This article is concern with the rtos that can port to AVR microcontroller.I list only rtos that is open source
and free for donwload.You can look for them as below…
1.AvrX Real Time Kernel
It is lightweight and support important features of RTOs such as Message Queues, Semaphores , fully
preemption etc.It is cooperative kernel too.You can download the document of AvrX here or here.
2.CocoOS
CocoOS is also lightweight and it is cooperative kernel.It can use with ATmega8/16/32.It is a cooperative task scheduler and its structure is small and easy.You can download the documents of this RTOS here
or here.
3.FreeRTOS
This is a popular RTOS is this world.It can port to various kinds of microcontroller , so I don’t talk about
it.You can find the information at its website yourself.
4.YAVRTOS (Yet Another Atmel® AVR® Real-Time Operating System)
This RTOS is only suitable with ATmega32 (It was tested only with ATmega32).It implemented mailboxes,
semaphores and mutexes.The disadvantage of YAVRTOS is that it’s not support defining task prioriy and the mutex mechanism of this RTOS is weak.I think disabling interrupt every time when want to access a shared resource is not a good way to do and you should avoid doing that.
5.pC/OS
pC/OS is RTOS that was developed base on uC/OS 1.00 (Its kernal based on uC/OS 1.00).It can port to ATMega32, AVR32 and ATMega128.Its document is easy to read.
6.uSmartX
It is non-preemptive kernel.It has memory management function together with task and time control functions.uSmartX is very old (it exist since 2006).This RTOS is suitable for small-footprint embedded system because of it consume little memory of the system.
7.COMATOS
COMATOS is the RTOS for ATMEL microcontroller (COMATOS is abbreviated from “COrnell Miniature ATmel Operating System “).It is simple,lightweight (Use memory not exceed 2K of program memory) and also non-preemptive RTOS.The source code has boht Assembly version and C version (THE C version is written for AT90S8515 ).Its website has a tutorial for using this RTOS but in Assembly language.
8.Jennaron
It is the project of Task Dispatcher.It contain C source code for implement this project and it also have
a PDF document to describe the souce code too.
9.OPEX
It is the unique operating system for AVR.It was written in C for WinAVR (GCC) that can use optinally with Atman IDE.It contain the Scheduler for control each process (Cause process to run when desired) and inter-process communication like Semaphore.
The article “RTOS of AVR” is not end by this post.In the next post I will write about RTOS for AVR again as the episode two.
Want to know more about IPC (Inter-Process Communication , please visit wikipedia)
Reference site : http://www.electoday.com/bbs/viewthread.php?tid=1451&extra=&highlight=avr&page=1 (This topic started by wlasoi)
Thank you very much,
Admin.