harmony 鸿蒙Quick Start Overview

2022-12-05
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Quick Start Overview

OpenHarmony is an open-source distributed operating system for all scenarios. It uses a component-based design to better suit devices with 128 KiB to GiB-level of RAM. You can integrate a flexible combination of system components based on the hardware capabilities of devices.

OpenHarmony defines three basic system types. You only need to select a suitable system type and configure the mandatory component set, thereby developing a system for your device at the minimum workload. The definitions of the basic system types are provided as follows for your reference:

Table 1 Basic system types

System Type	Processor	Minimum Memory	Competence
Mini system	MCU processors, such as Arm Cortex-M and 32-bit RISC-V	128 KiB	Provides a variety of lightweight network protocols, a lightweight graphics framework, and a wide range of read/write components with the Internet of Things (IoT) bus. Applicable products include connection modules, sensors, and wearables for smart home.
Small system	Application processors, such as Arm Cortex-A	1 MiB	Provides higher security capabilities, a standard graphics framework, and video encoding and decoding capabilities. Applicable products include smart home products such as IP cameras, peephole cameras, and routers as well as smart travel products such as event data recorders (EDRs).
Standard system	Application processors, such as Arm Cortex-A	128 MiB	Provides a complete application framework supporting enhanced interactions, 3D GPU, hardware composer, diverse components, and rich animations. Applicable products include high-end refrigerator displays.

This document helps you quickly get started with OpenHarmony device development, from environment setup to “Hello World” program running.

Operations

To accommodate different developer habits, OpenHarmony provides two modes for getting started with OpenHarmony device development:

Table 2 Modes for getting started

Mode	Tool	Description	Target Audience
IDE mode	DevEco Device Tool	DevEco Device Tool, an integrated development environment (IDE), is used for one-stop development, covering dependency installation, building, burning, and running. DevEco Device Tool works in the Windows+Ubuntu hybrid development environment. - Windows: code development, debugging, and image burning - Ubuntu: source code compilation DevEco Device Tool provides an intuitive GUI to accelerate your development.	- Developers who are unfamiliar with the command line - Developers who are accustomed to GUI-based operations
CLI mode	Command line tools	The command-line interface (CLI) is used to download and install the compilation tools. In Linux, commands are used to build source code. In Windows, the tools provided by the development board vendors are used to burn an image. The CLI mode allows you to install the required toolchain easily in a centralized manner.	Developers who are familiar with the command line