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From: Zi Zhou <zzhou@3upsystems.com>
To: ecos-discuss@sources.redhat.com
Subject: [ECOS] How to change CYGNUM_HAL_RTC_PERIOD ?
Date: Tue, 21 Oct 2003 17:07:00 -0000	[thread overview]
Message-ID: <3F95696C.8080400@3upsystems.com> (raw)

Hi,

I am trying to understand eCos Real time clock, especially 
CYGNUM_HAL_RTC_PERIOD.  Is this the parameter that decides how many 
machine cycles each tick should have, in other words,  the machine cycle 
interval between timer interrupt? If my reference board is 100MHz and 
CYGNUM_HAL_RTC_PERIOD = 10^6,  is it safe to say with everything else 
the same, the processor runs at 133MHz, I should change 
CYGNUM_HAL_RTC_PERIOD  to 1.33 x 10^6 if I don't change RTC Numerator 
and Denominator?

thanks a lot !

Zi


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             reply	other threads:[~2003-10-21 17:07 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-10-21 17:07 Zi Zhou [this message]
2003-10-22 11:30 ` Nick Garnett

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