How to coding arduino RFID module

RFID can use in many area such as security systems, door key, etc.
Any RFID card have special ID so you must set your Arduino board to identify that ID for work only on your card.
You have to follow this steps:
1-Connect your RFID module to Arduino board as follow

2-upload the programming code to Arduino board.

3-open "serial monitor" then put your card near RFID module.

4-you must add the number(ID) that shown in serial monitor to the code and upload the code again.

5-Now when you put your card near RFID module the output be turn on and after 5 seconds the output turn off automatically.(this time can change by change the number that written after "delay" in programming code).

 // the sensor communicates using SPI, so include the library:

#include <SPI.h>


#define uchar unsigned char

#define uint unsigned int


//??????

#define MAX_LEN 16


/////////////////////////////////////////////////////////////////////

//set the pin

/////////////////////////////////////////////////////////////////////

const int chipSelectPin = 10;

const int NRSTPD = 9;


//MF522???

#define PCD_IDLE              0x00               //NO action;??????

#define PCD_AUTHENT           0x0E               //????

#define PCD_RECEIVE           0x08               //????

#define PCD_TRANSMIT          0x04               //????

#define PCD_TRANSCEIVE        0x0C               //???????

#define PCD_RESETPHASE        0x0F               //??

#define PCD_CALCCRC           0x03               //CRC??


//Mifare_One?????

#define PICC_REQIDL           0x26               //????????????

#define PICC_REQALL           0x52               //????????

#define PICC_ANTICOLL         0x93               //???

#define PICC_SElECTTAG        0x93               //??

#define PICC_AUTHENT1A        0x60               //??A??

#define PICC_AUTHENT1B        0x61               //??B??

#define PICC_READ             0x30               //??

#define PICC_WRITE            0xA0               //??

#define PICC_DECREMENT        0xC0               //??

#define PICC_INCREMENT        0xC1               //??

#define PICC_RESTORE          0xC2               //????????

#define PICC_TRANSFER         0xB0               //????????

#define PICC_HALT             0x50               //??



//?MF522??????????

#define MI_OK                 0

#define MI_NOTAGERR           1

#define MI_ERR                2



//------------------MFRC522???---------------

//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??????,?5???????

uchar serNum[5];


uchar  writeData[16]={0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 100};  //??? 100??

uchar  moneyConsume = 18 ;  //??18?

uchar  moneyAdd = 10 ;  //??10?

//??A??,16???,??????6Byte

 uchar sectorKeyA[16][16] = {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},

                             {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},

                             //{0x19, 0x84, 0x07, 0x15, 0x76, 0x14},

                             {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},

                            };

 uchar sectorNewKeyA[16][16] = {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},

                                {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xff,0x07,0x80,0x69, 0x19,0x84,0x07,0x15,0x76,0x14},

                                 //you can set another ket , such as  " 0x19, 0x84, 0x07, 0x15, 0x76, 0x14 "

                                 //{0x19, 0x84, 0x07, 0x15, 0x76, 0x14, 0xff,0x07,0x80,0x69, 0x19,0x84,0x07,0x15,0x76,0x14},

                                 // but when loop, please set the  sectorKeyA, the same key, so that RFID module can read the card

                                {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xff,0x07,0x80,0x69, 0x19,0x33,0x07,0x15,0x34,0x14},

                               };


void setup() {              

   Serial.begin(9600);                       // RFID reader SOUT pin connected to Serial RX pin at 2400bps

 // start the SPI library:

  SPI.begin();



  pinMode(5,OUTPUT); 
  pinMode(6,OUTPUT);        

    digitalWrite(chipSelectPin, LOW);          // Activate the RFID reader

  pinMode(NRSTPD,OUTPUT);
 
    digitalWrite(NRSTPD, HIGH);


  MFRC522_Init();

}


void loop()

{

   uchar i,tmp;

 uchar status;

        uchar str[MAX_LEN];

        uchar RC_size;

        uchar blockAddr; //????????0~63

        String mynum = "";



  //??,?????

  status = MFRC522_Request(PICC_REQIDL, str);

  if (status == MI_OK)

  {

                        //Serial.println("Card detected");

   //Serial.print(str[0],BIN);

                        //Serial.print(" , ");

   //Serial.print(str[1],BIN);

                        //Serial.println(" ");

  }


  //???,??????? 4??

  status = MFRC522_Anticoll(str);

  memcpy(serNum, str, 5);

  if (status == MI_OK)

  {


                        //Serial.println("The card's number is  : ");

   Serial.print(serNum[0]);

                        //Serial.print(" , ");

   //Serial.print(serNum[1],BIN);

                        //Serial.print(" , ");

   //Serial.print(serNum[2],BIN);

                        //Serial.print(" , ");

   //Serial.print(serNum[3],BIN);

                        //Serial.print(" , ");

   //Serial.print(serNum[4],BIN);

                        Serial.println(" ");

                      

                        // Should really check all pairs, but for now we'll just use the first

                   

                        if(serNum[0] == 148) {

                          Serial.println("Hello Mousa");

                          digitalWrite(5, HIGH);

                          delay(5000);

                          digitalWrite(5, LOW);

                        

                        } else if(serNum[0] == 112) {

                          Serial.println("Hello Mousa");

                          digitalWrite(6, HIGH);

                          delay(5000);

                          digitalWrite(6, LOW);

                        } else      {             

                          Serial.println("Incorrect");

                          digitalWrite(6, HIGH);

                          delay(5000);

                          digitalWrite(6, LOW);

                        }

                        //delay(5000);

  }

                //Serial.println(" ");

  MFRC522_Halt();   //??????????            

        

}


/*

 * ? ? ?:Write_MFRC5200

 * ????:?MFRC522?????????????

 * ????:addr--?????;val--?????

 * ? ? ?:?

 */

void Write_MFRC522(uchar addr, uchar val)

{

 digitalWrite(chipSelectPin, LOW);


 //????:0XXXXXX0

 SPI.transfer((addr<<1)&0x7E);

 SPI.transfer(val);


 digitalWrite(chipSelectPin, HIGH);

}



/*

 * ? ? ?:Read_MFRC522

 * ????:?MFRC522?????????????

 * ????:addr--?????

 * ? ? ?:????????????

 */

uchar Read_MFRC522(uchar addr)

{

 uchar val;


 digitalWrite(chipSelectPin, LOW);


 //????:1XXXXXX0

 SPI.transfer(((addr<<1)&0x7E) | 0x80);

 val =SPI.transfer(0x00);


 digitalWrite(chipSelectPin, HIGH);


 return val;

}


/*

 * ? ? ?:SetBitMask

 * ????:?RC522????

 * ????:reg--?????;mask--???

 * ? ? ?:?

 */

void SetBitMask(uchar reg, uchar mask)

{

    uchar tmp;

    tmp = Read_MFRC522(reg);

    Write_MFRC522(reg, tmp | mask);  // set bit mask

}



/*

 * ? ? ?:ClearBitMask

 * ????:?RC522????

 * ????:reg--?????;mask--???

 * ? ? ?:?

 */

void ClearBitMask(uchar reg, uchar mask)

{

    uchar tmp;

    tmp = Read_MFRC522(reg);

    Write_MFRC522(reg, tmp & (~mask));  // clear bit mask

}



/*

 * ? ? ?:AntennaOn

 * ????:????,?????????????????1ms???

 * ????:?

 * ? ? ?:?

 */

void AntennaOn(void)

{

 uchar temp;


 temp = Read_MFRC522(TxControlReg);

 if (!(temp & 0x03))

 {

  SetBitMask(TxControlReg, 0x03);

 }

}



/*

 * ? ? ?:AntennaOff

 * ????:????,?????????????????1ms???

 * ????:?

 * ? ? ?:?

 */

void AntennaOff(void)

{

 ClearBitMask(TxControlReg, 0x03);

}



/*

 * ? ? ?:ResetMFRC522

 * ????:??RC522

 * ????:?

 * ? ? ?:?

 */

void MFRC522_Reset(void)

{

    Write_MFRC522(CommandReg, PCD_RESETPHASE);

}



/*

 * ? ? ?:InitMFRC522

 * ????:???RC522

 * ????:?

 * ? ? ?:?

 */

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???0x6363 ???


 //ClearBitMask(Status2Reg, 0x08);  //MFCrypto1On=0

 //Write_MFRC522(RxSelReg, 0x86);  //RxWait = RxSelReg[5..0]

 //Write_MFRC522(RFCfgReg, 0x7F);     //RxGain = 48dB


 AntennaOn();  //????

}



/*

 * ? ? ?:MFRC522_Request

 * ????:??,??????

 * ????:reqMode--????,

 *    TagType--??????

 *     0x4400 = Mifare_UltraLight

 *    0x0400 = Mifare_One(S50)

 *    0x0200 = Mifare_One(S70)

 *    0x0800 = Mifare_Pro(X)

 *    0x4403 = Mifare_DESFire

 * ? ? ?:????MI_OK

 */

uchar MFRC522_Request(uchar reqMode, uchar *TagType)

{

 uchar status;

 uint backBits;   //????????


 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;

}



/*

 * ? ? ?:MFRC522_ToCard

 * ????:RC522?ISO14443???

 * ????:command--MF522???,

 *    sendData--??RC522????????,

 *    sendLen--??????? 

 *    backData--??????????,

 *    backLen--????????

 * ? ? ?:????MI_OK

 */

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:  //????

  {

   irqEn = 0x12;

   waitIRq = 0x10;

   break;

  }

  case PCD_TRANSCEIVE: //??FIFO???

  {

   irqEn = 0x77;

   waitIRq = 0x30;

   break;

  }

  default:

   break;

    }

 

    Write_MFRC522(CommIEnReg, irqEn|0x80); //??????

    ClearBitMask(CommIrqReg, 0x80);   //?????????

    SetBitMask(FIFOLevelReg, 0x80);   //FlushBuffer=1, FIFO???

  

 Write_MFRC522(CommandReg, PCD_IDLE); //NO action;?????? ???


 //?FIFO?????

    for (i=0; i<sendLen; i++)

    { 

  Write_MFRC522(FIFODataReg, sendData[i]);  

 }


 //????

 Write_MFRC522(CommandReg, command);

    if (command == PCD_TRANSCEIVE)

    {  

  SetBitMask(BitFramingReg, 0x80);  //StartSend=1,transmission of data starts

 } 

  

 //????????

 i = 2000; //i????????,??M1???????25ms ???

    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; 

    }

  

    //??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;

}



/*

 * ? ? ?:MFRC522_Anticoll

 * ????:?????,???????????

 * ????:serNum--??4??????,?5???????

 * ? ? ?:????MI_OK

 */

uchar MFRC522_Anticoll(uchar *serNum)

{

    uchar status;

    uchar i;

 uchar serNumCheck=0;

    uint unLen;

  


    //ClearBitMask(Status2Reg, 0x08);  //TempSensclear

    //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)

 {

  //??????

  for (i=0; i<4; i++)

  { 

    serNumCheck ^= serNum[i];

  }

  if (serNumCheck != serNum[i])

  { 

   status = MI_ERR;  

  }

    }


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


    return status;

}



/*

 * ? ? ?:CalulateCRC

 * ????:?MF522??CRC

 * ????:pIndata--???CRC???,len--????,pOutData--???CRC??

 * ? ? ?:?

 */

void CalulateCRC(uchar *pIndata, uchar len, uchar *pOutData)

{

    uchar i, n;


    ClearBitMask(DivIrqReg, 0x04);   //CRCIrq = 0

    SetBitMask(FIFOLevelReg, 0x80);   //?FIFO??

    //Write_MFRC522(CommandReg, PCD_IDLE);


 //?FIFO?????

    for (i=0; i<len; i++)

    { 

  Write_MFRC522(FIFODataReg, *(pIndata+i)); 

 }

    Write_MFRC522(CommandReg, PCD_CALCCRC);


 //??CRC????

    i = 0xFF;

    do

    {

        n = Read_MFRC522(DivIrqReg);

        i--;

    }

    while ((i!=0) && !(n&0x04));   //CRCIrq = 1


 //??CRC????

    pOutData[0] = Read_MFRC522(CRCResultRegL);

    pOutData[1] = Read_MFRC522(CRCResultRegM);

}



/*

 * ? ? ?:MFRC522_SelectTag

 * ????:??,????????

 * ????:serNum--??????

 * ? ? ?:???????

 */

uchar MFRC522_SelectTag(uchar *serNum)

{

    uchar i;

 uchar status;

 uchar size;

    uint recvBits;

    uchar 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);

    }

 CalulateCRC(buffer, 7, &buffer[7]);  //??

    status = MFRC522_ToCard(PCD_TRANSCEIVE, buffer, 9, buffer, &recvBits);

  

    if ((status == MI_OK) && (recvBits == 0x18))

    { 

  size = buffer[0];

 }

    else

    { 

  size = 0;  

 }


    return size;

}



/*

 * ? ? ?:MFRC522_Auth

 * ????:??????

 * ????:authMode--??????

                 0x60 = ??A??

                 0x61 = ??B??

             BlockAddr--???

             Sectorkey--????

             serNum--?????,4??

 * ? ? ?:????MI_OK

 */

uchar MFRC522_Auth(uchar authMode, uchar BlockAddr, uchar *Sectorkey, uchar *serNum)

{

    uchar status;

    uint recvBits;

    uchar i;

 uchar buff[12];


 //????+???+????+????

    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 = MFRC522_ToCard(PCD_AUTHENT, buff, 12, buff, &recvBits);


    if ((status != MI_OK) || (!(Read_MFRC522(Status2Reg) & 0x08)))

    { 

  status = MI_ERR; 

 }

  

    return status;

}



/*

 * ? ? ?:MFRC522_Read

 * ????:????

 * ????:blockAddr--???;recvData--??????

 * ? ? ?:????MI_OK

 */

uchar MFRC522_Read(uchar blockAddr, uchar *recvData)

{

    uchar status;

    uint unLen;


    recvData[0] = PICC_READ;

    recvData[1] = blockAddr;

    CalulateCRC(recvData,2, &recvData[2]);

    status = MFRC522_ToCard(PCD_TRANSCEIVE, recvData, 4, recvData, &unLen);


    if ((status != MI_OK) || (unLen != 0x90))

    {

        status = MI_ERR;

    }

  

    return status;

}



/*

 * ? ? ?:MFRC522_Write

 * ????:????

 * ????:blockAddr--???;writeData--???16????

 * ? ? ?:????MI_OK

 */

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++)  //?FIFO?16Byte??

        {  

         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;

}



/*

 * ? ? ?:MFRC522_Halt

 * ????:??????????

 * ????:?

 * ? ? ?:?

 */

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);

}