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	- Project: "RFID Identification"
	- Source Code NOT compiled for: ESP32 DevKit V1
	- Source Code created on: 2024-06-12 22:54:58

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* Enhance the RFID system to assign a unique random */
	/* identifier to each new RFID tag detected using the */
	/* MFRC522 module. Ensure the identifier is stored */
	/* and displayed via serial communication for */
	/* verification. */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include 
#include  //https://github.com/miguelbalboa/rfid

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateOutputs(void);
void printHex(byte *buffer, byte bufferSize);
void printDec(byte *buffer, byte bufferSize);
void generateRandomIdentifier(byte *buffer, byte bufferSize);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t rfid_MFRC522_IRQ_PIN_D13 = 13;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t rfid_MFRC522_RST_PIN_D4 = 4;

/***** DEFINITION OF SPI PINS *****/
const uint8_t rfid_MFRC522_SPI_PIN_MOSI_D23 = 23;
const uint8_t rfid_MFRC522_SPI_PIN_MISO_D19 = 19;
const uint8_t rfid_MFRC522_SPI_PIN_SCLK_D18 = 18;
const uint8_t rfid_MFRC522_SPI_PIN_CS_D5 = 5;

/***** DEFINITION OF OUTPUT RAW VARIABLES *****/
/***** used to store raw data *****/
bool rfid_MFRC522_RST_PIN_D4_rawData = 0;

/***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/
/***** used to store data after characteristic curve transformation *****/
float rfid_MFRC522_RST_PIN_D4_phyData = 0.0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
MFRC522 rfid(rfid_MFRC522_SPI_PIN_CS_D5, rfid_MFRC522_RST_PIN_D4); // Instance of the class
MFRC522::MIFARE_Key key; // Key instance

byte nuidPICC[4]; // Array to store new NUID
byte uniqueID[4]; // Array to store unique random identifier

void setup(void)
{
  // put your setup code here, to run once:
  Serial.begin(9600); // Initialize serial communication
  pinMode(rfid_MFRC522_IRQ_PIN_D13, INPUT_PULLUP);
  pinMode(rfid_MFRC522_RST_PIN_D4, OUTPUT);
  pinMode(rfid_MFRC522_SPI_PIN_CS_D5, OUTPUT);

  // start the SPI library:
  SPI.begin();
  rfid.PCD_Init(); // Init MFRC522

  for (byte i = 0; i < 6; i++) {
    key.keyByte[i] = 0xFF;
  }

  Serial.println(F("This code scans the MIFARE Classic NUID."));
  Serial.print(F("Using the following key:"));
  printHex(key.keyByte, MFRC522::MF_KEY_SIZE);

  // Seed the random number generator
  randomSeed(analogRead(0));
}

void loop(void)
{
  // put your main code here, to run repeatedly:
  updateOutputs(); // Refresh output data

  if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) return;

  Serial.print(F("PICC type: "));
  MFRC522::PICC_Type piccType = rfid.PICC_GetType(rfid.uid.sak);
  Serial.println(rfid.PICC_GetTypeName(piccType));

  if (piccType != MFRC522::PICC_TYPE_MIFARE_MINI &&
      piccType != MFRC522::PICC_TYPE_MIFARE_1K &&
      piccType != MFRC522::PICC_TYPE_MIFARE_4K) {
    Serial.println(F("Your tag is not of type MIFARE Classic."));
    return;
  }

  if (memcmp(rfid.uid.uidByte, nuidPICC, 4) != 0) {
    Serial.println(F("A new card has been detected."));
    memcpy(nuidPICC, rfid.uid.uidByte, 4);

    Serial.println(F("The NUID tag is:"));
    Serial.print(F("In hex: "));
    printHex(rfid.uid.uidByte, rfid.uid.size);
    Serial.println();
    Serial.print(F("In dec: "));
    printDec(rfid.uid.uidByte, rfid.uid.size);
    Serial.println();

    // Generate and display a unique random identifier for the new card
    generateRandomIdentifier(uniqueID, 4);
    Serial.println(F("Assigned unique identifier:"));
    Serial.print(F("In hex: "));
    printHex(uniqueID, 4);
    Serial.println();
    Serial.print(F("In dec: "));
    printDec(uniqueID, 4);
    Serial.println();
  } else {
    Serial.println(F("Card read previously."));
  }

  rfid.PICC_HaltA(); // Halt PICC
  rfid.PCD_StopCrypto1(); // Stop encryption on PCD
}

void updateOutputs()
{
  digitalWrite(rfid_MFRC522_RST_PIN_D4, rfid_MFRC522_RST_PIN_D4_rawData);
}

void printHex(byte *buffer, byte bufferSize) {
  for (byte i = 0; i < bufferSize; i++) {
    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
    Serial.print(buffer[i], HEX);
  }
}

void printDec(byte *buffer, byte bufferSize) {
  for (byte i = 0; i < bufferSize; i++) {
    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
    Serial.print(buffer[i], DEC);
  }
}

void generateRandomIdentifier(byte *buffer, byte bufferSize) {
  for (byte i = 0; i < bufferSize; i++) {
    buffer[i] = random(0, 256); // Generate a random byte
  }
}

/* END CODE */