*-----------------------------------------------------------
* Title      : 
* Written by : Luigi Coppolino
* Date       :
* Description: While pushing a pushbutton the light goes around 
*               the led bank. 
*-----------------------------------------------------------
    ORG    $1000
START:                  ; first instruction of program

* Put program code here
    CLR.B     D1
    CLR     D2
    MOVEA.L #HEX,A0     ; A0 points to mapped hardware 
    MOVE.B  #0,LED(A0)  ; switch off all the leds
    
    CLR.L   D0              ; previous status
    MOVE.B  #1,D2   
    MOVE.B  D2,LED(A0)       
LOOP 
    MOVE.B  PUSH(A0),D1   ; current status
    CMP.B   #$FF,D1
    BEQ     LOOP    
    
LED_SWITCH
    ROR.B   #1,D2
    MOVE.B  D2,LED(A0)
    BRA     LOOP   
     
 
    
    SIMHALT             ; halt simulator

* Put variables and constants here
DISP EQU 0
LED EQU $10
SWITCH EQU $12
PUSH EQU $14

HEX EQU  $E00000

    END    START        ; last line of source



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