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cgetc export data now

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This commit is contained in:
jede 2022-04-26 00:40:16 +02:00
parent 451acb3423
commit e9597e8721
2 changed files with 40 additions and 14 deletions
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34
libsrc/telestrat/cgetc.s
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@ -5,24 +5,38 @@
.import cursor
.export store_char
.include "telestrat.inc"
.proc _cgetc
; this routine could be quicker if we wrote in page 2 variables,
; but it's better to use telemon routine in that case, because telemon can manage 4 I/O
ldx cursor ; if cursor equal to 0, then switch off cursor
; This routine could be quicker if we wrote in page 2 variables,
; But it's better to use telemon routine in that case, because telemon can manage 4 I/O
ldx cursor ; If cursor equal to 0, then switch off cursor
beq switchoff_cursor
ldx #$00 ; x is the first screen
BRK_TELEMON(XCSSCR) ; display cursor
jmp loop ; could be replaced by a bne/beq but 'jmp' is cleaner than a bne/beq which could expect some matters
BRK_TELEMON(XCSSCR) ; Display cursor
jmp start ; Could be replaced by a bne/beq but 'jmp' is cleaner than a bne/beq which could expect some matters
switchoff_cursor:
; at this step X is equal to $00, X must be set, because it's the id of the screen (telestrat can handle 4 virtuals screen)
BRK_TELEMON(XCOSCR) ; switch off cursor
; At this step X is equal to $00, X must be set, because it's the id of the screen (telestrat can handle 4 virtuals screen)
BRK_TELEMON(XCOSCR) ; Switch off cursor
loop:
BRK_TELEMON XRD0 ; waits until key is pressed
bcs loop
start:
lda store_char ; Does kbhit store a value in store_char ?
bne @out ; Yes, we returns A and we reset store_char
@wait_key:
BRK_TELEMON XRD0 ; Waits until key is pressed
bcs @wait_key
ldx #$00
rts
@out:
ldx #$00
stx store_char
rts
.endproc
.data
store_char:
.byte 0

20
libsrc/telestrat/kbhit.s
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@ -6,12 +6,24 @@
.export _kbhit
.import store_char
.include "telestrat.inc"
_kbhit:
BRK_TELEMON XRD0
lda store_char ; Check if a key has been detected previously
beq @call_telemon ; No, calls Telemon routine
lda #$01 ; There is a key pressed previously, return 1
ldx #$00
txa
rol
eor #$01
rts
@call_telemon:
BRK_TELEMON XRD0
ldx #$00
bcs @no_char_action
sta store_char
lda #$01
rts
@no_char_action:
tax
rts