102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
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/*
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This is a demonstration of integrating the C
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standard I/O (stdio) functions with the display,
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so that standard functions like printf() can be used.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <cv.h>
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#include <cvu.h>
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// overrides value in common.h
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#define COLS 40
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#include "common.h"
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//#link "common.c"
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//#link "fonts.s"
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void setup_40_column_font() {
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cv_set_screen_mode(CV_SCREENMODE_TEXT);
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cv_set_image_table(IMAGE);
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cv_set_character_pattern_t(PATTERN);
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copy_default_character_set();
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}
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char cursor_x; // current cursor column
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char cursor_y; // current cursor row
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// clear the screen to ' ' (blank spaces)
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void clrscr() {
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cvu_vmemset(IMAGE, ' ', COLS*ROWS);
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}
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void setup_stdio() {
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cursor_x = 0;
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cursor_y = 0;
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clrscr();
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}
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// scroll the screen upward, by copying each row
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// of VRAM to its previous row.
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void scrollup() {
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char buf[COLS];
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char y;
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for (y=0; y<ROWS-1; y++) {
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cvu_vmemtomemcpy(buf, IMAGE + COLS*y + COLS, COLS);
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cvu_memtovmemcpy(IMAGE + COLS*y, buf, COLS);
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}
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cvu_vmemset(IMAGE + COLS*(ROWS-1), ' ', COLS);
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}
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// move cursor to next line, scrolling when it hits the bottom.
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void newline() {
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if (cursor_y >= ROWS-1) {
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scrollup();
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} else {
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cursor_y++;
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}
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}
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// write a character to the screen.
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int putchar(int ch) {
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switch (ch) {
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case '\n':
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newline(); // move cursor to next line
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case '\r':
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cursor_x = 0; // move cursor to start of line
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return 0;
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}
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// output character to VRAM at cursor position
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cvu_voutb(ch, IMAGE + COLS*cursor_y + cursor_x);
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// move cursor to right, going to next line if neccessary
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cursor_x++;
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if (cursor_x >= COLS) {
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newline();
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cursor_x = 0;
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}
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}
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#ifdef __MAIN__
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// test program
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void main() {
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unsigned char byteval = 123;
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signed char charval = 123;
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short shortval = 12345;
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setup_40_column_font();
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setup_stdio();
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cv_set_colors(CV_COLOR_LIGHT_GREEN, CV_COLOR_BLACK);
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cv_set_screen_active(true);
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printf("HELLO WORLD!\n");
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while (1) {
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printf("char %d byte %u sh %d\n",
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charval++, byteval++, shortval++);
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}
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}
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#endif
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