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d6c3bd29ac
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 :-((
134 lines
3.7 KiB
ArmAsm
134 lines
3.7 KiB
ArmAsm
;
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; Standard joystick driver for the Apple ][. May be used multiple times
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; when statically linked to the application.
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;
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; Ullrich von Bassewitz, 2003-05-02
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; Oliver Schmidt, 2008-02-25
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; Using the readjoy code from Stefan Haubenthal
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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 "apple2.inc"
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; ------------------------------------------------------------------------
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; Constants
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THRESHOLD = 20 ; Deviation from center triggering movement
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; ------------------------------------------------------------------------
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; ROM entry points
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PREAD := $FB1E ; Read paddle in X, return AD conv. value in Y
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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 $10
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.byte $20
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.byte $04
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.byte $08
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.byte $40
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.byte $80
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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 READJOY
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.addr 0 ; IRQ not used
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; ------------------------------------------------------------------------
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.code
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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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INSTALL:
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lda #<JOY_ERR_OK
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ldx #>JOY_ERR_OK
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; Fall through
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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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UNINSTALL:
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rts
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; COUNT: Return the total number of available joysticks in a/x.
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COUNT:
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lda #$02 ; Number of joysticks we support
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ldx #$00
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rts
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; READ: Read a particular joystick passed in A.
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READJOY:
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bit $C082 ; Switch in ROM
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and #$01 ; Restrict joystick number
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; Read horizontal paddle
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asl ; Joystick number -> paddle number
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tax ; Set paddle number (0, 2)
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jsr PREAD ; Read paddle value
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lda #$00 ; 0 0 0 0 0 0 0 0
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cpy #127 - THRESHOLD
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ror ; !LEFT 0 0 0 0 0 0 0
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cpy #127 + THRESHOLD
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ror ; RIGHT !LEFT 0 0 0 0 0 0
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; Read vertical paddle
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pha
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inx ; Set paddle number (1, 3)
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jsr PREAD ; Read paddle value
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pla
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cpy #127 - THRESHOLD
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ror ; !UP RIGHT !LEFT 0 0 0 0 0
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cpy #127 + THRESHOLD
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ror ; DOWN !UP RIGHT !LEFT 0 0 0 0
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; Read primary button
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tay
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lda BUTN0-1,x ; Check button (1, 3)
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asl
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tya
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ror ; FIRE DOWN !UP RIGHT !LEFT 0 0 0
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; Read secondary button
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tay
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inx
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txa
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and #$03 ; IIgs has fourth button at TAPEIN
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tax
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lda BUTN0-1,x ; Check button (2, 0)
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asl
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tya
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ror ; FIRE2 FIRE DOWN !UP RIGHT !LEFT 0 0
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; Finalize
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eor #%00010100 ; FIRE2 FIRE DOWN UP RIGHT LEFT 0 0
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ldx #$00
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bit $C080 ; Switch in LC bank 2 for R/O
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rts
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