Error on Request interrupt on AT91SAM9260-EK

- J
- João Paulo Bodanese
  
  Contact options for registered users
posted
15 years ago

Tue, Mar 3, 2009 12:58 PM

Hi,

I am trying to request an interrupt on IRQ 63, but when i load the module i got the message:

setting trigger mode 2 for irq 63 failed (gpio_irq_type+0x0/0x2c) IRQ 63 is not free.

The code is:

if (request_irq(gpio_to_irq (AT91_PIN_PA31),interrupt_count,IRQF_TRIGGER_FALLING,"Reset_Fabrica",NULL)) { printk(KERN_WARNING "IRQ %d is not free.\n", AT91_PIN_PA31); return -EBUSY; }

Actually, any IRQ i try to request i got the message that the IRQ isn't free.

# cat /proc/interrupts CPU0

1: 103537 AIC at91_tick, rtc0, ttyS0 9: 11 AIC mmc0 10: 0 AIC at91_udc 13: 15 AIC atmel_spi.1 14: 0 AIC at73c213 20: 0 AIC ohci_hcd:usb1 21: 1795 AIC eth0 62: 1 GPIO Button 3 101: 1 GPIO at91_udc Err: 0

Any ideia?

Regards

- N
- Not Really Me
  
  Contact options for registered users
Vote on answer
posted
15 years ago

Tue, Mar 3, 2009 3:43 PM

I must be missing something here. The AIC in the SAM9260 only has 32 interrupts. Are you using a linix implementation that supports a software interrupt mechanism?

--
Scott
Validated Software
Lafayette, CO

- B
- Boudewijn Dijkstra
  
  Contact options for registered users
Vote on answer
posted
15 years ago

Mon, Mar 9, 2009 11:06 AM

Commonly, each individual GPIO pin interrupt is assigned a virtual interrupt numbers cascaded from the GPIO block interrupt handler.

I guess that gpio_to_irq() converts the virtual interrupt number into the GPIO block interrupt number, which is not free (duh). Besides that, it would only make sense to set a trigger mode on a GPIO interrupt if the GPIO interrupt handler implements a mode filter in software, because the hardware doesn't support mode setting on individual GPIO pins.

--
Gemaakt met Opera's revolutionaire e-mailprogramma:  
http://www.opera.com/mail/