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116 lines
2.6 KiB
ArmAsm
116 lines
2.6 KiB
ArmAsm
;
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; Joystick driver using C128 number pad in 64 mode.
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; May be used multiple times when linked to the statically application.
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;
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; Stefan Haubenthal, 2004-01-26
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; Based on 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 "c64.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 $02 ; JOY_UP "8"
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.byte $10 ; JOY_DOWN "2"
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.byte $20 ; JOY_LEFT "4"
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.byte $08 ; JOY_RIGHT "6"
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.byte $04 ; JOY_FIRE "5" ENTER
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.byte $00 ; JOY_FIRE2 unavailable
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.byte $00 ; Future expansion
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.byte $00 ; Future expansion
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; Jump table.
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.addr INSTALL
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.addr UNINSTALL
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.addr COUNT
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.addr READ
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.addr 0 ; IRQ entry unused
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; ------------------------------------------------------------------------
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; Constants
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JOY_COUNT = 1 ; Number of joysticks we support
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; ------------------------------------------------------------------------
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; Data.
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present and determine the amount of
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; memory available.
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; Must return an JOY_ERR_xx code in a/x.
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;
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INSTALL:
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lda #JOY_ERR_OK ; Assume we have a joystick
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ldx VIC_CLK_128 ; Test for a C128
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cpx #$FF
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bne @C128 ; Jump if we have one
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lda #JOY_ERR_NO_DEVICE ; No C128 -> no numpad
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@C128: ldx #0 ; Set high byte
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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: 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: tax ; Clear high byte
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lda #$FD
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ldy #$FE
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sei
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sta VIC_KBD_128
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lda CIA1_PRB
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and #%00110000
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eor #%00110000
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lsr
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lsr
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sty VIC_KBD_128
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eor CIA1_PRB
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iny
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sty VIC_KBD_128 ; Reset to $FF
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cli
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and #%11111110
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eor #%11111110
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rts
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