MF-RC522 RFID 在Arduino中的读取

最重要的是通信方式和连接方式。Arduino板子与RC522之间是SPI通信，Arduino工作在主模式下，
RC522工作在从模式下。连接方式如下：

               Arduino                                       RC522 (工作电压3.3V)

• D5                   <------------->             RST    (这个脚不接貌似也可以)
  
• D10                 <------------->             SDA   (在RC522中即为CS)
  
• D11                 <------------->             MOSI
• D12                 <------------->             MISO
• D13                 <------------->             SCK

代码如下：

#include <SPI.h>

#define uchar unsigned char
#define uint unsigned int

//data array maxium length
#define MAX_LEN 16

/////////////////////////////////////////////////////////////////////
//set the pin
/////////////////////////////////////////////////////////////////////
const int chipSelectPin = 10;
const int NRSTPD = 5;



//MF522 command bits
#define PCD_IDLE              0x00               //NO action; cancel current commands
#define PCD_AUTHENT           0x0E               //verify password key
#define PCD_RECEIVE           0x08               //receive data
#define PCD_TRANSMIT          0x04               //send data
#define PCD_TRANSCEIVE        0x0C               //send and receive data
#define PCD_RESETPHASE        0x0F               //reset
#define PCD_CALCCRC           0x03               //CRC check and caculation

//Mifare_One card command bits
#define PICC_REQIDL           0x26               //Search the cards that not into sleep mode in the antenna area
#define PICC_REQALL           0x52               //Search all the cards in the antenna area
#define PICC_ANTICOLL         0x93               //prevent conflict
#define PICC_SElECTTAG        0x93               //select card
#define PICC_AUTHENT1A        0x60               //verify A password key
#define PICC_AUTHENT1B        0x61               //verify B password key
#define PICC_READ             0x30               //read
#define PICC_WRITE            0xA0               //write
#define PICC_DECREMENT        0xC0               //deduct value
#define PICC_INCREMENT        0xC1               //charge up value
#define PICC_RESTORE          0xC2               //Restore data into buffer
#define PICC_TRANSFER         0xB0               //Save data into buffer
#define PICC_HALT             0x50               //sleep mode


//THe mistake code that return when communicate with MF522
#define MI_OK                 0
#define MI_NOTAGERR           1
#define MI_ERR                2


//------------------MFRC522 register ---------------
//Page 0:Command and Status
#define     Reserved00            0x00
#define     CommandReg            0x01
#define     CommIEnReg            0x02
#define     DivlEnReg             0x03
#define     CommIrqReg            0x04
#define     DivIrqReg             0x05
#define     ErrorReg              0x06
#define     Status1Reg            0x07
#define     Status2Reg            0x08
#define     FIFODataReg           0x09
#define     FIFOLevelReg          0x0A
#define     WaterLevelReg         0x0B
#define     ControlReg            0x0C
#define     BitFramingReg         0x0D
#define     CollReg               0x0E
#define     Reserved01            0x0F
//Page 1:Command
#define     Reserved10            0x10
#define     ModeReg               0x11
#define     TxModeReg             0x12
#define     RxModeReg             0x13
#define     TxControlReg          0x14
#define     TxAutoReg             0x15
#define     TxSelReg              0x16
#define     RxSelReg              0x17
#define     RxThresholdReg        0x18
#define     DemodReg              0x19
#define     Reserved11            0x1A
#define     Reserved12            0x1B
#define     MifareReg             0x1C
#define     Reserved13            0x1D
#define     Reserved14            0x1E
#define     SerialSpeedReg        0x1F
//Page 2:CFG
#define     Reserved20            0x20
#define     CRCResultRegM         0x21
#define     CRCResultRegL         0x22
#define     Reserved21            0x23
#define     ModWidthReg           0x24
#define     Reserved22            0x25
#define     RFCfgReg              0x26
#define     GsNReg                0x27
#define     CWGsPReg              0x28
#define     ModGsPReg             0x29
#define     TModeReg              0x2A
#define     TPrescalerReg         0x2B
#define     TReloadRegH           0x2C
#define     TReloadRegL           0x2D
#define     TCounterValueRegH     0x2E
#define     TCounterValueRegL     0x2F
//Page 3:TestRegister
#define     Reserved30            0x30
#define     TestSel1Reg           0x31
#define     TestSel2Reg           0x32
#define     TestPinEnReg          0x33
#define     TestPinValueReg       0x34
#define     TestBusReg            0x35
#define     AutoTestReg           0x36
#define     VersionReg            0x37
#define     AnalogTestReg         0x38
#define     TestDAC1Reg           0x39
#define     TestDAC2Reg           0x3A
#define     TestADCReg            0x3B
#define     Reserved31            0x3C
#define     Reserved32            0x3D
#define     Reserved33            0x3E
#define     Reserved34              0x3F
//-----------------------------------------------

//4 bytes Serial number of card, the 5 bytes is verfiy bytes
uchar serNum[5];


void setup()
{
    Serial.begin(57600);

    SPI.begin();

    pinMode(chipSelectPin,OUTPUT);             // Set digital pin 10 as OUTPUT to connect it to the RFID /ENABLE pin
    digitalWrite(chipSelectPin, LOW);          // Activate the RFID reader
    pinMode(NRSTPD,OUTPUT);                    // Set digital pin 5 , Not Reset and Power-down

    MFRC522_Init();
}


void loop()
{

    uchar status;
    uchar str[MAX_LEN];


    // Search card, return card types
    status = MFRC522_Request(PICC_REQIDL, str);
    if (status != MI_OK)
    {
        return;
    }


    // Show card type
    ShowCardType(str);

    //Prevent conflict, return the 4 bytes Serial number of the card
    status = MFRC522_Anticoll(str);

    // str[0..3]: serial number of the card
    // str[4]: XOR checksum of the SN.
    if (status == MI_OK)
    {
        Serial.print("The card's number is: ");
        memcpy(serNum, str, 5);
        ShowCardID(serNum);

        // Check people associated with card ID
        uchar* id = serNum;
        if( id[0]==0x4B && id[1]==0xE6 && id[2]==0xD1 && id[3]==0x3B ) {
            Serial.println("Hello Mary!");
        } else if(id[0]==0x3B && id[1]==0xE6 && id[2]==0xD1 && id[3]==0x3B) {
            Serial.println("Hello Greg!");
        }else{
            Serial.println("Hello unkown guy!");
        }
    }


    MFRC522_Halt();    //command the card into sleep mode

    delay(200);
}

/*
 * Function：ShowCardID
 * Description：Show Card ID
 * Input parameter：ID string
 * Return：Null
 */
void ShowCardID(uchar *id)
{
    int IDlen=4;
    for(int i=0; i<IDlen; i++){
        Serial.print(0x0F & (id[i]>>4), HEX);
        Serial.print(0x0F & id[i],HEX);
    }
    Serial.println("");
}

/*
 * Function：ShowCardType
 * Description：Show Card type
 * Input parameter：Type string
 * Return：Null
 */
void ShowCardType(uchar* type)
{
    Serial.print("Card type: ");
    if(type[0]==0x04&&type[1]==0x00)
        Serial.println("MFOne-S50");
    else if(type[0]==0x02&&type[1]==0x00)
        Serial.println("MFOne-S70");
    else if(type[0]==0x44&&type[1]==0x00)
        Serial.println("MF-UltraLight");
    else if(type[0]==0x08&&type[1]==0x00)
        Serial.println("MF-Pro");
    else if(type[0]==0x44&&type[1]==0x03)
        Serial.println("MF Desire");
    else
        Serial.println("Unknown");
}

/*
 * Function：Write_MFRC5200
 * Description：write a byte data into one register of MR RC522
 * Input parameter：addr--register address；val--the value that need to write in
 * Return：Null
 */
void Write_MFRC522(uchar addr, uchar val)
{
    digitalWrite(chipSelectPin, LOW);

    //address format：0XXXXXX0
    SPI.transfer((addr<<1)&0x7E);
    SPI.transfer(val);

    digitalWrite(chipSelectPin, HIGH);
}


/*
 * Function：Read_MFRC522
 * Description：read a byte data into one register of MR RC522
 * Input parameter：addr--register address
 * Return：return the read value
 */
uchar Read_MFRC522(uchar addr)
{
    uchar val;

    digitalWrite(chipSelectPin, LOW);

    //address format：1XXXXXX0
    SPI.transfer(((addr<<1)&0x7E) | 0x80);
    val =SPI.transfer(0x00);

    digitalWrite(chipSelectPin, HIGH);

    return val;
}

/*
 * Function：SetBitMask
 * Description：set RC522 register bit
 * Input parameter：reg--register address;mask--value
 * Return：null
 */
void SetBitMask(uchar reg, uchar mask)
{
    uchar tmp;
    tmp = Read_MFRC522(reg);
    Write_MFRC522(reg, tmp | mask);  // set bit mask
}


/*
 * Function：ClearBitMask
 * Description：clear RC522 register bit
 * Input parameter：reg--register address;mask--value
 * Return：null
 */
void ClearBitMask(uchar reg, uchar mask)
{
    uchar tmp;
    tmp = Read_MFRC522(reg);
    Write_MFRC522(reg, tmp & (~mask));  // clear bit mask
}


/*
 * Function：AntennaOn
 * Description：Turn on antenna, every time turn on or shut down antenna need at least 1ms delay
 * Input parameter：null
 * Return：null
 */
void AntennaOn(void)
{
    uchar temp;

    temp = Read_MFRC522(TxControlReg);
    if (!(temp & 0x03))
    {
        SetBitMask(TxControlReg, 0x03);
    }
}


/*
 * Function：AntennaOff
 * Description：Turn off antenna, every time turn on or shut down antenna need at least 1ms delay
 * Input parameter：null
 * Return：null
 */
void AntennaOff(void)
{
    ClearBitMask(TxControlReg, 0x03);
}


/*
 * Function：ResetMFRC522
 * Description： reset RC522
 * Input parameter：null
 * Return：null
 */
void MFRC522_Reset(void)
{
    Write_MFRC522(CommandReg, PCD_RESETPHASE);
}


/*
 * Function：InitMFRC522
 * Description：initilize RC522
 * Input parameter：null
 * Return：null
 */
void MFRC522_Init(void)
{
    digitalWrite(NRSTPD,HIGH);

    MFRC522_Reset();

    //Timer: TPrescaler*TreloadVal/6.78MHz = 24ms
    Write_MFRC522(TModeReg, 0x8D);        //Tauto=1; f(Timer) = 6.78MHz/TPreScaler
    Write_MFRC522(TPrescalerReg, 0x3E);    //TModeReg[3..0] + TPrescalerReg
    Write_MFRC522(TReloadRegL, 30);
    Write_MFRC522(TReloadRegH, 0);

    Write_MFRC522(TxAutoReg, 0x40);        //100%ASK
    Write_MFRC522(ModeReg, 0x3D);        //CRC initilizate value 0x6363    ???

    //ClearBitMask(Status2Reg, 0x08);        //MFCrypto1On=0
    //Write_MFRC522(RxSelReg, 0x86);        //RxWait = RxSelReg[5..0]
    //Write_MFRC522(RFCfgReg, 0x7F);           //RxGain = 48dB

    AntennaOn();        //turn on antenna
}


/*
 * Function：MFRC522_Request
 * Description：Searching card, read card type
 * Input parameter：reqMode--search methods，
 *             TagType--return card types
 *                 0x4400 = Mifare_UltraLight
 *                0x0400 = Mifare_One(S50)
 *                0x0200 = Mifare_One(S70)
 *                0x0800 = Mifare_Pro(X)
 *                0x4403 = Mifare_DESFire
 * return：return MI_OK if successed
 */
uchar MFRC522_Request(uchar reqMode, uchar *TagType)
{
    uchar status;
    uint backBits;            //the data bits that received

    Write_MFRC522(BitFramingReg, 0x07);        //TxLastBists = BitFramingReg[2..0]    ???

    TagType[0] = reqMode;
    status = MFRC522_ToCard(PCD_TRANSCEIVE, TagType, 1, TagType, &backBits);

    if ((status != MI_OK) || (backBits != 0x10))
    {
        status = MI_ERR;
    }

    return status;
}


/*
 * Function：MFRC522_ToCard
 * Description：communicate between RC522 and ISO14443
 * Input parameter：command--MF522 command bits
 *             sendData--send data to card via rc522
 *             sendLen--send data length
 *             backData--the return data from card
 *             backLen--the length of return data
 * return：return MI_OK if successed
 */
uchar MFRC522_ToCard(uchar command, uchar *sendData, uchar sendLen, uchar *backData, uint *backLen)
{
    uchar status = MI_ERR;
    uchar irqEn = 0x00;
    uchar waitIRq = 0x00;
    uchar lastBits;
    uchar n;
    uint i;

    switch (command)
    {
        case PCD_AUTHENT:        //verify card password
        {
            irqEn = 0x12;
            waitIRq = 0x10;
            break;
        }
        case PCD_TRANSCEIVE:    //send data in the FIFO
        {
            irqEn = 0x77;
            waitIRq = 0x30;
            break;
        }
        default:
            break;
    }

    Write_MFRC522(CommIEnReg, irqEn|0x80);    //Allow interruption
    ClearBitMask(CommIrqReg, 0x80);            //Clear all the interrupt bits
    SetBitMask(FIFOLevelReg, 0x80);            //FlushBuffer=1, FIFO initilizate

    Write_MFRC522(CommandReg, PCD_IDLE);    //NO action;cancel current command    ???

    //write data into FIFO
    for (i=0; i<sendLen; i++)
    {
        Write_MFRC522(FIFODataReg, sendData[i]);
    }

    //procceed it
    Write_MFRC522(CommandReg, command);
    if (command == PCD_TRANSCEIVE)
    {
        SetBitMask(BitFramingReg, 0x80);        //StartSend=1,transmission of data starts
    }

    //waite receive data is finished
    i = 2000;    //i should adjust according the clock, the maxium the waiting time should be 25 ms???
    do
    {
        //CommIrqReg[7..0]
        //Set1 TxIRq RxIRq IdleIRq HiAlerIRq LoAlertIRq ErrIRq TimerIRq
        n = Read_MFRC522(CommIrqReg);
        i--;
    }
    while ((i!=0) && !(n&0x01) && !(n&waitIRq));

    ClearBitMask(BitFramingReg, 0x80);            //StartSend=0

    if (i != 0)
    {
        if(!(Read_MFRC522(ErrorReg) & 0x1B))    //BufferOvfl Collerr CRCErr ProtecolErr
        {
            status = MI_OK;
            if (n & irqEn & 0x01)
            {
                status = MI_NOTAGERR;            //??
            }

            if (command == PCD_TRANSCEIVE)
            {
                n = Read_MFRC522(FIFOLevelReg);
                lastBits = Read_MFRC522(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;
                }

                //read the data from FIFO
                for (i=0; i<n; i++)
                {
                    backData[i] = Read_MFRC522(FIFODataReg);
                }
            }
        }
        else
        {
            status = MI_ERR;
        }

    }

    //SetBitMask(ControlReg,0x80);           //timer stops
    //Write_MFRC522(CommandReg, PCD_IDLE);

    return status;
}


/*
 * Function：MFRC522_Anticoll
 * Description：Prevent conflict, read the card serial number
 * Input parameter：serNum--return the 4 bytes card serial number, the 5th byte is recheck byte
 * return：return MI_OK if successed
 */
uchar MFRC522_Anticoll(uchar *serNum)
{
    uchar status;
    uchar i;
    uchar serNumCheck=0;
    uint unLen;

    //ClearBitMask(Status2Reg, 0x08);        //strSensclear
    //ClearBitMask(CollReg,0x80);            //ValuesAfterColl
    Write_MFRC522(BitFramingReg, 0x00);        //TxLastBists = BitFramingReg[2..0]

    serNum[0] = PICC_ANTICOLL;
    serNum[1] = 0x20;
    status = MFRC522_ToCard(PCD_TRANSCEIVE, serNum, 2, serNum, &unLen);

    if (status == MI_OK)
    {
        //Verify card serial number
        for (i=0; i<4; i++)
        {
            serNumCheck ^= serNum[i];
        }
        if (serNumCheck != serNum[i])
        {
            status = MI_ERR;
        }
    }

    //SetBitMask(CollReg, 0x80);        //ValuesAfterColl=1

    return status;
}


/*
 * Function：CalulateCRC
 * Description：Use MF522 to caculate CRC
 * Input parameter：pIndata--the CRC data need to be read，len--data length，pOutData-- the caculated result of CRC
 * return：Null
 */
void CalulateCRC(uchar *pIndata, uchar len, uchar *pOutData)
{
    uchar i, n;

    ClearBitMask(DivIrqReg, 0x04);            //CRCIrq = 0
    SetBitMask(FIFOLevelReg, 0x80);            //Clear FIFO pointer
    //Write_MFRC522(CommandReg, PCD_IDLE);

    //Write data into FIFO
    for (i=0; i<len; i++)
    {
        Write_MFRC522(FIFODataReg, *(pIndata+i));
    }
    Write_MFRC522(CommandReg, PCD_CALCCRC);

    //waite CRC caculation to finish
    i = 0xFF;
    do
    {
        n = Read_MFRC522(DivIrqReg);
        i--;
    }
    while ((i!=0) && !(n&0x04));            //CRCIrq = 1

    //read CRC caculation result
    pOutData[0] = Read_MFRC522(CRCResultRegL);
    pOutData[1] = Read_MFRC522(CRCResultRegM);
}



/*
 * Function：MFRC522_Write
 * Description：write block data
 * Input parameters：blockAddr--block address;writeData--Write 16 bytes data into block
 * return：return MI_OK if successed
 */
uchar MFRC522_Write(uchar blockAddr, uchar *writeData)
{
    uchar status;
    uint recvBits;
    uchar i;
    uchar buff[18];

    buff[0] = PICC_WRITE;
    buff[1] = blockAddr;
    CalulateCRC(buff, 2, &buff[2]);
    status = MFRC522_ToCard(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++)        //Write 16 bytes data into FIFO
        {
            buff[i] = *(writeData+i);
        }
        CalulateCRC(buff, 16, &buff[16]);
        status = MFRC522_ToCard(PCD_TRANSCEIVE, buff, 18, buff, &recvBits);

        if ((status != MI_OK) || (recvBits != 4) || ((buff[0] & 0x0F) != 0x0A))
        {
            status = MI_ERR;
        }
    }

    return status;
}


/*
 * Function：MFRC522_Halt
 * Description：Command the cards into sleep mode
 * Input parameters：null
 * return：null
 */
void MFRC522_Halt(void)
{
    uchar status;
    uint unLen;
    uchar buff[4];

    buff[0] = PICC_HALT;
    buff[1] = 0;
    CalulateCRC(buff, 2, &buff[2]);

    status = MFRC522_ToCard(PCD_TRANSCEIVE, buff, 4, buff,&unLen);
}