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126 lines
2.2 KiB
ArmAsm
126 lines
2.2 KiB
ArmAsm
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; Standard PET userport joystick driver for the PET
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;
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; Marco van den Heuvel, 2010-01-23
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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 "pet.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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; 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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.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:
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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 #0
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sta VIA_DDRA
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lda VIA_PRA
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and #$0f
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cmp #$0c
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bne @notc1
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lda #$0f
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bne @end1
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@notc1:
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ora #$10
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@end1:
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eor #$1f
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rts
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; Read joystick 2
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joy2:
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lda #0
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sta VIA_DDRA
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lda VIA_PRA
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lsr
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lsr
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lsr
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lsr
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cmp #$0c
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bne @notc2
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lda #$0f
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bne @end2
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@notc2:
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ora #$10
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@end2:
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eor #$1f
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ldx #0
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rts
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