#include <iostream>
using namespace std;
static int buffer[5];

int serialToLCD(int number) {
    // UART0->S1 TC - > transmission complete flag  ->>>>>> 0 for transimsion in progress ;;;; 1 for transision completed

    //https://community.nxp.com/thread/384138
    if (buffer[4] == 4) { buffer[4] = 0; }

    if (number > 9 || number < 0) {
        //nothing
        int x;
        cin >> x;
        serialToLCD(x); //GO BACK

        return 0;
    }
    else {
        buffer[buffer[4]] = number;
        buffer[4] += 1;
        return 1;
    }

}
int main() {
    for (int i = 0; i < 5; i++) {
        buffer[i] = 0;
    }
    serialToLCD(1);
    serialToLCD(2);
    serialToLCD(3);
    serialToLCD(4);
    serialToLCD(5);
    serialToLCD(11);


    for (int i = 0; i < 4; i++) {

        cout << buffer[i]<< "  ";
    }

}