All rights reserved. Click here to view a static menu. A specific development tool compiler, debugger, etc. A specific hardware platform prototyping or evaluation board.
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All rights reserved. Click here to view a static menu. Porting FreeRTOS to a completely different and as yet unsupported microcontroller is not a trivial task.
The aim of this page is to describe the house keeping preliminaries required to get a new port started. Each port is moderately unique and very dependent on the processor and tools being used, so this page cannot provide specifics on the porting detail.
There are however plenty of other FreeRTOS ports already in existence and it is suggested that these are used as a reference. Porting within the same processor family is a much more straight forward task — for example, from one ARM7 based device to another. The documentation page detailing how to modify an existing demo application would be a good point to start reading if this is your aim. Unzip the files into a convenient location, taking care to maintain the directory structure.
Familiarise yourself with the source code organisation and directory structure. Copy empty port. See existing port. You can create a stub file from one of these existing files by simply deleting the function and macro bodies. Create a directory that will contain the demo application files for the [architecture] port. Again these should be edited to be just stub files.
Copy into this directory a ParTest. These three functions need implementing for your development board. Having LED outputs working will facilitate the rest of the required work. Take a look at the many existing ParTest. Creating a Project Now all the required files are in place you need to create a project or makefile that will successfully build them. Obviously they just contain stubs so will not yet do anything, but once they are building the stubs can incrementally be replaced with working functions.
Once the project is compiling the portable layer stubs require implementation. It is suggested that pxPortInitialiseStack is the first function to be implemented.
To implement pxPortInitialiseStack you must first decide upon your task context stack frame structure, which is very architecture dependent.
Creating a New FreeRTOS Port
Developed in partnership with the world's leading chip companies over a year period, and now downloaded every seconds, FreeRTOS is a market-leading real-time operating system RTOS for microcontrollers and small microprocessors. Distributed freely under the MIT open source license, FreeRTOS includes a kernel and a growing set of libraries suitable for use across all industry sectors. FreeRTOS is built with an emphasis on reliability and ease of use. FreeRTOS is an open-source project. A major denotation indicates the addition of new features or significant updates to multiple libraries.
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