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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.
154 lines
4.3 KiB
ArmAsm
154 lines
4.3 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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.macpack module
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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module_header _c64_numpad_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 = 1 ; Number of joysticks we support
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; ------------------------------------------------------------------------
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; Data.
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.rodata
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; <U>p '8' key
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; <D>own '2' key
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; <L>eft '4' key
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; <R>ight '6' key
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; <B>utton '5' or ENTER key
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masktable:
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; Input: LDRBU
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; Output: BRLDU
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.byte %00000000 ; $00
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.byte %00000001 ; $01
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.byte %00010000 ; $02
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.byte %00010001 ; $03
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.byte %00001000 ; $04
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.byte %00001001 ; $05
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.byte %00011000 ; $06
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.byte %00011001 ; $07
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.byte %00000010 ; $08
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.byte %00000011 ; $09
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.byte %00010010 ; $0A
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.byte %00010011 ; $0B
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.byte %00001010 ; $0C
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.byte %00001011 ; $0D
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.byte %00011010 ; $0E
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.byte %00011011 ; $0F
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.byte %00000100 ; $10
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.byte %00000101 ; $11
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.byte %00010100 ; $12
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.byte %00010101 ; $13
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.byte %00001100 ; $14
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.byte %00001101 ; $15
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.byte %00011100 ; $16
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.byte %00011101 ; $17
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.byte %00000110 ; $18
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.byte %00000111 ; $19
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.byte %00010110 ; $1A
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.byte %00010111 ; $1B
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.byte %00001110 ; $1C
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.byte %00001111 ; $1D
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.byte %00011110 ; $1E
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.byte %00011111 ; $1F
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present and determine the amount of
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; memory available.
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; Must return an JOY_ERR_xx code in a/x.
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;
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INSTALL:
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lda #JOY_ERR_OK ; Assume we have a joystick
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ldx VIC_CLK_128 ; Test for a C128
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cpx #$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 #$FD ; For ENTER and '6'
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ldy #$FE ; For '8', '5', '2', '4'
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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 ; Map ENTER ...
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lsr ; ... onto '5'
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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 #%00111110
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eor #%00111110
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lsr
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tay
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lda masktable,y ; Convert LDRBU to BRLDU
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rts
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