Nios II Classic Software Developer’s Handbook

ID 683282
Date 5/14/2015
Public
Document Table of Contents

14.1.34. alt_ic_irq_enabled()

Prototype

int alt_ic_irq_enabled (alt_u32 ic_id, alt_u32 irq)

Commonly Called By

C/C++ programs

Device drivers

Thread-safe

Yes.

Available from ISR

Yes.

Include

<sys/alt_irq.h>

Description

This function determines whether a specified interrupt is enabled.

The function arguments are as follows:

  • ic_id is the interrupt controller ID as defined in system.h, identifying the external interrupt controller in the daisy chain. This argument is ignored if the external interrupt controller interface is not implemented.
  • irq is the IRQ number, as defined in system.h, identifying the interrupt to enable.
  • A driver for an EIC must implement this function.

Return

Returns zero if the specified interrupt is disabled, and nonzero otherwise.