Each real time kernel port consists of three files that contain the core kernel components and are common to every port, and one or more files that are specific to a particular microcontroller and or compiler.
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The FreeRTOS/Source directory contains the three files that are common to every port - list.c, queue.c and tasks.c. The kernel is contained within these three files. croutine.c implements the optional co-routine functionality - which is normally only used on very memory limited systems.
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The FreeRTOS/Source/Portable directory contains the files that are specific to a particular microcontroller and or compiler.
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The FreeRTOS/Source/include directory contains the real time kernel header files.
See the readme file in the FreeRTOS/Source/Portable directory for more information.