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125 lines
2.6 KiB
ArmAsm
125 lines
2.6 KiB
ArmAsm
;
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; Standard joystick driver for the C64
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;
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; Ullrich von Bassewitz, 2002-12-20
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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 "../inc/geossym.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 DEINSTALL
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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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; DEINSTALL 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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DEINSTALL:
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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: php
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sei ; disable IRQ
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lda $01
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pha
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lda #$35
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sta $01 ; enable I/O
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tax ; Joystick number into X
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bne joy2
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; Read joystick 1
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joy1:
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lda #$7F
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sta cia1base
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lda cia1base+1
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back: tax
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pla
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sta $01
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plp
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txa
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and #$1F
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eor #$1F
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ldx #0
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rts
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; Read joystick 2
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joy2: lda #$E0
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ldy #$FF
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sta cia1base+2
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lda cia1base+1
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sty cia1base+2
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jmp back
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