#include <LiquidCrystal.h>
#include <Keypad.h>

// Initialize LCD (RS, EN, D4, D5, D6, D7)
LiquidCrystal lcd(PB0, PB1, PB10, PB11, PB12, PB13);

const byte ROWS = 4;
const byte COLS = 4;

// Define keypad layout
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

// Define row and column pins
byte rowPins[ROWS] = {PA0,PA1,PA2,PA3};
byte colPins[COLS] = {PA4, PA5, PA6, PA7};

// Create keypad object
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup() {
  lcd.begin(16, 2);
  lcd.print("STM32 Keypad AND LCD");
  delay(1000);
  lcd.clear();
}

void loop() {
  char key = keypad.getKey(); // Read key pressed
  if (key) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Key Pressed:");
    lcd.setCursor(0, 1);
    lcd.print(key);
  }
}