standard joystick driver for GEOS

git-svn-id: svn://svn.cc65.org/cc65/trunk@1847 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/Makefile

@@ -207,6 +207,7 @@ geoslib:
 	    done \
 	done
 	cp geos/devel/*.emd .
+	cp geos/devel/*.joy .
 
 #-----------------------------------------------------------------------------
 # CBM PET machines

libsrc/geos/devel/Makefile

@@ -23,7 +23,7 @@ S_OBJS	= crt0.o oserror.o oserrlist.o randomize.o fio_module.o
 
 EMDS = geos-vdc.emd
 
-JOYS =
+JOYS = geos-stdjoy.joy
 
 TGIS =
 

libsrc/geos/devel/geos-stdjoy.s

@@ -0,0 +1,124 @@
+;
+; Standard joystick driver for the C64
+;
+; Ullrich von Bassewitz, 2002-12-20
+;
+
+	.include 	"zeropage.inc"
+
+      	.include 	"joy-kernel.inc"
+        .include        "joy-error.inc"
+	.include	"../inc/geossym.inc"
+
+        .macpack        generic
+
+
+; ------------------------------------------------------------------------
+; Header. Includes jump table
+
+.segment        "JUMPTABLE"
+
+; Driver signature
+
+        .byte   $6A, $6F, $79		; "joy"
+        .byte   $00                     ; Driver API version number
+
+; Button state masks (8 values)
+
+        .byte   $01                     ; JOY_UP
+        .byte   $02                     ; JOY_DOWN
+        .byte   $04                     ; JOY_LEFT
+        .byte   $08                     ; JOY_RIGHT
+        .byte   $10                     ; JOY_FIRE
+        .byte   $00                     ; Future expansion
+        .byte   $00                     ; Future expansion
+        .byte   $00                     ; Future expansion
+
+; Jump table.
+
+        .word   INSTALL
+        .word   DEINSTALL
+        .word   COUNT
+        .word   READ
+
+; ------------------------------------------------------------------------
+; Constants
+
+JOY_COUNT       = 2             ; 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     #<JOY_ERR_OK
+        ldx     #>JOY_ERR_OK
+
+;	rts                     ; Run into DEINSTALL instead
+
+; ------------------------------------------------------------------------
+; DEINSTALL routine. Is called before the driver is removed from memory.
+; Can do cleanup or whatever. Must not return anything.
+;
+
+DEINSTALL:
+        rts
+
+
+; ------------------------------------------------------------------------
+; COUNT: Return the total number of available joysticks in a/x.
+;
+
+COUNT:
+        lda     #<JOY_COUNT
+        ldx     #>JOY_COUNT
+        rts
+
+; ------------------------------------------------------------------------
+; READ: Read a particular joystick passed in A.
+;
+
+READ:	php
+     	sei			; disable IRQ
+	lda	$01
+	pha
+	lda	#$35
+	sta	$01		; enable I/O
+
+	tax			; Joystick number into X
+	bne    	joy2
+
+; Read joystick 1
+
+joy1:	
+	lda	#$7F
+     	sta	cia1base
+     	lda	cia1base+1
+back:	tax
+	pla
+	sta	$01
+	plp
+	txa
+     	and	#$1F
+     	eor	#$1F
+	ldx	#0
+     	rts
+
+; Read joystick 2
+
+joy2:	lda	#$E0
+	ldy	#$FF
+	sta	cia1base+2
+	lda	cia1base+1
+	sty	cia1base+2
+	jmp	back