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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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Hi,

I guess you are using NIOS IDE/EDS 9.1 or higher?

My assumption is that you are using the ENHANCED Interrupt API which doesn't implement alt_irq_interruptible()/alt_irq_non_interruptible() anymore.

The only way I know (means not that there is not an other way) how to use the both functions, is to manually change ALT_ENHANCED_INTERRUPT_API_PRESENT in system.h to ALT_LEGACY_INTERRUPT_API_PRESENT. Every time you regenerate your BSP or syslib you have to change it again!

But that's just a workaround.

I had the same problems and then included the VIC as EIC in my design. You can use the VIC with ENHANCED API. But much better, the VIC can handle the interruptible stuff without changing your code. That means your ISRs are interruptible without a call to alt_irq_interruptible().

Disadvantage: Until the momen, I don't know how set the option that an IRQ is not interruptible.

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Well there should be a disvantage in using the LEGACY api..

How can i use the enhanced API? i dont find documentations of a simple "Hello world button" using IRQ