From: Nick Garnett <nickg@ecoscentric.com>
To: Luca Formaggio <luca_formaggio@yahoo.it>
Cc: ecos-discuss@sources.redhat.com
Subject: Re: [ECOS] to consume cpu time
Date: Wed, 22 Oct 2003 11:30:00 -0000 [thread overview]
Message-ID: <m3ptgp37be.fsf@miso.calivar.com> (raw)
In-Reply-To: <20031022084056.7297.qmail@web41402.mail.yahoo.com>
Luca Formaggio <luca_formaggio@yahoo.it> writes:
> Hi. I need to consume a cpu time in a program. This
> time is in nanoseconds. Is there a ecos function that
> consume time in nanoseconds? If it exists, how I call
> this function from my program?
There's nothing in eCos that can handle that. The best we have is
HAL_DELAY_US() which approximates a given microsecond delay.
If you want to insert delays for sub-microsecond periods then the best
approach is probably to use timed code loops. Even then, your timing
is going to be thrown out by any interupts. Even cache misses or DRAM
refresh cycles may affect you.
--
Nick Garnett eCos Kernel Architect
http://www.ecoscentric.com The eCos and RedBoot experts
--
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss
next prev parent reply other threads:[~2003-10-22 11:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-22 8:40 Luca Formaggio
2003-10-22 11:30 ` Nick Garnett [this message]
2003-10-22 21:02 Doug Fraser
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