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127 lines
3.1 KiB
ArmAsm
127 lines
3.1 KiB
ArmAsm
;
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; P.A.S.E. joystick driver for the Atmos
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; Can be used multiple times when statically linked to the application.
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;
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; 2002-12-20, Based on Ullrich von Bassewitz's code.
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; 2009-12-21, Stefan Haubenthal
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; 2013-07-15, Greg King
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;
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.include "joy-kernel.inc"
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.include "joy-error.inc"
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.include "atmos.inc"
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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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; Library reference
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.addr $0000
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; Button state masks (8 values)
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.byte $10 ; JOY_UP
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.byte $08 ; JOY_DOWN
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.byte $01 ; JOY_LEFT
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.byte $02 ; JOY_RIGHT
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.byte $20 ; 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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.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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.bss
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temp1: .byte $00
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temp2: .byte $00
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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 #0
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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 #0
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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:
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tay
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lda VIA::PRA
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pha
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lda VIA::DDRA
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pha
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lda #%11000000
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sta VIA::DDRA
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lda #%10000000
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sta VIA::PRA2
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lda VIA::PRA2
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sta temp1
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lda #%01000000
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sta VIA::PRA2
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lda VIA::PRA
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sta temp2
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pla
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sta VIA::DDRA
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pla
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sta VIA::PRA2
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ldx #0
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tya
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bne @L1
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lda temp1
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eor #$FF
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rts
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@L1: lda temp2
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eor #$FF
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rts
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