读取NFC标签不能与Arduino Uno PN532 itead模块一起使用

我正在努力用Arduino Uno和PN532模块读取NFC标签（然后在其上书写） . 我使用我的Arduino的itead PN532 NFC模块（http://wiki.iteadstudio.com/ITEAD_PN532_NFC_MODULE） . 我想使用I2C通信 . 所以我把我的端口链接起来：

• IRQ（NFC模块）到A2（Arduino Uno）

• RST（NFC模块）到A3（Arduino Uno）

• SDA（NFC模块）到A4（Arduino Uno）

• SCL（NFC模块）到A5（Arduino Uno）

• GND（NFC模块）至GND（Arduino Uno）

• 5V（NFC模块）至5V（Arduino Uno）

然后我使用USB将我的Arduino链接到我的笔记本电脑 . 我已经下载了Adafruit_PN532_master库，用于我的盾牌 . 然后我尝试使用此代码读取NFC标签，但它不能正常工作 .

#include <Wire.h>
#include <SPI.h>
#include <Adafruit_PN532.h>


// If using the breakout with SPI, define the pins for SPI communication.
#define PN532_SCK  (13)
#define PN532_MOSI (11)
#define PN532_SS   (10)
#define PN532_MISO (12)


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

Adafruit_PN532 nfc(PN532_IRQ, PN532_RESET);
boolean val(true);

void setup(void) {
  Serial.begin(115200);
  Serial.println("Hello!");

  nfc.begin();

  uint32_t versiondata = nfc.getFirmwareVersion();
  if (! versiondata) {
    Serial.print("Didn't find PN53x board");
    while (1); 
  }
  // 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);

  // configure board to read RFID tags
  nfc.SAMConfig();

  Serial.println("Waiting for an ISO14443A Card ...");
}


void loop(void) {
  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)
  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, &uid[0], (uint8_t*) &uidLength);
  Serial.println(success);

  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);

    if (uidLength == 4)
    {
      // We probably have a Mifare Classic card ... 
      uint32_t cardid = uid[0];
      cardid <<= 8;
      cardid |= uid[1];
      cardid <<= 8;
      cardid |= uid[2];  
      cardid <<= 8;
      cardid |= uid[3]; 
      Serial.print("Seems to be a Mifare Classic card #");
      Serial.println(cardid);
    }
    Serial.println("");
    val = false;
  }
  delay(1000);
}

由于Arduino监视器，我有"Hello! Found chip PN532. Firmware ver. 1.6. Waiting for an ISO14443A Card..."而且没有别的 . 我的NFC标签在盾牌上面，所以我不读它 . 它似乎检测到标签存在 . 但它可以说明原因 .

即使我从Adafruit_PN532库中运行一个示例，它也会向我显示相同的输出，因为它无法读取标记 .

我可能错过了一些东西......如果您有任何想法，请帮助我吗？

非常感谢！！