CODEWITHSUNDEEP
assemblyinterrupt-handling68000easy68k
Simon temp
Simon temp

Reputation: 1

Problem Showing Interrupt message on Easy68k

I'm trying to do a program for the 68k processor using assembly. And I'm using Easy68k

The main Idea of the program is that a message appears when the reset button is hit along with change in the seven segment.

And another message appears when the level 7 button is hit.

The reset message appears and works perfect, but hitting the level 7 interrupt button doesn't seem to do anything.

Can you please help me find the problem?

Here's the code:

 ORG    $0
    DC.L $00FFFFF0
    DC.L $00000500
    
    ORG $07C
    DC.L $2000
    
    ORG $500
    MOVEA.L #$E00000, A3
    MOVE.L #0, D1
    LEA SEVEN_SEG_CODE, A2
    
    MOVE #13, D0
    LEA START_TEXT, A1
    TRAP #15
    
    BRA START
    
    
    ORG $2000
LEVEL_7_INTERRUPT:
    MOVE    #13, D0
    LEA TEXT1, A1
    TRAP #15
    MOVE #3, D0
    TRAP #15
    BSR DELAY
    MOVE #13, D0
    LEA TEXT2, A1
    TRAP #15
    BSR DELAY
    MOVE.B $E00012, $E00010
    MOVE.B (A2, D1), (A3)
    ADDA.L #2, A3
    BSR DELAY
    ADD.L #1, D1
    RTE
    
    
DELAY:  MOVE.L #1000000, D5
LOOP2:  SUB.L #1, D5
        BNE LOOP2
        RTS
       
       
START_TEXT: DC.B 'WELCOME HARDWARE RESET',$0D,$0A, 0
TEXT1: DC.B 'WELCOME TL7',$0A,$0D, 0
TEXT2: DC.B 'ANOTHER WELCOME TL7',$0A,$0A, 0
SEVEN_SEG_CODE: DC.B %00000000, %11111111, %00000000, %11111111, %00000000, %11111111, %00000000, %11111111, %00000000, %11111111

        ORG $1000

START:                  ; first instruction of program

* Put program code here
        MOVE.L #0, D6
LOOP:   ADD.L #1, D6
        BSR DELAY
        BRA LOOP
    SIMHALT             ; halt simulator

* Put variables and constants here

    END    START        ; last line of source

Upvotes: 0

Views: 457

Answers (1)

tofro
tofro

Reputation: 6063

Your program seems to be (sortof) correct and works fine in my installation, at least for the first few Level 7 interrupts.

Have you enabled exception processing in "Options"->"Enable Exceptions"?

You shouldn't do anything time-intensive in ISRs - That's consdered bad practice in interupt service routines. Especially the "JSR DELAY" calls seem dangerous. Common practice is to set a variable inside the ISR and act on it in the main loop.

Upvotes: 2

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