//************************************
// Variables
//************************************
__flash u16_t crc16_8408_table [256] =
{
  0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
  0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
  0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
  0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
  0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
  0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
  0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
  0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
  0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
  0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
  0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
  0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
  0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
  0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
  0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
  0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
  0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
  0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
  0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
  0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
  0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
  0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
  0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
  0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
  0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
  0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
  0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
  0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
  0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
  0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
  0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
  0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};

//************************************
// Prototypes
//************************************
void Do_CRC16_8408(u16_t *crc16_8408, u8_t input_data);
void Do_CRC16_8408_Buf(u16_t *crc16_8408, u16_t len, u8_t *buf);
void Do_EEPROM_CRC16_8408_Buf(u16_t *crc16_8408, u16_t len, u8_t __eeprom *buf);
//void Do_FLASH_CRC16_8408_Buf(u16_t *crc16_8408, u16_t len, u8_t __flash *buf);

//::::::::::::::::::::::::::::::::::::::::::::::::::::::
// Расчет CRC16 байта данных
//::::::::::::::::::::::::::::::::::::::::::::::::::::::
void Do_CRC16_8408(u16_t *crc16_8408, u8_t input_data)
{
  *crc16_8408 = crc16_8408_table[(u8_t)(*crc16_8408) ^ input_data] ^ ((*crc16_8408) >> 8);
}

//::::::::::::::::::::::::::::::::::::::::::::::::::::::
// Расчет CRC16 блока данных
//::::::::::::::::::::::::::::::::::::::::::::::::::::::
void Do_CRC16_8408_Buf(u16_t *crc16_8408, u16_t len, u8_t *buf)
{
  u16_t i = 0;
  do
  {
    Do_CRC16_8408(crc16_8408, *(buf + i));
    i++;
  }while(i<len);
}


//::::::::::::::::::::::::::::::::::::::::::::::::::::::
// Расчет CRC16 блока данных в eeprom
//::::::::::::::::::::::::::::::::::::::::::::::::::::::
void Do_EEPROM_CRC16_8408_Buf(u16_t *crc16_8408, u16_t len, u8_t __eeprom *buf)
{
  u16_t i = 0;
  do
  {
    Do_CRC16_8408(crc16_8408, *(buf + i));
    i++;
  }while(i<len);
}

/*
//::::::::::::::::::::::::::::::::::::::::::::::::::::::
// Расчет CRC16 блока данных во flash
//::::::::::::::::::::::::::::::::::::::::::::::::::::::
void Do_FLASH_CRC16_8408_Buf(u16_t *crc16_8408, u16_t len, u8_t __flash *buf)
{
  u16_t i = 0;

  do
  {
    Do_CRC16_8408(crc16_8408, *(buf + i));
    i++;
  }while(i<len);
}
*/


//Серийный номер
typedef struct serial_data
{
  u32_t number;
  u16_t crc16;
}serial_t;

//Основной блок данных серийного номера
__no_init __eeprom serial_t serial_base @0x0004;
//Копия серийного номера
__no_init __eeprom serial_t serial_copy @0x000A;

//::::::::::::::::::::::::::::::::::::::::::::::::::::::
// Проверка целостности серийного номера
// 0 - данные повреждены
// 1 - данные целы
// 2 - данные восстановлены
//::::::::::::::::::::::::::::::::::::::::::::::::::::::
u8_t Cnfg_Check_Serial(void)
{
  u16_t crc16_base = CRC16_INI;
  u16_t crc16_copy = CRC16_INI;

  Do_EEPROM_CRC16_8408_Buf((u16_t*)&crc16_base, sizeof(serial_base), (u8_t __eeprom*)&serial_base);
  Do_EEPROM_CRC16_8408_Buf((u16_t*)&crc16_copy, sizeof(serial_copy), (u8_t __eeprom*)&serial_copy);

  if((crc16_base == crc16_copy) && (crc16_base == 0))
  {
    //Данные целы
    return 1;
  }
    else
    {
      if(crc16_base == 0)
      {
        //Повреждена копия - скопируем с основной
        serial_copy = serial_base;
        return 2;
      }
        else
        {
          if (crc16_copy == 0)
          {
            //Поврежден основной блок данных - скопируем из копии
            serial_base = serial_copy;
            return 2;
          }
            else
            {
              //Повреждена и резервная и основная часть
              return 0;
            }
        }
    }
}