void initSD(){
retrieveFloatsFromEEPROM();

mainSystem.epsTemperature = EEPROMDATA[1];
mainSystem.targetTemperature = EEPROMDATA[0];

Serial.println(mainSystem.epsTemperature);

Serial.println(mainSystem.targetTemperature);

Serial.println("starting SD init");

if (!SD.begin(chipSelect)) {
  Serial.println("SD card initialization failed!"); // pas de carte SD - STOP COMPLET
  lcd.setCursor(0, 0);  // Set cursor to first column of first row
  lcd.print("SD PAS DETECTEE!");
  lcd.setCursor(0, 1);  // Set cursor to first column of first row
  lcd.print("ERREUR FATALE!!");
  while (true); // Halt execution
}

}




void retrieveFloatsFromEEPROM() {
  int address = eepromStartAddress;


  for (int i = 0; i < sdN; i++) {
    byte floatBytes[sizeof(float)];
    for (int j = 0; j < sizeof(float); j++) {
      float data = EEPROM.read(address++);
      if(isnan(data)){
        data = 5;
        Serial.println("no data in EEPROM");
      }
      floatBytes[j] = data;
    }
    EEPROMDATA[i] = *((float*)floatBytes);
  }
Serial.println(EEPROMDATA[0]);
Serial.println(EEPROMDATA[1]);
Serial.println("!!!!!");
    
    delay(2000);
  }




void updateParaData(){
int st = eepromStartAddress;
byte floatBytes[sizeof(float)];
Serial.println("lalala");
 for (int i = 0; i < sdN; i++) {
    *((float*)floatBytes) = EEPROMDATA[i];
    for (int j = 0; j < sizeof(float); j++) {
      EEPROM.update(st, floatBytes[j]);
      st++;
      Serial.println("writing");
      Serial.println(floatBytes[j]);
   

    }
  }

}



void LogBook(){

  Serial.println("attempting to open SD");

  String dataString = "";

  for (int i = 0; i < NCAPTEURS ; i++) {
    dataString += String(tabTemperature[i]);
    dataString += ",";
    dataString += String(tabHumidite[i]);
    if (i < NCAPTEURS-1){
      dataString += ",";
    }
  }

  Serial.println("attempting to open SD");

  File dataFile = SD.open("datalog.csv", FILE_WRITE);

  // if the file is available, write to it:
  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
    // print to the serial port too:
    Serial.println(dataString);
  }
  // if the file isn't open, pop up an error:
  else {
    Serial.println("error opening datalog.txt");
  }
}