1.Femto OS
It is the real RTOS for AVR.It had been ported to many series of AVR microcontroller

(44 AVR devices).The task can be specified to be preemptive or cooperative task.It has

lots of example code and its documents is very good (The document is integrated into the

source code as comment).

2.pico os
It is the RTOS that support large set of features and can be ported to various type

of microcontroller other than AVR.Currently it only support MegaAVR 32 (8 bit

microcontroller) but may be can config to support other AVR devices too.The source code

for AVR can use with WinAVR or AvrStudio 4.

3.Protothreads
Protothreads can use on AVR too.Please click here to read my last article about

Protothreads.

4.Contiki
Contiki is one of widely used RTOS.It is multi-tasking operating system that designed

for microcontroller with small memory.
It is suitable for implement wireless sensor networks because it provide IP

communication.Its processes use protothreads to provide threadlike programming style.

5.TinyOS
It is RTOS designed for wireless sensor network.This RTOS was written in the nesC

programming language.The task is non-preemptive and task is run depend upon FIFO order.

6.iRTOS
It support Atmel AVR 8 bit (also support Atmega128).It has preemptive and cooperative

scheduling mechanism.The disadvantage of this RTOS is that it is not well tested (may be

there are some bugs).The website said that this RTOS can be installed in 16 bit and 32

bit microcontroller too.

7. µC/OS-II
This is well-known RTOS used widely in the world, so I don’t talk about it.
You can find the information relate to µC/OS-II at its website by yourself.

8.csRTOS or 4AvrOS
This RTOS is cooperative schduler.
It support ATmega88/168/16 and other AVR series.It is single-stack RTOS that require

small memory area.This RTOS was written using WinAVR C compiler.4AvrOS is the new version

of csRTOS (Most features are remain the same).

9.XMK (eXtreme Minimal Kernel)
It is a preemptive and multithread kernal suitable for small microcontrollers (8 bit).However it can run on 16 or 32 bit microcontroller.This RTOS implemented the features such as mailboxes, memory pools, file descriptors, hardware device drivers, and TCP/IP networking.

And this is the end of the two series “RTOS for AVR” microcontroller.

Thank you so much,
Jitkasem Pintaya.

Reference site : Electoday

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Related posts:

1. RTOS for AVR part one.
2. Introduction to RTOS.
3. RTOS for small embedded system.