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Arduino Uno with Mifare RFID RC522

This is an home made microcontroller with Arduino Uno bootloader and the Mifare RFID reader/writer RC522

I bought alot of cards and tags for this system and i manage to read from them the information but i dont know how to write on them.

But with the read funktion it is not that hard to get the code from the tag or card and then use that as a identifyer and make code do different things based on what tag it recognize.

Its really hard finding guides and info about this RFID reader/writer on the web. And i could basically just find a couple of codes for the Arduino

That is the site i took the code from, but i will make my own and post it.

I have connected the RC522 to my homemade microcontroller like this:

Pin 5      --> Reset
Pin 10   --> SS
Pin 11    --> MOSI
Pin 12    --> MISO
Pin 13    --> SCK
Ground --> Ground
3.3V       --> 3.3 V

I would recommend this website for anyone who wants some other ideas.







CODE:

/*

Mifare1 
 */
 // 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 = 5;

//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卡片命令字
#define PICC_REQIDL           0x26               
#define PICC_REQALL           0x52               
#define PICC_ANTICOLL         0x93               
#define PICC_SElECTTAG        0x93               
#define PICC_AUTHENT1A        0x60               
#define PICC_AUTHENT1B        0x61               
#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
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 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(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 10 , Not Reset and Power-down
    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] == 88) {
                          Serial.println("Hello Grant");
                        } else if(serNum[0] == 173) {
                          Serial.println("Hello David");
                        }
                        delay(1000);
}
                //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); //CRC0x6363 ???

//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初始化
    
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; //M125ms ???
    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--45
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);
}
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