Converted the VIC20 joystick to a loadable module

git-svn-id: svn://svn.cc65.org/cc65/trunk@1807 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/Makefile

@@ -92,6 +92,7 @@ vic20lib:
 	    $(AR) a vic20.lib $$i/*.o;\
 	done
 	mv vic20/crt0.o vic20.o
+	cp vic20/*.joy .
 
 #-----------------------------------------------------------------------------
 # C16, C116

libsrc/vic20/.cvsignore

@@ -1 +1,2 @@
+*.joy
 *.tgi

libsrc/vic20/Makefile

@@ -4,6 +4,9 @@
 
 .SUFFIXES: .o .s .c
 
+#--------------------------------------------------------------------------
+# Rules
+
 %.o:   	%.c
 	@$(CC) $(CFLAGS) $<
 	@$(AS) -o $@ $(AFLAGS) $(*).s
@@ -11,6 +14,18 @@
 %.o:	%.s
 	@$(AS) -g -o $@ $(AFLAGS) $<
 
+%.emd:	%.o ../runtime/zeropage.o
+	@$(LD) -t module -o $@ $^
+
+%.joy:	%.o ../runtime/zeropage.o
+	@$(LD) -t module -o $@ $^
+
+%.tgi:	%.o ../runtime/zeropage.o
+	@$(LD) -t module -o $@ $^
+
+#--------------------------------------------------------------------------
+# Object files
+
 OBJS =	_scrsize.o	\
 	break.o		\
 	crt0.o		\
@@ -23,11 +38,25 @@ OBJS =	_scrsize.o	\
         kernal.o        \
         kplot.o         \
         randomize.o     \
-	readjoy.o	\
+	revers.o
-	revers.o	
 
-all:	$(OBJS)
+#--------------------------------------------------------------------------
+# Drivers
+
+EMDS =
+
+JOYS = vic20-stdjoy.joy
+
+TGIS =
+
+#--------------------------------------------------------------------------
+# Targets
+
+all: 	$(OBJS) $(EMDS) $(JOYS) $(TGIS)
+
+../runtime/zeropage.o:
+	$(MAKE) -C $(dir $@) $(notdir $@)
 
 clean:
-	@rm -f $(OBJS)
+	@rm -f $(OBJS) $(EMDS:.emd=.o) $(JOYS:.joy=.o) $(TGIS:.tgi=.o)
 

libsrc/vic20/readjoy.s

@@ -1,42 +0,0 @@
-;
-; Ullrich von Bassewitz, 23.09.1998
-; Adapted for Vic20 by Steve Schmidtke 05.08.2002
-;
-; unsigned readjoy (unsigned char joy);
-;
-
-        .export         _readjoy
-
-        .include        "vic20.inc"
-
-
-; The current implemenation will ignore the joystick number because we do only
-; have one joystick
-
-
-.proc   _readjoy
-
-        lda     #$7F            ; mask for VIA2 JOYBIT: sw3
-        ldx     #$C3            ; mask for VIA1 JOYBITS: sw0,sw1,sw2,sw4
-        sei                     ; necessary?
-
-        ldy     VIA2_DDRB       ; remember the date of DDRB
-        sta     VIA2_DDRB       ; set JOYBITS on this VIA for input
-        lda     VIA2_JOY        ; read JOYBIT: sw3
-        sty     VIA2_DDRB       ; restore the state of DDRB
-        asl                     ; Shift sw3 into carry
-
-        ldy     VIA1_DDRA       ; remember the state of DDRA
-        stx     VIA1_DDRA       ; set JOYBITS on this VIA for input
-        lda     VIA1_JOY        ; read JOYBITS: sw0,sw1,sw2,sw4
-        sty     VIA1_DDRA       ; restore the state of DDRA
-
-        cli                     ; necessary?
-        ror                     ; Shift sw3 into bit 7
-        and     #$9E            ; Mask relevant bits
-        eor     #$9E            ; Active states are inverted
-
-        rts
-
-.endproc
-

libsrc/vic20/vic20-stdjoy.s

@@ -0,0 +1,115 @@
+;
+; Standard joystick driver for the VIC20
+;
+; Ullrich von Bassewitz, 2002-12-20
+; Using code from Steve Schmidtke
+;
+
+	.include 	"zeropage.inc"
+
+      	.include 	"joy-kernel.inc"
+        .include        "joy-error.inc"
+        .include        "vic20.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   $02                     ; JOY_UP
+        .byte   $04                     ; JOY_DOWN
+        .byte   $08                     ; JOY_LEFT
+        .byte   $80                     ; 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       = 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     #<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.
+; The current implemenation will ignore the joystick number because we do only
+; have one joystick
+
+READ:	lda     #$7F            ; mask for VIA2 JOYBIT: sw3
+        ldx     #$C3            ; mask for VIA1 JOYBITS: sw0,sw1,sw2,sw4
+        sei                     ; necessary?
+
+        ldy     VIA2_DDRB       ; remember the date of DDRB
+        sta     VIA2_DDRB       ; set JOYBITS on this VIA for input
+        lda     VIA2_JOY        ; read JOYBIT: sw3
+        sty     VIA2_DDRB       ; restore the state of DDRB
+        asl                     ; Shift sw3 into carry
+
+        ldy     VIA1_DDRA       ; remember the state of DDRA
+        stx     VIA1_DDRA       ; set JOYBITS on this VIA for input
+        lda     VIA1_JOY        ; read JOYBITS: sw0,sw1,sw2,sw4
+        sty     VIA1_DDRA       ; restore the state of DDRA
+
+        cli                     ; necessary?
+        ror                     ; Shift sw3 into bit 7
+        and     #$9E            ; Mask relevant bits
+        eor     #$9E            ; Active states are inverted
+
+        rts
+
+