generation and collection capabilities. | All systems |
| Globalization | If OpenHarmony devices and apps need to be used globally, they must meet the requirements of users in different regions on languages and cultures. The Globalization subsystem provides multi-language and multi-cultural capabilities for global use, including resource management and internationalization (i18n). | All systems |
| Security | Provides system, data, and app security capabilities to protect system and user data of OpenHarmony. Its functions include app integrity verification, app permission management, device authentication, and key management. | All systems |
## Supported Development Boards<a name="section25831825174123"></a>
......@@ -344,10 +158,8 @@ Currently, OpenHarmony supports the development boards listed in the following t
## Getting Started<a name="section44681652104210"></a>
- [Getting started for device development](device-dev/quick-start/quickstart-ide-lite-overview.md)
- [Getting started for application development](application-dev/quick-start/start-overview.md)
- [Getting Started for Device Development](device-dev/quick-start/quickstart-ide-lite-overview.md)
- [Getting Started for Application Development](application-dev/quick-start/start-overview.md)
## Code Repository Addresses<a name="section107651249181914"></a>
......@@ -377,15 +189,15 @@ For details about how to obtain the source code of OpenHarmony, see [Source Cod
## How to Participate<a name="section19611528174215"></a>
For details about how to join in the OpenHarmony community, see [OpenHarmony Community](https://gitee.com/openharmony/community/blob/master/README.md).
For details about how to join in the OpenHarmony community, see [OpenHarmony Community](https://gitee.com/openharmony/community/blob/master/README-EN.md).
For details about how to contribute, see [Contribution](https://gitee.com/openharmony/docs/blob/master/en/contribute/contribution.md).
For details about how to contribute, see [How to Contribute](contribute/how-to-contribute.md).
## License Agreement<a name="section1245517472115"></a>
OpenHarmony complies with Apache License Version 2.0. For details, see the LICENSE in each repository.
OpenHarmony uses third-party open-source software and licenses. For details, see [Third-Party Open-Source Software](https://gitee.com/openharmony/docs/blob/master/zh-cn/contribute/%E7%AC%AC%E4%B8%89%E6%96%B9%E5%BC%80%E6%BA%90%E8%BD%AF%E4%BB%B6%E5%8F%8A%E8%AE%B8%E5%8F%AF%E8%AF%81%E8%AF%B4%E6%98%8E.md).
OpenHarmony uses third-party open-source software and licenses. For details, see [Third-Party Open-Source Software](contribute/third-party-open-source-software-and-license-notice.md).
## Contact Info<a name="section61728335424"></a>
......@@ -396,4 +208,3 @@ Website:
Email:
contact@openharmony.io
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