#include <detpic32.h>

#define UP 1
#define DOWN 0

void wait(int);

int main(void) {
    int state = 0;
    int cnt = 0;
    char c;
    do {
        putChar('\r'); // Carriage return character
        printInt(cnt, 10 | 3 << 16); // 0x0003000A: decimal w/ 3 digits
        putChar('\t'); // Tab character
        printInt(cnt, 2 | 8 << 16); // 0x00080002: binary w/ 8 bits

        wait(5); // wait 0.5s

        c = inkey();
        if (c == '+')
            state = UP;
        if (c == '-')
            state = DOWN;
        if (c == 'S')
            while (inkey() != 'R');

        if (state == UP)
            cnt = (cnt + 1) & 0xFF; // Up counter MOD 256
        else
            cnt = (cnt - 1) & 0xFF; // Down counter MOD 256
    } while (c != 'q');
    return 0;
}

void wait(int ts) {
    int i;
    for (i = 0; i < 515000 * ts; i++); // wait approximately ts/10 seconds
}