Altera Nios Ethernet Development Kit: "spurious interrupt number: 0000 001C"

Hi Colin,

Spurious interrupts occur when Nios is interrupted before a handler has been installed. Open the generated excalibur.h (under *_sdk/inc) and look the *_irq definition which is assigned 28. This will tell you what source is causing that interrupt. Why it's being generated is the question ... if it's an interrupt driven by I/O, it could be a floating pin or any number of things. Check the Quartus compile results to make sure all the pins are defined for starters.

To help debugging, or at least allow you to use the system until you find the problem, you can disable spurious interrupt trapping by double-clicking Nios in SOPC Builder, click the software tab, disable the option, and rebuild.

HTH,

-- Pete

Hi,

This has been discussed before:

Jesse Kempa Altera Corp. jkempa at altera dot com