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86 lines
2.0 KiB
ArmAsm
86 lines
2.0 KiB
ArmAsm
;
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; Groepaz/Hitmen, 11.10.2015
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;
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; high level implementation for the soft80 implementation
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;
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; char cgetc (void);
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;
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.export soft80_cgetc
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.import soft80_internal_cellcolor, soft80_internal_cursorxlsb
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.import cursor
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.importzp tmp1
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.include "cbm_kernal.inc"
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.include "c64.inc"
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.include "soft80.inc"
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soft80_cgetc:
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lda KEY_COUNT ; Get number of characters
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bne @L3 ; Jump if there are already chars waiting
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sec
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jsr invertcursor ; set cursor on or off accordingly
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@L1: lda KEY_COUNT ; wait for key
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beq @L1
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clc
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jsr invertcursor ; set cursor on or off accordingly
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@L3: jsr KBDREAD ; Read char and return in A
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ldx #0
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rts
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; Switch the cursor on or off (invert)
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invertcursor:
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lda cursor
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bne @invert
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rts
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@invert:
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sei
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lda $01 ; enable RAM under I/O
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pha
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lda #$34
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sta $01
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; do not use soft80_putcolor here to make sure the cursor is always
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; shown using the current textcolor without disturbing the "color voodoo"
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; in soft80_cputc
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ldy #0
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bcs @set
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; restore old value
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lda tmp1
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bcc @lp0
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@set:
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; save old value
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lda (CRAM_PTR),y ; vram
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sta tmp1
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lda soft80_internal_cellcolor
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@lp0:
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sta (CRAM_PTR),y ; vram
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ldx soft80_internal_cursorxlsb
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ldy #7
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@lp1:
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lda (SCREEN_PTR),y
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eor nibble,x
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sta (SCREEN_PTR),y
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dey
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bpl @lp1
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pla
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sta $01 ; enable I/O
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cli
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rts
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.rodata
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nibble: .byte $f0, $0f
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;-------------------------------------------------------------------------------
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; force the init constructor to be imported
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.import soft80_init
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conio_init = soft80_init
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