text: /*
   * RFID.cpp - Library to use ARDUINO RFID MODULE KIT 13.56 MHZ WITH TAGS SPI W AND R BY COOQROBOT.
   * Based on code Dr.Leong   ( WWW.B2CQSHOP.COM )
   * Created by Miguel Balboa, Jan, 2012.
   * Released into the public domain.
   * 整理者：极客工坊bg1lsy (lsy@sogou.com)
   * 整理时间：2013.05.25
   * src: https://github.com/soapdx/arduino_rfid
   */
  
  /******************************************************************************
   * 包含文件
   ******************************************************************************/
  #include <Arduino.h>
  #include <RFID.h>
  
  /******************************************************************************
   * 构造 RFID
   * int chipSelectPin RFID /ENABLE pin
   ******************************************************************************/
  RFID::RFID(int chipSelectPin, int NRSTPD)
  {
    _chipSelectPin = chipSelectPin;
    _NRSTPD = NRSTPD;
  
    pinMode(_chipSelectPin,OUTPUT);     // 设置管脚_chipSelectPin为输出并连接到模块使能口
    digitalWrite(_chipSelectPin, LOW);
  
  
    pinMode(_NRSTPD,OUTPUT);            // 设置管脚NRSTPD为输出，非重置或掉电
    digitalWrite(_NRSTPD, HIGH);
  }
  
  /******************************************************************************
   * 用户 API
   ******************************************************************************/
  
  /******************************************************************************
   * 函 数 名：isCard
   * 功能描述：寻卡
   * 输入参数：无
   * 返 回 值：成功返回ture 失败返回false
   ******************************************************************************/
  bool RFID::isCard()
  {
    unsigned char status;
    unsigned char str[MAX_LEN];
  
    status = MFRC522Request(PICC_REQIDL, str);
    if (status == MI_OK)
      return true;
    else
      return false;
  }
  
  /******************************************************************************
   * 函 数 名：readCardSerial
   * 功能描述：返回卡的序列号 4字节
   * 输入参数：无
   * 返 回 值：成功返回ture 失败返回false
   ******************************************************************************/
  bool RFID::readCardSerial(){
  
    unsigned char status;
    unsigned char str[MAX_LEN];
    
    // 防冲撞，返回卡的序列号 4字节，存入serNum中
    status = anticoll(str);
    memcpy(serNum, str, 5);
    
    if (status == MI_OK)
      return true;
    else
      return false;
  }
  
  /******************************************************************************
   * 函 数 名：init
   * 功能描述：初始化RC522
   * 输入参数：无
   * 返 回 值：无
   ******************************************************************************/
  void RFID::init()
  {
    digitalWrite(_NRSTPD,HIGH);
  
    reset();
  
    //Timer: TPrescaler*TreloadVal/6.78MHz = 24ms
    writeMFRC522(TModeReg, 0x8D);   //Tauto=1; f(Timer) = 6.78MHz/TPreScaler
    writeMFRC522(TPrescalerReg, 0x3E);  //TModeReg[3..0] + TPrescalerReg
    writeMFRC522(TReloadRegL, 30);
    writeMFRC522(TReloadRegH, 0);
    writeMFRC522(TxAutoReg, 0x40);    //100%ASK
    writeMFRC522(ModeReg, 0x3D);    // CRC valor inicial de 0x6363
  
    //ClearBitMask(Status2Reg, 0x08); //MFCrypto1On=0
    //writeMFRC522(RxSelReg, 0x86);   //RxWait = RxSelReg[5..0]
    //writeMFRC522(RFCfgReg, 0x7F);     //RxGain = 48dB
  
    antennaOn();    //打开天线
  }
  
  /******************************************************************************
   * 函 数 名：reset
   * 功能描述：复位RC522
   * 输入参数：无
   * 返 回 值：无
   ******************************************************************************/
  void RFID::reset()
  {
    writeMFRC522(CommandReg, PCD_RESETPHASE);
  }
  
  /******************************************************************************
   * 函 数 名：writeMFRC522
   * 功能描述：向MFRC522的某一寄存器写一个字节数据
   * 输入参数：addr--寄存器地址；val--要写入的值
   * 返 回 值：无
   ******************************************************************************/
  void RFID::writeMFRC522(unsigned char addr, unsigned char val)
  {
    digitalWrite(_chipSelectPin, LOW);
  
    //地址格式：0XXXXXX0
    SPI.transfer((addr<<1)&0x7E);
    SPI.transfer(val);
  
    digitalWrite(_chipSelectPin, HIGH);
  }
  
  /******************************************************************************
   * 函 数 名：readMFRC522
   * 功能描述：从MFRC522的某一寄存器读一个字节数据
   * 输入参数：addr--寄存器地址
   * 返 回 值：返回读取到的一个字节数据
   ******************************************************************************/
  unsigned char RFID::readMFRC522(unsigned char addr)
  {
    unsigned char val;
    digitalWrite(_chipSelectPin, LOW);
    SPI.transfer(((addr<<1)&0x7E) | 0x80);
    val =SPI.transfer(0x00);
    digitalWrite(_chipSelectPin, HIGH);
    return val;
  }
  
  /******************************************************************************
   * 函 数 名：setBitMask
   * 功能描述：置RC522寄存器位
   * 输入参数：reg--寄存器地址;mask--置位值
   * 返 回 值：无
   ******************************************************************************/
  void RFID::setBitMask(unsigned char reg, unsigned char mask)
  {
    unsigned char tmp;
    tmp = readMFRC522(reg);
    writeMFRC522(reg, tmp | mask);  // set bit mask
  }
  
  /******************************************************************************
   * 函 数 名：clearBitMask
   * 功能描述：清RC522寄存器位
   * 输入参数：reg--寄存器地址;mask--清位值
   * 返 回 值：无
   ******************************************************************************/
  void RFID::clearBitMask(unsigned char reg, unsigned char mask)
  {
    unsigned char tmp;
    tmp = readMFRC522(reg);
    writeMFRC522(reg, tmp & (~mask));  // clear bit mask
  }
  
  /******************************************************************************
   * 函 数 名：antennaOn
   * 功能描述：开启天线,每次启动或关闭天险发射之间应至少有1ms的间隔
   * 输入参数：无
   * 返 回 值：无
   ******************************************************************************/
  void RFID::antennaOn(void)
  {
    unsigned char temp;
  
    temp = readMFRC522(TxControlReg);
    if (!(temp & 0x03))
    {
      setBitMask(TxControlReg, 0x03);
    }
  }
  
  /******************************************************************************
   * 函 数 名：antennaOff
   * 功能描述：关闭天线,每次启动或关闭天险发射之间应至少有1ms的间隔
   * 输入参数：无
   * 返 回 值：无
   ******************************************************************************/
  void RFID::antennaOff(void)
  {
    unsigned char temp;
  
    temp = readMFRC522(TxControlReg);
    if (!(temp & 0x03))
    {
      clearBitMask(TxControlReg, 0x03);
    }
  }
  
  /******************************************************************************
   * 函 数 名：calculateCRC
   * 功能描述：用MF522计算CRC
   * 输入参数：pIndata--要读数CRC的数据，len--数据长度，pOutData--计算的CRC结果
   * 返 回 值：无
   ******************************************************************************/
  void RFID::calculateCRC(unsigned char *pIndata, unsigned char len, unsigned char *pOutData)
  {
    unsigned char i, n;
  
    clearBitMask(DivIrqReg, 0x04);      //CRCIrq = 0
    setBitMask(FIFOLevelReg, 0x80);     //清FIFO指针
    //Write_MFRC522(CommandReg, PCD_IDLE);
  
    //向FIFO中写入数据
    for (i=0; i<len; i++)
      writeMFRC522(FIFODataReg, *(pIndata+i));
    writeMFRC522(CommandReg, PCD_CALCCRC);
  
    //等待CRC计算完成
    i = 0xFF;
    do
    {
      n = readMFRC522(DivIrqReg);
      i--;
    }
    while ((i!=0) && !(n&0x04));      //CRCIrq = 1
  
    //读取CRC计算结果
    pOutData[0] = readMFRC522(CRCResultRegL);
    pOutData[1] = readMFRC522(CRCResultRegM);
  }
  
  /******************************************************************************
   * 函 数 名：MFRC522ToCard
   * 功能描述：RC522和ISO14443卡通讯
   * 输入参数：command--MF522命令字，
   *           sendData--通过RC522发送到卡片的数据,
   *                     sendLen--发送的数据长度
   *                     backData--接收到的卡片返回数据，
   *                     backLen--返回数据的位长度
   * 返 回 值：成功返回MI_OK
   ******************************************************************************/
  unsigned char RFID::MFRC522ToCard(unsigned char command, unsigned char *sendData, unsigned char sendLen, unsigned char *backData, unsigned int *backLen)
  {
    unsigned char status = MI_ERR;
    unsigned char irqEn = 0x00;
    unsigned char waitIRq = 0x00;
    unsigned char lastBits;
    unsigned char n;
    unsigned int i;
  
    switch (command)
    {
      case PCD_AUTHENT:   //认证卡密
      {
        irqEn = 0x12;
        waitIRq = 0x10;
        break;
      }
      case PCD_TRANSCEIVE:  //发送FIFO中数据
      {
        irqEn = 0x77;
        waitIRq = 0x30;
        break;
      }
      default:
        break;
    }
  
    writeMFRC522(CommIEnReg, irqEn|0x80); //允许中断请求
    clearBitMask(CommIrqReg, 0x80);       //清除所有中断请求位
    setBitMask(FIFOLevelReg, 0x80);       //FlushBuffer=1, FIFO初始化
  
    writeMFRC522(CommandReg, PCD_IDLE);   //无动作，取消当前命令
  
    //向FIFO中写入数据
    for (i=0; i<sendLen; i++)
      writeMFRC522(FIFODataReg, sendData[i]);
  
    //执行命令
    writeMFRC522(CommandReg, command);
    if (command == PCD_TRANSCEIVE)
      setBitMask(BitFramingReg, 0x80);    //StartSend=1,transmission of data starts
  
    //等待接收数据完成
    i = 2000; //i根据时钟频率调整，操作M1卡最大等待时间25ms
    do
    {
      //CommIrqReg[7..0]
      //Set1 TxIRq RxIRq IdleIRq HiAlerIRq LoAlertIRq ErrIRq TimerIRq
      n = readMFRC522(CommIrqReg);
      i--;
    }
    while ((i!=0) && !(n&0x01) && !(n&waitIRq));
  
    clearBitMask(BitFramingReg, 0x80);      //StartSend=0
  
    if (i != 0)
    {
      if(!(readMFRC522(ErrorReg) & 0x1B)) //BufferOvfl Collerr CRCErr ProtecolErr
      {
        status = MI_OK;
        if (n & irqEn & 0x01)
          status = MI_NOTAGERR;     //??
  
        if (command == PCD_TRANSCEIVE)
        {
          n = readMFRC522(FIFOLevelReg);
          lastBits = readMFRC522(ControlReg) & 0x07;
          if (lastBits)
            *backLen = (n-1)*8 + lastBits;
          else
            *backLen = n*8;
  
          if (n == 0)
            n = 1;
          if (n > MAX_LEN)
            n = MAX_LEN;
  
          //读取FIFO中接收到的数据
          for (i=0; i<n; i++)
            backData[i] = readMFRC522(FIFODataReg);
        }
      }
      else
        status = MI_ERR;
    }
  
    //SetBitMask(ControlReg,0x80);           //timer stops
    //Write_MFRC522(CommandReg, PCD_IDLE);
  
    return status;
  }
  
  
  /******************************************************************************
   * 函 数 名：MFRC522Request
   * 功能描述：寻卡，读取卡类型号
   * 输入参数：reqMode--寻卡方式，
   *           TagType--返回卡片类型
   *                    0x4400 = Mifare_UltraLight
   *                    0x0400 = Mifare_One(S50)
   *                    0x0200 = Mifare_One(S70)
   *                    0x0800 = Mifare_Pro(X)
   *                    0x4403 = Mifare_DESFire
   * 返 回 值：成功返回MI_OK
   ******************************************************************************/
  unsigned char RFID::MFRC522Request(unsigned char reqMode, unsigned char *TagType)
  {
    unsigned char status;
    unsigned int backBits;      //接收到的数据位数
  
    writeMFRC522(BitFramingReg, 0x07);    //TxLastBists = BitFramingReg[2..0] ???
  
    TagType[0] = reqMode;
    status = MFRC522ToCard(PCD_TRANSCEIVE, TagType, 1, TagType, &backBits);
  
    if ((status != MI_OK) || (backBits != 0x10))
      status = MI_ERR;
  
    return status;
  }
  
  /******************************************************************************
   * 函 数 名：anticoll
   * 功能描述：防冲突检测，读取选中卡片的卡序列号
   * 输入参数：serNum--返回4字节卡序列号,第5字节为校验字节
   * 返 回 值：成功返回MI_OK
   ******************************************************************************/
  unsigned char RFID::anticoll(unsigned char *serNum)
  {
    unsigned char status;
    unsigned char i;
    unsigned char serNumCheck=0;
    unsigned int unLen;
  
    //ClearBitMask(Status2Reg, 0x08);   //TempSensclear
    //ClearBitMask(CollReg,0x80);     //ValuesAfterColl
    writeMFRC522(BitFramingReg, 0x00);    //TxLastBists = BitFramingReg[2..0]
  
    serNum[0] = PICC_ANTICOLL;
    serNum[1] = 0x20;
    status = MFRC522ToCard(PCD_TRANSCEIVE, serNum, 2, serNum, &unLen);
  
    if (status == MI_OK)
    {
      //校验卡序列号
      for (i=0; i<4; i++)
        serNumCheck ^= serNum[i];
      if (serNumCheck != serNum[i])
        status = MI_ERR;
    }
  
    //SetBitMask(CollReg, 0x80);    //ValuesAfterColl=1
  
    return status;
  }
  
  /******************************************************************************
   * 函 数 名：auth
   * 功能描述：验证卡片密码
   * 输入参数：authMode--密码验证模式
   *                     0x60 = 验证A密钥
   *                     0x61 = 验证B密钥
   *           BlockAddr--块地址
   *           Sectorkey--扇区密码
   *           serNum--卡片序列号，4字节
   * 返 回 值：成功返回MI_OK
   ******************************************************************************/
  unsigned char RFID::auth(unsigned char authMode, unsigned char BlockAddr, unsigned char *Sectorkey, unsigned char *serNum)
  {
    unsigned char status;
    unsigned int recvBits;
    unsigned char i;
    unsigned char buff[12];
  
    //验证指令+块地址＋扇区密码＋卡序列号
    buff[0] = authMode;
    buff[1] = BlockAddr;
    for (i=0; i<6; i++)
      buff[i+2] = *(Sectorkey+i);
    for (i=0; i<4; i++)
      buff[i+8] = *(serNum+i);
      
    status = MFRC522ToCard(PCD_AUTHENT, buff, 12, buff, &recvBits);
    if ((status != MI_OK) || (!(readMFRC522(Status2Reg) & 0x08)))
      status = MI_ERR;
  
    return status;
  }
  
  /******************************************************************************
   * 函 数 名：read
   * 功能描述：读块数据
   * 输入参数：blockAddr--块地址;recvData--读出的块数据
   * 返 回 值：成功返回MI_OK
   ******************************************************************************/
  unsigned char RFID::read(unsigned char blockAddr, unsigned char *recvData)
  {
    unsigned char status;
    unsigned int unLen;
  
    recvData[0] = PICC_READ;
    recvData[1] = blockAddr;
    calculateCRC(recvData,2, &recvData[2]);
    status = MFRC522ToCard(PCD_TRANSCEIVE, recvData, 4, recvData, &unLen);
  
    if ((status != MI_OK) || (unLen != 0x90))
      status = MI_ERR;
  
    return status;
  }
  
  /******************************************************************************
   * 函 数 名：write
   * 功能描述：写块数据
   * 输入参数：blockAddr--块地址;writeData--向块写16字节数据
   * 返 回 值：成功返回MI_OK
   ******************************************************************************/
  unsigned char RFID::write(unsigned char blockAddr, unsigned char *writeData)
  {
    unsigned char status;
    unsigned int recvBits;
    unsigned char i;
    unsigned char buff[18];
  
    buff[0] = PICC_WRITE;
    buff[1] = blockAddr;
    calculateCRC(buff, 2, &buff[2]);
    status = MFRC522ToCard(PCD_TRANSCEIVE, buff, 4, buff, &recvBits);
  
    if ((status != MI_OK) || (recvBits != 4) || ((buff[0] & 0x0F) != 0x0A))
      status = MI_ERR;
  
    if (status == MI_OK)
    {
      for (i=0; i<16; i++)    //?FIFO?16Byte?? Datos a la FIFO 16Byte escribir
        buff[i] = *(writeData+i);
        
      calculateCRC(buff, 16, &buff[16]);
      status = MFRC522ToCard(PCD_TRANSCEIVE, buff, 18, buff, &recvBits);
  
      if ((status != MI_OK) || (recvBits != 4) || ((buff[0] & 0x0F) != 0x0A))
        status = MI_ERR;
    }
  
    return status;
  }
  
  /******************************************************************************
   * 函 数 名：selectTag
   * 功能描述：选卡，读取卡存储器容量
   * 输入参数：serNum--传入卡序列号
   * 返 回 值：成功返回卡容量
   ******************************************************************************/
  unsigned char RFID::selectTag(unsigned char *serNum)
  {
    unsigned char i;
    unsigned char status;
    unsigned char size;
    unsigned int recvBits;
    unsigned char buffer[9];
  
    //ClearBitMask(Status2Reg, 0x08);                        //MFCrypto1On=0
  
    buffer[0] = PICC_SElECTTAG;
    buffer[1] = 0x70;
  
    for (i=0; i<5; i++)
      buffer[i+2] = *(serNum+i);
  
    calculateCRC(buffer, 7, &buffer[7]);
    
    status = MFRC522ToCard(PCD_TRANSCEIVE, buffer, 9, buffer, &recvBits);
    if ((status == MI_OK) && (recvBits == 0x18))
      size = buffer[0];
    else
      size = 0;
    return size;
  }
  
  /******************************************************************************
   * 函 数 名：Halt
   * 功能描述：命令卡片进入休眠状态
   * 输入参数：无
   * 返 回 值：无
   ******************************************************************************/
  void RFID::halt()
  {
    unsigned char status;
    unsigned int unLen;
    unsigned char buff[4];
  
    buff[0] = PICC_HALT;
    buff[1] = 0;
    calculateCRC(buff, 2, &buff[2]);
  
    status = MFRC522ToCard(PCD_TRANSCEIVE, buff, 4, buff,&unLen);
  }
  