Re: [Xenomai] freescale(imx53) with xenomai patch

[嵌入式工程师 <ericvic@163.com>]

Now ，I suddenly noticed,P and V operation must not be interrupted operation. Before I did not know my colleague spent rt_sem_p () and rt_sem_v ().
Today, I suddenly saw it.
I also would like to ask, rt_alarm_inquire is available in rt_sem_v () operation, timing counts?
Because they are in the case with a timer but also a very accurate timekeeping pv operation.
在 2013-06-03 19:46:17，"Gilles Chanteperdrix" <gilles.chanteperdrix@xenomai.org> 写道：
>On 06/03/2013 10:24 AM, 嵌入式工程师 wrote:
>
>> I have set the trigger type with Low trigger  and without disable and enable codes.
>> if the interrupt is triggered the hardware will set the gpio with High 。
>> It has the same problem.
>> I do not why ?
>
>
>Ok, could you tell me:
>- what type you set for your interrupt (with irq_set_irq_type)?
>- what is the shape of the signal?
>
>Sorry for stating the obvious, but if the gpio is toggled every
>500milliseconds and you set the irq type to level (low or high), the
>interrupts is considered to be asserted by the interrupt controller
>during 500 milliseconds, and so your interrupt handler is called
>continuously during 500 milliseconds. In that case, what you would be
>interested in would be to call:
> irq_set_irq_type(irq, IRQ_TYPE_EDGE_BOTH)
>for instance.
>
>Regards.
>
>-- 
>                                                                Gilles.