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1 # LiteOS-M Kernel<a name="EN-US_TOPIC_0000001096757661"></a>
3 -   [Introduction](#section11660541593)
4 -   [Directory Structure](#section161941989596)
5 -   [Constraints](#section119744591305)
6 -   [Usage](#section3732185231214)
7 -   [Contribution](#section1371123476307)
8 -   [Repositories Involved](#section1371113476307)
10 ## Introduction<a name="section11660541593"></a>
12 …-M is a lightweight operating system kernel designed for the Internet of Things (IoT) field. It fe…
13 **Figure1** shows the architecture of the LiteOS-M kernel.
15 **Figure 1** Architecture of the OpenHarmony LiteOS-M kernel<a name="fig0865152210223"></a>
17 ![](figures/architecture-of-openharmony-the-liteos-cortex-m-kernel.png "OpenHarmony-LiteOS-M Kernel…
19 ## Directory Structure<a name="section161941989596"></a>
28 │   │   ├── cortex-m3    # Code of the cortex-m3 architecture
29 │   │   ├── cortex-m33   # Code of the cortex-m33 architecture
30 │   │   ├── cortex-m4    # Code of the cortex-m4 architecture
31 │   │   ├── cortex-m7    # Code of the cortex-m7 architecture
36 │   ├── risc-v           # Code of the risc-v architecture
37 │   │   ├── nuclei       # Code of the nuclei system technology risc-v architecture
38 │   │   └── riscv32      # Code of the risc-v architecture
67 ## Constraints<a name="section119744591305"></a>
69 OpenHarmony LiteOS-M supports only C and C++.
75 ## Usage<a name="section3732185231214"></a>
77 …-M kernel build system is a modular build system based on Generate Ninja (GN) and Ninja. It suppor…
81 …a development board, you must set up the basic system environment for OpenHarmony first. The basic…
85 …uisition](https://gitee.com/openharmony/docs/blob/HEAD/en/device-dev/get-code/sourcecode-acquire.m…
95 The LiteOS-M kernel porting projects for specific development boards are provided by community deve…
97 -   Cortex-M3:
99     - STM32F103 https://gitee.com/rtos_lover/stm32f103_simulator_keil
101 … the Keil project code for building the OpenHarmony LiteOS-M kernel based on the STM32F103 chip ar…
103 -   Cortex-M4:
105     - STM32F429IGTb https://gitee.com/harylee/stm32f429ig_firechallenger
107 …This repository provides the project code for porting the OpenHarmony LiteOS-M kernel to support t…
109 ## Contribution<a name="section1371123476307"></a>
115 [Liteos-M kernel coding style guide](https://gitee.com/openharmony/kernel_liteos_m/wikis/OpenHarmon…
117 How to contribute a chip based on Liteos-M kernel:
119 [ Board-Level Directory Specifications](https://gitee.com/openharmony/docs/blob/HEAD/en/device-dev/…
121 [Mini System SoC Porting Guide](https://gitee.com/openharmony/docs/blob/HEAD/en/device-dev/porting/…
123 ## Repositories Involved<a name="section1371113476307"></a>
125 [Kernel Subsystem](https://gitee.com/openharmony/docs/blob/HEAD/en/readme/kernel-subsystem.md)