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diff --git a/test/Adafruit_PN532.cpp b/test/Adafruit_PN532.cpp
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-/**************************************************************************/
-/*!
-    @file Adafruit_PN532.cpp
-
-    @section intro_sec Introduction
-
-    Driver for NXP's PN532 NFC/13.56MHz RFID Transceiver
-
-    This is a library for the Adafruit PN532 NFC/RFID breakout boards
-    This library works with the Adafruit NFC breakout
-    ----> https://www.adafruit.com/products/364
-
-    Check out the links above for our tutorials and wiring diagrams
-    These chips use SPI or I2C to communicate.
-
-    Adafruit invests time and resources providing this open source code,
-    please support Adafruit and open-source hardware by purchasing
-    products from Adafruit!
-
-    @section author Author
-
-    Adafruit Industries
-
-    @section license License
-
-    BSD (see license.txt)
-
-    @section  HISTORY
-
-    v2.2 - Added startPassiveTargetIDDetection() to start card detection and
-            readDetectedPassiveTargetID() to read it, useful when using the
-            IRQ pin.
-
-    v2.1 - Added NTAG2xx helper functions
-
-    v2.0 - Refactored to add I2C support from Adafruit_NFCShield_I2C library.
-
-    v1.4 - Added setPassiveActivationRetries()
-
-    v1.2 - Added writeGPIO()
-         - Added readGPIO()
-
-    v1.1 - Changed readPassiveTargetID() to handle multiple UID sizes
-         - Added the following helper functions for text display
-             static void PrintHex(const byte * data, const uint32_t numBytes)
-             static void PrintHexChar(const byte * pbtData, const uint32_t
-   numBytes)
-         - Added the following Mifare Classic functions:
-             bool mifareclassic_IsFirstBlock (uint32_t uiBlock)
-             bool mifareclassic_IsTrailerBlock (uint32_t uiBlock)
-             uint8_t mifareclassic_AuthenticateBlock (uint8_t * uid, uint8_t
-   uidLen, uint32_t blockNumber, uint8_t keyNumber, uint8_t * keyData) uint8_t
-   mifareclassic_ReadDataBlock (uint8_t blockNumber, uint8_t * data) uint8_t
-   mifareclassic_WriteDataBlock (uint8_t blockNumber, uint8_t * data)
-         - Added the following Mifare Ultalight functions:
-             uint8_t mifareultralight_ReadPage (uint8_t page, uint8_t * buffer)
-*/
-/**************************************************************************/
-
-#include "Adafruit_PN532.h"
-
-byte pn532ack[] = {0x00, 0x00, 0xFF,
-                   0x00, 0xFF, 0x00}; ///< ACK message from PN532
-byte pn532response_firmwarevers[] = {
-    0x00, 0x00, 0xFF,
-    0x06, 0xFA, 0xD5}; ///< Expected firmware version message from PN532
-
-// Uncomment these lines to enable debug output for PN532(SPI) and/or MIFARE
-// related code
-
-// #define PN532DEBUG
-// #define MIFAREDEBUG
-
-// If using Native Port on Arduino Zero or Due define as SerialUSB
-#define PN532DEBUGPRINT Serial ///< Fixed name for debug Serial instance
-// #define PN532DEBUGPRINT SerialUSB ///< Fixed name for debug Serial instance
-
-#define PN532_PACKBUFFSIZ 64                ///< Packet buffer size in bytes
-byte pn532_packetbuffer[PN532_PACKBUFFSIZ]; ///< Packet buffer used in various
-                                            ///< transactions
-
-/**************************************************************************/
-/*!
-    @brief  Instantiates a new PN532 class using software SPI.
-
-    @param  clk       SPI clock pin (SCK)
-    @param  miso      SPI MISO pin
-    @param  mosi      SPI MOSI pin
-    @param  ss        SPI chip select pin (CS/SSEL)
-*/
-/**************************************************************************/
-Adafruit_PN532::Adafruit_PN532(uint8_t clk, uint8_t miso, uint8_t mosi,
-                               uint8_t ss) {
-  _cs = ss;
-  spi_dev = new Adafruit_SPIDevice(ss, clk, miso, mosi, 1000000,
-                                   SPI_BITORDER_LSBFIRST, SPI_MODE0);
-}
-
-/**************************************************************************/
-/*!
-    @brief  Instantiates a new PN532 class using I2C.
-
-    @param  irq       Location of the IRQ pin
-    @param  reset     Location of the RSTPD_N pin
-    @param  theWire   pointer to I2C bus to use
-*/
-/**************************************************************************/
-Adafruit_PN532::Adafruit_PN532(uint8_t irq, uint8_t reset, TwoWire *theWire)
-    : _irq(irq), _reset(reset) {
-  pinMode(_irq, INPUT);
-  pinMode(_reset, OUTPUT);
-  i2c_dev = new Adafruit_I2CDevice(PN532_I2C_ADDRESS, theWire);
-}
-
-/**************************************************************************/
-/*!
-    @brief  Instantiates a new PN532 class using hardware SPI.
-
-    @param  ss        SPI chip select pin (CS/SSEL)
-    @param  theSPI    pointer to the SPI bus to use
-*/
-/**************************************************************************/
-Adafruit_PN532::Adafruit_PN532(uint8_t ss, SPIClass *theSPI) {
-  _cs = ss;
-  spi_dev = new Adafruit_SPIDevice(ss, 1000000, SPI_BITORDER_LSBFIRST,
-                                   SPI_MODE0, theSPI);
-}
-
-/**************************************************************************/
-/*!
-    @brief  Instantiates a new PN532 class using hardware UART (HSU).
-
-    @param  reset     Location of the RSTPD_N pin
-    @param  theSer    pointer to HardWare Serial bus to use
-*/
-/**************************************************************************/
-Adafruit_PN532::Adafruit_PN532(uint8_t reset, HardwareSerial *theSer)
-    : _reset(reset) {
-  pinMode(_reset, OUTPUT);
-  ser_dev = theSer;
-}
-
-/**************************************************************************/
-/*!
-    @brief  Setups the HW
-
-    @returns  true if successful, otherwise false
-*/
-/**************************************************************************/
-bool Adafruit_PN532::begin() {
-  if (spi_dev) {
-    // SPI initialization
-    if (!spi_dev->begin()) {
-      return false;
-    }
-  } else if (i2c_dev) {
-    // I2C initialization
-    // PN532 will fail address check since its asleep, so suppress
-    if (!i2c_dev->begin(false)) {
-      return false;
-    }
-  } else if (ser_dev) {
-    ser_dev->begin(115200);
-    // clear out anything in read buffer
-    while (ser_dev->available())
-      ser_dev->read();
-  } else {
-    // no interface specified
-    return false;
-  }
-  reset(); // HW reset - put in known state
-  delay(10);
-  wakeup(); // hey! wakeup!
-  return true;
-}
-
-/**************************************************************************/
-/*!
-    @brief  Perform a hardware reset. Requires reset pin to have been provided.
-*/
-/**************************************************************************/
-void Adafruit_PN532::reset(void) {
-  // see Datasheet p.209, Fig.48 for timings
-  if (_reset != -1) {
-    digitalWrite(_reset, LOW);
-    delay(1); // min 20ns
-    digitalWrite(_reset, HIGH);
-    delay(2); // max 2ms
-  }
-}
-
-/**************************************************************************/
-/*!
-    @brief  Wakeup from LowVbat mode into Normal Mode.
-*/
-/**************************************************************************/
-void Adafruit_PN532::wakeup(void) {
-  // interface specific wakeups - each one is unique!
-  if (spi_dev) {
-    // hold CS low for 2ms
-    digitalWrite(_cs, LOW);
-    delay(2);
-  } else if (ser_dev) {
-    uint8_t w[3] = {0x55, 0x00, 0x00};
-    ser_dev->write(w, 3);
-    delay(2);
-  }
-
-  // PN532 will clock stretch I2C during SAMConfig as a "wakeup"
-
-  // need to config SAM to stay in Normal Mode
-  SAMConfig();
-}
-
-/**************************************************************************/
-/*!
-    @brief  Prints a hexadecimal value in plain characters
-
-    @param  data      Pointer to the byte data
-    @param  numBytes  Data length in bytes
-*/
-/**************************************************************************/
-void Adafruit_PN532::PrintHex(const byte *data, const uint32_t numBytes) {
-  uint32_t szPos;
-  for (szPos = 0; szPos < numBytes; szPos++) {
-    PN532DEBUGPRINT.print(F("0x"));
-    // Append leading 0 for small values
-    if (data[szPos] <= 0xF)
-      PN532DEBUGPRINT.print(F("0"));
-    PN532DEBUGPRINT.print(data[szPos] & 0xff, HEX);
-    if ((numBytes > 1) && (szPos != numBytes - 1)) {
-      PN532DEBUGPRINT.print(F(" "));
-    }
-  }
-  PN532DEBUGPRINT.println();
-}
-
-/**************************************************************************/
-/*!
-    @brief  Prints a hexadecimal value in plain characters, along with
-            the char equivalents in the following format
-
-            00 00 00 00 00 00  ......
-
-    @param  data      Pointer to the byte data
-    @param  numBytes  Data length in bytes
-*/
-/**************************************************************************/
-void Adafruit_PN532::PrintHexChar(const byte *data, const uint32_t numBytes) {
-  uint32_t szPos;
-  for (szPos = 0; szPos < numBytes; szPos++) {
-    // Append leading 0 for small values
-    if (data[szPos] <= 0xF)
-      PN532DEBUGPRINT.print(F("0"));
-    PN532DEBUGPRINT.print(data[szPos], HEX);
-    if ((numBytes > 1) && (szPos != numBytes - 1)) {
-      PN532DEBUGPRINT.print(F(" "));
-    }
-  }
-  PN532DEBUGPRINT.print(F("  "));
-  for (szPos = 0; szPos < numBytes; szPos++) {
-    if (data[szPos] <= 0x1F)
-      PN532DEBUGPRINT.print(F("."));
-    else
-      PN532DEBUGPRINT.print((char)data[szPos]);
-  }
-  PN532DEBUGPRINT.println();
-}
-
-/**************************************************************************/
-/*!
-    @brief  Checks the firmware version of the PN5xx chip
-
-    @returns  The chip's firmware version and ID
-*/
-/**************************************************************************/
-uint32_t Adafruit_PN532::getFirmwareVersion(void) {
-  uint32_t response;
-
-  pn532_packetbuffer[0] = PN532_COMMAND_GETFIRMWAREVERSION;
-
-  if (!sendCommandCheckAck(pn532_packetbuffer, 1)) {
-    return 0;
-  }
-
-  // read data packet
-  readdata(pn532_packetbuffer, 13);
-
-  // check some basic stuff
-  if (0 != memcmp((char *)pn532_packetbuffer,
-                  (char *)pn532response_firmwarevers, 6)) {
-#ifdef PN532DEBUG
-    PN532DEBUGPRINT.println(F("Firmware doesn't match!"));
-#endif
-    return 0;
-  }
-
-  int offset = 7;
-  response = pn532_packetbuffer[offset++];
-  response <<= 8;
-  response |= pn532_packetbuffer[offset++];
-  response <<= 8;
-  response |= pn532_packetbuffer[offset++];
-  response <<= 8;
-  response |= pn532_packetbuffer[offset++];
-
-  return response;
-}
-
-/**************************************************************************/
-/*!
-    @brief  Sends a command and waits a specified period for the ACK
-
-    @param  cmd       Pointer to the command buffer
-    @param  cmdlen    The size of the command in bytes
-    @param  timeout   timeout before giving up
-
-    @returns  1 if everything is OK, 0 if timeout occured before an
-              ACK was recieved
-*/
-/**************************************************************************/
-// default timeout of one second
-bool Adafruit_PN532::sendCommandCheckAck(uint8_t *cmd, uint8_t cmdlen,
-                                         uint16_t timeout) {
-
-  // I2C works without using IRQ pin by polling for RDY byte
-  // seems to work best with some delays between transactions
-  uint8_t SLOWDOWN = 0;
-  if (i2c_dev || spi_dev) // SPI and I2C need 1ms slow for page reads
-    SLOWDOWN = 1;
-
-  // write the command
-  writecommand(cmd, cmdlen);
-
-  // I2C TUNING
-  delay(SLOWDOWN);
-
-  // Wait for chip to say its ready!
-  if (!waitready(timeout)) {
-    return false;
-  }
-
-#ifdef PN532DEBUG
-  if (spi_dev == NULL) {
-    PN532DEBUGPRINT.println(F("IRQ received"));
-  }
-#endif
-
-  // read acknowledgement
-  if (!readack()) {
-#ifdef PN532DEBUG
-    PN532DEBUGPRINT.println(F("No ACK frame received!"));
-#endif
-    return false;
-  }
-
-  // I2C TUNING
-  delay(SLOWDOWN);
-
-  // Wait for chip to say its ready!
-  if (!waitready(timeout)) {
-    return false;
-  }
-
-  return true; // ack'd command
-}
-
-/**************************************************************************/
-/*!
-    @brief   Writes an 8-bit value that sets the state of the PN532's GPIO
-             pins.
-    @param   pinstate  P3 pins state.
-
-    @warning This function is provided exclusively for board testing and
-             is dangerous since it will throw an error if any pin other
-             than the ones marked "Can be used as GPIO" are modified!  All
-             pins that can not be used as GPIO should ALWAYS be left high
-             (value = 1) or the system will become unstable and a HW reset
-             will be required to recover the PN532.
-
-             pinState[0]  = P30     Can be used as GPIO
-             pinState[1]  = P31     Can be used as GPIO
-             pinState[2]  = P32     *** RESERVED (Must be 1!) ***
-             pinState[3]  = P33     Can be used as GPIO
-             pinState[4]  = P34     *** RESERVED (Must be 1!) ***
-             pinState[5]  = P35     Can be used as GPIO
-
-    @return  1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-bool Adafruit_PN532::writeGPIO(uint8_t pinstate) {
-  // uint8_t errorbit;
-
-  // Make sure pinstate does not try to toggle P32 or P34
-  pinstate |= (1 << PN532_GPIO_P32) | (1 << PN532_GPIO_P34);
-
-  // Fill command buffer
-  pn532_packetbuffer[0] = PN532_COMMAND_WRITEGPIO;
-  pn532_packetbuffer[1] = PN532_GPIO_VALIDATIONBIT | pinstate; // P3 Pins
-  pn532_packetbuffer[2] = 0x00; // P7 GPIO Pins (not used ... taken by SPI)
-
-#ifdef PN532DEBUG
-  PN532DEBUGPRINT.print(F("Writing P3 GPIO: "));
-  PN532DEBUGPRINT.println(pn532_packetbuffer[1], HEX);
-#endif
-
-  // Send the WRITEGPIO command (0x0E)
-  if (!sendCommandCheckAck(pn532_packetbuffer, 3))
-    return 0x0;
-
-  // Read response packet (00 FF PLEN PLENCHECKSUM D5 CMD+1(0x0F) DATACHECKSUM
-  // 00)
-  readdata(pn532_packetbuffer, 8);
-
-#ifdef PN532DEBUG
-  PN532DEBUGPRINT.print(F("Received: "));
-  PrintHex(pn532_packetbuffer, 8);
-  PN532DEBUGPRINT.println();
-#endif
-
-  int offset = 6;
-  return (pn532_packetbuffer[offset] == 0x0F);
-}
-
-/**************************************************************************/
-/*!
-    Reads the state of the PN532's GPIO pins
-
-    @returns An 8-bit value containing the pin state where:
-
-             pinState[0]  = P30
-             pinState[1]  = P31
-             pinState[2]  = P32
-             pinState[3]  = P33
-             pinState[4]  = P34
-             pinState[5]  = P35
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::readGPIO(void) {
-  pn532_packetbuffer[0] = PN532_COMMAND_READGPIO;
-
-  // Send the READGPIO command (0x0C)
-  if (!sendCommandCheckAck(pn532_packetbuffer, 1))
-    return 0x0;
-
-  // Read response packet (00 FF PLEN PLENCHECKSUM D5 CMD+1(0x0D) P3 P7 IO1
-  // DATACHECKSUM 00)
-  readdata(pn532_packetbuffer, 11);
-
-  /* READGPIO response should be in the following format:
-
-    byte            Description
-    -------------   ------------------------------------------
-    b0..5           Frame header and preamble (with I2C there is an extra 0x00)
-    b6              P3 GPIO Pins
-    b7              P7 GPIO Pins (not used ... taken by SPI)
-    b8              Interface Mode Pins (not used ... bus select pins)
-    b9..10          checksum */
-
-  int p3offset = 7;
-
-#ifdef PN532DEBUG
-  PN532DEBUGPRINT.print(F("Received: "));
-  PrintHex(pn532_packetbuffer, 11);
-  PN532DEBUGPRINT.println();
-  PN532DEBUGPRINT.print(F("P3 GPIO: 0x"));
-  PN532DEBUGPRINT.println(pn532_packetbuffer[p3offset], HEX);
-  PN532DEBUGPRINT.print(F("P7 GPIO: 0x"));
-  PN532DEBUGPRINT.println(pn532_packetbuffer[p3offset + 1], HEX);
-  PN532DEBUGPRINT.print(F("IO GPIO: 0x"));
-  PN532DEBUGPRINT.println(pn532_packetbuffer[p3offset + 2], HEX);
-  // Note: You can use the IO GPIO value to detect the serial bus being used
-  switch (pn532_packetbuffer[p3offset + 2]) {
-  case 0x00: // Using UART
-    PN532DEBUGPRINT.println(F("Using UART (IO = 0x00)"));
-    break;
-  case 0x01: // Using I2C
-    PN532DEBUGPRINT.println(F("Using I2C (IO = 0x01)"));
-    break;
-  case 0x02: // Using SPI
-    PN532DEBUGPRINT.println(F("Using SPI (IO = 0x02)"));
-    break;
-  }
-#endif
-
-  return pn532_packetbuffer[p3offset];
-}
-
-/**************************************************************************/
-/*!
-    @brief   Configures the SAM (Secure Access Module)
-    @return  true on success, false otherwise.
-*/
-/**************************************************************************/
-bool Adafruit_PN532::SAMConfig(void) {
-  pn532_packetbuffer[0] = PN532_COMMAND_SAMCONFIGURATION;
-  pn532_packetbuffer[1] = 0x01; // normal mode;
-  pn532_packetbuffer[2] = 0x14; // timeout 50ms * 20 = 1 second
-  pn532_packetbuffer[3] = 0x01; // use IRQ pin!
-
-  if (!sendCommandCheckAck(pn532_packetbuffer, 4))
-    return false;
-
-  // read data packet
-  readdata(pn532_packetbuffer, 9);
-
-  int offset = 6;
-  return (pn532_packetbuffer[offset] == 0x15);
-}
-
-/**************************************************************************/
-/*!
-    Sets the MxRtyPassiveActivation byte of the RFConfiguration register
-
-    @param  maxRetries    0xFF to wait forever, 0x00..0xFE to timeout
-                          after mxRetries
-
-    @returns 1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-bool Adafruit_PN532::setPassiveActivationRetries(uint8_t maxRetries) {
-  pn532_packetbuffer[0] = PN532_COMMAND_RFCONFIGURATION;
-  pn532_packetbuffer[1] = 5;    // Config item 5 (MaxRetries)
-  pn532_packetbuffer[2] = 0xFF; // MxRtyATR (default = 0xFF)
-  pn532_packetbuffer[3] = 0x01; // MxRtyPSL (default = 0x01)
-  pn532_packetbuffer[4] = maxRetries;
-
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Setting MxRtyPassiveActivation to "));
-  PN532DEBUGPRINT.print(maxRetries, DEC);
-  PN532DEBUGPRINT.println(F(" "));
-#endif
-
-  if (!sendCommandCheckAck(pn532_packetbuffer, 5))
-    return 0x0; // no ACK
-
-  return 1;
-}
-
-/***** ISO14443A Commands ******/
-
-/**************************************************************************/
-/*!
-    @brief   Waits for an ISO14443A target to enter the field and reads
-             its ID.
-
-    @param   cardbaudrate  Baud rate of the card
-    @param   uid           Pointer to the array that will be populated
-                           with the card's UID (up to 7 bytes)
-    @param   uidLength     Pointer to the variable that will hold the
-                           length of the card's UID.
-    @param   timeout       Timeout in milliseconds.
-
-    @return  1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-bool Adafruit_PN532::readPassiveTargetID(uint8_t cardbaudrate, uint8_t *uid,
-                                         uint8_t *uidLength, uint16_t timeout) {
-  pn532_packetbuffer[0] = PN532_COMMAND_INLISTPASSIVETARGET;
-  pn532_packetbuffer[1] = 1; // max 1 cards at once (we can set this to 2 later)
-  pn532_packetbuffer[2] = cardbaudrate;
-
-  if (!sendCommandCheckAck(pn532_packetbuffer, 3, timeout)) {
-#ifdef PN532DEBUG
-    PN532DEBUGPRINT.println(F("No card(s) read"));
-#endif
-    return 0x0; // no cards read
-  }
-
-  return readDetectedPassiveTargetID(uid, uidLength);
-}
-
-/**************************************************************************/
-/*!
-    @brief   Put the reader in detection mode, non blocking so interrupts
-             must be enabled.
-    @param   cardbaudrate  Baud rate of the card
-    @return  1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-bool Adafruit_PN532::startPassiveTargetIDDetection(uint8_t cardbaudrate) {
-  pn532_packetbuffer[0] = PN532_COMMAND_INLISTPASSIVETARGET;
-  pn532_packetbuffer[1] = 1; // max 1 cards at once (we can set this to 2 later)
-  pn532_packetbuffer[2] = cardbaudrate;
-
-  return sendCommandCheckAck(pn532_packetbuffer, 3);
-}
-
-/**************************************************************************/
-/*!
-    Reads the ID of the passive target the reader has deteceted.
-
-    @param  uid           Pointer to the array that will be populated
-                          with the card's UID (up to 7 bytes)
-    @param  uidLength     Pointer to the variable that will hold the
-                          length of the card's UID.
-
-    @returns 1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-bool Adafruit_PN532::readDetectedPassiveTargetID(uint8_t *uid,
-                                                 uint8_t *uidLength) {
-  // read data packet
-  readdata(pn532_packetbuffer, 20);
-  // check some basic stuff
-
-  /* ISO14443A card response should be in the following format:
-
-    byte            Description
-    -------------   ------------------------------------------
-    b0..6           Frame header and preamble
-    b7              Tags Found
-    b8              Tag Number (only one used in this example)
-    b9..10          SENS_RES
-    b11             SEL_RES
-    b12             NFCID Length
-    b13..NFCIDLen   NFCID                                      */
-
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Found "));
-  PN532DEBUGPRINT.print(pn532_packetbuffer[7], DEC);
-  PN532DEBUGPRINT.println(F(" tags"));
-#endif
-  if (pn532_packetbuffer[7] != 1)
-    return 0;
-
-  uint16_t sens_res = pn532_packetbuffer[9];
-  sens_res <<= 8;
-  sens_res |= pn532_packetbuffer[10];
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("ATQA: 0x"));
-  PN532DEBUGPRINT.println(sens_res, HEX);
-  PN532DEBUGPRINT.print(F("SAK: 0x"));
-  PN532DEBUGPRINT.println(pn532_packetbuffer[11], HEX);
-#endif
-
-  /* Card appears to be Mifare Classic */
-  *uidLength = pn532_packetbuffer[12];
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("UID:"));
-#endif
-  for (uint8_t i = 0; i < pn532_packetbuffer[12]; i++) {
-    uid[i] = pn532_packetbuffer[13 + i];
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.print(F(" 0x"));
-    PN532DEBUGPRINT.print(uid[i], HEX);
-#endif
-  }
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.println();
-#endif
-
-  return 1;
-}
-
-/**************************************************************************/
-/*!
-    @brief   Exchanges an APDU with the currently inlisted peer
-
-    @param   send            Pointer to data to send
-    @param   sendLength      Length of the data to send
-    @param   response        Pointer to response data
-    @param   responseLength  Pointer to the response data length
-    @return  true on success, false otherwise.
-*/
-/**************************************************************************/
-bool Adafruit_PN532::inDataExchange(uint8_t *send, uint8_t sendLength,
-                                    uint8_t *response,
-                                    uint8_t *responseLength) {
-  if (sendLength > PN532_PACKBUFFSIZ - 2) {
-#ifdef PN532DEBUG
-    PN532DEBUGPRINT.println(F("APDU length too long for packet buffer"));
-#endif
-    return false;
-  }
-  uint8_t i;
-
-  pn532_packetbuffer[0] = 0x40; // PN532_COMMAND_INDATAEXCHANGE;
-  pn532_packetbuffer[1] = _inListedTag;
-  for (i = 0; i < sendLength; ++i) {
-    pn532_packetbuffer[i + 2] = send[i];
-  }
-
-  if (!sendCommandCheckAck(pn532_packetbuffer, sendLength + 2, 1000)) {
-#ifdef PN532DEBUG
-    PN532DEBUGPRINT.println(F("Could not send APDU"));
-#endif
-    return false;
-  }
-
-  if (!waitready(1000)) {
-#ifdef PN532DEBUG
-    PN532DEBUGPRINT.println(F("Response never received for APDU..."));
-#endif
-    return false;
-  }
-
-  readdata(pn532_packetbuffer, sizeof(pn532_packetbuffer));
-
-  if (pn532_packetbuffer[0] == 0 && pn532_packetbuffer[1] == 0 &&
-      pn532_packetbuffer[2] == 0xff) {
-    uint8_t length = pn532_packetbuffer[3];
-    if (pn532_packetbuffer[4] != (uint8_t)(~length + 1)) {
-#ifdef PN532DEBUG
-      PN532DEBUGPRINT.println(F("Length check invalid"));
-      PN532DEBUGPRINT.println(length, HEX);
-      PN532DEBUGPRINT.println((~length) + 1, HEX);
-#endif
-      return false;
-    }
-    if (pn532_packetbuffer[5] == PN532_PN532TOHOST &&
-        pn532_packetbuffer[6] == PN532_RESPONSE_INDATAEXCHANGE) {
-      if ((pn532_packetbuffer[7] & 0x3f) != 0) {
-#ifdef PN532DEBUG
-        PN532DEBUGPRINT.println(F("Status code indicates an error"));
-#endif
-        return false;
-      }
-
-      length -= 3;
-
-      if (length > *responseLength) {
-        length = *responseLength; // silent truncation...
-      }
-
-      for (i = 0; i < length; ++i) {
-        response[i] = pn532_packetbuffer[8 + i];
-      }
-      *responseLength = length;
-
-      return true;
-    } else {
-      PN532DEBUGPRINT.print(F("Don't know how to handle this command: "));
-      PN532DEBUGPRINT.println(pn532_packetbuffer[6], HEX);
-      return false;
-    }
-  } else {
-    PN532DEBUGPRINT.println(F("Preamble missing"));
-    return false;
-  }
-}
-
-/**************************************************************************/
-/*!
-    @brief   'InLists' a passive target. PN532 acting as reader/initiator,
-             peer acting as card/responder.
-    @return  true on success, false otherwise.
-*/
-/**************************************************************************/
-bool Adafruit_PN532::inListPassiveTarget() {
-  pn532_packetbuffer[0] = PN532_COMMAND_INLISTPASSIVETARGET;
-  pn532_packetbuffer[1] = 1;
-  pn532_packetbuffer[2] = 0;
-
-#ifdef PN532DEBUG
-  PN532DEBUGPRINT.print(F("About to inList passive target"));
-#endif
-
-  if (!sendCommandCheckAck(pn532_packetbuffer, 3, 1000)) {
-#ifdef PN532DEBUG
-    PN532DEBUGPRINT.println(F("Could not send inlist message"));
-#endif
-    return false;
-  }
-
-  if (!waitready(30000)) {
-    return false;
-  }
-
-  readdata(pn532_packetbuffer, sizeof(pn532_packetbuffer));
-
-  if (pn532_packetbuffer[0] == 0 && pn532_packetbuffer[1] == 0 &&
-      pn532_packetbuffer[2] == 0xff) {
-    uint8_t length = pn532_packetbuffer[3];
-    if (pn532_packetbuffer[4] != (uint8_t)(~length + 1)) {
-#ifdef PN532DEBUG
-      PN532DEBUGPRINT.println(F("Length check invalid"));
-      PN532DEBUGPRINT.println(length, HEX);
-      PN532DEBUGPRINT.println((~length) + 1, HEX);
-#endif
-      return false;
-    }
-    if (pn532_packetbuffer[5] == PN532_PN532TOHOST &&
-        pn532_packetbuffer[6] == PN532_RESPONSE_INLISTPASSIVETARGET) {
-      if (pn532_packetbuffer[7] != 1) {
-#ifdef PN532DEBUG
-        PN532DEBUGPRINT.println(F("Unhandled number of targets inlisted"));
-#endif
-        PN532DEBUGPRINT.println(F("Number of tags inlisted:"));
-        PN532DEBUGPRINT.println(pn532_packetbuffer[7]);
-        return false;
-      }
-
-      _inListedTag = pn532_packetbuffer[8];
-      PN532DEBUGPRINT.print(F("Tag number: "));
-      PN532DEBUGPRINT.println(_inListedTag);
-
-      return true;
-    } else {
-#ifdef PN532DEBUG
-      PN532DEBUGPRINT.print(F("Unexpected response to inlist passive host"));
-#endif
-      return false;
-    }
-  } else {
-#ifdef PN532DEBUG
-    PN532DEBUGPRINT.println(F("Preamble missing"));
-#endif
-    return false;
-  }
-
-  return true;
-}
-
-/***** Mifare Classic Functions ******/
-
-/**************************************************************************/
-/*!
-    @brief   Indicates whether the specified block number is the first block
-             in the sector (block 0 relative to the current sector)
-    @param   uiBlock  Block number to test.
-    @return  true if first block, false otherwise.
-*/
-/**************************************************************************/
-bool Adafruit_PN532::mifareclassic_IsFirstBlock(uint32_t uiBlock) {
-  // Test if we are in the small or big sectors
-  if (uiBlock < 128)
-    return ((uiBlock) % 4 == 0);
-  else
-    return ((uiBlock) % 16 == 0);
-}
-
-/**************************************************************************/
-/*!
-    @brief   Indicates whether the specified block number is the sector
-             trailer.
-    @param   uiBlock  Block number to test.
-    @return  true if sector trailer, false otherwise.
-*/
-/**************************************************************************/
-bool Adafruit_PN532::mifareclassic_IsTrailerBlock(uint32_t uiBlock) {
-  // Test if we are in the small or big sectors
-  if (uiBlock < 128)
-    return ((uiBlock + 1) % 4 == 0);
-  else
-    return ((uiBlock + 1) % 16 == 0);
-}
-
-/**************************************************************************/
-/*!
-    Tries to authenticate a block of memory on a MIFARE card using the
-    INDATAEXCHANGE command.  See section 7.3.8 of the PN532 User Manual
-    for more information on sending MIFARE and other commands.
-
-    @param  uid           Pointer to a byte array containing the card UID
-    @param  uidLen        The length (in bytes) of the card's UID (Should
-                          be 4 for MIFARE Classic)
-    @param  blockNumber   The block number to authenticate.  (0..63 for
-                          1KB cards, and 0..255 for 4KB cards).
-    @param  keyNumber     Which key type to use during authentication
-                          (0 = MIFARE_CMD_AUTH_A, 1 = MIFARE_CMD_AUTH_B)
-    @param  keyData       Pointer to a byte array containing the 6 byte
-                          key value
-
-    @returns 1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::mifareclassic_AuthenticateBlock(uint8_t *uid,
-                                                        uint8_t uidLen,
-                                                        uint32_t blockNumber,
-                                                        uint8_t keyNumber,
-                                                        uint8_t *keyData) {
-  // uint8_t len;
-  uint8_t i;
-
-  // Hang on to the key and uid data
-  memcpy(_key, keyData, 6);
-  memcpy(_uid, uid, uidLen);
-  _uidLen = uidLen;
-
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Trying to authenticate card "));
-  Adafruit_PN532::PrintHex(_uid, _uidLen);
-  PN532DEBUGPRINT.print(F("Using authentication KEY "));
-  PN532DEBUGPRINT.print(keyNumber ? 'B' : 'A');
-  PN532DEBUGPRINT.print(F(": "));
-  Adafruit_PN532::PrintHex(_key, 6);
-#endif
-
-  // Prepare the authentication command //
-  pn532_packetbuffer[0] =
-      PN532_COMMAND_INDATAEXCHANGE; /* Data Exchange Header */
-  pn532_packetbuffer[1] = 1;        /* Max card numbers */
-  pn532_packetbuffer[2] = (keyNumber) ? MIFARE_CMD_AUTH_B : MIFARE_CMD_AUTH_A;
-  pn532_packetbuffer[3] =
-      blockNumber; /* Block Number (1K = 0..63, 4K = 0..255 */
-  memcpy(pn532_packetbuffer + 4, _key, 6);
-  for (i = 0; i < _uidLen; i++) {
-    pn532_packetbuffer[10 + i] = _uid[i]; /* 4 byte card ID */
-  }
-
-  if (!sendCommandCheckAck(pn532_packetbuffer, 10 + _uidLen))
-    return 0;
-
-  // Read the response packet
-  readdata(pn532_packetbuffer, 12);
-
-  // check if the response is valid and we are authenticated???
-  // for an auth success it should be bytes 5-7: 0xD5 0x41 0x00
-  // Mifare auth error is technically byte 7: 0x14 but anything other and 0x00
-  // is not good
-  if (pn532_packetbuffer[7] != 0x00) {
-#ifdef PN532DEBUG
-    PN532DEBUGPRINT.print(F("Authentification failed: "));
-    Adafruit_PN532::PrintHexChar(pn532_packetbuffer, 12);
-#endif
-    return 0;
-  }
-
-  return 1;
-}
-
-/**************************************************************************/
-/*!
-    Tries to read an entire 16-byte data block at the specified block
-    address.
-
-    @param  blockNumber   The block number to authenticate.  (0..63 for
-                          1KB cards, and 0..255 for 4KB cards).
-    @param  data          Pointer to the byte array that will hold the
-                          retrieved data (if any)
-
-    @returns 1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::mifareclassic_ReadDataBlock(uint8_t blockNumber,
-                                                    uint8_t *data) {
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Trying to read 16 bytes from block "));
-  PN532DEBUGPRINT.println(blockNumber);
-#endif
-
-  /* Prepare the command */
-  pn532_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE;
-  pn532_packetbuffer[1] = 1;               /* Card number */
-  pn532_packetbuffer[2] = MIFARE_CMD_READ; /* Mifare Read command = 0x30 */
-  pn532_packetbuffer[3] =
-      blockNumber; /* Block Number (0..63 for 1K, 0..255 for 4K) */
-
-  /* Send the command */
-  if (!sendCommandCheckAck(pn532_packetbuffer, 4)) {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Failed to receive ACK for read command"));
-#endif
-    return 0;
-  }
-
-  /* Read the response packet */
-  readdata(pn532_packetbuffer, 26);
-
-  /* If byte 8 isn't 0x00 we probably have an error */
-  if (pn532_packetbuffer[7] != 0x00) {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Unexpected response"));
-    Adafruit_PN532::PrintHexChar(pn532_packetbuffer, 26);
-#endif
-    return 0;
-  }
-
-  /* Copy the 16 data bytes to the output buffer        */
-  /* Block content starts at byte 9 of a valid response */
-  memcpy(data, pn532_packetbuffer + 8, 16);
-
-/* Display data for debug if requested */
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Block "));
-  PN532DEBUGPRINT.println(blockNumber);
-  Adafruit_PN532::PrintHexChar(data, 16);
-#endif
-
-  return 1;
-}
-
-/**************************************************************************/
-/*!
-    Tries to write an entire 16-byte data block at the specified block
-    address.
-
-    @param  blockNumber   The block number to authenticate.  (0..63 for
-                          1KB cards, and 0..255 for 4KB cards).
-    @param  data          The byte array that contains the data to write.
-
-    @returns 1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::mifareclassic_WriteDataBlock(uint8_t blockNumber,
-                                                     uint8_t *data) {
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Trying to write 16 bytes to block "));
-  PN532DEBUGPRINT.println(blockNumber);
-#endif
-
-  /* Prepare the first command */
-  pn532_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE;
-  pn532_packetbuffer[1] = 1;                /* Card number */
-  pn532_packetbuffer[2] = MIFARE_CMD_WRITE; /* Mifare Write command = 0xA0 */
-  pn532_packetbuffer[3] =
-      blockNumber; /* Block Number (0..63 for 1K, 0..255 for 4K) */
-  memcpy(pn532_packetbuffer + 4, data, 16); /* Data Payload */
-
-  /* Send the command */
-  if (!sendCommandCheckAck(pn532_packetbuffer, 20)) {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Failed to receive ACK for write command"));
-#endif
-    return 0;
-  }
-  delay(10);
-
-  /* Read the response packet */
-  readdata(pn532_packetbuffer, 26);
-
-  return 1;
-}
-
-/**************************************************************************/
-/*!
-    Formats a Mifare Classic card to store NDEF Records
-
-    @returns 1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::mifareclassic_FormatNDEF(void) {
-  uint8_t sectorbuffer1[16] = {0x14, 0x01, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1,
-                               0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1};
-  uint8_t sectorbuffer2[16] = {0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1,
-                               0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1};
-  uint8_t sectorbuffer3[16] = {0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0x78, 0x77,
-                               0x88, 0xC1, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
-
-  // Note 0xA0 0xA1 0xA2 0xA3 0xA4 0xA5 must be used for key A
-  // for the MAD sector in NDEF records (sector 0)
-
-  // Write block 1 and 2 to the card
-  if (!(mifareclassic_WriteDataBlock(1, sectorbuffer1)))
-    return 0;
-  if (!(mifareclassic_WriteDataBlock(2, sectorbuffer2)))
-    return 0;
-  // Write key A and access rights card
-  if (!(mifareclassic_WriteDataBlock(3, sectorbuffer3)))
-    return 0;
-
-  // Seems that everything was OK (?!)
-  return 1;
-}
-
-/**************************************************************************/
-/*!
-    Writes an NDEF URI Record to the specified sector (1..15)
-
-    Note that this function assumes that the Mifare Classic card is
-    already formatted to work as an "NFC Forum Tag" and uses a MAD1
-    file system.  You can use the NXP TagWriter app on Android to
-    properly format cards for this.
-
-    @param  sectorNumber  The sector that the URI record should be written
-                          to (can be 1..15 for a 1K card)
-    @param  uriIdentifier The uri identifier code (0 = none, 0x01 =
-                          "http://www.", etc.)
-    @param  url           The uri text to write (max 38 characters).
-
-    @returns 1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::mifareclassic_WriteNDEFURI(uint8_t sectorNumber,
-                                                   uint8_t uriIdentifier,
-                                                   const char *url) {
-  // Figure out how long the string is
-  uint8_t len = strlen(url);
-
-  // Make sure we're within a 1K limit for the sector number
-  if ((sectorNumber < 1) || (sectorNumber > 15))
-    return 0;
-
-  // Make sure the URI payload is between 1 and 38 chars
-  if ((len < 1) || (len > 38))
-    return 0;
-
-  // Note 0xD3 0xF7 0xD3 0xF7 0xD3 0xF7 must be used for key A
-  // in NDEF records
-
-  // Setup the sector buffer (w/pre-formatted TLV wrapper and NDEF message)
-  uint8_t sectorbuffer1[16] = {0x00,
-                               0x00,
-                               0x03,
-                               (uint8_t)(len + 5),
-                               0xD1,
-                               0x01,
-                               (uint8_t)(len + 1),
-                               0x55,
-                               uriIdentifier,
-                               0x00,
-                               0x00,
-                               0x00,
-                               0x00,
-                               0x00,
-                               0x00,
-                               0x00};
-  uint8_t sectorbuffer2[16] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-                               0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
-  uint8_t sectorbuffer3[16] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-                               0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
-  uint8_t sectorbuffer4[16] = {0xD3, 0xF7, 0xD3, 0xF7, 0xD3, 0xF7, 0x7F, 0x07,
-                               0x88, 0x40, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
-  if (len <= 6) {
-    // Unlikely we'll get a url this short, but why not ...
-    memcpy(sectorbuffer1 + 9, url, len);
-    sectorbuffer1[len + 9] = 0xFE;
-  } else if (len == 7) {
-    // 0xFE needs to be wrapped around to next block
-    memcpy(sectorbuffer1 + 9, url, len);
-    sectorbuffer2[0] = 0xFE;
-  } else if ((len > 7) && (len <= 22)) {
-    // Url fits in two blocks
-    memcpy(sectorbuffer1 + 9, url, 7);
-    memcpy(sectorbuffer2, url + 7, len - 7);
-    sectorbuffer2[len - 7] = 0xFE;
-  } else if (len == 23) {
-    // 0xFE needs to be wrapped around to final block
-    memcpy(sectorbuffer1 + 9, url, 7);
-    memcpy(sectorbuffer2, url + 7, len - 7);
-    sectorbuffer3[0] = 0xFE;
-  } else {
-    // Url fits in three blocks
-    memcpy(sectorbuffer1 + 9, url, 7);
-    memcpy(sectorbuffer2, url + 7, 16);
-    memcpy(sectorbuffer3, url + 23, len - 24);
-    sectorbuffer3[len - 22] = 0xFE;
-  }
-
-  // Now write all three blocks back to the card
-  if (!(mifareclassic_WriteDataBlock(sectorNumber * 4, sectorbuffer1)))
-    return 0;
-  if (!(mifareclassic_WriteDataBlock((sectorNumber * 4) + 1, sectorbuffer2)))
-    return 0;
-  if (!(mifareclassic_WriteDataBlock((sectorNumber * 4) + 2, sectorbuffer3)))
-    return 0;
-  if (!(mifareclassic_WriteDataBlock((sectorNumber * 4) + 3, sectorbuffer4)))
-    return 0;
-
-  // Seems that everything was OK (?!)
-  return 1;
-}
-
-/***** Mifare Ultralight Functions ******/
-
-/**************************************************************************/
-/*!
-    @brief   Tries to read an entire 4-byte page at the specified address.
-
-    @param   page        The page number (0..63 in most cases)
-    @param   buffer      Pointer to the byte array that will hold the
-                         retrieved data (if any)
-    @return  1 on success, 0 on error.
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::mifareultralight_ReadPage(uint8_t page,
-                                                  uint8_t *buffer) {
-  if (page >= 64) {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Page value out of range"));
-#endif
-    return 0;
-  }
-
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Reading page "));
-  PN532DEBUGPRINT.println(page);
-#endif
-
-  /* Prepare the command */
-  pn532_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE;
-  pn532_packetbuffer[1] = 1;               /* Card number */
-  pn532_packetbuffer[2] = MIFARE_CMD_READ; /* Mifare Read command = 0x30 */
-  pn532_packetbuffer[3] = page; /* Page Number (0..63 in most cases) */
-
-  /* Send the command */
-  if (!sendCommandCheckAck(pn532_packetbuffer, 4)) {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Failed to receive ACK for write command"));
-#endif
-    return 0;
-  }
-
-  /* Read the response packet */
-  readdata(pn532_packetbuffer, 26);
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.println(F("Received: "));
-  Adafruit_PN532::PrintHexChar(pn532_packetbuffer, 26);
-#endif
-
-  /* If byte 8 isn't 0x00 we probably have an error */
-  if (pn532_packetbuffer[7] == 0x00) {
-    /* Copy the 4 data bytes to the output buffer         */
-    /* Block content starts at byte 9 of a valid response */
-    /* Note that the command actually reads 16 byte or 4  */
-    /* pages at a time ... we simply discard the last 12  */
-    /* bytes                                              */
-    memcpy(buffer, pn532_packetbuffer + 8, 4);
-  } else {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Unexpected response reading block: "));
-    Adafruit_PN532::PrintHexChar(pn532_packetbuffer, 26);
-#endif
-    return 0;
-  }
-
-/* Display data for debug if requested */
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Page "));
-  PN532DEBUGPRINT.print(page);
-  PN532DEBUGPRINT.println(F(":"));
-  Adafruit_PN532::PrintHexChar(buffer, 4);
-#endif
-
-  // Return OK signal
-  return 1;
-}
-
-/**************************************************************************/
-/*!
-    Tries to write an entire 4-byte page at the specified block
-    address.
-
-    @param  page          The page number to write.  (0..63 for most cases)
-    @param  data          The byte array that contains the data to write.
-                          Should be exactly 4 bytes long.
-
-    @returns 1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::mifareultralight_WritePage(uint8_t page,
-                                                   uint8_t *data) {
-
-  if (page >= 64) {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Page value out of range"));
-#endif
-    // Return Failed Signal
-    return 0;
-  }
-
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Trying to write 4 byte page"));
-  PN532DEBUGPRINT.println(page);
-#endif
-
-  /* Prepare the first command */
-  pn532_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE;
-  pn532_packetbuffer[1] = 1; /* Card number */
-  pn532_packetbuffer[2] =
-      MIFARE_ULTRALIGHT_CMD_WRITE; /* Mifare Ultralight Write command = 0xA2 */
-  pn532_packetbuffer[3] = page;    /* Page Number (0..63 for most cases) */
-  memcpy(pn532_packetbuffer + 4, data, 4); /* Data Payload */
-
-  /* Send the command */
-  if (!sendCommandCheckAck(pn532_packetbuffer, 8)) {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Failed to receive ACK for write command"));
-#endif
-
-    // Return Failed Signal
-    return 0;
-  }
-  delay(10);
-
-  /* Read the response packet */
-  readdata(pn532_packetbuffer, 26);
-
-  // Return OK Signal
-  return 1;
-}
-
-/***** NTAG2xx Functions ******/
-
-/**************************************************************************/
-/*!
-    @brief   Tries to read an entire 4-byte page at the specified address.
-
-    @param   page        The page number (0..63 in most cases)
-    @param   buffer      Pointer to the byte array that will hold the
-                         retrieved data (if any)
-    @return  1 on success, 0 on error.
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::ntag2xx_ReadPage(uint8_t page, uint8_t *buffer) {
-  // TAG Type       PAGES   USER START    USER STOP
-  // --------       -----   ----------    ---------
-  // NTAG 203       42      4             39
-  // NTAG 213       45      4             39
-  // NTAG 215       135     4             129
-  // NTAG 216       231     4             225
-
-  if (page >= 231) {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Page value out of range"));
-#endif
-    return 0;
-  }
-
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Reading page "));
-  PN532DEBUGPRINT.println(page);
-#endif
-
-  /* Prepare the command */
-  pn532_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE;
-  pn532_packetbuffer[1] = 1;               /* Card number */
-  pn532_packetbuffer[2] = MIFARE_CMD_READ; /* Mifare Read command = 0x30 */
-  pn532_packetbuffer[3] = page; /* Page Number (0..63 in most cases) */
-
-  /* Send the command */
-  if (!sendCommandCheckAck(pn532_packetbuffer, 4)) {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Failed to receive ACK for write command"));
-#endif
-    return 0;
-  }
-
-  /* Read the response packet */
-  readdata(pn532_packetbuffer, 26);
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.println(F("Received: "));
-  Adafruit_PN532::PrintHexChar(pn532_packetbuffer, 26);
-#endif
-
-  /* If byte 8 isn't 0x00 we probably have an error */
-  if (pn532_packetbuffer[7] == 0x00) {
-    /* Copy the 4 data bytes to the output buffer         */
-    /* Block content starts at byte 9 of a valid response */
-    /* Note that the command actually reads 16 byte or 4  */
-    /* pages at a time ... we simply discard the last 12  */
-    /* bytes                                              */
-    memcpy(buffer, pn532_packetbuffer + 8, 4);
-  } else {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Unexpected response reading block: "));
-    Adafruit_PN532::PrintHexChar(pn532_packetbuffer, 26);
-#endif
-    return 0;
-  }
-
-/* Display data for debug if requested */
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Page "));
-  PN532DEBUGPRINT.print(page);
-  PN532DEBUGPRINT.println(F(":"));
-  Adafruit_PN532::PrintHexChar(buffer, 4);
-#endif
-
-  // Return OK signal
-  return 1;
-}
-
-/**************************************************************************/
-/*!
-    Tries to write an entire 4-byte page at the specified block
-    address.
-
-    @param  page          The page number to write.  (0..63 for most cases)
-    @param  data          The byte array that contains the data to write.
-                          Should be exactly 4 bytes long.
-
-    @returns 1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::ntag2xx_WritePage(uint8_t page, uint8_t *data) {
-  // TAG Type       PAGES   USER START    USER STOP
-  // --------       -----   ----------    ---------
-  // NTAG 203       42      4             39
-  // NTAG 213       45      4             39
-  // NTAG 215       135     4             129
-  // NTAG 216       231     4             225
-
-  if ((page < 4) || (page > 225)) {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Page value out of range"));
-#endif
-    // Return Failed Signal
-    return 0;
-  }
-
-#ifdef MIFAREDEBUG
-  PN532DEBUGPRINT.print(F("Trying to write 4 byte page"));
-  PN532DEBUGPRINT.println(page);
-#endif
-
-  /* Prepare the first command */
-  pn532_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE;
-  pn532_packetbuffer[1] = 1; /* Card number */
-  pn532_packetbuffer[2] =
-      MIFARE_ULTRALIGHT_CMD_WRITE; /* Mifare Ultralight Write command = 0xA2 */
-  pn532_packetbuffer[3] = page;    /* Page Number (0..63 for most cases) */
-  memcpy(pn532_packetbuffer + 4, data, 4); /* Data Payload */
-
-  /* Send the command */
-  if (!sendCommandCheckAck(pn532_packetbuffer, 8)) {
-#ifdef MIFAREDEBUG
-    PN532DEBUGPRINT.println(F("Failed to receive ACK for write command"));
-#endif
-
-    // Return Failed Signal
-    return 0;
-  }
-  delay(10);
-
-  /* Read the response packet */
-  readdata(pn532_packetbuffer, 26);
-
-  // Return OK Signal
-  return 1;
-}
-
-/**************************************************************************/
-/*!
-    Writes an NDEF URI Record starting at the specified page (4..nn)
-
-    Note that this function assumes that the NTAG2xx card is
-    already formatted to work as an "NFC Forum Tag".
-
-    @param  uriIdentifier The uri identifier code (0 = none, 0x01 =
-                          "http://www.", etc.)
-    @param  url           The uri text to write (null-terminated string).
-    @param  dataLen       The size of the data area for overflow checks.
-
-    @returns 1 if everything executed properly, 0 for an error
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::ntag2xx_WriteNDEFURI(uint8_t uriIdentifier, char *url,
-                                             uint8_t dataLen) {
-  uint8_t pageBuffer[4] = {0, 0, 0, 0};
-
-  // Remove NDEF record overhead from the URI data (pageHeader below)
-  uint8_t wrapperSize = 12;
-
-  // Figure out how long the string is
-  uint8_t len = strlen(url);
-
-  // Make sure the URI payload will fit in dataLen (include 0xFE trailer)
-  if ((len < 1) || (len + 1 > (dataLen - wrapperSize)))
-    return 0;
-
-  // Setup the record header
-  // See NFCForum-TS-Type-2-Tag_1.1.pdf for details
-  uint8_t pageHeader[12] = {
-      /* NDEF Lock Control TLV (must be first and always present) */
-      0x01, /* Tag Field (0x01 = Lock Control TLV) */
-      0x03, /* Payload Length (always 3) */
-      0xA0, /* The position inside the tag of the lock bytes (upper 4 = page
-               address, lower 4 = byte offset) */
-      0x10, /* Size in bits of the lock area */
-      0x44, /* Size in bytes of a page and the number of bytes each lock bit can
-               lock (4 bit + 4 bits) */
-      /* NDEF Message TLV - URI Record */
-      0x03,               /* Tag Field (0x03 = NDEF Message) */
-      (uint8_t)(len + 5), /* Payload Length (not including 0xFE trailer) */
-      0xD1, /* NDEF Record Header (TNF=0x1:Well known record + SR + ME + MB) */
-      0x01, /* Type Length for the record type indicator */
-      (uint8_t)(len + 1), /* Payload len */
-      0x55,               /* Record Type Indicator (0x55 or 'U' = URI Record) */
-      uriIdentifier       /* URI Prefix (ex. 0x01 = "http://www.") */
-  };
-
-  // Write 12 byte header (three pages of data starting at page 4)
-  memcpy(pageBuffer, pageHeader, 4);
-  if (!(ntag2xx_WritePage(4, pageBuffer)))
-    return 0;
-  memcpy(pageBuffer, pageHeader + 4, 4);
-  if (!(ntag2xx_WritePage(5, pageBuffer)))
-    return 0;
-  memcpy(pageBuffer, pageHeader + 8, 4);
-  if (!(ntag2xx_WritePage(6, pageBuffer)))
-    return 0;
-
-  // Write URI (starting at page 7)
-  uint8_t currentPage = 7;
-  char *urlcopy = url;
-  while (len) {
-    if (len < 4) {
-      memset(pageBuffer, 0, 4);
-      memcpy(pageBuffer, urlcopy, len);
-      pageBuffer[len] = 0xFE; // NDEF record footer
-      if (!(ntag2xx_WritePage(currentPage, pageBuffer)))
-        return 0;
-      // DONE!
-      return 1;
-    } else if (len == 4) {
-      memcpy(pageBuffer, urlcopy, len);
-      if (!(ntag2xx_WritePage(currentPage, pageBuffer)))
-        return 0;
-      memset(pageBuffer, 0, 4);
-      pageBuffer[0] = 0xFE; // NDEF record footer
-      currentPage++;
-      if (!(ntag2xx_WritePage(currentPage, pageBuffer)))
-        return 0;
-      // DONE!
-      return 1;
-    } else {
-      // More than one page of data left
-      memcpy(pageBuffer, urlcopy, 4);
-      if (!(ntag2xx_WritePage(currentPage, pageBuffer)))
-        return 0;
-      currentPage++;
-      urlcopy += 4;
-      len -= 4;
-    }
-  }
-
-  // Seems that everything was OK (?!)
-  return 1;
-}
-
-/************** high level communication functions (handles both I2C and SPI) */
-
-/**************************************************************************/
-/*!
-    @brief  Tries to read the SPI or I2C ACK signal
-*/
-/**************************************************************************/
-bool Adafruit_PN532::readack() {
-  uint8_t ackbuff[6];
-
-  if (spi_dev) {
-    uint8_t cmd = PN532_SPI_DATAREAD;
-    spi_dev->write_then_read(&cmd, 1, ackbuff, 6);
-  } else if (i2c_dev || ser_dev) {
-    readdata(ackbuff, 6);
-  }
-
-  return (0 == memcmp((char *)ackbuff, (char *)pn532ack, 6));
-}
-
-/**************************************************************************/
-/*!
-    @brief  Return true if the PN532 is ready with a response.
-*/
-/**************************************************************************/
-bool Adafruit_PN532::isready() {
-  if (spi_dev) {
-    // SPI ready check via Status Request
-    uint8_t cmd = PN532_SPI_STATREAD;
-    uint8_t reply;
-    spi_dev->write_then_read(&cmd, 1, &reply, 1);
-    return reply == PN532_SPI_READY;
-  } else if (i2c_dev) {
-    // I2C ready check via reading RDY byte
-    uint8_t rdy[1];
-    i2c_dev->read(rdy, 1);
-    return rdy[0] == PN532_I2C_READY;
-  } else if (ser_dev) {
-    // Serial ready check based on non-zero read buffer
-    return (ser_dev->available() != 0);
-  } else if (_irq != -1) {
-    uint8_t x = digitalRead(_irq);
-    return x == 0;
-  }
-  return false;
-}
-
-/**************************************************************************/
-/*!
-    @brief  Waits until the PN532 is ready.
-
-    @param  timeout   Timeout before giving up
-*/
-/**************************************************************************/
-bool Adafruit_PN532::waitready(uint16_t timeout) {
-  uint16_t timer = 0;
-  while (!isready()) {
-    if (timeout != 0) {
-      timer += 10;
-      if (timer > timeout) {
-#ifdef PN532DEBUG
-        PN532DEBUGPRINT.println("TIMEOUT!");
-#endif
-        return false;
-      }
-    }
-    delay(10);
-  }
-  return true;
-}
-
-/**************************************************************************/
-/*!
-    @brief  Reads n bytes of data from the PN532 via SPI or I2C.
-
-    @param  buff      Pointer to the buffer where data will be written
-    @param  n         Number of bytes to be read
-*/
-/**************************************************************************/
-void Adafruit_PN532::readdata(uint8_t *buff, uint8_t n) {
-  if (spi_dev) {
-    // SPI read
-    uint8_t cmd = PN532_SPI_DATAREAD;
-    spi_dev->write_then_read(&cmd, 1, buff, n);
-  } else if (i2c_dev) {
-    // I2C read
-    uint8_t rbuff[n + 1]; // +1 for leading RDY byte
-    i2c_dev->read(rbuff, n + 1);
-    for (uint8_t i = 0; i < n; i++) {
-      buff[i] = rbuff[i + 1];
-    }
-  } else if (ser_dev) {
-    // Serial read
-    ser_dev->readBytes(buff, n);
-  }
-#ifdef PN532DEBUG
-  PN532DEBUGPRINT.print(F("Reading: "));
-  for (uint8_t i = 0; i < n; i++) {
-    PN532DEBUGPRINT.print(F(" 0x"));
-    PN532DEBUGPRINT.print(buff[i], HEX);
-  }
-  PN532DEBUGPRINT.println();
-#endif
-}
-
-/**************************************************************************/
-/*!
-    @brief   set the PN532 as iso14443a Target behaving as a SmartCard
-    @return  true on success, false otherwise.
-    @note    Author: Salvador Mendoza (salmg.net) new functions:
-             -AsTarget
-             -getDataTarget
-             -setDataTarget
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::AsTarget() {
-  pn532_packetbuffer[0] = 0x8C;
-  uint8_t target[] = {
-      0x8C,             // INIT AS TARGET
-      0x00,             // MODE -> BITFIELD
-      0x08, 0x00,       // SENS_RES - MIFARE PARAMS
-      0xdc, 0x44, 0x20, // NFCID1T
-      0x60,             // SEL_RES
-      0x01, 0xfe, // NFCID2T MUST START WITH 01fe - FELICA PARAMS - POL_RES
-      0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xc0,
-      0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, // PAD
-      0xff, 0xff,                               // SYSTEM CODE
-      0xaa, 0x99, 0x88, 0x77, 0x66, 0x55, 0x44,
-      0x33, 0x22, 0x11, 0x01, 0x00, // NFCID3t MAX 47 BYTES ATR_RES
-      0x0d, 0x52, 0x46, 0x49, 0x44, 0x49, 0x4f,
-      0x74, 0x20, 0x50, 0x4e, 0x35, 0x33, 0x32 // HISTORICAL BYTES
-  };
-  if (!sendCommandCheckAck(target, sizeof(target)))
-    return false;
-
-  // read data packet
-  readdata(pn532_packetbuffer, 8);
-
-  int offset = 6;
-  return (pn532_packetbuffer[offset] == 0x15);
-}
-/**************************************************************************/
-/*!
-    @brief   Retrieve response from the emulation mode
-
-    @param   cmd    = data
-    @param   cmdlen = data length
-    @return  true on success, false otherwise.
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::getDataTarget(uint8_t *cmd, uint8_t *cmdlen) {
-  uint8_t length;
-  pn532_packetbuffer[0] = 0x86;
-  if (!sendCommandCheckAck(pn532_packetbuffer, 1, 1000)) {
-    PN532DEBUGPRINT.println(F("Error en ack"));
-    return false;
-  }
-
-  // read data packet
-  readdata(pn532_packetbuffer, 64);
-  length = pn532_packetbuffer[3] - 3;
-
-  // if (length > *responseLength) {// Bug, should avoid it in the reading
-  // target data
-  //  length = *responseLength; // silent truncation...
-  //}
-
-  for (int i = 0; i < length; ++i) {
-    cmd[i] = pn532_packetbuffer[8 + i];
-  }
-  *cmdlen = length;
-  return true;
-}
-
-/**************************************************************************/
-/*!
-    @brief   Set data in PN532 in the emulation mode
-
-    @param   cmd    = data
-    @param   cmdlen = data length
-    @return  true on success, false otherwise.
-*/
-/**************************************************************************/
-uint8_t Adafruit_PN532::setDataTarget(uint8_t *cmd, uint8_t cmdlen) {
-  uint8_t length;
-  // cmd1[0] = 0x8E; Must!
-
-  if (!sendCommandCheckAck(cmd, cmdlen))
-    return false;
-
-  // read data packet
-  readdata(pn532_packetbuffer, 8);
-  length = pn532_packetbuffer[3] - 3;
-  for (int i = 0; i < length; ++i) {
-    cmd[i] = pn532_packetbuffer[8 + i];
-  }
-  // cmdl = 0
-  cmdlen = length;
-
-  int offset = 6;
-  return (pn532_packetbuffer[offset] == 0x15);
-}
-
-/**************************************************************************/
-/*!
-    @brief  Writes a command to the PN532, automatically inserting the
-            preamble and required frame details (checksum, len, etc.)
-
-    @param  cmd       Pointer to the command buffer
-    @param  cmdlen    Command length in bytes
-*/
-/**************************************************************************/
-void Adafruit_PN532::writecommand(uint8_t *cmd, uint8_t cmdlen) {
-  if (spi_dev) {
-    // SPI command write.
-    uint8_t checksum;
-    uint8_t packet[9 + cmdlen];
-    uint8_t *p = packet;
-    cmdlen++;
-
-    p[0] = PN532_SPI_DATAWRITE;
-    p++;
-
-    p[0] = PN532_PREAMBLE;
-    p++;
-    p[0] = PN532_STARTCODE1;
-    p++;
-    p[0] = PN532_STARTCODE2;
-    p++;
-    checksum = PN532_PREAMBLE + PN532_STARTCODE1 + PN532_STARTCODE2;
-
-    p[0] = cmdlen;
-    p++;
-    p[0] = ~cmdlen + 1;
-    p++;
-
-    p[0] = PN532_HOSTTOPN532;
-    p++;
-    checksum += PN532_HOSTTOPN532;
-
-    for (uint8_t i = 0; i < cmdlen - 1; i++) {
-      p[0] = cmd[i];
-      p++;
-      checksum += cmd[i];
-    }
-
-    p[0] = ~checksum;
-    p++;
-    p[0] = PN532_POSTAMBLE;
-    p++;
-
-#ifdef PN532DEBUG
-    Serial.print("Sending : ");
-    for (int i = 1; i < 8 + cmdlen; i++) {
-      Serial.print("0x");
-      Serial.print(packet[i], HEX);
-      Serial.print(", ");
-    }
-    Serial.println();
-#endif
-
-    spi_dev->write(packet, 8 + cmdlen);
-  } else if (i2c_dev || ser_dev) {
-    // I2C or Serial command write.
-    uint8_t packet[8 + cmdlen];
-    uint8_t LEN = cmdlen + 1;
-
-    packet[0] = PN532_PREAMBLE;
-    packet[1] = PN532_STARTCODE1;
-    packet[2] = PN532_STARTCODE2;
-    packet[3] = LEN;
-    packet[4] = ~LEN + 1;
-    packet[5] = PN532_HOSTTOPN532;
-    uint8_t sum = 0;
-    for (uint8_t i = 0; i < cmdlen; i++) {
-      packet[6 + i] = cmd[i];
-      sum += cmd[i];
-    }
-    packet[6 + cmdlen] = ~(PN532_HOSTTOPN532 + sum) + 1;
-    packet[7 + cmdlen] = PN532_POSTAMBLE;
-
-#ifdef PN532DEBUG
-    Serial.print("Sending : ");
-    for (int i = 1; i < 8 + cmdlen; i++) {
-      Serial.print("0x");
-      Serial.print(packet[i], HEX);
-      Serial.print(", ");
-    }
-    Serial.println();
-#endif
-
-    if (i2c_dev) {
-      i2c_dev->write(packet, 8 + cmdlen);
-    } else {
-      ser_dev->write(packet, 8 + cmdlen);
-    }
-  }
-}