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Documentation

The FreeRTOS project has been generated through many years of hard work - but is provided to you from this page free of charge. Please show your support by buying a book. Thank you.

Purchasing FreeRTOS documentation will not only help you by ensuring you get up and running as quickly as possible, and with an in-depth knowledge of how to use FreeRTOS, it will help the FreeRTOS project to continue with its mission of providing professional grade, cross platform, de facto standard solutions for microcontrollers - completely free of charge!

- Buy a PDF book and Reference Manual -




RTOS Source Code Download Instructions

Follow the steps below to download the latest FreeRTOS versions:
  1. Please keep up to date by joining the announcements mailing list for infrequent comprehensive notifications. We respect your privacy, so do not provide email addresses to any third party. Every email sent contains unsubscribe instructions.

  2. Click to download the latest official release from SourceForge which is available as both a standard zip file (.zip), and as a self extracting zip file (.exe).

  3. Unzip the source code into a suitable directory - taking care to ensure the directory structure within the zip file is maintained. Please read the source code organisation and quick start guide pages to understand the directory structure and get up and running quickly.

  4. The monitored support forum, known issue list, FAQ and version change description, all provide additional resources.

Mailing List

You can keep up to date with very occasional announcements by adding yourself to the FreeRTOS mailing list.

Emails are infrequent and kept short. We respect your privacy, so do not provide email addresses to any third party. Every email sent contains unsubscribe instructions.


Known Issues with the Current Release

  • The definition of the StaticTask_t structure is incorrect if INCLUDE_xTaskAbortDelay is set to 1, or the MPU is used. The corrected structure definition can be obtained from here.

  • Relevant only to the ARM Cortex-M3 and ARM Cortex-M4 ports that support the memory protection unit (MPU): There is an error in the name of a constant used in the definition of the portEND_SWITCHING_ISR() macro. portNVIC_PENDSVSET should be portNVIC_PENDSVSET_BIT. portEND_SWITCHING_ISR() is implemented in the port specific portmacro.h header file.


Legacy Issues

  • Coldfire V2 CodeWarrior port

    The Coldfire V2 CodeWarrior code will not run with the latest (Eclipse) based CodeWarrior tools. A fix is posted on the support forum (post 4), and will be incorporated into the main release in due course.

  • Coldfire V1 CodeWarrior port

    The Coldfire V1 CodeWarrior projects will not automatically update to later CodeWarrior versions unless all unnecessary files are deleted from the FreeRTOS/Source directory first. See this support thread for more information.

  • MSP430 CrossWorks and GCC demos

    The CrossWorks demo has not yet been updated to use CrossWorks V2.0 or later. The GCC demo has not yet been updated to use the latest MSPGCC compiler version.

  • AVR32 demos

    The IAR Embedded Workbench demos for the AVR32 will not currently build if you are using a later version of the IAR tool chain. The issue is caused by changes to macro names within the compiler header files.

  • Silicon Labs SDCC ports

    Unfortunately these will not work with the latest compiler versions. The compiler version used to generate the port is now rather old, but is stated on the port documentation page.





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Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2016 Real Time Engineers Ltd.
Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.

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FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Renesas Electronics Gold Alliance RTOS Partner.jpg

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Atmel RTOS partner supporting ARM Cortex-M3 and AVR32 microcontrollers

STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Xilinx Microblaze and Zynq partner

Silicon Labs low power RTOS partner

Altera RTOS partner for Nios II and Cortex-A9 SoC

Freescale Alliance RTOS Member supporting ARM and ColdFire microcontrollers

Infineon ARM Cortex-M microcontrollers

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

Cypress RTOS partner supporting ARM Cortex-M3

Fujitsu RTOS partner supporting ARM Cortex-M3 and FM3

Microsemi (previously Actel) RTOS partner supporting ARM Cortex-M3

Atollic Partner

IAR Partner

Keil ARM Partner

Embedded Artists