Ignore: Re: Microseconds per tick

[Thomas Doerfler]

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Leonard,

ups, obviously  I was completely on the wrong track. Please forget my
previous answer..

Time for the weekend :-(

Thomas.


Thomas Doerfler wrote:
> Leonard,
> 
> obviously you are a bit confused by the term "tick". In this
> configuration option, a "tick" is the interval between two increments of
> the RTEMS-maintained system time.
> 
> What you are refering to is the (similar, but different) option
> 
> CONFIGURE_CLICKS_PER_MICROSECOND
> 
> which defines, how often the HW timer (which generates the system tick
> interrupts) is increment per microseconds.
> 
> Without knowing the LEON, I would say that if the HW timer is
> incremented with 80MHz, you should set CONFIGURE_CLICKS_PER_MICROSECOND
> to 80.
> 
> And you might set CONFIGURE_MICROSECONDS_PER_TICK to 1000 to get a
> system tick/time granularity of 1000us = 1ms.
> 
> wkr,
> Thomas.
> 
> 
> Leonard Bise wrote:
>> Hi all,
> 
>> I'm quite new to RTEMS and I'm not very experienced so I hope you can
>> give me an hand!
> 
>> We are working with a board using a LEON2 Sparc processor running at
>> 80Mhz, I figured that the microseconds per tick value would be 0.0125
>> (is this correct?).
> 
>> Shall I simply configure my application with this define ? #define
>> CONFIGURE_MICROSECONDS_PER_TICK 0.0125 ?
> 
>> I hope you can help, thanks in advance.
> 
>> Léonard.
> 
>> ps: By the way I posted once using the wrong mail address and it said it
>> was awaiting approval from the moderators, please delete this one. This
>> is the correct address.
> 
> 
>> ------------------------------------------------------------------------
> 
>> _______________________________________________
>> rtems-users mailing list
>> rtems-users at rtems.com
>> http://rtems.rtems.org/mailman/listinfo/rtems-users
> 
> 
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IMD Ingenieurbuero fuer Microcomputertechnik
Thomas Doerfler           Herbststrasse 8
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