Philippe,

Indeed it was a problem with __set_irq_handler() not assigning appropriate
handlers, since this board doesn't fall into any of the existing handler
categories.

Thanks for your help.

James


On Wed, Sep 16, 2009 at 10:47 AM, Philippe Gerum <rpm@xenomai.org> wrote:

> On Tue, 2009-09-15 at 10:27 -0500, James Kilts wrote:
> > I'm porting Xenomai/I-pipe to the NS921x (an arm9-based) platform, but
> > I'm having problems getting the interrupts to re-enable after the
> > first interrupt triggers.
> >
> > A kernel driver module is being used to test the interrupt latency
> > using an input GPIO pin which triggers a dedicated external IRQ, to
> > which the ISR responds by toggling a different GPIO pin.  I realize
> > that there are test applications which do very similar things, and
> > that the RTDM skin is preferable over the native API.  Still, I would
> > like to understand why the interrupt is not being properly
> > acknowledged and reset.
> >
> > If the ISR manually performs the ACK and EOI using platform specific
> > calls, subsequent interrupts are handled properly.  My understanding
> > was that Xenomai should re-enable the interrupt for processing without
> > such intervention.  How do I force Xenomai to clear and re-enable the
> > interrupt to handle subsequent interrupts?
>
> It looks like an I-pipe issue, not a Xenomai one. Xenomai asks the
> I-pipe to re-enable the interrupt line via the ipipe_end() handler, and
> for some reason, that handler does not seem to do the right thing on
> your board.
>
> Which I-pipe patch are you using (kernel version and I-pipe release)?
>
> >
> > Thanks,
> > James
> >
> >
> >
> > static int __init turnaround_irq_measure_init(void)
> > {
> >     ....
> >
> >     retval = rt_intr_create(&irq_response_desc,
> > "ns9xxx_measure_irq_rt_response",
> >                             TURNAROUND_INPUT_IRQ,
> > turnaround_irq_measure_response,
> >                             NULL, NULL);
> >
> >     if (retval == 0)  // 0 is success
> >     {
> >         set_irq_type(TURNAROUND_INPUT_IRQ, IRQ_TYPE_EDGE_FALLING);
> >         retval = rt_intr_enable(&irq_response_desc);
> >
> >         if (retval != 0)  // 0 is success
> >         {
> >             console_print("Turnaround test driver rt interrupt enable:
> > FAILED\n");
> >         }
> >     }
> >     else
> >     {
> >         console_print("Turnaround test driver rt interrupt create:
> > FAILED\n");
> >     }
> >
> >     return 0;
> > }
> >
> >
> > static int turnaround_irq_measure_response(struct xnintr *intr)
> > {
> >     /* Set GPIO pin low */
> >     gpio_set_value(TURNAROUND_OUTPUT_GPIO, 0);
> >
> >     /* Wait 50 microseconds */
> >     rt_timer_spin(50000);
> >
> >     /* Set GPIO pin high */
> >     gpio_set_value(TURNAROUND_OUTPUT_GPIO, 1);
> >
> >     /* Start listening again */
> >     /* NOTE:  These two lines should not be necessary */
> >     ns9xxx_ack_irq(TURNAROUND_INPUT_IRQ);
> >     ns9xxx_eoi_irq(TURNAROUND_INPUT_IRQ);
> >
> >     return RT_INTR_HANDLED;
> > }
> >
> >
> > _______________________________________________
> > Xenomai-help mailing list
> > Xenomai-help@domain.hid
> > https://mail.gna.org/listinfo/xenomai-help
> --
> Philippe.
>
>
>