mirror of https://github.com/cc65/cc65.git
127 lines
3.0 KiB
ArmAsm
127 lines
3.0 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
|
|
.macpack module
|
|
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Header. Includes jump table
|
|
|
|
.ifdef __ATARIXL__
|
|
module_header _atrxmj8_joy
|
|
.else
|
|
module_header _atrmj8_joy
|
|
.endif
|
|
|
|
; Driver signature
|
|
|
|
.byte $6A, $6F, $79 ; "joy"
|
|
.byte JOY_API_VERSION ; Driver API version number
|
|
|
|
; Library reference
|
|
|
|
.addr $0000
|
|
|
|
; Jump table.
|
|
|
|
.addr INSTALL
|
|
.addr UNINSTALL
|
|
.addr COUNT
|
|
.addr READJOY
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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
|
|
.assert JOY_ERR_OK = 0, error
|
|
tax
|
|
; 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:
|
|
and #JOY_COUNT-1 ; fix joystick number
|
|
tax ; Joystick number into X
|
|
asl a
|
|
asl a
|
|
asl a
|
|
asl a
|
|
sta PORTA
|
|
|
|
; Read joystick
|
|
|
|
lda STRIG0 ; get button
|
|
asl a
|
|
asl a
|
|
asl a
|
|
asl a
|
|
ora PORTA ; add position information
|
|
eor #$1F
|
|
cmp oldval,x
|
|
beq :+
|
|
sta oldval,x
|
|
ldx #0
|
|
stx ATRACT ; we have interaction, disable "attract mode"
|
|
: ldx #0 ; fix X
|
|
rts
|
|
|
|
.bss
|
|
|
|
oldval: .res JOY_COUNT
|