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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)
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…
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
69 OpenHarmony LiteOS-M supports only C and C++.
77 …-M kernel build system is a modular build system based on Generate Ninja (GN) and Ninja. It suppor…
81 …nt](https://gitee.com/openharmony/docs/blob/HEAD/en/device-dev/quick-start/quickstart-lite-env-set…
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 …This repository provides the Keil project code for building the OpenHarmony LiteOS-M kernel based …
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…
113 [Commit message spec](https://gitee.com/openharmony/kernel_liteos_m/wikis/Commit%20message%E8%A7%84…
115 …teos-M kernel coding style guide](https://gitee.com/openharmony/kernel_liteos_m/wikis/OpenHarmony%…
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 …ting Guide](https://gitee.com/openharmony/docs/blob/HEAD/en/device-dev/porting/porting-minichip.md)
125 [Kernel Subsystem](https://gitee.com/openharmony/docs/blob/HEAD/en/readme/kernel-subsystem.md)