146 lines
3.4 KiB
ArmAsm
146 lines
3.4 KiB
ArmAsm
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; Standard joystick driver for the Apple ][. May be used multiple times when
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; linked to the statically application.
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;
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; Ullrich von Bassewitz, 2003-05-02
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; Using the readjoy code from Stefan Haubenthal
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;
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.include "zeropage.inc"
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.include "joy-kernel.inc"
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.include "joy-error.inc"
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.include "apple2.inc"
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.macpack generic
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; ------------------------------------------------------------------------
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; Constants
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JOY_UP = $01
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JOY_DOWN = $02
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JOY_LEFT = $04
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JOY_RIGHT = $08
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JOY_FIRE = $10
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OFFS = 10
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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.segment "JUMPTABLE"
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; Driver signature
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.byte $6A, $6F, $79 ; "joy"
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.byte $00 ; Driver API version number
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; Button state masks (8 values)
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.byte JOY_UP
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.byte JOY_DOWN
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.byte JOY_LEFT
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.byte JOY_RIGHT
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.byte JOY_FIRE
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.byte $00 ; Future expansion
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.byte $00 ; Future expansion
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.byte $00 ; Future expansion
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; Jump table.
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.word INSTALL
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.word UNINSTALL
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.word COUNT
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.word READJOY
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; ------------------------------------------------------------------------
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; Constants
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JOY_COUNT = 2 ; Number of joysticks we support
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; ------------------------------------------------------------------------
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; Data.
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present and determine the amount of
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; memory available.
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; Must return an JOY_ERR_xx code in a/x.
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;
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INSTALL:
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lda #<JOY_ERR_OK
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ldx #>JOY_ERR_OK
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; rts ; Run into DEINSTALL instead
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; ------------------------------------------------------------------------
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; UNINSTALL routine. Is called before the driver is removed from memory.
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; Can do cleanup or whatever. Must not return anything.
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;
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UNINSTALL:
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rts
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; ------------------------------------------------------------------------
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; COUNT: Return the total number of available joysticks in a/x.
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;
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COUNT:
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lda #<JOY_COUNT
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ldx #>JOY_COUNT
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rts
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; ------------------------------------------------------------------------
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; READ: Read a particular joystick passed in A.
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;
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READJOY:
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and #$01 ; Fix joystick number
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asl a ;
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tax ; Joystick number (0,2) into X
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; Read joystick
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lda #$00 ; Clear result
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ldy OPEN_APPLE,x ; Check fire button
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bpl @nofire
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ora #JOY_FIRE ; Fire button pressed
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@nofire:
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pha
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jsr PREAD ; Read first paddle value
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pla
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cpy #127-OFFS
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bcc @left
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cpy #127+OFFS
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bcc @nextpaddle
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ora #JOY_RIGHT
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.byte $2c
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@left: ora #JOY_LEFT
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@nextpaddle:
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inx
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pha
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jsr PREAD
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pla
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cpy #127-OFFS
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bcc @up
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cpy #127+OFFS
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bcc @done
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ora #JOY_DOWN
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.byte $2c
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@up: ora #JOY_UP
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@done: ldx #0 ; fix X
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rts
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