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Documentation

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!

RTOS Source Code Downloads

1. 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.

2. Download the RTOS source code from here. It is available as a standard zip file, and as a self extracting zip file.

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 quick start guide 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

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 Version

• Standard Win32 simulator demo project

  The demo in the FreeRTOS/Demo/WIN32-MSVC directory will not build because the FreeRTOS+Trace source files it references have since moved. This has been corrected in SVN already, and these corrections will be in the next official release.

• Software timers and FreeRTOS-MPU
  The software timer API is not yet included in the official distribution of FreeRTOS/source/include/mpu_wrappers.h.

• Code Composer Studio Cortex-R4 port in co-operative mode

  To build the TMS570 and RM48 demos with configUSE_PREEMPTION set to 0 it is necessary to edit vPortNonPreemptiveTick() defined in the relevant port.c file to replace the line RTI->INTFLAG = 0x00000001; with portRTI_INTFLAG_REG = 0x00000001;. Remember also to ensure vPortNonPreemptiveTick() is installed in the vector table in place of vPortPreemptiveTick().

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.