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Re: Real Time Clock


On 17.12.2015 11:31, Privat wrote:
> Dear Ecos Developers and Maintainers,
>
> i have a question regarding the real time clock.
> I have a FreeSacle which runs at 116 Mhz, which means  i have 1 000 000
> 000  ns / 116 000 000  or 8ns per cycle.

Is it a Kinetis?

>
> I set the dividend to 1000, and the divisor to 116 which following the
> documentation (http://ecos.sourceware.org/docs-2.0/ref/kernel-clocks.html)
>  - should always yield the ratio of ns between clock ticks.
> Unfortunatly that does not result in correct values.
>
> Strange as it sounds, the default works near perfect.
> But reading the realtime clock resolution i got a dividend 1000000000
> and a divisor of 1000 - which would be correct for a 100 Hz processor.
>
> Any help or advice is welcome. I would also like to know, how the system
> is able to derive its own cyclerate.
>
> Regards Picasso
>


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