mirror of
https://github.com/cc65/cc65.git
synced 2024-12-26 08:32:00 +00:00
71 lines
1.2 KiB
ArmAsm
71 lines
1.2 KiB
ArmAsm
;
|
|
; Ullrich von Bassewitz, 06.08.1998
|
|
;
|
|
; char cgetc (void);
|
|
;
|
|
|
|
.export _cgetc
|
|
.constructor initcgetc
|
|
.destructor donecgetc
|
|
|
|
.import cursor
|
|
|
|
.include "c128.inc"
|
|
|
|
;--------------------------------------------------------------------------
|
|
|
|
_cgetc: lda KEY_COUNT ; Get number of characters
|
|
bne L2 ; Jump if there are already chars waiting
|
|
|
|
; Switch on the cursor if needed
|
|
|
|
lda cursor
|
|
beq L1
|
|
jsr CURS_SET ; Set cursor to current position
|
|
jsr CURS_ON
|
|
jmp L2
|
|
L1: lda #$01
|
|
jsr CURS_OFF
|
|
L2: lda KEY_COUNT ; Check characters again
|
|
beq L2
|
|
jsr CURS_OFF ; Switch cursor off, if characters available
|
|
|
|
jsr KBDREAD ; Read char and return in A
|
|
ldx #0
|
|
rts
|
|
|
|
;--------------------------------------------------------------------------
|
|
; Module constructor/destructor
|
|
|
|
.bss
|
|
keyvec: .res 2
|
|
|
|
.segment "INIT"
|
|
initcgetc:
|
|
|
|
; Save the old vector
|
|
|
|
lda KeyStoreVec
|
|
sta keyvec
|
|
lda KeyStoreVec+1
|
|
sta keyvec+1
|
|
|
|
; Set the new vector. I can only hope that this works for other C128
|
|
; versions...
|
|
|
|
lda #<$C6B7
|
|
ldx #>$C6B7
|
|
jmp SetVec
|
|
|
|
.code
|
|
donecgetc:
|
|
lda keyvec
|
|
ldx keyvec+1
|
|
SetVec: sei
|
|
sta KeyStoreVec
|
|
stx KeyStoreVec+1
|
|
cli
|
|
rts
|
|
|
|
|