RC522模块

古城微笑少年丶 2022-08-17 15:29 189阅读 0赞

最近参加了一个比赛，用到树莓派+RC522模块，下面演示由读卡器向屏幕显示数据。

程序中用到了bcm2835的库，所以需要安装这个库：

\[root@alarmpi ~\]\# pcaman -Q libbcm2835

【该库的介绍可以见：[http://www.airspayce.com/mikem/bcm2835/][http_www.airspayce.com_mikem_bcm2835]】

\#include

\#include "RFID.h"

\#include

void writeMFRC522(unsigned char Address, unsigned char value);

void antennaOn(void);

void RFID\_init()

//SPI

bcm2835\_spi\_begin();

bcm2835\_spi\_setBitOrder(BCM2835\_SPI\_BIT\_ORDER\_MSBFIRST);

bcm2835\_spi\_setDataMode(BCM2835\_SPI\_MODE0);

bcm2835\_spi\_setClockDivider(BCM2835\_SPI\_CLOCK\_DIVIDER\_65536);

bcm2835\_spi\_chipSelect(BCM2835\_SPI\_CS0);

bcm2835\_spi\_setChipSelectPolarity(BCM2835\_SPI\_CS0, LOW);

writeMFRC522(CommandReg, PCD\_RESETPHASE);

writeMFRC522(TModeReg, 0x8D);   //Tauto=1; f(Timer) = 6.78MHz/TPreScaler

writeMFRC522(TPrescalerReg, 0x3E);  //TModeReg\[3..0\] + TPrescalerReg

writeMFRC522(TReloadRegL, 30);

writeMFRC522(TReloadRegH, 0);

writeMFRC522(TxAutoReg, 0x40);    //100%ASK

writeMFRC522(ModeReg, 0x3D);    // CRC valor inicial de 0x6363

antennaOn();    //打开天线

void writeMFRC522(unsigned char Address, unsigned char value)

char buff\[2\];

buff\[0\] = (char)((Address<<1)&0x7E);

buff\[1\] = (char)value;

bcm2835\_spi\_transfern(buff,2);

unsigned char readMFRC522(unsigned char Address)

char buff\[2\];

buff\[0\] = ((Address<<1)&0x7E)|0x80;

bcm2835\_spi\_transfern(buff,2);

return (uint8\_t)buff\[1\];

void setBitMask(unsigned char reg, unsigned char mask)

unsigned char tmp;

tmp = readMFRC522(reg);

writeMFRC522(reg, tmp | mask);  // set bit mask

void clearBitMask(unsigned char reg, unsigned char mask)

unsigned char tmp;

tmp = readMFRC522(reg);

writeMFRC522(reg, tmp & (~mask));  // clear bit mask

void antennaOn(void)

unsigned char temp;

temp = readMFRC522(TxControlReg);

if (!(temp & 0x03))

setBitMask(TxControlReg, 0x03);

void antennaOff(void)

unsigned char temp;

temp = readMFRC522(TxControlReg);

if (!(temp & 0x03))

clearBitMask(TxControlReg, 0x03);

void calculateCRC(unsigned char \*pIndata, unsigned char len, unsigned char \*pOutData)

unsigned char 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

writeMFRC522(FIFODataReg, \*(pIndata+i));

writeMFRC522(CommandReg, PCD\_CALCCRC);

//等待CRC计算完成

i = 0xFF;

n = readMFRC522(DivIrqReg);

i--;

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

//读取CRC计算结果

pOutData\[0\] = readMFRC522(CRCResultRegL);

pOutData\[1\] = readMFRC522(CRCResultRegM);

unsigned char MFRC522ToCard(unsigned char command, unsigned char \*sendData, unsigned char sendLen, unsigned char \*backData, unsigned int \*backLen)

unsigned char status = MI\_ERR;

unsigned char irqEn = 0x00;

unsigned char waitIRq = 0x00;

unsigned char lastBits;

unsigned char n;

unsigned int 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;

writeMFRC522(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

writeMFRC522(CommandReg, PCD\_IDLE);   //无动作，取消当前命令

//向FIFO中写入数据

for (i=0; i

writeMFRC522(FIFODataReg, sendData\[i\]);

//执行命令

writeMFRC522(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

//CommIrqReg\[7..0\]

//Set1 TxIRq RxIRq IdleIRq HiAlerIRq LoAlertIRq ErrIRq TimerIRq

n = readMFRC522(CommIrqReg);

i--;

while ((i!=0) && !(n&0x01) && !(n&waitIRq));

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

if (i != 0)

if(!(readMFRC522(ErrorReg) & 0x1B)) //BufferOvfl Collerr CRCErr ProtecolErr

status = MI\_OK;

if (n & irqEn & 0x01)

status = MI\_NOTAGERR;     //??

if (command == PCD\_TRANSCEIVE)

n = readMFRC522(FIFOLevelReg);

lastBits = readMFRC522(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

backData\[i\] = readMFRC522(FIFODataReg);

else

status = MI\_ERR;

//SetBitMask(ControlReg,0x80);           //timer stops

//Write\_MFRC522(CommandReg, PCD\_IDLE);

return status;

unsigned char findCard(unsigned char reqMode, unsigned char \*TagType)

unsigned char status;

unsigned int backBits;      //接收到的数据位数

writeMFRC522(BitFramingReg, 0x07);    //TxLastBists = BitFramingReg\[2..0\] ???

TagType\[0\] = reqMode;

status = MFRC522ToCard(PCD\_TRANSCEIVE, TagType, 1, TagType, &backBits);

if ((status != MI\_OK) || (backBits != 0x10))

status = MI\_ERR;

return status;

unsigned char anticoll(unsigned char \*serNum)

unsigned char status;

unsigned char i;

unsigned char serNumCheck=0;

unsigned int unLen;

clearBitMask(Status2Reg, 0x08);   //TempSensclear

clearBitMask(CollReg,0x80);     //ValuesAfterColl

writeMFRC522(BitFramingReg, 0x00);    //TxLastBists = BitFramingReg\[2..0\]

serNum\[0\] = PICC\_ANTICOLL;

serNum\[1\] = 0x20;

status = MFRC522ToCard(PCD\_TRANSCEIVE, serNum, 2, serNum, &unLen);

if (status == MI\_OK)

//校验卡序列号

for (i=0; i<4; i++)\{

\*(serNum+i)  = serNum\[i\];

serNumCheck ^= serNum\[i\];

if (serNumCheck != serNum\[i\])\{

status = MI\_ERR;

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

return status;

void RFID\_halt()

unsigned char status;

unsigned int unLen;

unsigned char buff\[4\];

buff\[0\] = PICC\_HALT;

buff\[1\] = 0;

calculateCRC(buff, 2, &buff\[2\]);

status = MFRC522ToCard(PCD\_TRANSCEIVE, buff, 4, buff,&unLen);

int main()\{

unsigned char s;

unsigned char id\[10\];

int i;

if (!bcm2835\_init()) return -1;

RFID\_init();

while(1)\{

if (findCard(0x52,&s)==MI\_OK)\{

if ( anticoll(id)==MI\_OK)\{

for(i=0;i<5;i++)  printf("%d ",id\[i\]);

printf("\\n");

\} else printf("ERR\\n");

sleep(1);

bcm2835\_spi\_end();

bcm2835\_close();

return 0;

RFID.h:

\#define MAX\_LEN 18

//MF522命令字

\#define PCD\_IDLE              0x00               //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

\#define PICC\_ANTICOLL1        0x93               //防冲撞

\#define PICC\_ANTICOLL2        0x95               //防冲撞

\#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               //扣款

\#define PICC\_INCREMENT        0xC1               //充值

\#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

//MF522 FIFO长度定义

\#define DEF\_FIFO\_LENGTH       64                 //FIFO size=64byte

//MF522寄存器定义

// PAGE 0

\#define     RFU00                 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     RFU0F                 0x0F

// PAGE 1

\#define     RFU10                 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     RFU1A                 0x1A

\#define     RFU1B                 0x1B

\#define     MifareReg             0x1C

\#define     RFU1D                 0x1D

\#define     RFU1E                 0x1E

\#define     SerialSpeedReg        0x1F

// PAGE 2

\#define     RFU20                 0x20

\#define     CRCResultRegM         0x21

\#define     CRCResultRegL         0x22

\#define     RFU23                 0x23

\#define     ModWidthReg           0x24

\#define     RFU25                 0x25

\#define     RFCfgReg              0x26

\#define     GsNReg                0x27

\#define     CWGsCfgReg            0x28

\#define     ModGsCfgReg           0x29

\#define     TModeReg              0x2A

\#define     TPrescalerReg         0x2B

\#define     TReloadRegH           0x2C

\#define     TReloadRegL           0x2D

\#define     TCounterValueRegH     0x2E

\#define     TCounterValueRegL     0x2F

// PAGE 3

\#define     RFU30                 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     RFU3C                 0x3C

\#define     RFU3D                 0x3D

\#define     RFU3E                 0x3E

\#define     RFU3F    0x3F

//和MF522通讯时返回的错误代码

\#define MI\_OK                          0

\#define MI\_NOTAGERR                    (-1)

\#define MI\_ERR                         (-2)

[http_www.airspayce.com_mikem_bcm2835]: http://www.airspayce.com/mikem/bcm2835/

RC522模块

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