mirror of https://github.com/cc65/cc65.git
156 lines
4.3 KiB
ArmAsm
156 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 ; $1F
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present and determine the amount of
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; memory available.
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; Must return an JOY_ERR_xx code in a/x.
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;
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INSTALL:
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lda #JOY_ERR_OK ; Assume we have a "joystick"
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.assert JOY_ERR_OK = 0, error
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tax ; Set high byte
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ldy VIC_CLK_128 ; Test for a C128
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cpy #$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:
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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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