mirror of
https://github.com/cc65/cc65.git
synced 2024-08-19 17:29:37 +00:00
126 lines
2.2 KiB
ArmAsm
126 lines
2.2 KiB
ArmAsm
|
;
|
||
|
; Standard PET userport joystick driver for the PET
|
||
|
;
|
||
|
; Marco van den Heuvel, 2010-01-23
|
||
|
;
|
||
|
|
||
|
.include "zeropage.inc"
|
||
|
|
||
|
.include "joy-kernel.inc"
|
||
|
.include "joy-error.inc"
|
||
|
.include "pet.inc"
|
||
|
|
||
|
|
||
|
; ------------------------------------------------------------------------
|
||
|
; 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 $01 ; JOY_UP
|
||
|
.byte $02 ; JOY_DOWN
|
||
|
.byte $04 ; JOY_LEFT
|
||
|
.byte $08 ; JOY_RIGHT
|
||
|
.byte $10 ; JOY_FIRE
|
||
|
.byte $00 ; JOY_FIRE2 unavailable
|
||
|
.byte $00 ; Future expansion
|
||
|
.byte $00 ; Future expansion
|
||
|
|
||
|
; Jump table.
|
||
|
|
||
|
.addr INSTALL
|
||
|
.addr UNINSTALL
|
||
|
.addr COUNT
|
||
|
.addr READ
|
||
|
.addr 0 ; IRQ entry unused
|
||
|
|
||
|
; ------------------------------------------------------------------------
|
||
|
; Constants
|
||
|
|
||
|
JOY_COUNT = 2 ; Number of joysticks we support
|
||
|
|
||
|
|
||
|
.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 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 #>JOY_COUNT
|
||
|
rts
|
||
|
|
||
|
; ------------------------------------------------------------------------
|
||
|
; READ: Read a particular joystick passed in A.
|
||
|
;
|
||
|
|
||
|
READ:
|
||
|
tax ; Joystick number into X
|
||
|
bne joy2
|
||
|
|
||
|
; Read joystick 1
|
||
|
|
||
|
joy1:
|
||
|
lda #0
|
||
|
sta VIA_DDRA
|
||
|
lda VIA_PRA
|
||
|
and #$0f
|
||
|
cmp #$0c
|
||
|
bne @notc1
|
||
|
lda #$0f
|
||
|
bne @end1
|
||
|
@notc1:
|
||
|
ora #$10
|
||
|
@end1:
|
||
|
eor #$1f
|
||
|
rts
|
||
|
|
||
|
; Read joystick 2
|
||
|
|
||
|
joy2:
|
||
|
lda #0
|
||
|
sta VIA_DDRA
|
||
|
lda VIA_PRA
|
||
|
lsr
|
||
|
lsr
|
||
|
lsr
|
||
|
lsr
|
||
|
cmp #$0c
|
||
|
bne @notc2
|
||
|
lda #$0f
|
||
|
bne @end2
|
||
|
@notc2:
|
||
|
ora #$10
|
||
|
@end2:
|
||
|
eor #$1f
|
||
|
ldx #0
|
||
|
rts
|