[riot-users] possible hwtimer bug

Aleksandr Mikoff sir.enmity at gmail.com
Sun Apr 14 13:47:57 CEST 2013

Currently i am testing RIOT on chronos and stm32f4discovery boards. Thank
you for your comments.
Finally i found the problem - i compile the code with DEBUG parameter, this
leads to printf lines inside thread_wakeup function, and that caused my
problem. Now, when i removed all printf code from this functions all works
Also some printf inside scheduler causes the same effect.

2013/4/14 Marco Ziegert <ziegert at inf.fu-berlin.de>

> Hello Aleksandr,
> as the name says hwtimer is hardware dependent - can you tell us which MCU
> you are using?
> If you are programming for the STM Cortex-M3/M4 - only 16-Bit Timer are
> implemented for hwtimer. 32-Bit Timer are very rare and may be used for
> more important tasks than waiting for longer periods. E.g. one 32-Bit Timer
> is temporarily used for hwtimer_now(). The longest period you can wait with
> a 16-Bit Timer are 54-56 seconds as far as I remember the implementation.
> For longer periods use the RTC alerts.
> Best regards,
> Marco Ziegert
> Am 14.04.2013 um 12:39 schrieb Aleksandr Mikoff <sir.enmity at gmail.com>:
> Dear developers and users,
> Today i discovered a very strange behaviour of scheduler. When i perform
> hwtimer_wait(x) function, where x - time to wait, if x < critical_value
> then the function is finished correctly, but if x>critical_value, then the
> function never wakes up. The critical_value varies and depends on time of
> excectuion of sched_set_status function.
> I have the following output from scheduler when the  function doesn`t
> wakes up:
> thread_wakeup: Trying to wakeup PID 1..
> status = 4875(or = 64)
> thread_wakeup: Thread is not sleeping!
> I tried to catch the function, which change the pid_status value, but
> nothing came out.
> Let me know, if you have any ideas, thank you.
> --
> Best regards,
> Aleksandr Mikov
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С уважением,
Миков Александр

RealTrac: пример применения разработанной нами технологии
http://www.rfidexpert.ru/ru/story/985 (rus, 13.09.2011)
http://www.rfidjournal.com/article/view/8600/1 (eng)

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