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ee155a8553
Added a comment regarding usage of the driver when it is linked statically to the application. git-svn-id: svn://svn.cc65.org/cc65/trunk@1952 b7a2c559-68d2-44c3-8de9-860c34a00d81
105 lines
2.6 KiB
ArmAsm
105 lines
2.6 KiB
ArmAsm
;
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; Standard joystick driver for the Plus/4. May be used multiple times when linked
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; to the statically application.
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;
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; Ullrich von Bassewitz, 2002-12-21
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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 "../plus4/plus4.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 $00 ; Driver API version number
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; Button state masks (8 values)
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.byte $01 ; JOY_UP
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.byte $02 ; JOY_DOWN
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.byte $04 ; JOY_LEFT
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.byte $08 ; JOY_RIGHT
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.byte $10 ; 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 READ
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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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READ: ldy #$FA ; Load index for joystick #1
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tax ; Test joystick number
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beq @L1
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ldy #$FB ; Load index for joystick #2
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@L1: sei
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sty TED_KBD
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lda TED_KBD
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cli
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ldx #$00 ; Clear high byte
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and #$1F
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eor #$1F
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rts
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