最近更新于 2023-08-23 01:20

前言

file

我买的这个模块,附带了一张标准 S50 空白卡和一个 S50 异形卡(钥匙卡)。

MF RC522 是应用于 13.56MHz 非接触式通信中高集成度的读写卡芯片,是 NXP 公司针对“三表’应用推出的一款低电压、低成本、体积小的非接触式读写卡芯片,是智能仪表和便携式手持设备研发的较好选择。MF RC522利用了先进的调制和解调概念,完全集成了在 13.56MHz 下所有类型的被动非接触式通信方式和协议。支持 14443A 兼容应答器信号。数字部分处理 ISO14443A 帧和错误检测。此外,还支持快速 CRYPTO1 加密算法,用于验证 MIFARE 系列产品。MF RC522 支持 MIFARE 系列更高速的非接触式通信,双向数据传输速率高达 424kbit/s,它与主机间通信采用 SPI 模式。
支持的卡型有:mifare1 S50、 mifare1 S70、 mifare UltraLight、 mifare Pro、mifare Desfire

测试使用

Arduino

Arduino UNO
Arduino IDE 2.1.1

注:如果遇到下载程序超时失败,可以尝试拔掉 MOSI 引脚接线,之后按一下 Arduino UNO 上的重启按钮,再下载,最后再插上 MOSI 接线。

接线

\begin{array}{|c|c|}
\hline
MFRC522 & Arduino \\
\hline
3V3 & 3.3V \\
\hline
RST & 9 \\
\hline
GND & GND \\
\hline
IRQ & \\
\hline
MISO & 12 \\
\hline
MOSI & 11 \\
\hline
SCK & 13 \\
\hline
SDA & 10 \\
\hline
\end{array}

不使用第三方库

读卡号

这段代码是商家提供的资料里的(我改动了一点点)

#include <SPI.h>

#define uchar   unsigned char
#define uint    unsigned int

//数组最大长度
#define MAX_LEN 16

// 可选引脚
const int chipSelectPin = 10;   // SDA
const int NRSTPD = 9;           // RST

//MF522命令字
#define PCD_IDLE              0x00               //NO action;取消当前命令
#define PCD_AUTHENT           0x0E               //验证密钥
#define PCD_RECEIVE           0x08               //接收数据
#define PCD_TRANSMIT          0x04               //发送数据
#define PCD_TRANSCEIVE        0x0C               //发送并接收数据
#define PCD_RESETPHASE        0x0F               //复位
#define PCD_CALCCRC           0x03               //CRC计算

//Mifare_One卡片命令字
#define PICC_REQIDL           0x26               //寻天线区内未进入休眠状态
#define PICC_REQALL           0x52               //寻天线区内全部卡
#define PICC_ANTICOLL         0x93               //防冲撞
#define PICC_SElECTTAG        0x95              //选卡93
#define PICC_AUTHENT1A        0x60               //验证A密钥
#define PICC_AUTHENT1B        0x61               //验证B密钥
#define PICC_READ             0x30               //读块
#define PICC_WRITE            0xA0               //写块
#define PICC_DECREMENT        0xC0               
#define PICC_INCREMENT        0xC1               
#define PICC_RESTORE          0xC2               //调块数据到缓冲区
#define PICC_TRANSFER         0xB0               //保存缓冲区中数据
#define PICC_HALT             0x50               //休眠

//和MF522通讯时返回的错误代码
#define MI_OK                 0
#define MI_NOTAGERR           (-1)  //1
#define MI_ERR                (-2)  //2

//------------------MFRC522寄存器---------------
//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字节卡序列号,第5字节为校验字节
uchar serNum[5];
uchar  writeDate[16] ={'T', 'e', 'n', 'g', ' ', 'B', 'o', 0, 0, 0, 0, 0, 0, 0, 0,0};
//扇区A密码,16个扇区,每个扇区密码6Byte
 uchar sectorKeyA[16][16] = {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
                             {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
                             {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, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
                                {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xff,0x07,0x80,0x69, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
                               };

void setup() {                
    Serial.begin(9600); 
    // 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;    //选择操作的块地址0~63

    //寻卡,返回卡类型  
    status = MFRC522_Request(PICC_REQIDL, str); 
    if (status == MI_OK)
    {

    }

    //防冲撞,返回卡的序列号 4字节
    status = MFRC522_Anticoll(str);
    memcpy(serNum, str, 5);
    if (status == MI_OK)
    {
                    Serial.print("卡号是:");
        Serial.print(serNum[0], HEX);
                    Serial.print(" ");            
        Serial.print(serNum[1], HEX);
                    Serial.print(" ");      
        Serial.print(serNum[2], HEX);
                    Serial.print(" ");      
        Serial.print(serNum[3], HEX);
                    Serial.print(" ");   
        Serial.print(serNum[4], HEX);                       
                    Serial.println(" ");
    }

    //选卡,返回卡容量
    RC_size = MFRC522_SelectTag(serNum);
    if (RC_size != 0)
    {}

    //写数据卡
    blockAddr = 7;      //数据块7      
    status = MFRC522_Auth(PICC_AUTHENT1A, blockAddr, sectorKeyA[blockAddr/4], serNum);  //认证
    if (status == MI_OK)
    {
        //写数据
        status = MFRC522_Write(blockAddr, sectorNewKeyA[blockAddr/4]);
                    Serial.print("set the new card password, and can modify the data of the Sector: ");
                    Serial.print(blockAddr/4,DEC);

                    //写数据
                    blockAddr = blockAddr - 3 ; 
                    status = MFRC522_Write(blockAddr, writeDate);
                    if(status == MI_OK)
                    {
                        Serial.println("OK!");
                    }
    }

    //读卡
    blockAddr = 7;      //数据块7      
    status = MFRC522_Auth(PICC_AUTHENT1A, blockAddr, sectorNewKeyA[blockAddr/4], serNum);   //认证
    if (status == MI_OK)
    {
        //读数据
                    blockAddr = blockAddr - 3 ; 
                    status = MFRC522_Read(blockAddr, str);
        if (status == MI_OK)
        {
                            Serial.println("Read from the card ,the data is : ");
            for (i=0; i<16; i++)
            {
                            Serial.print(str[i]);
            }
                            Serial.println(" \n");
        }
    }
            //Serial.println(" ");
    MFRC522_Halt();         //命令卡片进入休眠状态
}

/*
 * 函 数 名:Write_MFRC5200
 * 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 Write_MFRC522(uchar addr, uchar val)
{
    digitalWrite(chipSelectPin, LOW);

    //地址格式:0XXXXXX0
    SPI.transfer((addr<<1)&0x7E); 
    SPI.transfer(val);

    digitalWrite(chipSelectPin, HIGH);
}

/*
 * 函 数 名:Read_MFRC522
 * 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
 */
uchar Read_MFRC522(uchar addr)
{
    uchar val;

    digitalWrite(chipSelectPin, LOW);

    //地址格式:1XXXXXX0
    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 SetBitMask(uchar reg, uchar mask)  
{
    uchar tmp;
    tmp = Read_MFRC522(reg);
    Write_MFRC522(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 ClearBitMask(uchar reg, uchar mask)  
{
    uchar tmp;
    tmp = Read_MFRC522(reg);
    Write_MFRC522(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 AntennaOn(void)
{
    uchar temp;

    temp = Read_MFRC522(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 AntennaOff(void)
{
    ClearBitMask(TxControlReg, 0x03);
}

/*
 * 函 数 名:ResetMFRC522
 * 功能描述:复位RC522
 * 输入参数:无
 * 返 回 值:无
 */
void MFRC522_Reset(void)
{
    Write_MFRC522(CommandReg, PCD_RESETPHASE);
}

/*
 * 函 数 名:InitMFRC522
 * 功能描述:初始化RC522
 * 输入参数:无
 * 返 回 值:无
 */
void MFRC522_Init(void)
{
    digitalWrite(NRSTPD,HIGH);

    MFRC522_Reset();
  //////////////////////////////////////////////
        delay(500);/////////////////////////////////
 ///////////////////////////////////////////////
    //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初始值0x6363  ???

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

    AntennaOn();        //打开天线
}

/*
 * 函 数 名:MFRC522_Request
 * 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
 */
uchar MFRC522_Request(uchar reqMode, uchar *TagType)
{
    uchar status;  
    uint backBits;          //接收到的数据位数

    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;
}

/*
 * 函 数 名:MFRC522_ToCard
 * 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
 */
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:       //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;
    }

    Write_MFRC522(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

    Write_MFRC522(CommandReg, PCD_IDLE);    //NO action;取消当前命令  ???

    //向FIFO中写入数据
    for (i=0; i<sendLen; i++)
    {   
        Write_MFRC522(FIFODataReg, sendData[i]);    
    }

    //执行命令
    Write_MFRC522(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 = 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;   
                }

                //读取FIFO中接收到的数据
                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;
}

/*
 * 函 数 名:MFRC522_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
 */
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)
    {
        //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:CalulateCRC
 * 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 CalulateCRC(uchar *pIndata, uchar len, uchar *pOutData)
{
    uchar 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++)
    {   
        Write_MFRC522(FIFODataReg, *(pIndata+i));   
    }
    Write_MFRC522(CommandReg, PCD_CALCCRC);

    //等待CRC计算完成
    i = 0xFF;
    do 
    {
        n = Read_MFRC522(DivIrqReg);
        i--;
    }
    while ((i!=0) && !(n&0x04));            //CRCIrq = 1

    //读取CRC计算结果
    pOutData[0] = Read_MFRC522(CRCResultRegL);
    pOutData[1] = Read_MFRC522(CRCResultRegM);
}

/*
 * 函 数 名:MFRC522_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
 */
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;
}

/*
 * 函 数 名:MFRC522_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
 */
uchar MFRC522_Auth(uchar authMode, uchar BlockAddr, uchar *Sectorkey, uchar *serNum)
{
    uchar status;
    uint recvBits;
    uchar i;
    uchar 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 = MFRC522_ToCard(PCD_AUTHENT, buff, 12, buff, &recvBits);

    if ((status != MI_OK) || (!(Read_MFRC522(Status2Reg) & 0x08)))
    {   
        status = MI_ERR;   
    }

    return status;
}

/*
 * 函 数 名:MFRC522_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
 */
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;
}

/*
 * 函 数 名:MFRC522_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
 */
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++)     //向FIFO写16Byte数据
        {    
            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;
}

/*
 * 函 数 名:MFRC522_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 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);
}

file
file

MFRC522(第三方库)

rfid 1.4.10:https://github.com/miguelbalboa/rfid

模块测试

#include <SPI.h>
#include <MFRC522.h>

#define RST_PIN         9 // RST
#define SS_PIN          10 // SDA

MFRC522 mfrc522(SS_PIN, RST_PIN);  // Create MFRC522 instance

void setup()
{
  Serial.begin(9600);

  SPI.begin();
  mfrc522.PCD_Init();

  Serial.println(F("*****************************"));
  Serial.println(F("MFRC522 自检"));
  Serial.println(F("*****************************"));
  mfrc522.PCD_DumpVersionToSerial(); // 显示固件版本
  Serial.println(F("-----------------------------"));
  Serial.println(F("仅支持已知版本"));
  Serial.println(F("-----------------------------"));
  Serial.println(F("执行测试..."));
  bool result = mfrc522.PCD_PerformSelfTest(); // 测试操作
  Serial.println(F("-----------------------------"));
  Serial.print(F("结果:"));
  if (result)
  {
    Serial.println(F("正常"));
  }
  else
  {
    Serial.println(F("异常"));
  }
  Serial.println();
}

void loop()
{

}

file

作者 IYATT-yx