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67 lines
1.4 KiB
ArmAsm
67 lines
1.4 KiB
ArmAsm
;
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; 2003-04-13, Ullrich von Bassewitz
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; 2014-09-04, Greg King
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;
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; char cgetc (void);
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;
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.export _cgetc
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.constructor initcgetc
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.import cursor
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.forceimport disable_caps
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.include "atmos.inc"
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; ------------------------------------------------------------------------
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;
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.proc _cgetc
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lda KEYBUF ; Do we have a character?
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bmi @L2 ; Yes: Get it
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; No character, enable cursor and wait
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lda cursor ; Should cursor be off?
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beq @L1 ; Skip if so
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lsr STATUS
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sec ; Cursor ON
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rol STATUS
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@L1: lda KEYBUF
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bpl @L1
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; If the cursor was enabled, disable it now
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ldx cursor
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beq @L2
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dec STATUS ; Clear bit zero
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; We have the character, clear the "available" flag
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@L2: and #$7F ; Mask out avail flag
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sta KEYBUF
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ldx #>$0000
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ldy MODEKEY
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cpy #FUNCTKEY
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bne @L3
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ora #$80 ; FUNCT-key pressed
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; Done
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@L3: rts
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.endproc
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; ------------------------------------------------------------------------
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; Switch the cursor off. Code goes into the ONCE segment,
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; which will be reused after it is run.
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.segment "ONCE"
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initcgetc:
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lsr STATUS
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asl STATUS ; Clear bit zero
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rts
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