EEPROM reading - writing string[SOLVED]!

Other Hardware Storage
1

Hello everyone!I'm trying to learn but i found enough difficulties about this board.Especially i 've got difficulties because i can't debug my code.
Could you help me for something?How can i write a string into the eeprom and after that how can i read it from memory???

Can you propose me any good website or book to make a start??

Thanks a lot!

2

Use EEPROM one byte at a time, like Serial.read().

3

Thanks for your reply!Be the way have you got anyone an example which can helps someone to store string char by char ( each byte per time ).

That will helps my job a lot !

Thanks

4

I want to write 300 characters into eeprom.In order to do something like that should i follow something like that??

String inputString = "";
int cbytes = 0;
char inChar;
void writeEEPROM(){
  if(Serial.available()) {
      c = (char)Serial.read();
      EEPROM.write( cbytes++,(byte)inChar );
        
      if( c== '\0' ) 
        Serial.print("Success");   
  }
}

The read process, if i want to took eeprom's data back??

void __read_EEPROM( )  {
  int _addrByte = 0;
  String str;
  int value;
  while( _addrByte++ != 300 )  {
    value = EEPROM.read( _addrByte );
     str += (char)(value);
    _addrByte++;  
  }
  Serial.print(str);
}

In terminal i take some results but my data are not return in the correct order, just i've send them....

Thanks!

5

When you are reading back from EEPROM you are incrementing the address twice:

void __read_EEPROM( )  {
  int _addrByte = 0;
  String str;
  int value;
  while( _addrByte++ != 300 )  {             //// HERE
    value = EEPROM.read( _addrByte );
     str += (char)(value);
    _addrByte++;                                 ///// And HERE
  }
  Serial.print(str);
}

Take the ++ off the first one. You may also want to add: if (value == 0) break; before str += (char)(value);. That way you won't put all 300 characters into str even when the string is only 20 characters long.

6

I've just seen it!
My mistake i'm sorry!

Thank you very much!

7

sirus:
I've just seen it!
My mistake i'm sorry!

Thank you very much!

that type is the c variable? You could send the sketch?

8

So Sirus has his anser and it is no more interesting for him to respond to your request, Venado_bike.

That´s h ow life is today :frowning:

9

Hello everyone.
i trying to save String data type in eeprom but i cant do it!
can you guide me . thanks alot.

10

magickiyan:
Hello everyone.
i trying to save String data type in eeprom but i cant do it!
can you guide me . thanks alot.

You have some code? You forgot to post it, or explain what the problem is.