Arduino - EEPROMPut - Weblessons

EEPROM

put()

Description

Write any data type or object to the EEPROM.

Syntax

EEPROM.put(address, data)

Parameters

address: the location to write to, starting from 0 (int)

data: the data to write, can be a primitive type (eg. float) or a custom struct

Returns

A reference to the data passed in

Note

This function uses EEPROM.update() to perform the write, so does not rewrites the value if it didn't change.

Example

/***
eeprom_put example. This shows how to use the EEPROM.put() method.
Also, this sketch will pre-set the EEPROM data for the
example sketch eeprom_get. Note, unlike the single byte version EEPROM.write(),
the put method will use update semantics. As in a byte
will only be written to the EEPROM if the data is actually
different. Written by Christopher Andrews 2015
Released under MIT licence.
***/ #include <EEPROM.h> struct MyObject {
float field1;
byte field2;
char name[ 10 ] ;
} ; void setup ( ) { Serial.begin ( 9600 ) ;
while ( ! Serial ) {
; // wait for serial port to connect. Needed for native USB port only
} float f = 123.456f ; //Variable to store in EEPROM.
int eeAddress = 0 ; //Location we want the data to be put.
//One simple call, with the address first and the object second.
EEPROM.put (eeAddress, f) ; Serial.println ( "Written float data type!" ) ; /** Put is designed for use with custom structures also. **/ //Data to store.
MyObject customVar = {
3.14f ,
65 ,
"Working!"
} ; eeAddress += sizeof( float ) ; //Move address to the next byte after float 'f'. EEPROM.put (eeAddress, customVar) ;
Serial.print ( "Written custom data type! \n \nView the example sketch eeprom_get to see how you can retrieve the values!" ) ;
} void loop ( ) {
/* Empty loop */
}