Minimum RTEMS system clock frequency

[Alexander Krutwig]

On 20/03/15 01:54, Chris Johns wrote:
>
> On 20/03/2015 11:27 am, Joel Sherrill wrote:
>>
>> 20 Hz is a 50 millisecond period.
>>
>
> Ah, thanks. I read it on a phone as 20KHz and was confused and did not 
> reread.
>
>> I have assumed that he meant this was the largest clock tick time 
>> quantum which is reasonable to configure.
20 Hz is supposed to be the slowest frequency the rtems_clock_tick() 
should be called.
>
> 50msec is fine with me even on a slow cpu clock speed.
>
>>
>> Why is that?
>>
At the moment, I think 20 Hz are needed to ensure a correct 
functionality of the 10 timehands structure. Further explanation
is given in the currently last comment of the ticket 
(https://devel.rtems.org/ticket/2271#comment:9).

> Also I wonder what the code size trade off is for small memory targets 
> compared to what we currently have ?
>
> Chris
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Alex

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