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https://github.com/cc65/cc65.git
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153 lines
3.7 KiB
ArmAsm
153 lines
3.7 KiB
ArmAsm
;
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; PTV-4 Player joystick driver for the C128
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;
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; Ullrich von Bassewitz, 2003-09-28, using the C64 driver from
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; Groepaz/Hitmen, 2002-12-23, which is
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; obviously based on Ullrichs driver :)
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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 "c128.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 = 4 ; 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: tax ; Joystick number into X
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bne joy2
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; Read joystick 1
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joy1: lda #$7F
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sei
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sta CIA1_PRA
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lda CIA1_PRB
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cli
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and #$1F
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eor #$1F
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rts
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; Read joystick 2
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joy2: dex
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bne joy3
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lda #$E0
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ldy #$FF
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sei
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sta CIA1_DDRA
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lda CIA1_PRA
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sty CIA1_DDRA
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cli
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and #$1F
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eor #$1F
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rts
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; Read joystick 3
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joy3:
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lda #%10000000 ; cia 2 port B Data-Direction
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sta CIA2_DDRB ; bit 7: out bit 6-0: in
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dex
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bne joy4
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lda #$80 ; cia 2 port B read/write
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sta CIA2_PRB ; (output one at PB7)
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lda CIA2_PRB ; cia 2 port B read/write
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and #$1f ; get bit 4-0 (PB4-PB0)
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eor #$1f
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rts
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; Read joystick 4
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joy4:
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lda #$00 ; cia 2 port B read/write
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sta CIA2_PRB ; (output zero at PB7)
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lda CIA2_PRB ; cia 2 port B read/write
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and #$0f ; get bit 3-0 (PB3-PB0)
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sta tmp1 ; joy 4 directions
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lda CIA2_PRB ; cia 2 port B read/write
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and #%00100000 ; get bit 5 (PB5)
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lsr
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ora tmp1
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eor #$1f
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ldx #0
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rts
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