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;
; Groepaz/Hitmen, 11.10.2015
;
; high level implementation for the soft80 implementation
;
; char cgetc (void);
;
.export soft80_cgetc
.import soft80_internal_cellcolor, soft80_internal_cursorxlsb
.import cursor
.importzp tmp1
.include "cbm_kernal.inc"
.include "c64.inc"
.include "soft80.inc"
soft80_cgetc:
lda KEY_COUNT ; Get number of characters
bne @L3 ; Jump if there are already chars waiting
sec
jsr invertcursor ; set cursor on or off accordingly
@L1: lda KEY_COUNT ; wait for key
beq @L1
clc
jsr invertcursor ; set cursor on or off accordingly
@L3: jsr KBDREAD ; Read char and return in A
ldx #0
rts
; Switch the cursor on or off (invert)
invertcursor:
lda cursor
bne @invert
rts
@invert:
sei
lda $01 ; enable RAM under I/O
pha
lda #$34
sta $01
ldy #$00
jsr setcolor
ldx soft80_internal_cursorxlsb
@lp1:
lda (SCREEN_PTR),y
eor nibble,x
sta (SCREEN_PTR),y
iny
cpy #8
bne @lp1
pla
sta $01 ; enable I/O
cli
rts
; do not use soft80_putcolor here to make sure the cursor is always
; shown using the current textcolor without disturbing the "color voodoo"
; in soft80_cputc
setcolor:
;ldy #0 ; is 0
bcs @set
; restore old value
lda tmp1
sta (CRAM_PTR),y ; vram
rts
@set:
; save old value
lda (CRAM_PTR),y ; vram
sta tmp1
lda soft80_internal_cellcolor
sta (CRAM_PTR),y ; vram
rts
.rodata
nibble: .byte $f0, $0f
;-------------------------------------------------------------------------------
; force the init constructor to be imported
.import soft80_init
conio_init = soft80_init
|
