RTOS Implementation

Introduction

This section describes part of the FreeRTOS implementation.

These pages will be helpful if you:

wish to modify the FreeRTOS source code.
port the real time kernel to another microcontroller or prototyping board.
are new to using an RTOS and wish to get more information on their operation and implementation.

The FreeRTOS real time kernel has been ported to a number of different microcontroller architectures. The Atmel AVR port was chosen for this example due to:

the simplicity of the AVR architecture.
the free availability of the utilized WinAVR (GCC) development tools.
the low cost of the STK500 prototyping board

The section concludes with a detailed step by step look at one complete context switch.

Building Blocks

Detailed Example

The final part of section 2 shows how these building blocks and source code modules are used to achieve a context switch on the AVR microcontroller. The example demonstrates in seven steps the process of switching from a lower priority task, called TaskA, to a higher priority task, called TaskB.

The source code is compatible with the WinAVR development tools.

RTOS Implementation

Introduction

Building Blocks

Detailed Example

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