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https://github.com/cc65/cc65.git
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90 lines
1.8 KiB
ArmAsm
90 lines
1.8 KiB
ArmAsm
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; Written by Groepaz/Hitmen <groepaz@gmx.net>
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; Cleanup by Ullrich von Bassewitz <uz@cc65.org>
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;
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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
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.constructor conioinit
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.import popa, _gotoxy
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.import ppuinit, paletteinit, ppubuf_put
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.import setcursor
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.importzp tmp3,tmp4
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.include "nes.inc"
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;-----------------------------------------------------------------------------
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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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inc CURS_Y ; 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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jmp setcursor ; 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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ora RVS ; Set revers bit
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ldy SCREEN_PTR+1
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ldx SCREEN_PTR
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jmp ppubuf_put
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;-----------------------------------------------------------------------------
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; Initialize the conio subsystem
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conioinit:
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jsr ppuinit
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jsr paletteinit
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lda #0
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sta RVS
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sta CURS_X
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sta CURS_Y
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jmp plot ; Set the cursor
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