Hi Veeru,
Thanks for you reply. Yes, that can be a reason, but in my case it is not.
When that problem happened I didn't run any application relates to DSPLink
on DM355 board.
And with cat /proc/interrupts, GPIO6 interrupt is numbered 50 (We can also
find this from DM355's docs). Oh, this interrupt number is also used for
EDMA_CC_ERROR, but I disabled it by commenting the call to request_irq
(EDMA_CC_ERROR_INT,...) in arch/arm/mach-davinci/dma.c. And I tried to run
loadmodules.sh, which inserts cmemk.ko and dm350mmap.ko, and then with cat
/proc/interrupts I saw a new interrupt number registered:
9: 1363 seq_arm_interrupt
so, the GPIO6 uses its own interrupt.
One more thing: Now, I try to build the driver as a module. After booting the
board, I insert that module, then, after 3 minutes, the same problem happens. I
rmmod and the insmod again, and it works well. Still don't know why, but
perhaps it relates to request_irq(). I am still finding.
Thank you,
Viet Hoang.
--- On Fri, 23/5/08, Veeranna <[EMAIL PROTECTED]> wrote:
> From: Veeranna <[EMAIL PROTECTED]>
> Subject: RE:DM355 - Using GPIO pin for interrupt: Strange problem
> To: [email protected]
> Date: Friday, 23 May, 2008, 4:09 PM
> HI
>
> Please make sure that what ever interrupt and Event number
> you r using is not used by others( DSPLINK uses some of
> the interrupts ).
>
> We also faced same problem On DM6446, we are using GPIO3
> pin with Hardware Int5, Event 67. We also observed that
> interrupt signal is operating( in IER and IFR reg), but
> Interrupt Service Routine is not getting called. From docs
> we came to know that DSPLINK is using INT5. So when
> interrupt occurs on INT5 it will DSPLINK's ISR , not
> users. we changed Interrupt No. to INT10 its working fine.
> So you also needs check out whether your system using same
> inteerupt for its own purpose. Try by changing Interrupt
> Number.
>
>
> Thank you,
> Veeru
>
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