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# Azure RTOS LevelX
# Eclipse ThreadX LevelX

LevelX provides NAND and NOR flash wear leveling facilities to embedded applications. Since both NAND and NOR flash memory can only be erased a finite number of times, it’s critical to distribute the flash memory use evenly. This is typically called **wear leveling** and is the purpose behind LevelX. LevelX presents to the user an array of logical sectors that are mapped to physical flash memory inside of LevelX. Applications may use LevelX in conjunction with FileX or may read/write logical sectors directly. LevelX is designed for fault tolerance. Flash updates are performed in a multiple-step process that can be interrupted in each step. LevelX automatically recovers to the optimal state during the next operation.

## Getting Started

Azure RTOS LevelX as part of Azure RTOS has been integrated to the semiconductor's SDKs and development environment. You can develop using the tools of choice from [STMicroelectronics](https://www.st.com/content/st_com/en/campaigns/x-cube-azrtos-azure-rtos-stm32.html), [NXP](https://www.nxp.com/design/software/embedded-software/azure-rtos-for-nxp-microcontrollers:AZURE-RTOS), [Renesas](https://github.com/renesas/azure-rtos) and [Microchip](https://mu.microchip.com/get-started-simplifying-your-iot-design-with-azure-rtos).
LevelX as part of Eclipse ThreadX has been integrated to the semiconductor's SDKs and development environment. You can develop using the tools of choice from [STMicroelectronics](https://www.st.com/content/st_com/en/campaigns/x-cube-azrtos-azure-rtos-stm32.html), [NXP](https://www.nxp.com/design/software/embedded-software/azure-rtos-for-nxp-microcontrollers:AZURE-RTOS), [Renesas](https://github.com/renesas/azure-rtos) and [Microchip](https://mu.microchip.com/get-started-simplifying-your-iot-design-with-azure-rtos).

See [Overview of Azure RTOS LevelX](https://learn.microsoft.com/azure/rtos/levelx/overview-levelx) for the high-level overview, and all documentation and APIs can be found in: [Azure RTOS LevelX documentation](https://learn.microsoft.com/azure/rtos/levelx/).
See [Overview of Eclipse ThreadX LevelX](https://github.com/eclipse-threadx/rtos-docs/blob/main/rtos-docs/levelx/index.md) for the high-level overview.

## Repository Structure and Usage

Expand All @@ -19,7 +19,7 @@ See [Overview of Azure RTOS LevelX](https://learn.microsoft.com/azure/rtos/level
├── LICENSE.txt # License terms
├── LICENSE-HARDWARE.txt # Licensed hardware from semiconductors
├── CONTRIBUTING.md # Contribution guidance
└── SECURITY.md # Microsoft repo security guidance
└── SECURITY.md # Repo security guidance

### Branches & Releases

Expand Down Expand Up @@ -74,15 +74,15 @@ The master branch has the most recent code with all new features and bug fixes.

## Component dependencies

The main components of Azure RTOS are each provided in their own repository, but there are dependencies between them, as shown in the following graph. This is important to understand when setting up your builds.
The main components of Eclipse ThreadX are each provided in their own repository, but there are dependencies between them, as shown in the following graph. This is important to understand when setting up your builds.

![dependency graph](docs/deps.png)

> You will have to take the dependency graph above into account when building anything other than ThreadX itself.

### Building and using the library

Instruction for building the LevelX as static library using Arm GNU Toolchain and CMake. If you are using toolchain and IDE from semiconductor, you might follow its own instructions to use Azure RTOS components as explained in the [Getting Started](#getting-started) section.
Instruction for building the LevelX as static library using Arm GNU Toolchain and CMake. If you are using toolchain and IDE from semiconductor, you might follow its own instructions to use Eclipse ThreadX components as explained in the [Getting Started](#getting-started) section.

1. Install the following tools:

Expand All @@ -95,14 +95,14 @@ Instruction for building the LevelX as static library using Arm GNU Toolchain an
1. Cloning the repo.

```bash
$ git clone --recursive https://github.com/azure-rtos/levelx.git
$ git clone --recursive https://github.com/eclipse-threadx/levelx.git
```

1. Define the features and addons you need in `lx_user.h` and build together with the component source code. You can refer to [`lx_user_sample.h`](https://github.com/azure-rtos/levelx/blob/master/common/inc/lx_user_sample.h) as an example.

1. Building as a static library

Each component of Azure RTOS comes with a composable CMake-based build system that supports many different MCUs and host systems. Integrating any of these components into your device app code is as simple as adding a git submodule and then including it in your build using the CMake `add_subdirectory()`.
Each component of Eclipse ThreadX comes with a composable CMake-based build system that supports many different MCUs and host systems. Integrating any of these components into your device app code is as simple as adding a git submodule and then including it in your build using the CMake `add_subdirectory()`.

While the typical usage pattern is to include LevelX into your device code source tree to be built & linked with your code, you can compile this project as a standalone static library to confirm your build is set up correctly.

Expand All @@ -114,31 +114,23 @@ Instruction for building the LevelX as static library using Arm GNU Toolchain an
$ cmake --build ./build
```

## Professional support

[Professional support plans](https://azure.microsoft.com/support/options/) are available from Microsoft. For community support and others, see the [Resources](#resources) section below.

## Licensing

License terms for using Azure RTOS are defined in the LICENSE.txt file of this repo. Please refer to this file for all definitive licensing information. No additional license fees are required for deploying Azure RTOS on hardware defined in the [LICENSED-HARDWARE.txt](./LICENSED-HARDWARE.txt) file. If you are using hardware not listed in the file or having licensing questions in general, please contact Microsoft directly at https://aka.ms/azrtos-license.
License terms for using Eclipse ThreadX are defined in the LICENSE.txt file of this repo. Please refer to this file for all definitive licensing information.

## Resources

The following are references to additional Azure RTOS resources:
The following are references to additional Eclipse ThreadX resources:

- **Product introduction and white papers**: https://azure.com/rtos
- **General technical questions**: https://aka.ms/QnA/azure-rtos
- **Product issues and bugs, or feature requests**: https://github.com/azure-rtos/levelx/issues
- **Licensing and sales questions**: https://aka.ms/azrtos-license
- **Product roadmap and support policy**: https://aka.ms/azrtos/lts
- **Blogs and videos**: http://msiotblog.com and https://aka.ms/iotshow
- **Azure RTOS TraceX Installer**: https://aka.ms/azrtos-tracex-installer
- **Product introduction**: https://github.com/eclipse-threadx/rtos-docs
- **Product issues and bugs, or feature requests**: https://github.com/eclipse-threadx/levelx/issues
- **TraceX Installer**: https://aka.ms/azrtos-tracex-installer

You can also check [previous questions](https://stackoverflow.com/questions/tagged/azure-rtos+levelx) or ask new ones on StackOverflow using the `azure-rtos` and `levelx` tags.
You can also check [previous questions](https://stackoverflow.com/questions/tagged/azure-rtos+levelx) or ask new ones on StackOverflow using the `threadx` and `levelx` tags.

## Security

Azure RTOS provides OEMs with components to secure communication and to create code and data isolation using underlying MCU/MPU hardware protection mechanisms. It is ultimately the responsibility of the device builder to ensure the device fully meets the evolving security requirements associated with its specific use case.
Eclipse ThreadX provides OEMs with components to secure communication and to create code and data isolation using underlying MCU/MPU hardware protection mechanisms. It is ultimately the responsibility of the device builder to ensure the device fully meets the evolving security requirements associated with its specific use case.

## Contribution

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