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135 lines
3.4 KiB
ArmAsm
135 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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OFFS = 10
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; ------------------------------------------------------------------------
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; ROM entry points
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PREAD := $FB1E ; Read paddle in X, return AD conv. value in Y
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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 JOY_API_VERSION ; Driver API version number
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; Button state masks (8 values)
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.byte $40
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.byte $80
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.byte $10
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.byte $20
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.byte $08
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.byte $00 ; FIRE2 not available
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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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.addr INSTALL
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.addr UNINSTALL
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.addr COUNT
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.addr READJOY
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.addr 0 ; IRQ not used
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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 UNINSTALL 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 BUTN0,x ; Check fire button
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and #$80 ; BTN 0 0 0 0 0 0 0
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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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ror a ; /LEFT BTN 0 0 0 0 0 0
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cpy #127+OFFS
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ror a ; RIGHT /LEFT BTN 0 0 0 0 0
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inx
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pha
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jsr PREAD ; Read second paddle
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pla
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cpy #127-OFFS
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ror a ; /UP RIGHT /LEFT BTN 0 0 0 0
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cpy #127+OFFS
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ror a ; DOWN /UP RIGHT /LEFT BTN 0 0 0
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eor #%01010000 ; DOWN UP RIGHT LEFT BTN 0 0 0
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ldx #$00 ; fix X
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rts
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