nanoFramework.Iot.Device.Pn532 1.2.606

PN532 - RFID 和 NFC 读取器

PN532 是一个 RFID 和 NFC 读取器。它支持各种标准：IsoIec14443TypeA、IsoIec14443TypeB、Iso18092。此实现还应支持 PN533，它是一个完全的 ASB 串行实现，有更多寄存器和功能，但看起来与此实现向后兼容。

文档

• 官方文档可在 此处 找到
• 查看 [示例]'./samples)，其中包含有关如何读取其他类型卡片（如 Ultralight）的更详细信息

用法

您首先需要通过 I2C、SPI 或串行创建该类。

string device = "COM2";
pn532 = new Pn532(device);

要作为卡读取器，PN532 必须处于监听模式。有两种选项，可以通过使用 ListPassiveTarget 或 AutoPoll 函数。

以下示例演示了轮询简单的 14443 类型 A 卡（如 Mifare）

byte[] retData = null;
while (true)
{
    retData = pn532.ListPassiveTarget(MaxTarget.One, TargetBaudRate.B106kbpsTypeA);
    if (retData is object)
        break;
    // Give time to PN532 to process
    Thread.Sleep(200);
}

if (retData is null)
    return;

// You need to remove the first element at it's the number of tags read
// In, this case we will assume we are reading only 1 tag at a time
var tagData = new SpanByte(retData, 1, retData.Length - 1);
var decrypted = pn532.TryDecode106kbpsTypeA(tagData);

以下示例演示了轮询 14443 类型 B 卡（如信用卡）

byte[] retData = null;
while (true)
{
    retData = pn532.AutoPoll(5, 300, new PollingType[] { PollingType.Passive106kbpsISO144443_4B });
    if (retData is object)
    {
        if (retData.Length >= 3)
            break;
    }

    // Give time to PN532 to process
    Thread.Sleep(200);
}

if (retData is null)
    return;

// Check how many tags and the type
Debug.WriteLine($"Num tags: {retData[0]}, Type: {(PollingType)retData[1]}");
// See documentation page 145
// You need to remove the first element at it's the number of tags read
// In, this case we will assume we are reading only 1 tag at a time
// The second element is the type of the card. In our case, because we are using a Credit Card, we already know it's a Type B card
// The thrid element is the size of the data
var tagData = new SpanByte(retData, 3, retData.Length - 3);
var decrypted = pn532.TryDecodeData106kbpsTypeB(tagData);

读取或写入卡片

PN532实现了读写功能，允许使用高级Mifare卡片类。这种实现抽象化了所使用的读卡器。

一旦检测并选择，如前例所示，将完全转储经典Mifare 1K卡的内容

if (decrypted is object)
{
    Debug.WriteLine($"Tg: {decrypted.TargetNumber}, ATQA: {decrypted.Atqa} SAK: {decrypted.Sak}, NFCID: {BitConverter.ToString(decrypted.NfcId)}");
    if (decrypted.Ats is object)
    Debug.WriteLine($", ATS: {BitConverter.ToString(decrypted.Ats)}");
    
    MifareCard mifareCard = new MifareCard(pn532, decrypted.TargetNumber) { BlockNumber = 0, Command = MifareCardCommand.AuthenticationA };
    mifareCard.SetCapacity(decrypted.Atqa, decrypted.Sak);
    mifareCard.SerialNumber = decrypted.NfcId;
    mifareCard.KeyA = new byte[6] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
    mifareCard.KeyB = new byte[6] { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };/
    for (byte block = 0; block < 64; block++)
    {
        mifareCard.BlockNumber = block;
        mifareCard.Command = MifareCardCommand.AuthenticationB;
        var ret = mifareCard.RunMifiCardCommand();
        if (ret < 0)
        {
            // Try another one
            mifareCard.Command = MifareCardCommand.AuthenticationA;
            ret = mifareCard.RunMifiCardCommand();
        }

        if (ret >= 0)
        {
            mifareCard.BlockNumber = block;
            mifareCard.Command = MifareCardCommand.Read16Bytes;
            ret = mifareCard.RunMifiCardCommand();
            if (ret >= 0)
                Debug.WriteLine($"Bloc: {block}, Data: {BitConverter.ToString(mifareCard.Data)}");
            else
            {
                Debug.WriteLine($"Error reading bloc: {block}, Data: {BitConverter.ToString(mifareCard.Data)}");
            }

            if (block % 4 == 3)
            {
                // Check what are the permissions
                for (byte j = 3; j > 0; j--)
                {
                    var access = mifareCard.BlockAccess((byte)(block - j), mifareCard.Data);
                    Debug.WriteLine($"Bloc: {block - j}, Access: {access}");
                }
                var sector = mifareCard.SectorTailerAccess(block, mifareCard.Data);
                Debug.WriteLine($"Bloc: {block}, Access: {sector}");
            }
        }
        else
        {
            Debug.WriteLine($"Authentication error");
        }
    }

PN532作为目标

可以将PN532模式更改为另一台读卡器（例如，带NFC的手机）识别为目标。以下示例显示了如何将PN532转换为信用卡

static void AsTarget(Pn532 pn532)
{
    byte[] retData = null;
    TargetModeInitialized modeInitialized = null;
    while (true)
    {
        (modeInitialized, retData) = pn532.InitAsTarget(
            TargetModeInitialization.PiccOnly, 
            new TargetMifareParameters() { Atqa = new byte[] { 0x08, 0x00 }, Sak = 0x60 },
            new TargetFeliCaParameters() { NfcId2 = new byte[] { 0x01, 0xFE, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7 }, Pad = new byte[] { 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7 } },
            new TargetPiccParameters() { NfcId3 = new byte[] { 0xAA, 0x99, 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 }, GeneralTarget = new byte[0], HistoricalTarget = new byte[0] });
        if (modeInitialized is object)
            break;

        // Give time to PN532 to process
        Thread.Sleep(200);
    }
    
    if (modeInitialized is null)
        return;

    Debug.WriteLine($"PN532 as a target: ISDep: {modeInitialized.IsDep}, IsPicc {modeInitialized.IsISO14443_4Picc}, {modeInitialized.TargetBaudRate}, {modeInitialized.TargetFramingType}");
    Debug.WriteLine($"Initiator: {BitConverter.ToString(retData)}");
    // 25-D4-00-E8-11-6A-0A-69-1C-46-5D-2D-7C-00-00-00-32-46-66-6D-01-01-12-02-02-07-FF-03-02-00-13-04-01-64-07-01-03
    // 11-D4-00-01-FE-A2-A3-A4-A5-A6-A7-00-00-00-00-00-30            
    // E0-80

    Span<byte> read = stackalloc byte[512];
    int ret = -1;
    while (ret<0)
        ret = pn532.ReadDataAsTarget(read);

    // For example: 00-00-A4-04-00-0E-32-50-41-59-2E-53-59-53-2E-44-44-46-30-31-00
    Debug.WriteLine($"Status: {read[0]}, Data: {BitConverter.ToString(read.Slice(1).ToArray())}");            
}

请注意，这只是初始化过程的第一阶段，展示了如何获取第一份数据和读取数据。在特定情况下，仿真必须理解读卡器发送的命令并正确地模拟卡片。

可以模拟任何A类、B类和Felica卡片。

当前实现

通信支持

• HSU串行端口：完全支持
• I2C：支持
• SPI：支持，但使用了特定的片选引脚
  • SPI模式应为模式0和LSB首先
• 硬件复位引脚：用户代码可以执行此操作

其他命令

• 诊断。注意：仅为部分实现，仅实现了基本测试
• 获取固件版本
• 获取通用状态
• 读取寄存器
• 写入寄存器
• 读取GPIO
• 写入GPIO
• 设置串行波特率
• 设置参数
• SAM配置
• 关机

RF通信命令

• RF配置
• RF规整测试

PN532作为发起者（读卡器）命令

• InJumpForDEP
• InJumpForPSL
• InListPassiveTarget
• InATR
• InPSL
• InDataExchange
• InCommunicateThru
• InDeselect
• InRelease
• InSelect
• InAutoPoll

PN532作为目标（模拟卡片）

• TgInitAsTarget
• TgSetGeneralBytes
• TgGetData
• TgSetData
• TgSetMetaData
• TgGetInitiatorCommand
• TgResponseToInitiator
• TgGetTargetStatus