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  1. Packs
  2. CMSIS-FreeRTOS

CMSIS-FreeRTOS

11.3.0
Arm

  • Pack Type

    Software Pack

Bundle of FreeRTOS for Cortex-M and Cortex-A

Overview

This CMSIS-Pack provides a CMSIS-RTOS2 API implementation based on FreeRTOS.

CMSIS-RTOS2 Implementation using FreeRTOS

The CMSIS-RTOS v2 API is implemented as a wrapper layer on top of the FreeRTOS kernel. It maps the standardized CMSIS-RTOS2 functions to native FreeRTOS kernel calls, enabling portable application code that can be used across different RTOS kernels.

Key characteristics of this implementation:

  • Supports threads, mutexes, semaphores, event flags, message queues, timers, and memory pools.
  • Supports both dynamic and static memory allocation for RTOS objects.
  • Supports Event Recorder for FreeRTOS event tracing and debugging.
  • Validated against the CMSIS-RTOS2 validation suite.

See Technical Data and Limitations for a full list of supported features and known deviations from the CMSIS-RTOS2 standard.

Examples

The pack includes CMSIS Solution based examples that can be built for a wide range of Cortex-M targets using Arm Fixed Virtual Platforms (FVP) simulation models — no hardware required.

Example Description
Hello Simple Hello World application using CMSIS-RTOS2. Use as a starting point for new applications.
TrustZone TrustZone application for Armv8-M. Demonstrates booting from the secure side and using non-secure callable function from the non-secure side.

Examples support Cortex-M0 through Cortex-M85 targets. They can be built using Arm Keil Studio extensions for VS Code or via the CMSIS-Toolbox command-line tools.

Reference Applications

The pack includes a hardware-agnostic CMSIS Solution based reference application that can be deployed to any development board that provides the required board layer.

Reference Application Description
Blinky Simple CMSIS-RTOS2 application that blinks an LED and responds to a button. Use as a starting point to verify tool setup on real hardware.

Reference applications can be deployed to a development board using Arm Keil Studio extensions for VS Code. See CMSIS-Toolbox - Reference Applications to learn more about the reference application concept.

CMSIS-Pack contents

  📦
  ┣ 📂 CMSIS/Config             CMSIS-FreeRTOS configuration templates
  ┣ 📂 CMSIS/Examples           Pre-configured examples using Arm FVP simulation models
  ┣ 📂 CMSIS/RefApp             Reference application using FreeRTOS
  ┣ 📂 CMSIS/Source             CMSIS-RTOS2 implementation using FreeRTOS
  ┣ 📂 Documentation            Pre-built documentation
  ┣ 📂 Overview                 Contains this README
  ┣ 📂 Source                   FreeRTOS kernel source code
  ┣ 📄 ARM.CMSIS-FreeRTOS.pdsc  Pack description file
  ┣ 📄 ARM.CMSIS-FreeRTOS.sha1  Checksums of all the files
  ┗ 📄 LICENSE                  License text

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