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8bitworkshop/presets/coleco/text32.c

88 lines
1.6 KiB
C

#include <stdio.h>
#include "cv.h"
#include "cvu.h"
#define PATTERN 0x0000
#define IMAGE 0x1c00
#define COLOR 0x2000
#define COLS 32
#define ROWS 24
uintptr_t __at(0x6a) font_bitmap_a;
uintptr_t __at(0x6c) font_bitmap_0;
void setup_32_column_font() {
cv_set_character_pattern_t(PATTERN);
cv_set_image_table(IMAGE);
cv_set_color_table(COLOR);
cv_set_screen_mode(CV_SCREENMODE_STANDARD);
cvu_memtovmemcpy(PATTERN, (void *)(font_bitmap_0 - '0'*8), 2048);
cvu_vmemset(COLOR, 0x36, 8); // set color for chars 0-63
cvu_vmemset(COLOR+8, 0x06, 32-8); // set chars 63-255
}
char cursor_x;
char cursor_y;
void clrscr() {
cvu_vmemset(IMAGE, ' ', COLS*ROWS);
}
void setup_stdio() {
cursor_x = 0;
cursor_y = 0;
clrscr();
}
void scrollup() {
char buf[COLS];
char y;
for (y=0; y<ROWS-1; y++) {
cvu_vmemtomemcpy(buf, IMAGE + COLS*y + COLS, COLS);
cvu_memtovmemcpy(IMAGE + COLS*y, buf, COLS);
}
cvu_vmemset(IMAGE + COLS*(ROWS-1), ' ', COLS);
}
void newline() {
if (cursor_y >= ROWS-1) {
scrollup();
} else {
cursor_y++;
}
}
int putchar(int ch) {
switch (ch) {
case '\n':
newline(); // TODO: scrolling
case '\r':
cursor_x = 0;
return 0;
}
cvu_voutb(ch, IMAGE + COLS*cursor_y + cursor_x);
cursor_x++;
if (cursor_x >= COLS) {
newline();
cursor_x = 0;
}
}
void main() {
unsigned char byteval = 123;
signed char charval = 123;
short shortval = 12345;
setup_32_column_font();
setup_stdio();
cv_set_screen_active(true);
printf("HELLO WORLD!\n");
while (1) {
printf("char %d byte %u sh %d\n",
charval++, byteval++, shortval++);
}
}