[Xenomai-help] interrupt wait problem

[Xenomai-help] interrupt wait problem

[marcellin]

Hi, i'm trying to use the RealTimeClock IRQ 8, with a xenomai real time 
task. I configure the RTC to have a periodic interrupt on it with the 
linux standard API, and it works. After when i want to catch the IRQ 8 
in a xenomai real time task i have a problem a error ( " Operation not 
permitted ") with the " rt_intr_wait " fonction. Is there a special 
initialisation or configuration to make with the kernel or Xenomai ?


my conf : kernel 2.6.15.1 , Xenomai-2.1-rc4

in my program

//initialisation
             err = rt_intr_create(&intr_desc,"IRQ8",IRQ8,I_PROPAGATE);
             if(err){
           printf("AcqProcess -> failed to create interupt object : 
%s",strerror(-err));
       }
                  err = rt_intr_enable(&intr_desc);
             if(err){
           printf("AcqProcess -> failed to enable interupt object : 
%s",strerror(-err));
       }
             err = 
rt_task_create(&time_task,"SecondTask",TASK_STKSZ,TASK_PRIO,T_FPU|T_JOINABLE); 

       if(err){
           printf("AcqProcess -> failed to create task : 
%s",strerror(-err));
       }
              rt_task_start(&time_task,&timer_handler_thread,NULL);






//in the irq task


err = rt_intr_wait( &intr_desc,TIMEOUT );
                     if(err){
           printf("AcqProcess -> failed to wait interrupt : 
%s",strerror(-err));
       }


regards

Marcell1

Re: [Xenomai-help] interrupt wait problem

[Dmitry Adamushko]

On 14/03/06, marcellin <marcellin.fotze@domain.hid> wrote:

>
> //in the irq task
>
>
> err = rt_intr_wait( &intr_desc,TIMEOUT );
>                      if(err){
>            printf("AcqProcess -> failed to wait interrupt :
> %s",strerror(-err));
>        }

On success, rt_intr_wait() returns a positive value equal to a number
of currently pending interrupts and not 0.

Although, I don't know how e.g. 1 would be interpreted as "an
operation not permited" with strerror(). strerror(-1) should have
given an "unknown error" or smth like this.

Anyway, please take a look at what exactly the return value is :
negative or positive.


>
> regards
>
> Marcell1

--
Best regards,
Dmitry Adamushko

Re: [Xenomai-help] interrupt wait problem

[Gilles Chanteperdrix]

marcellin wrote:
 > 
 > 
 > Hi, i'm trying to use the RealTimeClock IRQ 8, with a xenomai real time 
 > task. I configure the RTC to have a periodic interrupt on it with the 
 > linux standard API, and it works. After when i want to catch the IRQ 8 
 > in a xenomai real time task i have a problem a error ( " Operation not 
 > permitted ") with the " rt_intr_wait " fonction. Is there a special 
 > initialisation or configuration to make with the kernel or Xenomai ?

As mentioned by Jan, rt_intr_wait() and generally every service which
block its caller may only be called from a real-time task, i.e. a task
created with rt_task_create() or made real-time with rt_task_shadow().

Also note that Xenomai system timer allow high frequency periodic
tasks without resorting to the RTC, see rt_task_set_periodic() and
rt_task_wait_period() services.

-- 


					    Gilles Chanteperdrix.