// stores the 16 bytes data to be written in a block:
blockData writeData = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
                       0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F};
// stores the 16 bytes data read from a block:
blockData readData;
// stores the key or password:
uint8_t keyAccess[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
// stores the block address:
uint8_t address = 0x04;
// stores the UID (unique identifier) of a card:
CardIdentifier CardID;
// stores the answer to request:
uint8_t ATQ[2];
 
 
 
void setup()
{
  USB.begin();
  USB.println("RFID/NFC @ 13.56 MHz module started");
  // switchs on the RFID/NFC @ 13.56 MHz module, type B, and asigns the socket
  RFID13.ON(SOCKET0, B);
  delay(1000);
}
 
 
 
void loop()
{
  USB.print("\n");
  USB.println("Ready to read...");
   
  // get the UID
  RFID13.init(CardID, ATQ);
  USB.print("\n");
  USB.print("the Card UID: ");
  RFID13.print(CardID, 4);
  // auntenticate block number 4 with its access key (2nd sector)
  if (!RFID13.authenticateBlock(address, keyAccess))
  {
    USB.println("Authentication failed");
  }
  else  // success
  {
    USB.println("Authentication OK");
    // after authentication, write blockData in the block
    if (!RFID13.writeData(address, writeData))
    {
      USB.println("Write failed");
    }
    else  // success
    {
      USB.println("Write block OK");
      // read from address after write
      if (!RFID13.readData(address, readData))
      {
        USB.println("Read failed");
      }
      else  // success
      {
        USB.println("Read block OK");
        USB.print("Data read: ");
        RFID13.print(readData, 16);
      }
    }
  }
  USB.print("\n");
  delay(1000); // wait some time each loop
}

// stores the status of the executed command:
short state;
// auxiliar buffer:
unsigned char aux[16];
// stores the UID (unique identifier) of a card:
unsigned char CardID[4];
// stores the key or password:
unsigned char keyAccess[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
 
 
 
void setup()
{
  USB.begin();
  USB.println("NFC @ 13.56 MHz module started");
   
  // switchs on the module, type B, and asigns the socket
  RFID13.ON(SOCKET0, B);
  delay(1000);
}
 
 
 
void loop()
{
  USB.print("\r\n++++++++++++++++++++++++++++++++++++");
  // **** init the RFID reader
  state = RFID13.init(CardID, aux);
  if (aux[0] == aux[1])  // if so, there is no card on the EM field
  {
    USB.print("\r\nRequest error-no card found");
  }
  else  // a card was found
  {
    USB.print("\r\nRequest|Answer: ");
    RFID13.print(aux, 2); // show the ATQ
     
    USB.print("\r\nAnticollSelect: ");
    USB.print(state, HEX); // show the status of the executed init command (should be 0)
    USB .print("|Answer: ");
     
    // show the UID (Unique IDentifier) of the read card (4 bytes)
    RFID13.print(CardID, 16);
     
    // we will do the same actions in blocks from 0 to 3 (which is sector 1)
    for (int n=0; n< 64; n++)
    {
      // **** authenticate the key A of each sector
      if (n % 4 == 0) // only one authentication per sector is needed
      {
        state = RFID13.authenticate(CardID, n , keyAccess); // it is supposed all the blocks have the same key
        USB.print("\r\nAuthentication block");
        USB.print(n, DEC); // show the number of the block [n = 0..63 in a 1 kB RFID card]
        USB.print(": ");
        USB.print(state, HEX); // show the state of the executed authentication command
        delay(1);
      }
      // **** if passed authentication in the sector, we will be able to read the data in its blocks
      state = RFID13.readData(n, aux);
      USB.print("\r\nRead block ");
      USB.print(n, DEC); // show the number of the block [n = 0..63]
      USB.print(": ");
      USB.print(state, HEX); // show the state of the executed read command
      USB.print("   ");
       
      if (state == 0) // if the read command was successful, we show the data (16 bytes)
      {
        USB.print(" | ");
        for (int i=0; i< 16; i++)
        {
          if (aux[i] <=  B01111)
          {
            USB.print(" ");
          }
          USB.print(aux[i], HEX); // print the 16 bytes of the block 'n'
          USB.print(" ");
        }
        USB.print("  ");
        if (n==0)
          USB.print("<--UID(first 4 bytes)");
        else if (((n+1) % 4) == 0)
          USB.print("<--Trailer block");
      }
      delay(1);
    }
    USB.println();
  }
  delay(500); // wait 1 second in each loop
}