Please support the FreeRTOS project!

The FreeRTOS project has been generated through many years of hard work - but is provided to you here free of charge. Please show your support by buying a book, or simply making a donation. Thank you.

Documentation

A FreeRTOS eBook and reference manual are available to purchase for a small fee. Help yourself get started quickly while also helping the FreeRTOS project!

Donations

Donations can be made using a PayPal account, credit card or bank transfer using the button below. Thank you in advance.

RTOS Source Code Downloads

The download includes source code for every supported port and every demo application project. The kernel itself only consists of three C files and one portable layer file. Please read the quick start guide to understand the directory structure and get up and running quickly.

Please see below for a list of known issues with the current release.

If you have not already done so - please take the time to complete the very short WEB site users survey. This will allow us to improve the products and services we offer.
Download the RTOS source code from here. It is available as a standard zip file or as a self extracting zip file.
Unzip the source code into a suitable directory - taking care to ensure the directory structure within the zip file is maintained.
The RTOS "Port" pages of this site contain detailed build instructions for each RTOS port. Please also consult the "configuration" section of the RTOS API documentation.
Refer to the version change description for more details.
A donation would be gratefully received - but is of course voluntary.

Mailing List

You can be kept up to date with any bug fixes or enhancements by sending an email to "list AT FreeRTOS.org" (obviously form this into a valid email address) with subject ADD. Emails are fairly infrequent and kept brief. For active community support use the forum.

Forum

See the Contact and Support page for information on accessing the FreeRTOS forum.

Known Issues with the Current 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.
ARM GCC builds
Some GCC compilers currently have a bug where the interworking code (the bit of code that changes processor state) is output as all NOPs when calling a THUMB function from a naked ARM function. This is not actually a FreeRTOS issue but is catching some people out. The fix seems to be to replace the naked C function with a true assembly function.
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.

Copyright (C) 2010 Real Time Engineers Ltd.
Any and all data, files, source code, html content and documentation included in the FreeRTOS 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. FreeRTOS^TM and FreeRTOS.org^TM are trade marks of Real Time Engineers Ltd..