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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 :-((
120 lines
3.2 KiB
ArmAsm
120 lines
3.2 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 "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 $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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