On 19/03/2015 8:06 pm, Alexander Krutwig wrote:
currently I am working on the implementation of FreeBSD timecounters
into RTEMS as illustrated in Ticket #2271 of the developer's board
(https://devel.rtems.org/ticket/2271).
This is really cool stuff and I think the graphs so far are excellent.
In the progress, I found out that the minimum RTEMS system clock
frequency should at least be 20Hz to guarantee a correct functionality.
Are there users that are troubled by this minimum system clock frequency?
I am a little confused with the wording here.
To me a 'system clock frequency' is the CPU clock or core clock or
something similar. Is this a frequency of the tick interrupt for RTEMS ?
If this is a tick frequency do you mean this is the maximum frequency ?
A period of 50usecs is too short for any system I know of so I can only
assume this is a maximum frequency and minimum period.
If this is a maximum frequency that seems ok with me. This is a system
timer and my experience is any high speed timing should use dedicated
timers tailored to the task, or example IEEE 1588 (PTP).
Chris
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