mirror of
https://github.com/cc65/cc65.git
synced 2024-11-18 00:07:21 +00:00
104 lines
2.8 KiB
ArmAsm
104 lines
2.8 KiB
ArmAsm
;
|
|
; Pointer for library references by device drivers.
|
|
;
|
|
; Helper-routines for the interrupt handler that rejects bogus keypresses
|
|
; that are caused by mouse-like devices.
|
|
;
|
|
; 2013-07-25, Greg King
|
|
; 2014-04-26, Christian Groessler
|
|
;
|
|
|
|
.include "c128.inc"
|
|
|
|
.export mouse_libref, _pen_adjuster
|
|
|
|
.data
|
|
|
|
mouse_libref: ; generic label for mouse-kernel
|
|
|
|
; A program optionally can set this pointer to a function that gives
|
|
; a calibration value to a driver. If this pointer isn't NULL,
|
|
; then a driver that wants a value can call that function.
|
|
;
|
|
; The function might read a value from a file; or, it might ask the user
|
|
; to help calibrate the driver.
|
|
;
|
|
; void __fastcall__ (*pen_adjuster)(unsigned char *) = NULL;
|
|
;
|
|
_pen_adjuster:
|
|
.addr $0000
|
|
|
|
.addr IRQStub2
|
|
callback: ; callback into mouse driver after ROM IRQ handler has been run
|
|
.addr $0000 ; (filled in by mouse driver)
|
|
jmp_rom_hdlr: ; original ROM indirect IRQ handler address
|
|
.addr $0000 ; (filled in by mouse driver)
|
|
|
|
|
|
.segment "LOWCODE"
|
|
|
|
; Called from irq.s when it thinks it chains to the original handler.
|
|
; ROM is banked in again. In order to call the callback we have to
|
|
; bank it out one more time.
|
|
|
|
IRQStub2:
|
|
|
|
; Call ROM handler and prepare stack so that it will return to us.
|
|
|
|
; setup fake IRQ stack frame which will return to "IRQCont"
|
|
lda #>@IRQCont
|
|
pha
|
|
lda #<@IRQCont
|
|
pha
|
|
php
|
|
|
|
; mimic the contents saved on the stack by the ROM IRQ entry handler
|
|
pha ; A
|
|
pha ; X
|
|
pha ; Y
|
|
lda #MMU_CFG_CC65 ; MMU configuration which will be active after the ROM handler returns
|
|
pha
|
|
|
|
; map out ROM
|
|
ldy MMU_CR
|
|
sta MMU_CR
|
|
|
|
; push address of ROM handler on stack and jump to it
|
|
lda jmp_rom_hdlr+1
|
|
pha
|
|
lda jmp_rom_hdlr
|
|
pha
|
|
|
|
sty MMU_CR ; map in ROM
|
|
rts ; jump to ROM handler
|
|
|
|
; our MMU configuration byte we pushed on the stack before (MMU_CFG_CC65) is now active
|
|
|
|
@IRQCont:
|
|
|
|
; call mouse driver callback routine
|
|
lda #>(@IRQCont2-1)
|
|
pha
|
|
lda #<(@IRQCont2-1)
|
|
pha
|
|
lda callback+1
|
|
pha
|
|
lda callback
|
|
pha
|
|
rts ; jump to callback routine
|
|
|
|
@IRQCont2:
|
|
|
|
; return from interrupt
|
|
; We could just jump to $FF33, but since I don't know whether this address is valid in all
|
|
; ROM versions, duplicate that code here.
|
|
|
|
pla
|
|
sta MMU_CR ; MMU configuration register
|
|
pla
|
|
tay
|
|
pla
|
|
tax
|
|
pla
|
|
rti
|