Introduction

FreeRTOS is one of the market leading real-time operating systems (RTOS) for embedded microcontrollers. It is professionally developed, strictly quality controlled, robust, supported (archive), free to use in commercial products without a requirement to expose proprietary source code, and has no IP infringement risk.

CMSIS-RTOS v2 is a common API for real-time operating systems (RTOS). It provides a standardized programming interface that is portable to many RTOS and enables software components that can work across multiple RTOS systems. It supports the Armv8-M architecture, dynamic object creation, for multi-core systems, and has a binary compatible interface across ABI compliant compilers.

Using this software pack, users can choose between a native FreeRTOS implementation or one that is adhering to the CMSIS-RTOS2 API and using FreeRTOS under the hood. The CMSIS-RTOS2 API enables programmers to create portable application code to be used with different RTOS kernels (for example Keil RTX5).

This documentation shows you:

how to create a new microcontroller project using FreeRTOS from scratch.
Various Example projects show you the usage of FreeRTOS in native and CMSIS-RTOS2 mode.
the Technical data and limitations of this implementation.
Revision History

License

The CMSIS-FreeRTOS implementation is provided free of charge by Arm under the Apache 2.0 license.
The FreeRTOS kernel source files are released under the MIT open source license.

ARM::CMSIS-FreeRTOS Pack

The ARM::CMSIS-FreeRTOS pack contains the following:

File/Directory	Content
CMSIS/Documentation	This documentation.
CMSIS/RTOS2	CMSIS-RTOS2 compliant implementation of FreeRTOS.
License	FreeRTOS license agreement.
Source	FreeRTOS kernel source code.
ARM.CMSIS-FreeRTOS.pdsc	Package description file in CMSIS-Pack format.