我正在寻找一种在 Windows IOT 上的 Raspberry Pi 2.0 上使用 RFID“RC522”的方法。
它当然不是官方兼容的......
官方的（OM5577 演示板）在法国非常昂贵（我还没有找到任何经销商在没有大量运费的情况下出售它（总成本约为 80 美元））。
RC522 很便宜（<10 美元）。它在 Arduino 和 Linux 上的 Raspberry Pi 2.0 上运行良好。但不幸的是还没有在 Windows IOT 上。
我实际上正在使用 arduino 作为桥梁......这不是最佳解决方案；但效果很好，价格总是比 OM5577 低一半。
我找到了这个项目并尝试将它们转换为带有 Windows IOT SIP 和 IO 的 VS (Visual C++) 项目......我惨败......
在我的梦想中，我将能够在 C# 中使用标准 Windows IOT“ProximityDevice”类的这个设备。
你对我有什么想法吗？
提前致谢。
我终于找到了解决方案。
我在 arudino 可移植性方面没有成功；所以我用这个项目作为起点。
该项目是用 C# 编写的。我刚刚为 Windows IOT GPIO 和 SPI 调整了代码。它正在工作！
主要的
var mfrc = new Mfrc522();
await mfrc.InitIO();
while (true)
{
if (mfrc.IsTagPresent())
{
var uid = mfrc.ReadUid();
mfrc.HaltTag();
}
}
库 Mfrc522Lib.cs（多合一）
using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Windows.Devices.Enumeration;
using Windows.Devices.Gpio;
using Windows.Devices.Spi;
namespace Mfrc522Lib
{
public static class Registers
{
private const byte bitFraming = 0x0D;
private const byte comIrq = 0x04;
private const byte comIrqEnable = 0x02;
private const byte command = 0x01;
private const byte control = 0x0C;
private const byte error = 0x06;
private const byte fifoData = 0x09;
private const byte fifoLevel = 0x0A;
private const byte mode = 0x11;
private const byte rxMode = 0x13;
private const byte timerMode = 0x2A;
private const byte timerPrescaler = 0x2B;
private const byte timerReloadHigh = 0x2C;
private const byte timerReloadLow = 0x2D;
private const byte txAsk = 0x15;
private const byte txControl = 0x14;
private const byte txMode = 0x12;
private const byte version = 0x37;
public static byte BitFraming
{
get
{
return bitFraming;
}
}
public static byte ComIrq
{
get
{
return comIrq;
}
}
public static byte ComIrqEnable
{
get
{
return comIrqEnable;
}
}
public static byte Command
{
get
{
return command;
}
}
public static byte Control
{
get
{
return control;
}
}
public static byte Error
{
get
{
return error;
}
}
public static byte FifoData
{
get
{
return fifoData;
}
}
public static byte FifoLevel
{
get
{
return fifoLevel;
}
}
public static byte Mode
{
get
{
return mode;
}
}
public static byte RxMode
{
get
{
return rxMode;
}
}
public static byte TimerMode
{
get
{
return timerMode;
}
}
public static byte TimerPrescaler
{
get
{
return timerPrescaler;
}
}
public static byte TimerReloadHigh
{
get
{
return timerReloadHigh;
}
}
public static byte TimerReloadLow
{
get
{
return timerReloadLow;
}
}
public static byte TxAsk
{
get
{
return txAsk;
}
}
public static byte TxControl
{
get
{
return txControl;
}
}
public static byte TxMode
{
get
{
return txMode;
}
}
public static byte Version
{
get
{
return version;
}
}
}
public static class PiccResponses
{
private const ushort answerToRequest = 0x0004;
private const byte selectAcknowledge = 0x08;
private const byte acknowledge = 0x0A;
public static byte Acknowledge
{
get
{
return acknowledge;
}
}
public static byte SelectAcknowledge
{
get
{
return selectAcknowledge;
}
}
public static ushort AnswerToRequest
{
get
{
return answerToRequest;
}
}
}
public static class PiccCommands
{
private const byte anticollision_1 = 0x93;
private const byte anticollision_2 = 0x20;
private const byte authenticateKeyA = 0x60;
private const byte authenticateKeyB = 0x61;
private const byte halt_1 = 0x50;
private const byte halt_2 = 0x00;
private const byte read = 0x30;
private const byte request = 0x26;
private const byte select_1 = 0x93;
private const byte select_2 = 0x70;
private const byte write = 0xA0;
public static byte AuthenticateKeyA
{
get
{
return authenticateKeyA;
}
}
public static byte AuthenticateKeyB
{
get
{
return authenticateKeyB;
}
}
public static byte Halt_1
{
get
{
return halt_1;
}
}
public static byte Halt_2
{
get
{
return halt_2;
}
}
public static byte Read
{
get
{
return read;
}
}
public static byte Request
{
get
{
return request;
}
}
public static byte Select_1
{
get
{
return select_1;
}
}
public static byte Select_2
{
get
{
return select_2;
}
}
public static byte Write
{
get
{
return write;
}
}
public static byte Anticollision_1
{
get
{
return anticollision_1;
}
}
public static byte Anticollision_2
{
get
{
return anticollision_2;
}
}
}
public static class PcdCommands
{
private const byte idle = 0x00;
private const byte mifareAuthenticate = 0x0E;
private const byte transceive = 0x0C;
public static byte Idle
{
get
{
return idle;
}
}
public static byte MifareAuthenticate
{
get
{
return mifareAuthenticate;
}
}
public static byte Transceive
{
get
{
return transceive;
}
}
}
public class Uid
{
public byte Bcc { get; private set; }
public byte[] Bytes { get; private set; }
public byte[] FullUid { get; private set; }
public bool IsValid { get; private set; }
internal Uid(byte[] uid)
{
FullUid = uid;
Bcc = uid[4];
Bytes = new byte[4];
System.Array.Copy(FullUid, 0, Bytes, 0, 4);
foreach (var b in Bytes)
{
if (b != 0x00)
IsValid = true;
}
}
public sealed override bool Equals(object obj)
{
if (!(obj is Uid))
return false;
var uidWrapper = (Uid)obj;
for (int i = 0; i < 5; i++)
{
if (FullUid[i] != uidWrapper.FullUid[i])
return false;
}
return true;
}
public sealed override int GetHashCode()
{
int uid = 0;
for (int i = 0; i < 4; i++)
uid |= Bytes[i] << (i * 8);
return uid;
}
public sealed override string ToString()
{
var formatString = "x" + (Bytes.Length * 2);
return GetHashCode().ToString(formatString);
}
}
public sealed class Mfrc522
{
public SpiDevice _spi { get; private set; }
public GpioController IoController { get; private set; }
public GpioPin _resetPowerDown { get; private set; }
/* Uncomment for Raspberry Pi 2 */
private const string SPI_CONTROLLER_NAME = "SPI0";
private const Int32 SPI_CHIP_SELECT_LINE = 0;
private const Int32 RESET_PIN = 25;
internal async Task InitIO()
{
try
{
IoController = GpioController.GetDefault();
_resetPowerDown = IoController.OpenPin(RESET_PIN);
_resetPowerDown.Write(GpioPinValue.High);
_resetPowerDown.SetDriveMode(GpioPinDriveMode.Output);
}
/* If initialization fails, throw an exception */
catch (Exception ex)
{
throw new Exception("GPIO initialization failed", ex);
}
try
{
var settings = new SpiConnectionSettings(SPI_CHIP_SELECT_LINE);
settings.ClockFrequency = 1000000;
settings.Mode = SpiMode.Mode0;
String spiDeviceSelector = SpiDevice.GetDeviceSelector();
IReadOnlyList<DeviceInformation> devices = await DeviceInformation.FindAllAsync(spiDeviceSelector);
_spi = await SpiDevice.FromIdAsync(devices[0].Id, settings);
}
/* If initialization fails, display the exception and stop running */
catch (Exception ex)
{
throw new Exception("SPI Initialization Failed", ex);
}
Reset();
}
public void Reset()
{
_resetPowerDown.Write(GpioPinValue.Low);
System.Threading.Tasks.Task.Delay(50).Wait();
_resetPowerDown.Write(GpioPinValue.High);
System.Threading.Tasks.Task.Delay(50).Wait();
// Force 100% ASK modulation
WriteRegister(Registers.TxAsk, 0x40);
// Set CRC to 0x6363
WriteRegister(Registers.Mode, 0x3D);
// Enable antenna
SetRegisterBits(Registers.TxControl, 0x03);
}
public bool IsTagPresent()
{
// Enable short frames
WriteRegister(Registers.BitFraming, 0x07);
// Transceive the Request command to the tag
Transceive(false, PiccCommands.Request);
// Disable short frames
WriteRegister(Registers.BitFraming, 0x00);
// Check if we found a card
return GetFifoLevel() == 2 && ReadFromFifoShort() == PiccResponses.AnswerToRequest;
}
public Uid ReadUid()
{
// Run the anti-collision loop on the card
Transceive(false, PiccCommands.Anticollision_1, PiccCommands.Anticollision_2);
// Return tag UID from FIFO
return new Uid(ReadFromFifo(5));
}
public void HaltTag()
{
// Transceive the Halt command to the tag
Transceive(false, PiccCommands.Halt_1, PiccCommands.Halt_2);
}
public bool SelectTag(Uid uid)
{
// Send Select command to tag
var data = new byte[7];
data[0] = PiccCommands.Select_1;
data[1] = PiccCommands.Select_2;
uid.FullUid.CopyTo(data, 2);
Transceive(true, data);
return GetFifoLevel() == 1 && ReadFromFifo() == PiccResponses.SelectAcknowledge;
}
internal byte[] ReadBlock(byte blockNumber, Uid uid, byte[] keyA = null, byte[] keyB = null)
{
if (keyA != null)
MifareAuthenticate(PiccCommands.AuthenticateKeyA, blockNumber, uid, keyA);
else if (keyB != null)
MifareAuthenticate(PiccCommands.AuthenticateKeyB, blockNumber, uid, keyB);
else
return null;
// Read block
Transceive(true, PiccCommands.Read, blockNumber);
return ReadFromFifo(16);
}
internal bool WriteBlock(byte blockNumber, Uid uid, byte[] data, byte[] keyA = null, byte[] keyB = null)
{
if (keyA != null)
MifareAuthenticate(PiccCommands.AuthenticateKeyA, blockNumber, uid, keyA);
else if (keyB != null)
MifareAuthenticate(PiccCommands.AuthenticateKeyB, blockNumber, uid, keyB);
else
return false;
// Write block
Transceive(true, PiccCommands.Write, blockNumber);
if (ReadFromFifo() != PiccResponses.Acknowledge)
return false;
// Make sure we write only 16 bytes
var buffer = new byte[16];
data.CopyTo(buffer, 0);
Transceive(true, buffer);
return ReadFromFifo() == PiccResponses.Acknowledge;
}
protected void MifareAuthenticate(byte command, byte blockNumber, Uid uid, byte[] key)
{
// Put reader in Idle mode
WriteRegister(Registers.Command, PcdCommands.Idle);
// Clear the FIFO
SetRegisterBits(Registers.FifoLevel, 0x80);
// Create Authentication packet
var data = new byte[12];
data[0] = command;
data[1] = (byte)(blockNumber & 0xFF);
key.CopyTo(data, 2);
uid.Bytes.CopyTo(data, 8);
WriteToFifo(data);
// Put reader in MfAuthent mode
WriteRegister(Registers.Command, PcdCommands.MifareAuthenticate);
// Wait for (a generous) 25 ms
System.Threading.Tasks.Task.Delay(25).Wait();
}
protected void Transceive(bool enableCrc, params byte[] data)
{
if (enableCrc)
{
// Enable CRC
SetRegisterBits(Registers.TxMode, 0x80);
SetRegisterBits(Registers.RxMode, 0x80);
}
// Put reader in Idle mode
WriteRegister(Registers.Command, PcdCommands.Idle);
// Clear the FIFO
SetRegisterBits(Registers.FifoLevel, 0x80);
// Write the data to the FIFO
WriteToFifo(data);
// Put reader in Transceive mode and start sending
WriteRegister(Registers.Command, PcdCommands.Transceive);
SetRegisterBits(Registers.BitFraming, 0x80);
// Wait for (a generous) 25 ms
System.Threading.Tasks.Task.Delay(25).Wait();
// Stop sending
ClearRegisterBits(Registers.BitFraming, 0x80);
if (enableCrc)
{
// Disable CRC
ClearRegisterBits(Registers.TxMode, 0x80);
ClearRegisterBits(Registers.RxMode, 0x80);
}
}
protected byte[] ReadFromFifo(int length)
{
var buffer = new byte[length];
for (int i = 0; i < length; i++)
buffer[i] = ReadRegister(Registers.FifoData);
return buffer;
}
protected byte ReadFromFifo()
{
return ReadFromFifo(1)[0];
}
protected void WriteToFifo(params byte[] values)
{
foreach (var b in values)
WriteRegister(Registers.FifoData, b);
}
protected int GetFifoLevel()
{
return ReadRegister(Registers.FifoLevel);
}
protected byte ReadRegister(byte register)
{
register <<= 1;
register |= 0x80;
var writeBuffer = new byte[] { register, 0x00 };
return TransferSpi(writeBuffer)[1];
}
protected ushort ReadFromFifoShort()
{
var low = ReadRegister(Registers.FifoData);
var high = (ushort)(ReadRegister(Registers.FifoData) << 8);
return (ushort)(high | low);
}
protected void WriteRegister(byte register, byte value)
{
register <<= 1;
var writeBuffer = new byte[] { register, value };
TransferSpi(writeBuffer);
}
protected void SetRegisterBits(byte register, byte bits)
{
var currentValue = ReadRegister(register);
WriteRegister(register, (byte)(currentValue | bits));
}
protected void ClearRegisterBits(byte register, byte bits)
{
var currentValue = ReadRegister(register);
WriteRegister(register, (byte)(currentValue & ~bits));
}
private byte[] TransferSpi(byte[] writeBuffer)
{
var readBuffer = new byte[writeBuffer.Length];
_spi.TransferFullDuplex(writeBuffer, readBuffer);
return readBuffer;
}
}
}
架构
由于它使用 SPI，因此不应该存在硬件兼容性问题。如果你不想翻译现有的 Arduino 代码，微软确实有一些技术可以让你使用现有的 Arduino 草图和库。您可以在这里阅读更多信息：http: //ms-iot.github.io/content/en-US/win10/ArduinoWiringProjectGuide.htm
补充：如果您想将 UID 视为表示十六进制字符的字符串，您可以使用以下内部TagIsPresent部分：
var uid = mfrc.ReadUid();
string txt_Result = "";
foreach (byte byt in uid.FullUid)
{
txt_Result = txt_Result + byt.ToString("x2");
}
mfrc.HaltTag();