Rate Monotonic Manager

[Gedare Bloom]

Which BSP do you use? (Send the 'configure' command line you use for RTEMS.)

On Wed, Oct 12, 2016 at 9:56 AM, Agostino Mascitti
<agostino.mascitti at student.univaq.it> wrote:
> Hi,
>
>
> I am sorry for delay. Just to answer Gerade, I am using the last version of
> RTEMS and BSP. To determine that it elapses after 2 secs, I just count with
> my hands the time between 2 consecutive printfs.
>
> Using a proportion I set the correct amount of microsecs per tick. But now I
> do not know how to explain it on my thesis work. It does not seem to me a
> good thing that I discovered it using a proportion. I attach the new file,
> which is correct.
>
>
> Agostino
>
> ________________________________
> Da: Sebastian Huber <sebastian.huber at embedded-brains.de>
> Inviato: martedì 11 ottobre 2016 07.08.29
> A: Gedare Bloom; Agostino Mascitti
> Cc: users at rtems.org
> Oggetto: Re: Rate Monotonic Manager
>
> I am not sure if clock ticks below 20Hz work. Better use
>
> #define CONFIGURE_MICROSECONDS_PER_TICK 10000
>
>
> On 11/10/16 02:44, Gedare Bloom wrote:
>> Nothing jumps out at me. The code at first glance looks correct. What
>> version of RTEMS and what BSP are you using? How do you determine that
>> 2 seconds elapse between periods? Can you attach a debugger and see
>> how the value of the _Watchdog_Ticks_since_boot is progressing?
>>
>> Gedare
>>
>> On Sun, Oct 9, 2016 at 11:56 AM, Agostino Mascitti
>> <agostino.mascitti at student.univaq.it> wrote:
>>> Dear all,
>>>
>>>
>>> I am trying to understand the Rate Monotonic Manager. I think I am not
>>> understanding something.
>>>
>>> As you can see in the attached file, I defined
>>>
>>> #define CONFIGURE_MICROSECONDS_PER_TICK     1000000 /* Every 1 sec a tick
>>> */
>>> and I would like a task to be executed every 4 seconds:
>>> rtems_rate_monotonic_period(periodid, 4);
>>> The strange thing is that the task is executed every 2 seconds.
>>>
>>> I read the user guide and, as I understand, in the first iteration of the
>>> while loop rtems_rate_monotonic_period should not block. In the second
>>> iteration, instead, it should block for 4 sec minus the time used to
>>> perform
>>> the periodic actions. When this time expires, the 4 seconds period should
>>> start another time.
>>>
>>> Could anybody say to me what I am not understanding well please?
>>>
>>> Thank you another time,
>>> Agostino
>>>
>>>
>>> _______________________________________________
>>> users mailing list
>>> users at rtems.org
>>> http://lists.rtems.org/mailman/listinfo/users
>> _______________________________________________
>> users mailing list
>> users at rtems.org
>> http://lists.rtems.org/mailman/listinfo/users
>
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-brains.de
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>
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>