;
; MultiJoy joystick driver for the Atari. May be used multiple times when linked
; to the statically application.
;
; Ullrich von Bassewitz, 2002-12-21
; Stefan Haubenthal, 2009-04-10
; Using code from Carsten Strotmann and help from Christian Groessler
;

	.include	"zeropage.inc"

	.include	"joy-kernel.inc"
	.include	"joy-error.inc"
	.include	"atari.inc"

	.macpack	generic


; ------------------------------------------------------------------------
; Header. Includes jump table

.segment	"JUMPTABLE"

; Driver signature

	.byte	$6A, $6F, $79		; "joy"
	.byte	JOY_API_VERSION		; Driver API version number

; Button state masks (8 values)

	.byte	$02			; JOY_UP
	.byte	$04			; JOY_DOWN
	.byte	$08			; JOY_LEFT
	.byte	$10			; JOY_RIGHT
	.byte	$01			; JOY_FIRE
	.byte	$00			; JOY_FIRE2 not available
	.byte	$00			; Future expansion
	.byte	$00			; Future expansion

; Jump table.

	.addr	INSTALL
	.addr	UNINSTALL
	.addr	COUNT
	.addr	READJOY
	.addr	0			; IRQ entry not used

; ------------------------------------------------------------------------
; Constants

JOY_COUNT	= 8		; Number of joysticks we support


; ------------------------------------------------------------------------
; Data.


.code

; ------------------------------------------------------------------------
; INSTALL routine. Is called after the driver is loaded into memory. If
; possible, check if the hardware is present and determine the amount of
; memory available.
; Must return an JOY_ERR_xx code in a/x.
;

INSTALL:
	lda	#$30
	sta	PACTL
	lda	#$F0
	sta	PORTA
	lda	#$34
	sta	PACTL
	lda	#JOY_ERR_OK
	ldx	#0
;	rts			; Run into UNINSTALL instead

; ------------------------------------------------------------------------
; UNINSTALL routine. Is called before the driver is removed from memory.
; Can do cleanup or whatever. Must not return anything.
;

UNINSTALL:
	rts


; ------------------------------------------------------------------------
; COUNT: Return the total number of available joysticks in a/x.
;

COUNT:
	lda	#JOY_COUNT
	ldx	#0
	rts

; ------------------------------------------------------------------------
; READ: Read a particular joystick passed in A.
;

READJOY:
	asl	a
	asl	a
	asl	a
	asl	a
	sta	PORTA

; Read joystick

	lda	PORTA		; get position
	and	#%00001111
	asl	a
	ora	TRIG0		; add button information
	eor	#%00011111
	ldx	#0		; fix X
	rts