mirror of
https://github.com/cc65/cc65.git
synced 2024-11-20 12:32:58 +00:00
125 lines
2.6 KiB
ArmAsm
125 lines
2.6 KiB
ArmAsm
;
|
|
; Standard joystick driver for the C64
|
|
;
|
|
; Ullrich von Bassewitz, 2002-12-20
|
|
;
|
|
|
|
.include "zeropage.inc"
|
|
|
|
.include "joy-kernel.inc"
|
|
.include "joy-error.inc"
|
|
.include "../inc/geossym.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 $01 ; JOY_UP
|
|
.byte $02 ; JOY_DOWN
|
|
.byte $04 ; JOY_LEFT
|
|
.byte $08 ; 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 = 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
|
|
|
|
; ------------------------------------------------------------------------
|
|
; 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.
|
|
;
|
|
|
|
READ: php
|
|
sei ; disable IRQ
|
|
lda $01
|
|
pha
|
|
lda #$35
|
|
sta $01 ; enable I/O
|
|
|
|
tax ; Joystick number into X
|
|
bne joy2
|
|
|
|
; Read joystick 1
|
|
|
|
joy1:
|
|
lda #$7F
|
|
sta cia1base
|
|
lda cia1base+1
|
|
back: tax
|
|
pla
|
|
sta $01
|
|
plp
|
|
txa
|
|
and #$1F
|
|
eor #$1F
|
|
ldx #0
|
|
rts
|
|
|
|
; Read joystick 2
|
|
|
|
joy2: lda #$E0
|
|
ldy #$FF
|
|
sta cia1base+2
|
|
lda cia1base+1
|
|
sty cia1base+2
|
|
jmp back
|