New joystick driver contributed by Stefan Haubenthal

git-svn-id: svn://svn.cc65.org/cc65/trunk@2878 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/c64/Makefile

@@ -55,7 +55,7 @@ OBJS = 	_scrsize.o     	 	\
 
 EMDS = c64-georam.emd c64-ram.emd c64-ramcart.emd c64-reu.emd c64-vdc.emd
 
-JOYS = c64-hitjoy.joy c64-ptvjoy.joy c64-stdjoy.joy
+JOYS = c64-hitjoy.joy c64-numpad.joy c64-ptvjoy.joy c64-stdjoy.joy
 
 SERS = c64-swlink.ser
 

libsrc/c64/c64-numpad.s

@@ -0,0 +1,115 @@
+;
+; Joystick driver using C128 number pad in 64 mode.
+; May be used multiple times when linked to the statically application.
+;
+; Stefan Haubenthal, 2004-01-26
+; Based on Ullrich von Bassewitz, 2002-12-20
+;
+
+	.include	"zeropage.inc"
+
+	.include	"joy-kernel.inc"
+	.include	"joy-error.inc"
+	.include	"c64.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	"8"
+	.byte	$10			; JOY_DOWN	"2"
+	.byte	$20			; JOY_LEFT	"4"
+	.byte	$08			; JOY_RIGHT	"6"
+	.byte	$04			; JOY_FIRE	"5" ENTER
+	.byte	$00			; Future expansion
+	.byte	$00			; Future expansion
+	.byte	$00			; Future expansion
+
+; Jump table.
+
+	.word	INSTALL
+	.word	UNINSTALL
+	.word	COUNT
+	.word	READ
+
+; ------------------------------------------------------------------------
+; Constants
+
+JOY_COUNT	= 1		; Number of joysticks we support
+
+
+; ------------------------------------------------------------------------
+; Data.
+
+
+.code
+
+; ------------------------------------------------------------------------
+; INSTALL routine. Is called after the driver is loaded into memory. If
+; possible, check if the hardware is present and determine the amount of
+; memory available.
+; Must return an JOY_ERR_xx code in a/x.
+;
+
+INSTALL:
+	lda	VIC_CLK_128
+	cmp	#$FF
+	bne	@C128
+	lda	#JOY_ERR_NO_DEVICE
+	.byte	$2C
+@C128:	lda	#JOY_ERR_OK
+	ldx	#0
+
+;	rts			; Run into UNINSTALL instead
+
+; ------------------------------------------------------------------------
+; UNINSTALL routine. Is called before the driver is removed from memory.
+; Can do cleanup or whatever. Must not return anything.
+;
+
+UNINSTALL:
+	rts
+
+
+; ------------------------------------------------------------------------
+; COUNT: Return the total number of available joysticks in a/x.
+;
+
+COUNT:  lda	#JOY_COUNT
+	ldx	#0
+	rts
+
+; ------------------------------------------------------------------------
+; READ: Read a particular joystick passed in A.
+;
+
+READ:	tax			; Clear high byte
+	lda	#$FD
+	ldy	#$FE
+	sei
+	sta	VIC_KBD_128
+	lda	CIA1_PRB
+	and	#%00110000
+	eor	#%00110000
+	lsr
+	lsr
+	sty	VIC_KBD_128
+	eor	CIA1_PRB
+	iny
+	sty	VIC_KBD_128	; Reset to $FF
+	cli
+	and	#%11111110
+	eor	#%11111110
+	rts
+