mirror of https://github.com/cc65/cc65.git
96 lines
2.1 KiB
ArmAsm
96 lines
2.1 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 gotoxy
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.import PLOT
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.import xsize
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.importzp tmp3, tmp4
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.include "pce.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 gotoxy ; Set cursor, drop x and y
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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 pointer
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L1: cmp #$0A ; LF?
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beq newline ; Recalculate pointer
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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 VRAM pointer.
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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.
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putchar:
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ora RVS ; Set revers bit
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tax
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st0 #VDC_MAWR ; Memory Address Write
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lda SCREEN_PTR
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sta VDC_DATA_LO
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lda SCREEN_PTR+1
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sta VDC_DATA_HI
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st0 #VDC_VWR ; VWR
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txa
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sta VDC_DATA_LO ; character
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lda CHARCOLOR ; pallette number
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asl a
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asl a
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asl a
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asl a
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ora #$02
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sta VDC_DATA_HI
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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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