RFID-RC522是一个淘宝上比较常见的一个识别RFID的一个模块。他可以做到对RFID的读写。
MF RC522 是应用于13.56MHz 非接触式通信中高集成度读写卡系列芯片中的一员。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
##RFID读写卡的过程
读写卡主要有五个步骤：寻卡，防冲突，选卡，认证，读/写卡。
###寻卡
// REQ_ALL代表寻天线区内所有卡，TagType为返回的卡的类型
status= PcdRequest( REQ_ALL , TagType );TagType返回的卡类型有：
0x4400 = Mifare_UltraLight
0x0400 = Mifare_One(S50)
0x0200 = Mifare_One(S70)
0x0800 = Mifare_Pro(X)
0x4403 = Mifare_DESFire
###防冲突
if(!status)
{
status = PcdAnticoll(SelectedSnr);
// ......
}###认证
if(!status)
{
// 认证
snr = 1; // 扇区号1
status = PcdAuthState(KEYA, (snr*4+3), DefaultKey, SelectedSnr); // 校验1扇区密码，密码位于每一扇区第3块
// ......
}四个参数分别是：验证A密钥，块地址，扇区密码，卡序列号
###读写卡
if(!status)
{
//读写卡
status = PcdRead((snr*4+0), buf); // 读卡，读取1扇区0块数据到buf[0]-buf[16]
status = PcdWrite((snr*4+0), "way2"); // 写卡，将buf[0]-buf[16]写入1扇区0块
if(!status)
{
//读写成功
printf("read finish!\n");
printf("读到的值是： %s\n",buf);
WaitCardOff();
}
}##代码
以下为核心代码：
main.c
#include "stm32f10x.h"
#include "delay.h"
#include "bsp_usart.h"
#include "RC522.h"
int main()
{
char status;
unsigned char snr, buf[16], TagType[2], SelectedSnr[4], DefaultKey[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
delay_init();
usart_init();
PcdInit();
PcdReset();
PcdAntennaOff();
PcdAntennaOn();
M500PcdConfigISOType( 'A' );
printf( "init over!\n" );
while(1){
// 寻卡
status= PcdRequest( REQ_ALL , TagType ); // REQ_ALL代表寻天线区内所有卡。TagType为返回的卡类型
if(!status)
{
// 防冲突
status = PcdAnticoll(SelectedSnr);
if(!status)
{
// 选卡
status=PcdSelect(SelectedSnr);
if(!status)
{
// 认证
snr = 1; // 扇区号1
status = PcdAuthState(KEYA, (snr*4+3), DefaultKey, SelectedSnr); // 校验1扇区密码，密码位于每一扇区第3块
// 验证A密钥，块地址，扇区密码，卡序列号
{
if(!status)
{
//读写卡
status = PcdRead((snr*4+0), buf); // 读卡，读取1扇区0块数据到buf[0]-buf[16]
// status = PcdWrite((snr*4+0), "way2"); // 写卡，将buf[0]-buf[16]写入1扇区0块
if(!status)
{
//读写成功
printf("read finish!\n");
printf("读到的值是： %s\n",buf);
WaitCardOff();
}
}
}
}
}
}
}
}
RC522.h
#ifndef __RC522_H
#define __RC522_H
#define MF522_RST_PIN GPIO_Pin_11
#define MF522_RST_PORT GPIOB
#define MF522_RST_CLK RCC_APB2Periph_GPIOB
#define MF522_MISO_PIN GPIO_Pin_10
#define MF522_MISO_PORT GPIOB
#define MF522_MISO_CLK RCC_APB2Periph_GPIOB
#define MF522_MOSI_PIN GPIO_Pin_1
#define MF522_MOSI_PORT GPIOB
#define MF522_MOSI_CLK RCC_APB2Periph_GPIOB
#define MF522_SCK_PIN GPIO_Pin_0
#define MF522_SCK_PORT GPIOB
#define MF522_SCK_CLK RCC_APB2Periph_GPIOB
#define MF522_NSS_PIN GPIO_Pin_7
#define MF522_NSS_PORT GPIOA
#define MF522_NSS_CLK RCC_APB2Periph_GPIOA
#define RST_H GPIO_SetBits(MF522_RST_PORT, MF522_RST_PIN)
#define RST_L GPIO_ResetBits(MF522_RST_PORT, MF522_RST_PIN)
#define MOSI_H GPIO_SetBits(MF522_MOSI_PORT, MF522_MOSI_PIN)
#define MOSI_L GPIO_ResetBits(MF522_MOSI_PORT, MF522_MOSI_PIN)
#define SCK_H GPIO_SetBits(MF522_SCK_PORT, MF522_SCK_PIN)
#define SCK_L GPIO_ResetBits(MF522_SCK_PORT, MF522_SCK_PIN)
#define NSS_H GPIO_SetBits(MF522_NSS_PORT, MF522_NSS_PIN)
#define NSS_L GPIO_ResetBits(MF522_NSS_PORT, MF522_NSS_PIN)
#define READ_MISO GPIO_ReadInputDataBit(MF522_MISO_PORT, MF522_MISO_PIN)
// 函数原型
void PcdInit(void);
char PcdReset(void);
void PcdAntennaOn(void);
void PcdAntennaOff(void);
char PcdRequest(unsigned char req_code,unsigned char *pTagType);
char PcdAnticoll(unsigned char *pSnr);
char PcdSelect(unsigned char *pSnr);
char PcdAuthState(unsigned char auth_mode,unsigned char addr,unsigned char *pKey,unsigned char *pSnr);
char PcdRead(unsigned char addr,unsigned char *pData);
char PcdWrite(unsigned char addr,unsigned char *pData);
char PcdValue(unsigned char dd_mode,unsigned char addr,unsigned char *pValue);
char PcdBakValue(unsigned char sourceaddr, unsigned char goaladdr);
char PcdHalt(void);
char PcdComMF522(unsigned char Command,
unsigned char *pInData,
unsigned char InLenByte,
unsigned char *pOutData,
unsigned int *pOutLenBit);
void CalulateCRC(unsigned char *pIndata,unsigned char len,unsigned char *pOutData);
void WriteRawRC(unsigned char Address,unsigned char value);
unsigned char ReadRawRC(unsigned char Address);
void SetBitMask(unsigned char reg,unsigned char mask);
void ClearBitMask(unsigned char reg,unsigned char mask);
char M500PcdConfigISOType(unsigned char type);
void delay_10ms(unsigned int _10ms);
void WaitCardOff(void);
// 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_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 ComIEnReg 0x02
#define DivlEnReg 0x03
#define ComIrqReg 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
#define REQ_ALL 0x52
#define KEYA 0x60
// 和MF522通讯时返回的错误代码
#define MI_OK (char)0
#define MI_NOTAGERR (char)(-1)
#define MI_ERR (char)(-2)
#endif
RC522.c
#include "RC522.H"
#include "stm32f10x_gpio.h"
#define MAXRLEN 18
void PcdInit()
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable the GPIO Clock */
RCC_APB2PeriphClockCmd(MF522_RST_CLK, ENABLE);
/* Configure the GPIO pin */
GPIO_InitStructure.GPIO_Pin = MF522_RST_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(MF522_RST_PORT, &GPIO_InitStructure);
/* Enable the GPIO Clock */
RCC_APB2PeriphClockCmd(MF522_MISO_CLK, ENABLE);
/* Configure the GPIO pin */
GPIO_InitStructure.GPIO_Pin = MF522_MISO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(MF522_MISO_PORT, &GPIO_InitStructure);
/* Enable the GPIO Clock */
RCC_APB2PeriphClockCmd(MF522_MOSI_CLK, ENABLE);
/* Configure the GPIO pin */
GPIO_InitStructure.GPIO_Pin = MF522_MOSI_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(MF522_MOSI_PORT, &GPIO_InitStructure);
/* Enable the GPIO Clock */
RCC_APB2PeriphClockCmd(MF522_SCK_CLK, ENABLE);
/* Configure the GPIO pin */
GPIO_InitStructure.GPIO_Pin = MF522_SCK_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(MF522_SCK_PORT, &GPIO_InitStructure);
/* Enable the GPIO Clock */
RCC_APB2PeriphClockCmd(MF522_NSS_CLK, ENABLE);
/* Configure the GPIO pin */
GPIO_InitStructure.GPIO_Pin = MF522_NSS_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(MF522_NSS_PORT, &GPIO_InitStructure);
}
//功 能：寻卡
//参数说明: req_code[IN]:寻卡方式
// 0x52 = 寻感应区内所有符合14443A标准的卡
// 0x26 = 寻未进入休眠状态的卡
// pTagType[OUT]：卡片类型代码
// 0x4400 = Mifare_UltraLight
// 0x0400 = Mifare_One(S50)
// 0x0200 = Mifare_One(S70)
// 0x0800 = Mifare_Pro(X)
// 0x4403 = Mifare_DESFire
//返 回: 成功返回MI_OK
char PcdRequest(unsigned char req_code,unsigned char *pTagType)
{
char status;
unsigned int unLen;
unsigned char ucComMF522Buf[MAXRLEN];
// unsigned char xTest ;
ClearBitMask(Status2Reg,0x08);
WriteRawRC(BitFramingReg,0x07);
// xTest = ReadRawRC(BitFramingReg);
// if(xTest == 0x07 )
// { LED_GREEN =0 ;}
// else {LED_GREEN =1 ;while(1){}}
SetBitMask(TxControlReg,0x03);
ucComMF522Buf[0] = req_code;
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,1,ucComMF522Buf,&unLen);
// if(status == MI_OK )
// { LED_GREEN =0 ;}
// else {LED_GREEN =1 ;}
if ((status == MI_OK) && (unLen == 0x10))
{
*pTagType = ucComMF522Buf[0];
*(pTagType+1) = ucComMF522Buf[1];
}
else
{ status = MI_ERR; }
return status;
}
//功 能：防冲撞
//参数说明: pSnr[OUT]:卡片序列号，4字节
//返 回: 成功返回MI_OK
char PcdAnticoll(unsigned char *pSnr)
{
char status;
unsigned char i,snr_check=0;
unsigned int unLen;
unsigned char ucComMF522Buf[MAXRLEN];
ClearBitMask(Status2Reg,0x08);
WriteRawRC(BitFramingReg,0x00);
ClearBitMask(CollReg,0x80);
ucComMF522Buf[0] = PICC_ANTICOLL1;
ucComMF522Buf[1] = 0x20;
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,2,ucComMF522Buf,&unLen);
if (status == MI_OK)
{
for (i=0; i<4; i++)
{
*(pSnr+i) = ucComMF522Buf[i];
snr_check ^= ucComMF522Buf[i];
}
if (snr_check != ucComMF522Buf[i])
{ status = MI_ERR; }
}
SetBitMask(CollReg,0x80);
return status;
}
//功 能：选定卡片
//参数说明: pSnr[IN]:卡片序列号，4字节
//返 回: 成功返回MI_OK
char PcdSelect(unsigned char *pSnr)
{
char status;
unsigned char i;
unsigned int unLen;
unsigned char ucComMF522Buf[MAXRLEN];
ucComMF522Buf[0] = PICC_ANTICOLL1;
ucComMF522Buf[1] = 0x70;
ucComMF522Buf[6] = 0;
for (i=0; i<4; i++)
{
ucComMF522Buf[i+2] = *(pSnr+i);
ucComMF522Buf[6] ^= *(pSnr+i);
}
CalulateCRC(ucComMF522Buf,7,&ucComMF522Buf[7]);
ClearBitMask(Status2Reg,0x08);
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,9,ucComMF522Buf,&unLen);
if ((status == MI_OK) && (unLen == 0x18))
{ status = MI_OK; }
else
{ status = MI_ERR; }
return status;
}
//功 能：验证卡片密码
//参数说明: auth_mode[IN]: 密码验证模式
// 0x60 = 验证A密钥
// 0x61 = 验证B密钥
// addr[IN]：块地址
// pKey[IN]：密码
// pSnr[IN]：卡片序列号，4字节
//返 回: 成功返回MI_OK
char PcdAuthState(unsigned char auth_mode,unsigned char addr,unsigned char *pKey,unsigned char *pSnr)
{
char status;
unsigned int unLen;
unsigned char i,ucComMF522Buf[MAXRLEN];
ucComMF522Buf[0] = auth_mode;
ucComMF522Buf[1] = addr;
for (i=0; i<6; i++)
{ ucComMF522Buf[i+2] = *(pKey+i); }
for (i=0; i<6; i++)
{ ucComMF522Buf[i+8] = *(pSnr+i); }
// memcpy(&ucComMF522Buf[2], pKey, 6);
// memcpy(&ucComMF522Buf[8], pSnr, 4);
status = PcdComMF522(PCD_AUTHENT,ucComMF522Buf,12,ucComMF522Buf,&unLen);
if ((status != MI_OK) || (!(ReadRawRC(Status2Reg) & 0x08)))
{ status = MI_ERR; }
return status;
}
//功 能：读取M1卡一块数据
//参数说明: addr[IN]：块地址
// pData[OUT]：读出的数据，16字节
//返 回: 成功返回MI_OK
char PcdRead(unsigned char addr,unsigned char *pData)
{
char status;
unsigned int unLen;
unsigned char i,ucComMF522Buf[MAXRLEN];
ucComMF522Buf[0] = PICC_READ;
ucComMF522Buf[1] = addr;
CalulateCRC(ucComMF522Buf,2,&ucComMF522Buf[2]);
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,4,ucComMF522Buf,&unLen);
if ((status == MI_OK) && (unLen == 0x90))
// { memcpy(pData, ucComMF522Buf, 16); }
{
for (i=0; i<16; i++)
{ *(pData+i) = ucComMF522Buf[i]; }
}
else
{ status = MI_ERR; }
return status;
}
//功 能：写数据到M1卡一块
//参数说明: addr[IN]：块地址
// pData[IN]：写入的数据，16字节
//返 回: 成功返回MI_OK
char PcdWrite(unsigned char addr,unsigned char *pData)
{
char status;
unsigned int unLen;
unsigned char i,ucComMF522Buf[MAXRLEN];
ucComMF522Buf[0] = PICC_WRITE;
ucComMF522Buf[1] = addr;
CalulateCRC(ucComMF522Buf,2,&ucComMF522Buf[2]);
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,4,ucComMF522Buf,&unLen);
if ((status != MI_OK) || (unLen != 4) || ((ucComMF522Buf[0] & 0x0F) != 0x0A))
{ status = MI_ERR; }
if (status == MI_OK)
{
//memcpy(ucComMF522Buf, pData, 16);
for (i=0; i<16; i++)
{ ucComMF522Buf[i] = *(pData+i); }
CalulateCRC(ucComMF522Buf,16,&ucComMF522Buf[16]);
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,18,ucComMF522Buf,&unLen);
if ((status != MI_OK) || (unLen != 4) || ((ucComMF522Buf[0] & 0x0F) != 0x0A))
{ status = MI_ERR; }
}
return status;
}
//功 能：命令卡片进入休眠状态
//返 回: 成功返回MI_OK
char PcdHalt(void)
{
unsigned int unLen;
unsigned char ucComMF522Buf[MAXRLEN];
ucComMF522Buf[0] = PICC_HALT;
ucComMF522Buf[1] = 0;
CalulateCRC(ucComMF522Buf,2,&ucComMF522Buf[2]);
PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,4,ucComMF522Buf,&unLen);
return MI_OK;
}
//用MF522计算CRC16函数
void CalulateCRC(unsigned char *pIndata,unsigned char len,unsigned char *pOutData)
{
unsigned char i,n;
ClearBitMask(DivIrqReg,0x04);
WriteRawRC(CommandReg,PCD_IDLE);
SetBitMask(FIFOLevelReg,0x80);
for (i=0; i