Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

NIOS + IRQ + custom component

Hi, I'm trying to interrupt a Nios Prosessor whit a Custom Component and setup a successful interrupt routine. But I can't Do it. The problem is that i can't find a complete example of a custo...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi Fightingdreamer,

Not sure if you are implementing the procedure correctly. Process I implemented was:

1. IRQ signal ( interrupt sender) is generated. This signal needs to have a period of typically 50 clocks wide (wrt Nios Clock).

2. The IRQ signal is used to simultaneously set an IRQ bit in an avalon MM register, i.e. Status reg within your custom component.

Process 1 alerts the NIOS to an interrupt event and points to the entry point of your ISR code.

The ISR code reads and clears the IRQ bit (set in Process 2) before exiting the ISR.

Hope this helps,

Ken.