XDEF	Entry
	XREF	__SEG_END_SSTACK

Variables:		Section

Constants:	     Section
DDR_S	    equ	  	$24A
DDR_T	    equ   	$242
PORT_T      equ     $240
PORT_S      equ     $248

;starts high -> goes low -> goes high -> light on
;starts low -> goes high -> goes low -> goes high -> light on

Code:			Section
Entry:
            BSET    DDR_S,#$FF              ;set all bits of DDR_S as output
			BSET	DDR_T,#$00	            ;clear all bits of DDR_T (input)

            BSET    PORT_S,#$00             ;turn off all LED's

Check1:
            ;if switch starts low
            LDAA    #$00                    ;condition of switch started low
            BRCLR   PORT_T,#$01,AwaitHigh      ;enter the high wait loop (switch started low)

            ;if switch starts high
            LDAA    #$01                    ;condition of switch started high
                                            ;proceed to low check loop if started high

AwaitLow:                                     ;loop until bit 0 is set low
            BRSET   PORT_T,#$01,AwaitLow      ;repeats if bit 0 is high/on (stops looping if low)

AwaitHigh:                                     ;loop until bit 0 is set high
            BRCLR   PORT_T,#$01,AwaitHigh      ;repeats if bit 0 is low/off (stops looping if high)
            ANDA    #$01                    ;checks if the switch started high
            BEQ     AwaitLow                  ;if started low, wait for it to go high again

Out:
            BSET    PORT_S,#%01000000       ;turn on LED 6
            NOP