/* STM32 Blue Pill project using the STM32 Arduino Core (stm32duino) */

#include <I2CKeyPad.h>
#include <LiquidCrystal_I2C.h>

#define deltaTime(val) (millis() - val)

I2CKeyPad keyPad(0x3F);
char keypad_layout[19] = "123A456B789C*0#D"; // N = NO_KEY, F = FAILED

LiquidCrystal_I2C lcd(0x27, 16, 2); // Change 0x27 to the correct I2C address for your LCD

// Just to avoid spamming
unsigned long lastKeyPress = 0;
unsigned long keyDelay = 200;




int Wire_Scanner(int Except)
{
    int I2C_Address = 0;
    for (I2C_Address = 0; I2C_Address < 128; I2C_Address++)
    {
        if(I2C_Address != Except)
        {
            Wire.beginTransmission(I2C_Address);
            if (Wire.endTransmission() == 0)
            {
               // Serial1.print("\r\n ==== WIRE I2C_Address : ");  Serial1.print(I2C_Address, HEX);
                delay(1);
                break;
            }
        }
    }
    return I2C_Address;
}



void setup() {

  Serial.begin(4800);

  pinMode(PA8, OUTPUT);
  digitalWrite(PA8, 1);
  Serial.print("\n ======= System Started =======\n");

   int First_Value = Wire_Scanner(0);
   Serial1.print("\n ==== First_Value : ");Serial1.print(First_Value , HEX);

   int Second_Value = Wire_Scanner(First_Value);
   Serial1.print("\n ==== Second_Value : ");Serial1.print(Second_Value , HEX);

  lcd.init();
  lcd.backlight(); // You can remove this line if your LCD doesn't have backlight control
  lcd.setCursor(0, 0);
  lcd.print("Press a key:");
  Serial.print("\n ======= Press a key: =======\n");
  
  if (!keyPad.begin()) 
  {
    Serial.print("Cannot connect to I2C keypad.\n");
    
  }
  Serial.print("=== Before keyPad.loadKeyMap .\n");
  keyPad.loadKeyMap(keypad_layout);
  Serial.print("=== After keyPad.loadKeyMap .\n");

 
}

void loop() 
{
  if (keyPad.isPressed() && deltaTime(lastKeyPress) > keyDelay) {
    lastKeyPress = millis();
    char ch = keyPad.getChar();
    Serial.print("\n ==> Pressed: ");
    Serial.print(ch , HEX);
    lcd.setCursor(0, 1);
    lcd.print("Pressed: ");
    lcd.print(ch , HEX);
  }

  // Makes the code run faster
  delay(10);
}