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This change was suppsed to fix the issue that the former JUMPTABLE is merked as 'ro' while it is actually written to in several scenarios. When drivers are converted using co65 and then compiled into ROMs the JUMPTABLE isn't copied to RAM and therefore the write operations in question fail. However unfortunately I didn't succeed in changing that :-( Just setting the former JUMPTABLE to 'rw' broke the drivers. So I placed the DATA segment directly after the former JUMPTABLE segment. This made the drivers converted with co65 work again - obviously after changing libsrc/Makefile:235 from '--code-label' to '--data-label'. But the actual dynamic drivers still didn't work as the former JUMPTABLE wasn't placed as the beginning of the loaded file anymore. That effect could be changed by exchanging src/ld65/o65.c:1391 with src/ld65/o65.c:1394 but doing so broke the drivers again :-((
228 lines
5.7 KiB
ArmAsm
228 lines
5.7 KiB
ArmAsm
;
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; DXS/HIT-4 Player joystick driver for the C64
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;
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; Groepaz/Hitmen, 2002-12-23
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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 "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 "HEADER"
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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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; 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 IRQ
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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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; ------------------------------------------------------------------------
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; Data. Written in the IRQ, read by the READ routine
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.bss
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temp3: .byte 0
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temp4: .byte 0
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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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; IRQ entry point. Is called from the C layer as a subroutine in the
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; interrupt. The routine MUST return carry set if the interrupt has been
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; 'handled' - which means that the interrupt source is gone. Otherwise it
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; MUST return carry clear.
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IRQ: ; cia 2 setup
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ldy #$00 ; port b direction
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sty $dd03 ; => input
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sty $dd05 ; cia2 timer a highbyte
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sty $dc05 ; cia1 timer a highbyte
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iny
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sty $dd04 ; cia2 timer a lowbyte
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sty $dc04 ; cia1 timer a lowbyte
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lda #%00010001
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sta $dd0e ; control register a
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; timer: start
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; continous
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; forced load
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; serial port: input
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; cia 1 setup
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lda #%01010001
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sta $dc0e ; control register a
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; timer: start
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; continous
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; forced load
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; serial port: output
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; read directions 3
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lda $dd01 ;read cia 2 port b
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and #$0f
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sta temp3
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; read button 3
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lda $dd02 ;cia 2 port a
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and #%11111011 ;data direction
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sta $dd02 ;=> bit 2 input
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lda $dd00 ;read cia 2 p.A
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and #%00000100 ;check bit 2
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asl a
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asl a
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ora temp3
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sta temp3
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; read directions 4
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lda $dd01 ;read cia 2 port b
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lsr a
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lsr a
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lsr a
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lsr a
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sta temp4
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; read button 4
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ldx #$ff ;serial data register
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stx $dc0c ;=> writing $ff causes
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;cia to output some
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;count signals at cnt1
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ldx $dd0c ;read cia 2 serial in
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beq fire ;button press if zero
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lda temp4
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ora #%00010000
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sta temp4
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fire:
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; Default Value: $40/64 on PAL
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; $42/66 on NTSC
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lda #$41
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sta $dc05
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; Default Value: $25/37 on PAL
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; $95/149 on NTSC
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lda #0
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sta $dc04
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; We do never "handle" the interrupt, we use it just as a timer.
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clc
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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 #>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 #$1F
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rts
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; Read joystick 2
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joy2: dex
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bne joy3
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; ldx #0
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lda #$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: dex
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bne joy4
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lda temp3
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eor #$1F
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rts
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; Read joystick 4
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joy4: lda temp4
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eor #$1F
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ldx #0
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rts
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