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1976d6cd32
All but one joystick drivers didn't use IRQs. Espsecially when the joystick driver kernel was the only .interruptor this meant quite some unnecessary overhead because it pulled in the whole IRQ infrastructure. I was told that the one driver using IRQs (the DXS/HIT-4 Player joystick driver for the C64) can be reworked to not do it. Until this is done that driver is defunct.
120 lines
2.5 KiB
ArmAsm
120 lines
2.5 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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.macpack module
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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module_header _pet_stdjoy_joy
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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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; 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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; ------------------------------------------------------------------------
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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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