无法使用 PN532 验证块

Question

我是 Arduino 新手。我正在尝试将 ID 写入我的 NFC 卡。我使用了示例中的 PN532 库和代码。我不能比authenticateBlock() 更进一步。还有哪个块正在尝试进行身份验证？我在输出中看不到它。

输出：

• 找到 1 个标签
• 感应响应：0x44
• 选择响应：0x0
• 0x4 0xB9 0xC9 0xBA 0x20 0x4B 0x80
• 读卡#3122678656

代码是：

// This example writes a MIFARE memory block 0x08. It is tested with a new MIFARE 1K cards. Uses default keys.
// Note: Memory block 0 is readonly and contains manufacturer data. Do not write to Sector Trailer block
// unless you know what you are doing. Otherwise, the MIFARE card may be unusable in the future.

//Contributed by Seeed Technology Inc (www.seeedstudio.com)

#include <PN532.h>
#include <SPI.h>

/*Chip select pin can be connected to D10 or D9 which is hareware optional*/
/*if you the version of NFC Shield from SeeedStudio is v2.0.*/
#define PN532_CS 10
PN532 nfc(PN532_CS);

uint8_t written = 0;
#define  NFC_DEMO_DEBUG 1

void setup(void) {
#ifdef NFC_DEMO_DEBUG
  Serial.begin(9600);
  Serial.println("Hello!");
#endif
  nfc.begin();

  uint32_t versiondata = nfc.getFirmwareVersion();
  if (! versiondata) {
#ifdef NFC_DEMO_DEBUG
    Serial.print("Didn't find PN53x board");
#endif
    while (1); // halt
  }
#ifdef NFC_DEMO_DEBUG
  // 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);
  Serial.print("Supports ");
  Serial.println(versiondata & 0xFF, HEX);
#endif
  // configure board to read RFID tags and cards
  nfc.SAMConfig();
}

void loop(void) {
  uint32_t id;
  // look for MiFare type cards
  id = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A);
  if (id != 0) {
#ifdef NFC_DEMO_DEBUG
    Serial.print("Read card #");
    Serial.println(id);
    Serial.println();
#endif
    uint8_t keys[] = {
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
    };
    uint8_t writeBuffer[16];
    for (uint8_t i = 0; i < 16; i ++) {
      writeBuffer[i] = i; //Fill buffer with 0,1,2....F
    }
    if (nfc.authenticateBlock(1, id , 0x08, KEY_A, keys)) {
      //authenticate block 0x08
      //if authentication successful
      if (written == 0) {
        //Not written
        written = nfc.writeMemoryBlock(1, 0x08, writeBuffer); // Write writeBuffer[] to block 0x08
        if (written)
#ifdef NFC_DEMO_DEBUG
          Serial.println("Write Successful");
#endif
      }
      uint8_t block[16];
      //read memory block 0x08
      if (nfc.readMemoryBlock(1, 0x08, block)) {
#ifdef NFC_DEMO_DEBUG
        Serial.println("Read block 0x08:");
        //if read operation is successful
        for (uint8_t i = 0; i < 16; i++) {
          //print memory block
          Serial.print(block[i], HEX);
          Serial.print(" ");
        }
        Serial.println();
#endif
      }
    }
  }
  delay(500);
}

Answer 1

SENS_RES (ATQA) = 0x0044、SEL_RES (SAK) = 0x00 和 UID = 0x04B9C9BA204B80 的组合表明您的标签是 MIFARE Ultralight 标签或 NTAG em> 标签。但是，您在问题中显示的代码是为访问 MIFARE Classic 标签而设计的。

MIFARE Ultralight/NTAG 标签不支持nfc.authenticateBlock() 执行的身份验证机制（特定于 MIFARE Classic）。因此，代码将在nfc.authenticateBlock() 上失败。由于您的标签不支持该类型的身份验证（尽管它可能支持不同的机制），您可以尝试跳过身份验证步骤并仅使用读/写方法。这些应该适用于您的标签类型（有一些限制，请参阅Byte array gets truncated when writing to memory of RFID tag using Adafruit PN532 library）。