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Switch to assembler for cputc implementation.
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parent
5c8cd00dd5
commit
0a6afb59c0
@ -14,7 +14,7 @@ SYMBOLS {
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__HIMEM__: type = weak, value = $2000; # Presumed RAM end
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__HIMEM__: type = weak, value = $2000; # Presumed RAM end
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}
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}
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MEMORY {
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MEMORY {
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ZP: file = "", define = yes, start = $0002, size = $001A;
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ZP: file = "", define = yes, start = $0002, size = $001A + $0005;
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RAM: file = %O, define = yes, start = %S, size = __HIMEM__ - __STACKSIZE__ - %S;
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RAM: file = %O, define = yes, start = %S, size = __HIMEM__ - __STACKSIZE__ - %S;
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}
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}
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SEGMENTS {
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SEGMENTS {
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@ -26,4 +26,5 @@ SEGMENTS {
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DATA: load = RAM, type = rw;
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DATA: load = RAM, type = rw;
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BSS: load = RAM, type = bss, define = yes;
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BSS: load = RAM, type = bss, define = yes;
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ZEROPAGE: load = ZP, type = zp;
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ZEROPAGE: load = ZP, type = zp;
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EXTZP: load = ZP, type = rw, define = yes;
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}
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}
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@ -1,71 +0,0 @@
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/*
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* cputc.c
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*
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* void __fastcall__ cputcxy (unsigned char x, unsigned char y, char c);
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* void __fastcall__ cputc (char c);
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*/
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#include <conio.h>
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/* Implements a 25 by 25 screen in the 1024 bytes video ram (32 by 32) */
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#define LINEWIDTH 0x20
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#define SCREENBASE ((char *) 0xd000)
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#define TOP_OFFSET 4
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#define LEFT_OFFSET 3
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#define SCREENVISBASE (SCREENBASE + 4 * LINEWIDTH + LEFT_OFFSET)
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#define WIDTH 25
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#define HEIGHT 25
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static unsigned char xpos = 0;
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static unsigned char ypos = 0;
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void __fastcall__ cputc(char c)
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{
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char * const cp = SCREENVISBASE + ypos * LINEWIDTH + xpos;
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*cp = c;
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xpos += 1;
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if (xpos > WIDTH - 1) {
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xpos = 0;
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ypos += 1;
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if (ypos > HEIGHT - 1) {
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ypos = 0;
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}
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}
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}
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void __fastcall__ cputcxy (unsigned char x, unsigned char y, char c)
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{
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xpos = x > WIDTH - 1 ? WIDTH - 1 : x;
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ypos = y > HEIGHT - 1 ? HEIGHT - 1 : y;
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cputc(c);
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}
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unsigned char wherex (void)
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{
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return xpos;
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}
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unsigned char wherey (void)
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{
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return ypos;
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}
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void __fastcall__ gotox (unsigned char x)
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{
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xpos = x;
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}
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void __fastcall__ gotoy (unsigned char y)
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{
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ypos = y;
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}
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void __fastcall__ gotoxy (unsigned char x, unsigned char y)
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{
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xpos = x;
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ypos = y;
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}
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117
libsrc/c1p/cputc.s
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117
libsrc/c1p/cputc.s
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@ -0,0 +1,117 @@
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;
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; Ullrich von Bassewitz, 06.08.1998
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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, plot
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.import popa, _gotoxy
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.include "c1p.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 #$0A ; 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 #$0D ; LF?
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beq newline ; Recalculate pointers
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; Printable char of some sort
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; cmp #' '
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; bcc cputdirect ; Other control char < 0x20
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; tay
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; bmi L10
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; cmp #$60
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; bcc L2
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; and #$DF
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; bne cputdirect ; Branch always
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;L2: and #$3F
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cputdirect:
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jsr putchar ; Write the character to the screen
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; Advance cursor position
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advance:
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cpy SCR_LINELEN ; xsize-1
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bne L3
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jsr newline ; new line
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ldy #$FF ; + cr
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L3: iny
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sty CURS_X
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rts
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newline:
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lda SCR_LINELEN ; xsize-1
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sec ; Account for -1 above
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adc SCREEN_PTR
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sta SCREEN_PTR
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bcc L4
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inc SCREEN_PTR+1
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L4: inc CURS_Y
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rts
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; Handle character if high bit set
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; L10: and #$7F
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; cmp #$7E ; PI?
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; bne L11
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; lda #$5E ; Load screen code for PI
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; bne cputdirect
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; L11: ora #$40
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; bne cputdirect
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; Set cursor position, calculate RAM pointers
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plot: ldy CURS_Y
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lda ScrLo,y
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sta SCREEN_PTR
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lda ScrHi,y
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; ldy SCR_LINELEN
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; cpy #40+1
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; bcc @L1
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; asl SCREEN_PTR ; 80 column mode
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; rol a
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;@L1: ora #$80 ; Screen at $8000
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sta SCREEN_PTR+1
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rts
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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 CURS_X
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sta (SCREEN_PTR),y ; Set char
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rts
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; Screen address tables - offset to real screen
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.rodata
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ScrLo: .byte $83, $A3, $C3, $E3, $03, $23, $43, $63
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.byte $83, $A3, $C3, $E3, $03, $23, $43, $63
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.byte $83, $A3, $C3, $E3, $03, $23, $43, $63
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.byte $83
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ScrHi: .byte $D0, $D0, $D0, $D0, $D1, $D1, $D1, $D1
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.byte $D1, $D1, $D1, $D1, $D2, $D2, $D2, $D2
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.byte $D2, $D2, $D2, $D2, $D3, $D3, $D3, $D3
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.byte $D3
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7
libsrc/c1p/extzp.inc
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7
libsrc/c1p/extzp.inc
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@ -0,0 +1,7 @@
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;
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; Additional zero page locations for the Challenger 1P.
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;
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; ------------------------------------------------------------------------
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.globalzp CURS_X, CURS_Y, SCR_LINELEN, SCREEN_PTR
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libsrc/c1p/extzp.s
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23
libsrc/c1p/extzp.s
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@ -0,0 +1,23 @@
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;
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; Additional zero page locations for the Challenger 1P.
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; NOTE: The zeropage locations contained in this file get initialized
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; in the startup code, so if you change anything here, be sure to check
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; not only the linker config, but also the startup file.
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;
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; ------------------------------------------------------------------------
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.include "extzp.inc"
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.segment "EXTZP" : zeropage
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; The following values get initialized from a table in the startup code.
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; While this sounds crazy, it has reasons that have to do with modules (and
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; we have the space anyway). So when changing anything, be sure to adjust the
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; initializer table
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CURS_X: .byte 0
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CURS_Y: .byte 0
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SCR_LINELEN: .byte 24
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SCREEN_PTR: .res 2
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; size 5
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17
libsrc/c1p/gotoxy.s
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17
libsrc/c1p/gotoxy.s
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;
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; Ullrich von Bassewitz, 06.08.1998
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;
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; void gotoxy (unsigned char x, unsigned char y);
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;
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.export _gotoxy
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.import popa, plot
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.importzp CURS_X, CURS_Y
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_gotoxy:
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sta CURS_Y ; Set Y
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jsr popa ; Get X
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sta CURS_X ; Set X
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jmp plot ; Set the cursor position
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