hardwere interrupt in assembly language

Thank you scott for code!

I will try to dig your code but it looks too complicated (too big) for me and i don&#39;t understand this linker script http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/sad.gif I can show you my code that I wrote for testing my Nios II custom made optical encoder perifery and that shows how mutch I lerned in coding( it&#39;s just basic steps in code writing for nios II procesor) I used this Altera debug client (learned form altera provided Lab exercises) to load in my Cyclone II dev.kit(for 150$) I also tried nios II IDE but I don&#39;t know how to compile it and how to make this assembly code (I suppose this linker script is needed there am i right? http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/unsure.gif )

here is my encoder perifery test code that works fine http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif And in this week I added Interupt pin (avalon slave with interupt vector) and I need some extremly simple code to test it.

.include "nios_macros.s"
.equ enkoder, 0x00001800
.equ LEDG, 0x00001820# Cyclone II dev.kit Green LEDS
.equ LEDR, 0x00001810# Cyclone II dev.kit RED LEDS
/*enkoder register addres:
0 Speed
4 Caunter 
8 Status*/
.global _start
_start:
    movia r2, enkoder
    movia r3, LEDR
    movia r5, LEDG
loop: 
    ldwio r6, 4(r2) #  Read Caunter register caunt value
    stbio r6, 0(r3)  #  Show caunter value by RED leds
    nop
    ldwio r6, 0(r2) //Read speed value 
    stbio r6, 0(r5) // show speed value by GREEN Leds
    nop 
    br loop #  infinit loop :)

Previously on AVR 8bit procesors I didn&#39;t use eny linker scripts I codes in siple assembly but there was lot of simple examples also about interupts http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif so I lerned wery fast, but now lerning Nios II is more dificult becose there are just few Lab exercises and they are incomplete (this first code I puted was from Lab exercise 4 and it is incomplete)