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Workaround for "phantom" key presses in the C128 "joystick" mouse driver.
This commit is contained in:
Christian Groessler
parent
d4c9b25b2f
commit
608dbc2cec
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@ -11,6 +11,8 @@
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.macpack generic
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IRQInd = $2FD
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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@ -25,6 +27,7 @@ HEADER:
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; Library reference
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libref:
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.addr $0000
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; Jump table
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@ -70,6 +73,15 @@ SCREEN_WIDTH = 320
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FIRE = $10
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.endenum
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;----------------------------------------------------------------------------
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; data segment
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.data
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chainIRQ:
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.byte $4c ; JMP opcode
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.word 0 ; pointer to ROM IRQ handler (will be set at runtime)
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;----------------------------------------------------------------------------
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; Global variables. The bounding box values are sorted so that they can be
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; written with the least effort in the SETBOX and GETBOX routines, so don't
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@ -92,6 +104,10 @@ INIT_save: .res 1
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Temp: .res 1
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; Keyboard buffer fill level at start of interrupt
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old_key_count: .res 1
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.rodata
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; Default values for above variables
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@ -146,6 +162,35 @@ INSTALL:
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jsr CMOVEY
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cli
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; Initialize our IRQ magic
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lda IRQInd+1
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sta chainIRQ+1
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lda IRQInd+2
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sta chainIRQ+2
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lda libref
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sta ptr3
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lda libref+1
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sta ptr3+1
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ldy #2
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lda (ptr3),y
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sta IRQInd+1
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iny
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lda (ptr3),y
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sta IRQInd+2
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iny
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lda #<(callback-1)
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sta (ptr3),y
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iny
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lda #>(callback-1)
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sta (ptr3),y
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iny
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lda #<(chainIRQ-1)
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sta (ptr3),y
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iny
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lda #>(chainIRQ-1)
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sta (ptr3),y
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; Done, return zero (= MOUSE_ERR_OK)
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ldx #$00
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@ -157,6 +202,12 @@ INSTALL:
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; No return code required (the driver is removed from memory on return).
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UNINSTALL:
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lda chainIRQ+1
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sta IRQInd+1
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lda chainIRQ+2
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sta IRQInd+2
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jsr HIDE ; Hide cursor on exit
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lda INIT_save
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sta INIT_STATUS
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@ -320,6 +371,8 @@ IOCTL: lda #<MOUSE_ERR_INV_IOCTL ; We don't support ioclts for now
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;
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IRQ: jsr CPREP
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lda KEY_COUNT
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sta old_key_count
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lda #$7F
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sta CIA1_PRA
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lda CIA1_PRB ; Read joystick #0
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@ -436,3 +489,29 @@ IRQ: jsr CPREP
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@SkipY: jsr CDRAW
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clc ; Interrupt not "handled"
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rts
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;----------------------------------------------------------------------------
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; Called after ROM IRQ handler has been run.
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; Check if there was joystick activity before and/or after the ROM handler.
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; If there was activity, discard the key presses since they are most
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; probably "phantom" key presses.
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callback:
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ldx old_key_count
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cpx KEY_COUNT
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beq @nokey
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lda Temp ; keypress before?
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bne @discard_key ; yes, discard key
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lda #$7F
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sta CIA1_PRA
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lda CIA1_PRB ; Read joystick #0
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and #$1F
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eor #$1F ; keypress after
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beq @nokey ; no, probably a real key press
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@discard_key:
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stx KEY_COUNT ; set old keyboard buffer fill level
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@nokey: rts
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@ -4,6 +4,8 @@
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; 2013-07-25, Greg King
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;
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.include "c128.inc"
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.export mouse_libref, _pen_adjuster
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.data
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@ -21,3 +23,70 @@ mouse_libref: ; generic label for mouse-kernel
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;
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_pen_adjuster:
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.addr $0000
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.addr IRQStub2
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callback: ; callback into mouse driver after ROM IRQ handler has been run
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.addr $0000 ; (filled in by mouse driver)
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jmp_rom_hdlr: ; "trampoline" to jump to ROM IRQ handler
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.addr $0000 ; (filled in by mouse driver)
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.segment "LOWCODE"
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; Called from irq.s when it thinks it chains to the original handler.
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; ROM is banked in again. In order to call the callback we have to
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; bank it out one more time.
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IRQStub2:
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; Call ROM handler and prepare stack so that it will return to us.
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; setup fake IRQ stack frame which will return to "IRQCont"
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lda #>@IRQCont
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pha
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lda #<@IRQCont
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pha
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php
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; mimic the contents saved on the stack by the ROM IRQ entry handler
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pha ; A
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pha ; X
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pha ; Y
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lda #MMU_CFG_CC65 ; MMU configuration which will be active after the ROM handler returns
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pha
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; push address of ROM handler on stack and jump to it
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lda jmp_rom_hdlr+1
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pha
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lda jmp_rom_hdlr
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pha
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rts ; jump to ROM handler
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; our MMU configuration byte we pushed on the stack before (MMU_CFG_CC65) is now active
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@IRQCont:
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; call mouse driver callback routine
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lda #>(@IRQCont2-1)
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pha
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lda #<(@IRQCont2-1)
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pha
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lda callback+1
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pha
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lda callback
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pha
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rts ; jump to callback routine
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@IRQCont2:
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; return from interrupt
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; We could just jump to $FF33, but since I don't know whether this address is valid in all
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; ROM versions, duplicate that code here.
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pla
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sta MMU_CR ; MMU configuration register
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pla
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tay
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pla
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tax
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pla
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rti
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