RC522模块

原创

jenslee 2022-02-03 14:27:54 博主文章分类：树莓派 ©著作权

文章标签 #define 数据 ico 文章分类 代码人生

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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

#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)

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