// STM32 Nucleo-C031C6 I2C Example
// Simulation: https://wokwi.com/projects/365421666018061313

#include "LiquidCrystal_I2C.h"
#include <Keypad.h>
#include <Stepper.h>


#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);


const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 7, 6, 5, 4 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 13, 12, 11, 10 }; // Pins connected to R1, R2, R3, R4

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


const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
Stepper myStepper(stepsPerRevolution, A0, A1, A2, A3);

int floor_num = 2;
int target = 3;

void setup() {
  Serial.begin(115200);
  Serial.println("Hello, STM32!");

  lcd.init();
  lcd.backlight();

  myStepper.setSpeed(50);
}

char password[4] = {'1', '2', '3', '4'};
int idx = 0;
char userPass[4];

void loop() {
  lcd.setCursor(0, 0);
  int c = 0;
  while(int i = 0) {
    char key = keypad.getKey();
    lcd.setCursor(0, c);
    lcd.print(key);
    c = c + 1;
    if (key != NO_KEY) {
      userPass[idx] = key;
      if (userPass[idx] == password[idx]) {
        idx = idx + 1;
        if (idx == 4) {
          Serial.println("Correct");
        }
        continue;
      }
      Serial.println("error");
      break;
    }
  }
}