#define EEPROM_START 0
boolean setEEPROM = false;
uint32_t memcrc;

struct eeprom_data_t {
  bool STAenabled;
  char STAssid[32];
  char STApass[32];
} eeprom_data;

static PROGMEM prog_uint32_t crc_table[16] = {
  0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
  0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
};

// ----------------------------------- read_settings -----------------------------------
void read_settings() {
  DBG_PRINTLN("Read settings from EEPROM ");
  int i = EEPROM_START;
  uint32_t datacrc;
  EEPROM.begin(sizeof(eeprom_data) + sizeof(memcrc));
  while (i < sizeof(eeprom_data)) *((byte *)&eeprom_data + i) = EEPROM.read(i++);
  *((byte*)&memcrc) = EEPROM.read(i++);
  *((byte*)&memcrc + 1) = EEPROM.read(i++);
  *((byte*)&memcrc + 2) = EEPROM.read(i++);
  *((byte*)&memcrc + 3) = EEPROM.read(i);
  datacrc = crc_byte((byte *)&eeprom_data, sizeof(eeprom_data));
  if (!(setEEPROM = (memcrc == datacrc))) reset_settings();

}
//----------------------------------------reset_settings
void reset_settings() {
  DBG_PRINTLN("Set defaults settings");
  eeprom_data.STAenabled = DEFAULT_STA_ENABLED;
  strncpy(eeprom_data.STAssid, STA_SSID_DEFAULT, sizeof(STA_SSID_DEFAULT));
  strncpy(eeprom_data.STApass, STA_PASSWORD_DEFAULT, sizeof(STA_PASSWORD_DEFAULT));
  write_settings();
}

// ----------------------------------- write_settings -----------------------------------
void write_settings() {
  DBG_PRINTLN("Write settings to EEPROM");
  int i = EEPROM_START;
  EEPROM.begin(sizeof(eeprom_data) + sizeof(memcrc));
  while (i < sizeof(eeprom_data))   {
    EEPROM.write(i, *((byte *)&eeprom_data + i));
    i++  ;
  }
  memcrc = crc_byte((byte *)&eeprom_data, sizeof(eeprom_data));
  EEPROM.write(i++, *((byte*)&memcrc));
  EEPROM.write(i++, *((byte*)&memcrc + 1));
  EEPROM.write(i++, *((byte*)&memcrc + 2));
  EEPROM.write(i, *((byte*)&memcrc + 3));
  EEPROM.commit();
}
//######################################################################EEPROM_END##########################