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Re: to consume cpu time
- From: Nick Garnett <nickg at ecoscentric dot com>
- To: Luca Formaggio <luca_formaggio at yahoo dot it>
- Cc: ecos-discuss at sources dot redhat dot com
- Date: 22 Oct 2003 11:17:25 +0100
- Subject: Re: [ECOS] to consume cpu time
- References: <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
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