NfcTag.h

#include "Arduino.h"
#include <Wire.h>

#ifndef __NFC_TAG_H__
#define __NFC_TAG_H__


#define EEPROM_ADDR_E2_DISABLE  0x53 //disable E2
#define EEPROM_ADDR_E2_ENABLE   (0x53|0x04) //enable E2 
#define EEPROM_I2C_LENGTH   8192

#define PASSWORD_LENGTH 4
#define SECTOR_SECURITY_STATUS_BASE_ADDR    0x800 //2048

#define LOCK_PROTECT_BIT        BIT0
#define WRITE_READ_PROTECT_BIT  BIT1
#define PASSWORD_CTRL_BIT       BIT3

#define I2C_PASSWORD_ADDR   2304
#define RF_PASSWORD_1_ADDR  2308
#define RF_PASSWORD_2_ADDR  2312
#define RF_PASSWORD_3_ADDR  2316
#define DSFID_ADDR          2320    //1 byte
#define AFI_ADDR            2321    //1 byte
#define RFU_ADDR            2322    //2 bytes
#define UID_ADDR            2324    //8 bytes
#define UID_LENGTH          8
#define MEMORY_VOLUME_ADDR  2332    //3 bytes
#define IC_NUMBER_ADDR      2335    //1 byte


enum AccessMode {
    USER_MODE = 0x0,    // offer simple read/write access right
    ROOT_MODE = 0x1,    // offer password change access right
};

enum SectorAccessRight {
    //      **********************************
    //      *  submit passWd *   no submit   *
    //b2,b1 *  Read * Write  *  Read * Write *
    // 00   *    1       1        1      0   *
    // 01   *    1       1        1      1   *
    // 10   *    1       1        0      0   *
    // 11   *    0       1        0      0   *
    //      **********************************
    Access_1110 = 0,
    Access_1111 = 1,
    Access_1100 = 2,
    Access_0111 = 3,
};

enum SectorSelectPassWd {
    //00 => no passWd protect
    //01 => passWd 1
    //10 => passWd 2
    //11 => passwd 3
    noPassWd = 0,
    passWd_1 = 1,
    passWd_2 = 2,
    passWd_3 = 3,
};

class NfcTag {
  public:
    NfcTag(AccessMode mode = USER_MODE) {
        if (mode == USER_MODE) {
            eeAddr = EEPROM_ADDR_E2_DISABLE;
        } else {
            eeAddr = EEPROM_ADDR_E2_ENABLE;
        }
    };
    void init();
    void submitPassWd(byte* passWd);
    void writePassWd(byte* passWd);
    void sectorProtectConfig(unsigned int sectorNumber, bool protectEnable, SectorAccessRight accessRight = Access_1110,
                             SectorSelectPassWd passWd = noPassWd);
    void clearSectorProtect(void);
    void sectorWriteSockConfig(unsigned int sectorNumber, bool sockEnable);
    byte getDSFID();
    byte getAFI();
    uint16_t getRFU();
    byte getUID(byte* buf);
    uint32_t getMemoryVolume();
    byte getICNumber();
    void clearMemory();
    void writeByte(unsigned int address, byte data);
    void writeBytes(unsigned int address, byte* buf, unsigned int len);
    byte readByte(unsigned int address);
    void readBytes(unsigned int address, byte* buf, unsigned int len);

  private:
    int eeAddr;
    void _EEPROM_Write_Byte(unsigned int address, byte data);
    void _EEPROM_Write_Bytes(unsigned int address, byte* buf, unsigned int len);
    byte _EEPROM_Read_Byte(unsigned int address);
    unsigned int _EEPROM_Read_Bytes(unsigned int address, byte* buf, unsigned int len);
};
#endif