Niklaus Burren wrote:
> Hello
>
> I try to register an interrupt handler for an externel interrupt(GPIO
> 105) in a xenomai (2.2.2) kernel module on a ARM processor (PXA 270).
> I create a interrupt object with the rt_intr_create() function without
> an error. After that I enable the interrupt with rt_intr_enable(). When
> I run the kernel module on the PXA270 board and put a square signal to
> the GPIO 105 pin the interrupt handler is never called.
>
> // Interrupt Handler
> int int_handler(struct xnintr *intr)
> {
> printk("Interrupt detected\n");
> return RT_INTR_HANDLED;
> }
>
> ----
>
> // Enalbe Interrupt in init_module()
> err = rt_intr_create(&intr_desc, "GPIO_INT", 10, &int_handler, NULL, NULL);
>
> rt_intr_enable(&intr_desc);
>
> On PXA270 all externel interrupts on GPIO's have the same interrupt
> number (10). Is that a problem? When I get the pin status from the pin
> level register GPLR3 I can detect the square signal at the pin. But the
> interrupt handler function int_handler() is never called.
The I-pipe code demultiplexes the IRQ 10 and triggers handlers for irq
numbers after 34. The macro IRQ_GPIO, defined in
include/asm-arm/arch-pxa/irqs.h allow you to get the irq number
associated with a particular GPIO.
So, if you want to be notified of an interrupt on GPIO105, you should
register an handler for irq IRQ_GPIO(105).
--
Gilles Chanteperdrix
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