[TriEmbed] RTOS discussion/favorites

[Charles West]

Hello,

Real time operating systems can make some of the more complicated embedded
software tasks a lot simpler.  From what I've seen, it makes it a lot more
like threaded POSIX programming (with mutexes, semaphores, signals, etc).
Given their utility, I was wondering if people might be willing to share
their experiences with different RTOS implementations and what they thought
about the overall quality of different projects.

To start:
I've recently worked with FreeRTOS on some projects.  It is open source and
seems reasonably popular.  It worked pretty well for my project (however,
make sure that you set the interrupt priority of any interrupts that call
FreeRTOS functions to be less than that of the scheduler or the system will
be unstable).

Once the interrupt priorities were correct, it delivered on its guarantees
and worked well.  It is supported on many different microcontrollers, but
sometimes only for specific IDEs/compilers.  Its main downside is that it
appears to be somewhat difficult to port to a new platform ("non-trivial"
as it says in the docs).

I would love to have one RTOS that I can port and use across most
platforms.  The Atom Threads RTOS looks interesting since it says it is
"Highly portable ANSI C code not tied to any compiler", but I haven't tried
it yet.




Thanks,
Charlie West
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