Bernhard Kuhn ([EMAIL PROTECTED]) wrote:
> Zdenek Kabelac wrote:
>
> > When we've been searching some real-time OS, we have NOT find any with better than
> > 1 milisecond precision (for PC200MMX). With RT-linux we are able to schedule
> > task at 2500Hz with with schedulling times are between 400 - 460
> > microseconds - even on quite loaded system with IDE drive - however
> > than we have some problems with user tasks working with this driver)
>
> For a single periodic task with frequencies above 1KHz, i would say it
> is better to use the RTC, implementing the task as interrupt service
> routine. Will be more accurate and less time consuming (because scheduler
> is not used)
I would like to point out two things.
First, the RTC in PC can only be programmed to 2^N Hz frequencies
(2 Hz, 4 Hz, ... 32 kHz).
Second, I found that at least on some machines, there are problems with
periodicity of the RTC interrupts: the interrupt requests times deviate from
strictly periodical by up to 40 us.
Michael.
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