//-----------------------------------------------------------------------------
// Copyright (C) 2020 tharexde
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Low frequency EM4x50 structs
//-----------------------------------------------------------------------------

#ifndef EM4X50_H__
#define EM4X50_H__

#include "common.h"

#define EM4X50_NO_WORDS             34

// special words
#define EM4X50_DEVICE_PASSWORD      0
#define EM4X50_PROTECTION           1
#define EM4X50_CONTROL              2
#define EM4X50_DEVICE_SERIAL        32
#define EM4X50_DEVICE_ID            33

// control word (word = 4 bytes)
#define FIRST_WORD_READ             0       // first byte
#define LAST_WORD_READ              1       // second byte
#define CONFIG_BLOCK                2       // third byte
#define PASSWORD_CHECK              0x80    // first bit in third byte
#define READ_AFTER_WRITE            0x40    // second bit in third byte

// protection word
#define FIRST_WORD_READ_PROTECTED   0       // first byte
#define LAST_WORD_READ_PROTECTED    1       // second byte
#define FIRST_WORD_WRITE_INHIBITED  2       // third byte
#define LAST_WORD_WRITE_INHIBITED   3       // fourth byte

// commands
#define EM4X50_COMMAND_LOGIN                0x01
#define EM4X50_COMMAND_RESET                0x80
#define EM4X50_COMMAND_WRITE                0x12
#define EM4X50_COMMAND_WRITE_PASSWORD       0x11
#define EM4X50_COMMAND_SELECTIVE_READ       0x0A
#define EM4X50_COMMAND_STANDARD_READ        0x02 // virtual command

// misc
#define TIMEOUT_CMD                 3000
#define DUMP_FILESIZE               136

typedef struct {
    bool addr_given;
    bool pwd_given;
    uint32_t password1;
    uint32_t password2;
    uint32_t word;
    uint32_t addresses;
} PACKED em4x50_data_t;

typedef struct {
    uint8_t byte[4];
} PACKED em4x50_word_t;

extern bool gLogin;
extern bool gWritePasswordProcess;
extern uint32_t gPassword;

#endif /* EM4X50_H__ */