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RE: [avr-gcc-list] cbr and negative numbers

From: Weddington, Eric
Subject: RE: [avr-gcc-list] cbr and negative numbers
Date: Fri, 12 Sep 2008 10:36:41 -0600


> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Gre7g Luterman
> Sent: Friday, September 12, 2008 9:19 AM
> To: address@hidden
> Subject: Re: [avr-gcc-list] cbr and negative numbers
> ----- Original Message ----
> From: Ruud Vlaming <address@hidden>
> To: address@hidden
> Sent: Friday, September 12, 2008 8:23:23 AM
> Subject: Re: [avr-gcc-list] cbr and negative numbers
> > So have a look at my OS for the AVR, sources included (GPLv3)
> > http://www.femtoos.org/
> > ;-)
> There's an OS for the AVR? Whoa. I had no idea. 

Section 6.1 of the WinAVR User Manual lists *several* open source operating 
systems! The user manual (web page) itself has links.


6.1 Operating Systems

While an Operating System, or RTOS, isn't necessary to write software for the 
AVR, there may be times when it is desirable. Below, are some links for free or 
open source operating systems / kernels for the AVR. Note that this may not be 
a complete list.


    AvrX is a Real-Time Multitasking Kernel.

EtherNut - Nut/OS

    Ethernut is an Open Source Hardware and Software Project for building 
Embedded Ethernet Devices. It contains Nut/OS which is an intentionally simple 
RTOS for the ATmega128, which provides a minimum of services to run Nut/Net, 
the TCP/IP stack.


    FreeRTOS is a portable, open source, mini Real Time Scheduler (or mini RTOS 


    TinyOS is a component-based runtime environment designed to provide support 
for deeply embedded systems which require concurrency intensive operations 
while constrained by minimal hardware resources.


    Contiki is an Internet-enabled operating system and desktop environment for 
a number of smallish systems.

XMK - eXtreme Minimal Kernel

    XMK is a preemptive multitasking scheduler/kernel for 8bit 
microcontrollers. Its goal is to provide a bare bones RTOS with a small enough 
footprint (RAM+ROM) to run on 8bit microcontrollers.

pico OS

    pico OS is a highly configurable and very fast real time operating system 
(RTOS). It targets a wide range of architectures, from very small 8 bit 
processors and microcontrollers up to very huge platforms. An AVR port is 


    uSmartX is a non-preemptive, multitasking, priority based RTOS. It features 
mechanisms for inter-task communication and basic task and time control 

Super Simple Tasker (SST)

    This is an implementation of a lightweight scheduler so called "Super 
Simple Tasker" - SST. The idea is taken from the Robert Ward's article - 
"Practical Real-Time Techniques" 
http://www.quantum-leaps.com/resources/Ward03.pdf. The SST allows to 
significantly reduce needs for precious RAM and ROM and still allows to keep a 
real time characteristic of the scheduler (e.g. tasks prioritization and 


    ChibiOS/RT is a compact and fast RTOS designed for embedded applications. 
It offers threads, mutexes, semaphores, messages, events, timers, flexible I/O 
with timeout capability.

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