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klawson — Fri, 13 Nov 2009 22:29:01 +0000

Atomthreads is a free, lightweight, portable, real-time scheduler for embedded systems.

It is released under the flexible, open source BSD license and is free to use for commercial or educational purposes without restriction.

It is targeted at systems that need only a scheduler and the usual RTOS primitives. No file system, IP stack or device drivers are included, but developers can bolt on their own as required. Atomthreads will always be a small number of C files which are easy to port to any platforms that require threading by adding a simple architecture-specific file.

Features

OS Features
- Preemptive scheduler with 255 priority levels
- Round-robin at same priority level
- Semaphore
- Mutex
- Queue
- Timers
Lightweight: the entire operating system fits into a few C files
Highly portable ANSI C code not tied to any compiler
Easy to read, well-documented, doxygen-commented code
Can be ported to any CPU architecture with a single architecture-specific module
Automated test suite proves reliable kernel operation
Free and flexible open source, BSD-licensed code
Readable code provides a good platform for learning RTOS internals
For a more complete feature list, see the Features page.

Supported CPU Architectures

To prove the lightweight and portable nature of Atomthreads, ports have been released for a range of architectures from small 8-bit microcontrollers to larger 32-bit processors.

CPU Architecture	Compiler Toolchain	Port Documentation
AVR/ATmega	GCC	[View Documentation]
STM8/STM8S	Cosmic, IAR, Raisonance, SDCC	[View Documentation]
ARM926EJ-S	GCC
DaVinci DM365/DM368 (ARM9)	GCC

Documentation

All source is documented using Doxygen. Generated documentation can be found here:

Kernel
Architecture ports: AVR, STM8

To find out more about the internals of Atomthreads, and to learn how to port it to your target architecture, read the Porting Guide.

Atomthreads: Open Source RTOS

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Supported CPU Architectures

Documentation