PN532 IRQ test

#include "emulatetag.h"
#include "NdefMessage.h"
#include <avr/wdt.h>

#include <SPI.h>
#include <PN532_SPI.h>
#include "PN532.h"
//MEGA
#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
PN532_SPI pn532spi(SPI, 53);
//UNO
#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__)
PN532_SPI pn532spi(SPI, 10);
#endif


#define PN532IRQPIN (2)
PN532 nfc(pn532spi);
void cardreading();

void setup() {
  // put your setup code here, to run once:
  //pinMode(PN532IRQPIN, INPUT);
  Serial.begin(115200);
  Serial.println("\nHello!");
  nfc.begin();
  uint32_t versiondata = nfc.getFirmwareVersion();
  if (! versiondata) {
    Serial.print("Didn't find PN53x board");
    while (1); // halt
  }
  // Got ok data, print it out!
  Serial.print("Found chip PN5"); Serial.println((versiondata>>24) & 0xFF, HEX);
  Serial.print("Firmware ver. "); Serial.print((versiondata>>16) & 0xFF, DEC);
  Serial.print('.'); Serial.println((versiondata>>8) & 0xFF, DEC);

  nfc.SAMConfig();
  //pinMode(PN532IRQPIN, INPUT_PULLUP);
  //nfc.setPassiveActivationRetries(0x00);
  attachInterrupt(digitalPinToInterrupt(PN532IRQPIN), cardreading, FALLING);
  //attachInterrupt(0, cardreading, FALLING);
}

void loop() {
  // put your main code here, to run repeatedly:

}
void cardreading()
{
  Serial.println("Interrupted");
  uint8_t success;
  uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };  // Buffer to store the returned UID
  uint8_t uidLength;                        // Length of the UID (4 or 7 bytes depending on ISO14443A card type)
  // Wait for an ISO14443A type cards (Mifare, etc.).  When one is found
  // 'uid' will be populated with the UID, and uidLength will indicate
  // if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)
  //nfc.inListPassiveTarget();
  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);

  if (success)
  {
    // Display some basic information about the card
    Serial.println("Found an ISO14443A card");
    Serial.print("  UID Length: ");Serial.print(uidLength, DEC);Serial.println(" bytes");
    Serial.print("  UID Value: ");
    nfc.PrintHex(uid, uidLength);
    Serial.println("");
  }
}