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Altera_Forum
Honored Contributor I
779 Views

Hardware Interrupt

Hello everyone, 

i have a simple question but i am a beginner and after searching the web for a day an reading nearly all nios documentations i decided to use a Forum. I hope someone can help me. 

Can someone tell me how to initialise a hardware interrupt in assembler? I Tried many things with no result and i just want to programm a counter which counts +1 evry time i press key0 and reset when i press key3 with an interrupt bur nothing works. 

(Cyclone II) 

 

hope someone can help me and sry for the bad english
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Altera_Forum
Honored Contributor I
52 Views

i have a code example. 

it nearly works, It jumps in the IRS but dont know wicht key were pushed dont know why :-/ 

 

 

.equ STACK_SIZE, 0x400# stack size .equ PUSHBUTTON_BASE, 0x10000050 .data TST_PAK1: .word 0x11112222# test data STACK_END: .word 0xFFFFFFFF# end of stack .skip STACK_SIZE# stack area filled with 0 # ############################################# # Exception# # # # # # ############################################# .section .exceptions, "ax" # Fixierung der Routine subi sp, sp, 4 # Stacksicherung stw r13, (sp) subi sp, sp, 4 stw r4, (sp) subi sp, sp, 4 stw r3, (sp) ISR: movia r5, 0x810 rdctl et, ctl4 # Überprüfung auf Interrupt beq et, r0, SKIP # Interrupt ist weg, raus aus der Exception subi ea, ea, 4 # PC Anpassung andi r13, et, 0b1000 bne r13, r0, IRQ1_ISR# Test ob es IRQ1 aktiv ist andi r13, et, 0b0010 bne r13, r0, IRQ3_ISR# Test ob es IRQ3 aktiv ist br SKIP IRQ1_ISR: # Erste Taste gedrückt movia r4, 15 stw r4, (r5) br SKIP IRQ3_ISR: # Vierte Taste gedrückt stw r0, (r5) movia r3, 15 SKIP: # Springt zum Ende der interrupt-service routine ldw r3, (sp) addi sp, sp, 4 ldw r4,(sp) addi sp, sp, 4 ldw r13, (sp) addi sp, sp, 4 eret # Raus aus der Exception # ############################################## # End Exception # # # # ############################################## # ############################################## # TEXT SECTION # Executable code follows # ############################################## .global _start .text _start: movia sp, STACK_END # load data section's start address addi sp, sp, STACK_SIZE # stack start position should # begin at end of section subi sp, sp, 4 stw r15, (sp) subi sp, sp, 4 stw r16, (sp) movi r16, 0x10# Interrupt starten movi r15, 1 wrctl ctl3, r16 wrctl ctl0, r15 # Taster Interrupts aktivieren movia r16, 0x0840 movi r15, 0x9# Maske für die Interrupts 1001 => 0x9 stw r15, 8(r16)# Maske in der Adresse von Tastern reinschreiben um Interrupts aktivieren ldw r16, (sp) # Stack addi sp, sp, 4 ldw r15, (sp) addi sp, sp, 4 br endloop endloop: br endloop # that's it .end
Altera_Forum
Honored Contributor I
52 Views

Typically with keyboard interrupts you read some registers of the keyboard to figure out which key was pressed. If you are not doing that then you would need to add that to your ISR. 

 

This might be easier if you wrote your code in C.... just saying :)
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