How to write HAL ISRs for custom components

[Altera_Forum]

Hi experts, 

 I created a custom component in the Component Editor and added it in a system containing only the Nios II and the component. I can write data from the Nios to my component; this is working. Now I want my component to interrupt the CPU so that it reads from the component.  How can I access the Nios registers containing the information about interrupts? I read in Ch. 5 of the Nios SW Handbook about developing HAL drivers but couldnt get any information on how to register an interrupt.  Any help or hints would be appreciated...  Thanks in advance!

[Altera_Forum]

Hello, 

 I also encounter problems with hardware custom components interrupts. Could someone help us ?  Thanks ! Regards.

[Altera_Forum]

Basically, to register your ISR you do 

 alt_irq_init // enable irqs in control register 3 (nios proc ref book, chapter 3)  alt_irq_register // tie your ISR  alt_irq_enable // enable your IRQ   That should work.  __________  If you want to access CPU registers, you can use functions like:  alt_irq_pending (or NIOS2_READ_IPENDING),  alt_irq_enabled, alt_irq_enable, alt_irq_disable etc   Check the alt_irq.h for the reference.   Good luck