In SX Microcontrollers, SX/B Compiler and SX-Key Tool, yllawwally wrote:

Here is the code, I stripped out everything but the code to test for buttons x,y, and z.
Attached is a description of the interface for 6 button sega controllers, in text format.





[code]

;-------------------------- DEVICE DIRECTIVES --------------------------

		DEVICE		SX28,OSC4MHZ,TURBO

IFDEF	__SASM  ;SASM Directives
		DEVICE		STACKX,OPTIONX
		IRC_CAL		IRC_SLOW
		
ELSE		;Parallax Assember Directives
		DEVICE		STACKX_OPTIONX
ENDIF

		RESET		Initialize

;---------------------------- DEBUG SETTINGS ---------------------------

		FREQ	4_000_000
	
;------------------------ INITIALIZATION ROUTINE -----------------------


Initialize




		;Port Direction Configuration at 4mhz each clock is 4.25u sec
		Timer	= $10
		GenXYZ	EQU	24
		Joystick_Mid	equ	$0E	;XXX,XXX,XXX,XXX,XXX,X,Y,Z
		Joystick_Low	equ	$0D	;XXX,C Button,XXX,B Button,Right,Left,Down,Up
		Joystick_High	equ	$0F	;XXX,XXX,XXX,A Button,B Button, X Button, Y Button, Z Button
		Joystick_M_wip  equ	$1E	
		Joystick_L_wip  equ	$1D	
		Joystick_H_wip  equ	$1F
		mov	W,#$1F			;Allow Direction configuration
		mov	M,W
		mov	!rb,#%11111111		;Set port B bits 0-7 to input
		mov	!ra,#%00000000		;Set port A bits 0-7 output bit 0 is select
		mov	!rc,#%00000000		;Set port C bits 0-7 output
		clrb	ra.0			;turn select off


;------------------------
Pause MACRO
		mov	Timer, #18 ;1 cycle

:Loop
		decsz 	Timer  ;2 cycles or 4 cycles
		jmp	:Loop   ;3 cycles
ENDM
;------------------------

bp0			


		pause  



		setb	ra.0		;turn select off, setting voltage to 5


		pause  



		clrb	ra.0		;turn select on, setting voltage to 0

		nop



		setb	ra.0		;turn select off, setting voltage to 5

		nop



		clrb	ra.0		;turn select on, setting voltage to 0

		nop




		setb	ra.0		;turn select off, setting voltage to 5

		nop




		clrb	ra.0		;turn select on, setting voltage to 0


		nop




;------------------- should be select on data now

		mov 	w, rb
		mov     Joystick_Mid, w


		jnb	rb.0, light	;check first bit, which should be button z
		jmp	nolight
light:		clrb	rc.6	;turn off led
		jmp 	bp0
nolight:	setb	rc.6	;turn on led


		setb	ra.0		;turn select off, setting voltage to 5

		nop




		clrb	ra.0		;turn select on, setting voltage to 0


		nop

		jmp 	bp0
;-----------------------------

;---------------------------- MAIN PROGRAM -----------------------------

Main		
		jmp	bp0
[/code]

---------- End of Message ----------


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