[En-Nut-Discussion] GPIO Level change IRQ problem on SAM7

[Mark vd Waal van Dijk]

Hi Ole,

I have had similar problems with edge triggered input interrupt. Mine were
caused by the spurious interrupt not being handled. The interrupt controller
doesn't get an acknowledge for this interrupt and is "stuck". I don't know
if Nut/OS does anything with the spurious interrupt? You could try to make
an ISR for the spurious vector and let this acknowledge the interrupt.

Regards, Mark 


Ole Reinhardt-2 wrote:
> 
> Hi all,
> 
> I just encountered a problem with the GPIO level change interrupt. I use
> the IRQ pin to track an RFID signal. Therefore I get level change
> interrupts quite fast.
> 
> After a short time the interrupt generation now stops.
> 
> I could avoid the problem when initalizing the sig_PIOB as level
> sensitive instead of edge sensitive.
> 
> Had anyone else similar problems before? I remember we just had the same
> problem with the USART interrupt on some AT91 derivates.
> 
> Most of the interrupt handlers are triggered edge sensitive in NutOS
> perhaps we should check again every single case if edge or level
> sensitive triggering would be better.
> 
> Regards,
> 
> Ole Reinhardt
> 
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