Question

一周前我买了NFC读卡器（PN532 I2C）和5个NFC标签（NTAG216），目的是为Java创建一个接口，所以我可以将Java用于我的项目。接口按预期工作，但是当我尝试NTAG216支持的所有命令（NTAG216 data sheet第32页）时，只有READ，WRITE和COMP_WRITE正在工作。这不是由界面引起的，我也在C中尝试过，但结果相同。那么，我的命令中是否有任何错误，或者libNFC是否以任何方式阻止执行这些命令？对于可能不好的英语我很抱歉，我希望我的问题仍然可以理解。

感谢您的回答，
雅各布

守则：

public class Main {

  public static void main(String[] args) {
    System.load(new File("libNFC-JavaInterface.so").getAbsolutePath());
    Context context = new Context();
    Device device = new Device(context);
    Target target = new Target();
    device.selectPassiveTarget(new Modulation(ModulationType.NMT_ISO14443A, BaudRate.NBR_106), null,
        target);
    int[] response;

    System.out.print("UID: ");
    try {
      System.out.printf("%014X", getUID(device));
    } catch (NFCException e) {
      device.selectPassiveTarget(new Modulation(ModulationType.NMT_ISO14443A, BaudRate.NBR_106),
          null, target);
      System.out.print("FAILED");
    }
    System.out.println();

    System.out.print("Version: ");
    try {
      response = getVersion(device);
      for (int i = 0; i < response.length; i++) {
        System.out.printf("%02X", response[i]);
      }
    } catch (NFCException e) {
      device.selectPassiveTarget(new Modulation(ModulationType.NMT_ISO14443A, BaudRate.NBR_106),
          null, target);
      System.out.print("FAILED");
    }
    System.out.println();

    System.out.print("Read: ");
    try {
      response = read(device, 0x08);
      for (int i = 0; i < response.length; i++) {
        System.out.printf("%02X", response[i]);
      }
    } catch (NFCException e) {
      device.selectPassiveTarget(new Modulation(ModulationType.NMT_ISO14443A, BaudRate.NBR_106),
          null, target);
      System.out.print("FAILED");
    }
    System.out.println();

    System.out.print("Fast Read: ");
    try {
      response = fastRead(device, 0x08, 0x11);
      for (int i = 0; i < response.length; i++) {
        System.out.printf("%02X", response[i]);
      }
    } catch (NFCException e) {
      device.selectPassiveTarget(new Modulation(ModulationType.NMT_ISO14443A, BaudRate.NBR_106),
          null, target);
      System.out.print("FAILED");
    }
    System.out.println();

    System.out.print("Write: ");
    try {
      write(device, 0x08, new int[] {0x41, 0x42, 0x43, 0x44});
      System.out.print("SUCCESSFUL");
    } catch (NFCException e) {
      device.selectPassiveTarget(new Modulation(ModulationType.NMT_ISO14443A, BaudRate.NBR_106),
          null, target);
      System.out.print("FAILED");
    }
    System.out.println();

    System.out.print("Compatibility Write: ");
    try {
      compatibilityWrite(device, 0x09, new int[] {0x45, 0x46, 0x47, 0x48});
      System.out.print("SUCCESSFUL");
    } catch (NFCException e) {
      device.selectPassiveTarget(new Modulation(ModulationType.NMT_ISO14443A, BaudRate.NBR_106),
          null, target);
      System.out.print("FAILED");
    }
    System.out.println();

    System.out.print("Read cnt: ");
    try {
      response = readCnt(device);
      for (int i = 0; i < response.length; i++) {
        System.out.printf("%02X", response[i]);
      }
    } catch (NFCException e) {
      device.selectPassiveTarget(new Modulation(ModulationType.NMT_ISO14443A, BaudRate.NBR_106),
          null, target);
      System.out.print("FAILED");
    }
    System.out.println();

    System.out.print("Read sig: ");
    try {
      response = readSig(device);
      for (int i = 0; i < response.length; i++) {
        System.out.printf("%02X", response[i]);
      }
    } catch (NFCException e) {
      device.selectPassiveTarget(new Modulation(ModulationType.NMT_ISO14443A, BaudRate.NBR_106),
          null, target);
      System.out.print("FAILED");
    }
    System.out.println();

    target.free();
    device.close();
    context.exit();
  }

  public static long getUID(Device device) throws NFCException {
    int[] response = read(device, 0x00);
    return (long) response[0] << 48 | (long) response[1] << 40 | (long) response[2] << 32
        | (long) response[4] << 24 | (long) response[5] << 16 | (long) response[6] << 8
        | (long) response[7] << 0;
  }

  public static int[] getVersion(Device device) throws NFCException {
    int[] response = new int[8];
    device.transceiveBytes(new int[] {0x60}, response, -1);
    return response;
  }

  public static int[] read(Device device, int startPage) throws NFCException {
    int[] response = new int[16];
    device.transceiveBytes(new int[] {0x30, startPage & 0xFF}, response, -1);
    return response;
  }

  public static int[] fastRead(Device device, int startPage, int endPage) throws NFCException {
    int[] response = new int[((endPage &= 0xFF) - (startPage &= 0xFF) + 1) * 4];
    device.transceiveBytes(new int[] {0x3A, startPage, endPage}, response, -1);
    return response;
  }

  public static void write(Device device, int startPage, int[] data) throws NFCException {
    int[] command = new int[6];
    command[0] = 0xA2;
    command[1] = startPage & 0xFF;
    for (int i = 0; i < data.length; i++) {
      command[2 + i] = data[i] & 0xFF;
    }
    device.transceiveBytes(command, new int[0], -1);
  }

  public static void compatibilityWrite(Device device, int startPage, int[] data)
      throws NFCException {
    int[] command = new int[18];
    command[0] = 0xA0;
    command[1] = startPage & 0xFF;
    for (int i = 0; i < data.length; i++) {
      command[2 + i] = data[i] & 0xFF;
    }
    device.transceiveBytes(command, new int[0], -1);
  }

  public static int[] readCnt(Device device) throws NFCException {
    int[] response = new int[3];
    device.transceiveBytes(new int[] {0x39, 0x02}, response, -1);
    return response;
  }

  public static int[] readSig(Device device) throws NFCException {
    int[] response = new int[32];
    device.transceiveBytes(new int[] {0x3C, 0x00}, response, -1);
    return response;
  }
}

跟随输出：

UID: 04675362D55681
Version: error  libnfc.driver.pn532_i2c Application level error detected  (127)
FAILED
Read: 41424344454647480000000000000000
Fast Read: error    libnfc.driver.pn532_i2c Application level error detected  (127)
FAILED
Write: SUCCESSFUL
Compatibility Write: SUCCESSFUL
Read cnt: error libnfc.driver.pn532_i2c Application level error detected  (127)
FAILED
Read sig: error libnfc.driver.pn532_i2c Application level error detected  (127)
FAILED

Answer 1

我没有尝试使用libNFC，但我的代码遇到了同样的问题，所以它可能是同样的修复...

对于NTAG2xx特定函数（GET_VERSION，FAST_READ，READ_CNT，READ_SIG），您需要使用PN532函数“InCommunicateThru”（0x42）而不是“InDataExchange”（0x40）。这个仅适用于标准的NFC论坛功能（READ，WRITE）。

libNFC是否仅支持READ，WRITE和COMP_WRITE

1 个答案: