mirror of
https://github.com/cc65/cc65.git
synced 2024-12-26 08:32:00 +00:00
116 lines
2.3 KiB
ArmAsm
116 lines
2.3 KiB
ArmAsm
;
|
|
; MultiJoy joystick driver for the Atari. May be used multiple times when linked
|
|
; to the statically application.
|
|
;
|
|
; Ullrich von Bassewitz, 2002-12-21
|
|
; Stefan Haubenthal, 2009-04-10
|
|
; Using code from Carsten Strotmann and help from Christian Groessler
|
|
;
|
|
|
|
.include "zeropage.inc"
|
|
|
|
.include "joy-kernel.inc"
|
|
.include "joy-error.inc"
|
|
.include "atari.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
|
|
.byte $04 ; JOY_DOWN
|
|
.byte $08 ; JOY_LEFT
|
|
.byte $10 ; JOY_RIGHT
|
|
.byte $01 ; JOY_FIRE
|
|
.byte $00 ; JOY_FIRE2 not available
|
|
.byte $00 ; Future expansion
|
|
.byte $00 ; Future expansion
|
|
|
|
; Jump table.
|
|
|
|
.addr INSTALL
|
|
.addr UNINSTALL
|
|
.addr COUNT
|
|
.addr READJOY
|
|
.addr 0 ; IRQ entry not used
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Constants
|
|
|
|
JOY_COUNT = 8 ; 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 #$30
|
|
sta PACTL
|
|
lda #$F0
|
|
sta PORTA
|
|
lda #$34
|
|
sta PACTL
|
|
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.
|
|
;
|
|
|
|
READJOY:
|
|
asl a
|
|
asl a
|
|
asl a
|
|
asl a
|
|
sta PORTA
|
|
|
|
; Read joystick
|
|
|
|
lda PORTA ; get position
|
|
and #%00001111
|
|
asl a
|
|
ora TRIG0 ; add button information
|
|
eor #%00011111
|
|
ldx #0 ; fix X
|
|
rts
|