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5c5d01d84a
in the distribution. Added --forget-inc-paths to the command line of the assembler in the Makefiles, because the assembler does now have builtin paths and will find include files from an installation first. Hopefully fixed any problems that arose from the two changes. git-svn-id: svn://svn.cc65.org/cc65/trunk@4223 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.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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.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 ; JOY_FIRE2 unavailable
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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 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 = 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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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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