Arduino Hangs NFC Shield

[paintlax]

I am using the NFC shield found here (https://www.seeedstudio.com/depot/NFC-Shield-V20-p-1370.html?cPath=19_24) and using the example code below. In the serial monitor "NDEF READER" prints but then the arduino hangs and does print anything else...any suggestions?

#if 0
#include <SPI.h>
#include <PN532_SPI.h>
#include <PN532.h>
#include <NfcAdapter.h>

PN532_SPI pn532spi(SPI, 10);
NfcAdapter nfc = NfcAdapter(pn532spi);
#else

#include <Wire.h>
#include <PN532_I2C.h>
#include <PN532.h>
#include <NfcAdapter.h>

PN532_I2C pn532_i2c(Wire);
NfcAdapter nfc = NfcAdapter(pn532_i2c);
#endif

void setup(void)
{
    Serial.begin(9600);
    Serial.println("NDEF Reader");
    nfc.begin();
}

void loop(void)
{
    Serial.println("\nScan a NFC tag\n");
    if (nfc.tagPresent())
    {
        NfcTag tag = nfc.read();
        tag.print();
    }
    delay(1000);
}

 

[ticoalx]

I am using the NFC shield found here (https://www.seeedstudio.com/depot/NFC-Shield-V20-p-1370.html?cPath=19_24) and using the example code below. In the serial monitor "NDEF READER" prints but then the arduino hangs and does print anything else...any suggestions?

#if 0
#include <SPI.h>
#include <PN532_SPI.h>
#include <PN532.h>
#include <NfcAdapter.h>

PN532_SPI pn532spi(SPI, 10);
NfcAdapter nfc = NfcAdapter(pn532spi);
#else

#include <Wire.h>
#include <PN532_I2C.h>
#include <PN532.h>
#include <NfcAdapter.h>

PN532_I2C pn532_i2c(Wire);
NfcAdapter nfc = NfcAdapter(pn532_i2c);
#endif

void setup(void)
{
    Serial.begin(9600);
    Serial.println("NDEF Reader");
    nfc.begin();
}

void loop(void)
{
    Serial.println("\nScan a NFC tag\n");
    if (nfc.tagPresent())
    {
        NfcTag tag = nfc.read();
        tag.print();
    }
    delay(1000);
}

If the Arduino NFC Shield red light is not on, the board is "hung" and you need to clear the arduino sketch and reboot to bring it back