Directories:



+ FreeRTOS/source contains the FreeRTOS real time kernel source code.



+ FreeRTOS/demo contains a pre-configured demo project for every official 

  FreeRTOS port.

  

+ FreeRTOS-Plus contains additional FreeRTOS components and third party 

  complementary products.  THESE ARE LICENSED SEPARATELY FROM FreeRTOS although

  all contain open source options.  See the license files in each respective

  directory for information.

  

+ FreeRTOS-Plus/Demo_Projects_Using_FreeRTOS_Simulator contains pre-configured

  demo projects for the FreeRTOS-Plus components.  The demo projects run in

  a Windows environment using the FreeRTOS windows simulator.  These are 

  documented on the FreeRTOS web site http://www.FreeRTOS.org/plus



+ See http://www.freertos.org/a00017.html for full details of the directory 

  structure and information on locating the files you require.



Further readme files are contains in sub-directories as appropriate.

  

The easiest way to use FreeRTOS is to start with one of the pre-configured demo 

application projects (found in the FreeRTOS/Demo directory).  That way you will

have the correct FreeRTOS source files included, and the correct include paths

configured.  Once a demo application is building and executing you can remove

the demo application file, and start to add in your own application source

files.



See also -

http://www.freertos.org/FreeRTOS-quick-start-guide.html

http://www.freertos.org/FAQHelp.html