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142 lines
2.9 KiB
ArmAsm
142 lines
2.9 KiB
ArmAsm
;
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; void cputcxy (unsigned char x, unsigned char y, char c);
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; void cputc (char c);
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;
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.export _cputcxy, _cputc, cputdirect, putchar
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.export newline, plot
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.import popa, _gotoxy
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.import PLOT
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.import xsize
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.import fontdata
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.import _plotlo
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.importzp tmp3,tmp4
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.importzp ptr3
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.include "gamate.inc"
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.include "extzp.inc"
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_cputcxy:
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pha ; Save C
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jsr popa ; Get Y
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jsr _gotoxy ; Set cursor, drop x
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pla ; Restore C
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; Plot a character - also used as internal function
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_cputc: cmp #$0d ; CR?
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bne L1
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lda #0
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sta CURS_X
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beq plot ; Recalculate pointers
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L1: cmp #$0a ; LF?
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beq newline ; Recalculate pointers
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; Printable char of some sort
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cputdirect:
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jsr putchar ; Write the character to the screen
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; Advance cursor position
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advance:
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ldy CURS_X
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iny
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cpy xsize
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bne L3
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jsr newline ; new line
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ldy #0 ; + cr
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L3: sty CURS_X
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jmp plot
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newline:
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inc CURS_Y
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; Set cursor position, calculate RAM pointers
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plot: ldy CURS_X
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ldx CURS_Y
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clc
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jmp PLOT ; Set the new cursor
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; Write one character to the screen without doing anything else, return X
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; position in Y
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putchar:
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sta ptr3
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txa
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pha
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lda #0
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sta ptr3+1
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; * 8
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asl ptr3
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rol ptr3+1
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asl ptr3
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rol ptr3+1
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asl ptr3
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rol ptr3+1
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lda ptr3
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clc
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adc #<(fontdata-$f8)
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sta ptr3
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lda ptr3+1
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adc #>(fontdata-$f8)
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sta ptr3+1
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lda CHARCOLOR
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and #1
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beq @skip_plane1
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lda #LCD_XPOS_PLANE1
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clc
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adc CURS_X
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sta LCD_X
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ldy #$f8
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@copylp1:
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lda (ptr3),y
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eor RVS
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sta LCD_DATA
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iny
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bne @copylp1
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@skip_plane1:
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lda CHARCOLOR
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and #2
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beq @skip_plane2
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lda #LCD_XPOS_PLANE2
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clc
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adc CURS_X
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sta LCD_X
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ldx CURS_Y
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lda _plotlo,x
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sta LCD_Y
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ldy #$f8
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@copylp2:
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lda (ptr3),y
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eor RVS
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sta LCD_DATA
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iny
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bne @copylp2
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@skip_plane2:
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pla
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tax
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ldy CURS_X
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rts
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;-------------------------------------------------------------------------------
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; force the init constructor to be imported
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.import initconio
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conio_init = initconio
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