why don't you try some state machines?

On Mon, May 18, 2009 at 6:32 AM, Tamas Rudnai <tamas.rudnai@gmail.com>wrote:

> On Mon, May 18, 2009 at 9:05 AM, Jan-Erik Soderholm <
> jan-erik.soderholm@telia.com> wrote:
>
> > Besides, even an RTOS can't do more than one thing "at once"...
> >
>
> Of course, you have one core anyway. But it could help you to think as
> threads were running parallel. It is just a different abstraction to
> interrupts or polling methods on a non rtos system.
>
> Like an event driven rtos 'thinks' that a change on a pin is an event when
> a
> process has to be triggered to run. On a cooperative rtos the thread waits
> for the pin change and till the thread is suspended. On a preemptive you
> can
> poll the pin without suspending the thread (and the entire mcu) -- all of
> them are doing the same basically with different way of thinking (and of
> course of different overhead on it). One could help to approach a specific
> problem better, the other one fits worse/better to many other related
> functions. But of course there is no rtos that makes you possible to write
> a
> firmware that was impossible on the bare silicon.
>
> Tamas
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