最近更新于 2024-05-05 12:31
前言
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);
}
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()
{
}
MF RC522 射频模块(未完成)