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84be744418
Added interrupt vector to joystick driver. New code from Karri. Rewrote joystick initialization to make it somewhat shorter. git-svn-id: svn://svn.cc65.org/cc65/trunk@3281 b7a2c559-68d2-44c3-8de9-860c34a00d81
130 lines
3.2 KiB
ArmAsm
130 lines
3.2 KiB
ArmAsm
;
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; Standard joystick driver for the Atari Lynx.
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; The Lynx has two fire buttons. So it is not quite "standard".
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;
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; Modified by Karri Kaksonen, 2004-09-16
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; Ullrich von Bassewitz, 2002-12-20
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; Using code from Steve Schmidtke
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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 "lynx.inc"
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.include "extzp.inc"
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.macpack generic
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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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joy_mask:
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.byte $80 ; JOY_UP
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.byte $40 ; JOY_DOWN
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.byte $20 ; JOY_LEFT
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.byte $10 ; JOY_RIGHT
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.byte $01 ; JOY_FIRE
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.byte $02 ; JOY_FIRE1
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.byte $00 ;
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.byte $00 ;
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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 READ
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.addr 0 ; IRQ entry unused
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; ------------------------------------------------------------------------
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; Constants
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JOY_COUNT = 1 ; 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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; Here we also flip the joypad in case the display is flipped.
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; This install routine should be called after you send the flip code
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; to the display hardware.
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INSTALL:
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lda __viddma ; Process flipped displays
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and #2
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beq @L2
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; Set joypad for flipped display
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lda #$10
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ldx #$00
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@L1: sta joy_mask,x
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inx
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asl a
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bcc @L1
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bra @L4
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; Set joypad for normal display
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@L2: lda #$10
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ldx #$03
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@L3: sta joy_mask,x
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dex
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asl a
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bcc @L3
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; Done
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@L4: 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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READ:
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ldx #$00 ; Clear high byte
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lda JOYSTICK ; Read joystick
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and #$F3 ; Mask relevant keys
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rts
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