Hello,
I try to manage irq on my digital I/O board rtdm driver.
So, I call rtdm_irq_request with RTDM_IRQTYPE_SHARED | RTDM_IRQTYPE_EDGE
option to define my irq handler, in my rtdm open function.
This irq handler works very good.
So, I try to establish a callback system to inform my sofware when an
valid interrupt is arrived.
I don't know callback system, so i establish a rtdm semaphore.
So, in my irq handler I call rtdm_sem_up, and I have an blocant ioctl
where I call only rtdm_sem_down.
To test this method, I write a test code, where I create a rt task by
calling rt_task_create(&Handler_IT_task, "Handler IT Task",0,50,0); and
rt_task_start(&Handler_IT_task, &Handler_IT_task_proc, NULL);
And my task procedure is :
void Handler_IT_task_proc (void * arg)
{
int ret;
while(1)
{
ret = rt_dev_ioctl(IO_Card_ID, DISCRETS_IOC_WAIT_IT, 0);
if (!ret)
printf("IT detected\n");
else
goto exit_Handler_IT_task;
//rt_task_suspend(&Handler_IT_task);
}
exit_Handler_IT_task:
printf("Exit Handler IT task\n");
}
My problem is that on IT reception, my work station freeze. But, if I
call a suspend task after my blocant ioctl (see comment), and I call an
task resume by a gets in my main function, all my interrupts are founded
correctly.
I try to change the rtdm semaphore by a rtdm event, but the results are
the same.
So, why my sofware is frozen when the Handler task procedure keep the
hand ? Can I establish a really callback function instead of a blocant
ioctl ?
Tanks.
Guillaume Dournes.
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