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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 :-((
153 lines
4.3 KiB
ArmAsm
153 lines
4.3 KiB
ArmAsm
;
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; PTV-3 Player joystick driver for the VIC20
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;
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; Stefan Haubenthal, 2005-05-25
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; Groepaz/Hitmen, 2002-12-23
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; obviously based on Ullrichs driver :)
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; Using code from Steve Schmidtke
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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 "vic20.inc"
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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 0 ; IRQ entry unused
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; ------------------------------------------------------------------------
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; Constants
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VIA1_PRB := VIA1 ; User port register
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JOY_COUNT = 3 ; Number of joysticks we support
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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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; COUNT: Return the total number of available joysticks in a/x.
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;
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COUNT:
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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 #$7F ; mask for VIA2 JOYBIT: sw3
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ldx #$C3 ; mask for VIA1 JOYBITS: sw0,sw1,sw2,sw4
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sei ; necessary?
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ldy VIA2_DDRB ; remember the date of DDRB
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sta VIA2_DDRB ; set JOYBITS on this VIA for input
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lda VIA2_JOY ; read JOYBIT: sw3
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sty VIA2_DDRB ; restore the state of DDRB
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asl ; Shift sw3 into carry
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ldy VIA1_DDRA ; remember the state of DDRA
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stx VIA1_DDRA ; set JOYBITS on this VIA for input
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lda VIA1_JOY ; read JOYBITS: sw0,sw1,sw2,sw4
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sty VIA1_DDRA ; restore the state of DDRA
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cli ; necessary?
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ror ; Shift sw3 into bit 7
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and #$9E ; Mask relevant bits
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eor #$9E ; Active states are inverted
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rts
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; Read joystick 2
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joy2: lda #%10000000 ; via port B Data-Direction
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sta VIA1_DDRB ; bit 7: out bit 6-0: in
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dex
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bne joy3
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lda #$80 ; via port B read/write
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sta VIA1_PRB ; (output one at PB7)
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lda VIA1_PRB ; via port B read/write
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and #$1f ; get bit 4-0 (PB4-PB0)
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eor #$1f
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rts
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; Read joystick 3
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joy3: lda #$00 ; via port B read/write
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sta VIA1_PRB ; (output zero at PB7)
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lda VIA1_PRB ; via port B read/write
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and #$0f ; get bit 3-0 (PB3-PB0)
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sta tmp1 ; joy 4 directions
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lda VIA1_PRB ; via port B read/write
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and #%00100000 ; get bit 5 (PB5)
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lsr
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ora tmp1
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eor #$1f
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ldx #0
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rts
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