Add the PN532 library

examples/pn532_emulatetag/pn532_emulatetag.ino

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+/**************************************************************************/
+/*!
+    This example will attempt to connect to an ISO14443A
+    card or tag and retrieve some basic information about it
+    that can be used to determine what type of card it is.
+
+    Note that you need the baud rate to be 115200 because we need to print
+    out the data and read from the card at the same time!
+
+    To enable debug message, define DEBUG in PN532/PN532_debug.h
+
+*/
+/**************************************************************************/
+
+
+#define NFC_INTERFACE_I2C
+#define BOARD_PN532_RF_REST 45
+#define BOARD_PN532_IRQ     17
+#define BOARD_I2C_SDA       8
+#define BOARD_I2C_SCL       18
+
+#include <Wire.h>
+#include <PN532_I2C.h>
+#include <PN532_I2C.cpp>
+#include <PN532.h>
+
+#include "NdefMessage.h"
+#include "emulatetag.h"
+uint8_t ndefBuf[120];
+NdefMessage message;
+int messageSize;
+
+uint8_t uid[3] = {0x12, 0x34, 0x56};
+
+PN532_I2C pn532i2c(Wire);
+EmulateTag nfc(pn532i2c);
+
+
+void setup(void)
+{
+    Serial.begin(115200);
+
+    int start_delay = 3;
+    while (start_delay)
+    {
+        Serial.print(start_delay);
+        delay(1000);
+        start_delay--;
+    }
+    Serial.println("Hello!");
+
+    // pinMode(_irq, INPUT);
+    pinMode(BOARD_PN532_RF_REST, OUTPUT);
+
+    digitalWrite(BOARD_PN532_RF_REST, LOW);
+    delay(1); // min 20ns
+    digitalWrite(BOARD_PN532_RF_REST, HIGH);
+    delay(2); // max 2ms
+
+    // iic scan
+    Wire.setPins(BOARD_I2C_SDA, BOARD_I2C_SCL);
+    Wire.begin();
+
+    message = NdefMessage();
+    message.addUriRecord("http://www.seeedstudio.com");
+    messageSize = message.getEncodedSize();
+    if (messageSize > sizeof(ndefBuf))
+    {
+        Serial.println("ndefBuf is too small");
+        while (1)
+        {
+        }
+    }
+
+    Serial.print("Ndef encoded message size: ");
+    Serial.println(messageSize);
+
+    message.encode(ndefBuf);
+
+    // comment out this command for no ndef message
+    nfc.setNdefFile(ndefBuf, messageSize);
+
+    // uid must be 3 bytes!
+    nfc.setUid(uid);
+
+    nfc.init();
+}
+
+void loop(void)
+{
+    // uncomment for overriding ndef in case a write to this tag occured
+    // nfc.setNdefFile(ndefBuf, messageSize);
+
+    // start emulation (blocks)
+    // nfc.emulate();
+
+    // or start emulation with timeout
+    if(!nfc.emulate(1000)){ // timeout 1 second
+        Serial.println("timed out");
+      }
+
+    // deny writing to the tag
+    // nfc.setTagWriteable(false);
+
+    if (nfc.writeOccured())
+    {
+        Serial.println("\nWrite occured !");
+        uint8_t *tag_buf;
+        uint16_t length;
+
+        nfc.getContent(&tag_buf, &length);
+        NdefMessage msg = NdefMessage(tag_buf, length);
+        // msg.print();
+    }
+
+    delay(20);
+}

lib/NDEF/Due.h

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+// redefine some stuff so code works on Due
+// http://arduino.cc/forum/index.php?&topic=153761.0
+
+#ifndef Due_h
+#define Due_h
+
+#if defined(__SAM3X8E__)
+    #define PROGMEM
+    #define pgm_read_byte(x)        (*((char *)x))
+//  #define pgm_read_word(x)        (*((short *)(x & 0xfffffffe)))
+    #define pgm_read_word(x)        ( ((*((unsigned char *)x + 1)) << 8) + (*((unsigned char *)x)))
+    #define pgm_read_byte_near(x)   (*((char *)x))
+    #define pgm_read_byte_far(x)    (*((char *)x))
+//  #define pgm_read_word_near(x)   (*((short *)(x & 0xfffffffe))
+//  #define pgm_read_word_far(x)    (*((short *)(x & 0xfffffffe)))
+    #define pgm_read_word_near(x)   ( ((*((unsigned char *)x + 1)) << 8) + (*((unsigned char *)x)))
+    #define pgm_read_word_far(x)    ( ((*((unsigned char *)x + 1)) << 8) + (*((unsigned char *)x))))
+    #define PSTR(x)  x
+  #if defined F
+    #undef F
+  #endif
+  #define F(X) (X)
+#endif
+
+#endif

lib/NDEF/LICENSE.txt

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+Software License Agreement (BSD License)
+
+Copyright (c) 2013-2014, Don Coleman
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holders nor the
+names of its contributors may be used to endorse or promote products
+derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS "AS IS" AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.