How to input 2 character from keypad 4x4 to graphic lcd 12864?

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Hi guys,

I'm using Arduino sensor shield v5 for UNO board here and Graphic LCD 12864

Before I ask here, I had browsing about my problem, but still not working on my glcd :frowning:

I want to input 2 characters from my keypad 4x4 to graphic lcd

From my code below, when I pressed 2 or more character from keypad, on my glcd just show first character i'd input, second character doesn't show on it, when i pressed '#', "tes" appear on my glcd.

But in serial monitor, every character I'd pressed were appear

So my question is, how to display second character on my glcd?

Here is my code

#include <Keypad.h>
#include "U8glib.h"

U8GLIB_ST7920_128X64_4X u8g(8, 9, 10, 11, 4, 5, 6, 7, A4, A3, A2);   // 8Bit Com: D0..D7: 8,9,10,11,4,5,6,7 en=18, di=17,rw=16

const byte ROWS = 4;
const byte COLS = 4;
char keymap[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad( makeKeymap(keymap), rowPins, colPins, ROWS, COLS );

volatile int firstnumber = 99;
volatile int secondnumber = 99;

char key;  // key should be a global variable, written in "loop()" and read in "draw()"
char key2;

char num1 = 99;                       //variable for compare that num1 & num2 were store
char num2 = 99;

void u8g_prepare(void) {
  u8g.setFont(u8g_font_6x10);
  u8g.setFontRefHeightExtendedText();
  u8g.setDefaultForegroundColor();
  u8g.setFontPosTop();
}

void draw2() {
  u8g_prepare();
  num1 = key;
  delay(200);
  if (num1 == '#') {                    //'#' for exit
    num1 = ' ';                         // to clear num1
    Serial.println("tes");
    u8g.drawStr(0, 10, "tes ");
    //u8g.setPrintPos(35, 0);
    //u8g.print("tes");
  } else {
    if (num1 == 99) {                   //compare, num1 was inputted or not
      num1 = key;
      Serial.println(key);
      char buf [2];
      sprintf(buf, "%c", key);
      u8g.drawStr(0, 10, buf);
    }
  }

}

void setup() {
  Serial.begin(9600);
  keypad.setHoldTime(250);
  keypad.setDebounceTime(100);
}


void in() {                                           //void for input from keypad
  key = keypad.getKey();

  if (key != NO_KEY) {
    u8g.firstPage();
    do {
      draw2();
    }
    while ( u8g.nextPage() );
  }
}

void loop() {
  in();
}