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Converted the VIC20 joystick to a loadable module

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1807 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2002-12-20 23:23:06 +00:00
parent 0f9dd23746
commit 3771aaa558
5 changed files with 150 additions and 46 deletions
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1
libsrc/Makefile
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@ -92,6 +92,7 @@ vic20lib:
$(AR) a vic20.lib $$i/*.o;\
done
mv vic20/crt0.o vic20.o
cp vic20/*.joy .
#-----------------------------------------------------------------------------
# C16, C116

1
libsrc/vic20/.cvsignore
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@ -1 +1,2 @@
*.joy
*.tgi

37
libsrc/vic20/Makefile
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@ -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)

42
libsrc/vic20/readjoy.s
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@ -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

115
libsrc/vic20/vic20-stdjoy.s Normal file
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@ -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