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Altera_Forum's avatar
Altera_Forum
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15 years ago

Interrupt priority IIR

Hi all, I'm using the NIOSII with an Internal Interrupt Controller (IIR) and 8 IRQ's triggered by PIO edges. I assigned a number to each one of the IRQs which represents it's priority where a l...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

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As far as i know alt_irq_interruptible() needs to be called together with alt_irq_non_interruptible() to bracket the code right?

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Exactly!

Maybe something like that 


static void ISR_TIMER(void* context, int id)
{
   int tempcontext;
   // optional: Do something which is not interruptible
   tempcontext= alt_irq_interruptible(id);
   // Do something which is interruptible
   alt_irq_non_interruptible(tempcontext);
}
If you call alt_irq_interruptible(id) with the IRQ-id of the ISR then only higher priority IRQs are able to interrupt.

Greets