timeout.c

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#include "../include/utilities.h"
#include "../include/stdio.h"
char ch = 'A';
#define DELAY 2
int delX[] = {1, 0, -1, 0};
int delY[] = {0, 1, 0, -1};
int direction = 0;
int x = 0;
int y = 0;
uint8_t style = 0;
void callback();
char nextAlphabet(char);
void timeout() {
    // _draw_char(ch++, 0, 0x0F);
    callback();
}
void callback() {
    style = (style+1) & 0b00001111;
    ch = nextAlphabet(ch);
    draw_char_style(ch, y, x, style);
    if (y == 0 && x == 0) direction = 0;
    if (y == 0 && x == 79) direction = 1;
    if (y == 24 && x == 79) direction = 2;
    if (y == 24 && x == 0) direction = 3;
    y += delY[direction];
    x += delX[direction];
}
char nextAlphabet(char c) {
    if (c == 'z') return 'A';
    if (c == 'Z') return 'a';
    return c+1;
}