mirror of
https://github.com/cc65/cc65.git
synced 2024-10-31 04:04:49 +00:00
6af35e774d
Rewrite the driver code to make it shorter. git-svn-id: svn://svn.cc65.org/cc65/trunk@2117 b7a2c559-68d2-44c3-8de9-860c34a00d81
130 lines
3.2 KiB
ArmAsm
130 lines
3.2 KiB
ArmAsm
;
|
|
; Standard joystick driver for the Apple ][. May be used multiple times when
|
|
; linked to the statically application.
|
|
;
|
|
; Ullrich von Bassewitz, 2003-05-02
|
|
; Using the readjoy code from Stefan Haubenthal
|
|
;
|
|
|
|
.include "zeropage.inc"
|
|
|
|
.include "joy-kernel.inc"
|
|
.include "joy-error.inc"
|
|
.include "apple2.inc"
|
|
|
|
.macpack generic
|
|
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Constants
|
|
|
|
OFFS = 10
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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 $40
|
|
.byte $80
|
|
.byte $10
|
|
.byte $20
|
|
.byte $08
|
|
.byte $00 ; Future expansion
|
|
.byte $00 ; Future expansion
|
|
.byte $00 ; Future expansion
|
|
|
|
; Jump table.
|
|
|
|
.word INSTALL
|
|
.word UNINSTALL
|
|
.word COUNT
|
|
.word READJOY
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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 #>JOY_COUNT
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; READ: Read a particular joystick passed in A.
|
|
;
|
|
|
|
READJOY:
|
|
and #$01 ; Fix joystick number
|
|
asl a ;
|
|
tax ; Joystick number (0,2) into X
|
|
|
|
; Read joystick
|
|
|
|
lda OPEN_APPLE,x ; Check fire button
|
|
and #$80 ; BTN 0 0 0 0 0 0 0
|
|
|
|
pha
|
|
jsr PREAD ; Read first paddle value
|
|
pla
|
|
cpy #127-OFFS
|
|
ror a ; /LEFT BTN 0 0 0 0 0 0
|
|
cpy #127+OFFS
|
|
ror a ; RIGHT /LEFT BTN 0 0 0 0 0
|
|
|
|
inx
|
|
pha
|
|
jsr PREAD ; Read second paddle
|
|
pla
|
|
cpy #127-OFFS
|
|
ror a ; /UP RIGHT /LEFT BTN 0 0 0 0
|
|
cpy #127+OFFS
|
|
ror a ; DOWN /UP RIGHT /LEFT BTN 0 0 0
|
|
eor #%01010000 ; DOWN UP RIGHT LEFT BTN 0 0 0
|
|
|
|
ldx #0 ; fix X
|
|
rts
|
|
|
|
|