Révision du dump exemple fourni avec la lib Adafruit pour le pn532

MifareClassicDump.ino

#include <Adafruit_PN532.h>

#define PN532_IRQ   (2)
#define PN532_RESET (3)  // Not connected by default on the NFC Shield

// Shield with an I2C connection:
Adafruit_PN532 nfc(PN532_IRQ, PN532_RESET);

void setup(void) {
  Serial.begin(115200);
  Serial.println("################################");
  Serial.println("## Mifare Classic Memory Dump ##");
  Serial.println("################################");

  nfc.begin();

  uint32_t versiondata;
  
  versiondata = nfc.getFirmwareVersion();
  if (versiondata) {
    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);
  } else {
    Serial.print("Didn't find PN53x board");
    while (1); // halt
  }
  // configure board to read RFID tags
  nfc.SAMConfig();
  
  Serial.println("Waiting for an ISO14443A Card ...");
}

void loop(void) { 
  uint8_t card;
  uint8_t uid[7];
  uint8_t uidLen;
  uint8_t block;
  bool authentication;
  uint8_t data[16];
  uint8_t key[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
   
  card = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLen);
  if (card) {
    Serial.println("ISO14443A found");
    if (uidLen == 4) {
      Serial.print("Mifare classic card - 4 byte UID : "); 
      nfc.PrintHex(uid, uidLen);
      block = -1;
      authentication = false;
      while (++block < 64) {
        if (nfc.mifareclassic_IsFirstBlock(block))
          authentication = false;
        if (!authentication) {
          if (nfc.mifareclassic_AuthenticateBlock(uid, uidLen, block, 1, key)) {
            authentication = true;
          } else {
            Serial.print("[ERROR] Authentication on block ");
            Serial.println(block, DEC);
          }
        } else {
          if (nfc.mifareclassic_ReadDataBlock(block, data)) {
             Serial.print("Block ");
             Serial.print(block, DEC);
             Serial.print("  ");
             nfc.PrintHexChar(data, 16);
          } else {
             Serial.print("Block ");
             Serial.print(block, DEC);
             Serial.println(" unable to read this block");
          }
        }
      }
    }
    else {
      Serial.println("[ERROR] Card isn't a Mifare classic");
    }
  }
  Serial.print("\n\nWait for a sec\n");
  delay(1000);
  Serial.print("Ok\n");
}