84 lines
1.5 KiB
Plaintext
84 lines
1.5 KiB
Plaintext
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#include <stdlib.h>
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#include <string.h>
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#include "cv.h"
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#include "cvu.h"
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#define COLOR ((const cv_vmemp)0x2000)
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#define IMAGE ((const cv_vmemp)0x1c00)
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#define COLS 32
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#define ROWS 24
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typedef unsigned char byte;
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typedef signed char sbyte;
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typedef unsigned short word;
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uintptr_t __at(0x6a) font_bitmap_a;
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uintptr_t __at(0x6c) font_bitmap_0;
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volatile bool vint;
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volatile uint_fast8_t vint_counter;
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void vint_handler(void)
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{
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vint = true;
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vint_counter++;
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}
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void setup_32_column_font() {
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cv_set_image_table(IMAGE);
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cvu_memtovmemcpy(0x1800, (void *)(font_bitmap_0 - '0'*8), 256*8);
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cv_set_character_pattern_t(0x1800);
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cv_set_screen_mode(CV_SCREENMODE_STANDARD);
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cv_set_color_table(COLOR);
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cvu_vmemset(COLOR, 0x36, 8); // set color for chars 0-63
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cvu_vmemset(COLOR+8, 0x06, 32-8); // set chars 63-255
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}
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char cursor_x;
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char cursor_y;
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void clrscr() {
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cvu_vmemset(IMAGE, ' ', COLS*ROWS);
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}
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#define LOCHAR 0x0
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#define HICHAR 0xff
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#define CHAR(ch) (ch-LOCHAR)
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byte getchar(byte x, byte y) {
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return cvu_vinb(IMAGE + y*COLS + x);
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}
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void putchar(byte x, byte y, byte attr) {
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cvu_voutb(attr, IMAGE + y*COLS + x);
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}
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void putstring(byte x, byte y, const char* string) {
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while (*string) {
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putchar(x++, y, CHAR(*string++));
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}
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}
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void wait_vsync() {
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vint = false;
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while (!vint) ;
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}
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void delay(byte i) {
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while (i--) {
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wait_vsync();
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}
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}
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void main() {
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setup_32_column_font();
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cv_set_screen_active(true);
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cv_set_vint_handler(&vint_handler);
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while(1);
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}
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