Rate Monotonic Manager

[Agostino Mascitti]

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
> _______________________________________________
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> users at rtems.org
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