/******************************************************************************************************************************************
  EEPROM_update.ino
  For SAMD21/SAMD51 using Flash emulated-EEPROM

  The FlashStorage_SAMD library aims to provide a convenient way to store and retrieve user's data using the non-volatile flash memory
  of SAMD21/SAMD51. It now supports writing and reading the whole object, not just byte-and-byte.

  Based on and modified from Cristian Maglie's FlashStorage (https://github.com/cmaglie/FlashStorage)

  Built by Khoi Hoang https://github.com/khoih-prog/FlashStorage_SAMD
  Licensed under LGPLv3 license
  
  Orginally written by A. Christian
  
  Copyright (c) 2015-2016 Arduino LLC.  All right reserved.
  Copyright (c) 2020 Khoi Hoang.
  
  This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License 
  as published bythe Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
  You should have received a copy of the GNU Lesser General Public License along with this library. 
  If not, see (https://www.gnu.org/licenses/)
 ******************************************************************************************************************************************/
/***
   EEPROM Update method

   Stores values read from analog input 0 into the EEPROM.
   These values will stay in the EEPROM when the board is
   turned off and may be retrieved later by another sketch.

   If a value has not changed in the EEPROM, it is not overwritten
   which would reduce the life span of the EEPROM unnecessarily.

   Released using MIT licence.
 ***/

//#define EEPROM_EMULATION_SIZE     (4 * 1024)

// Use 0-2. Larger for more debugging messages
#define FLASH_DEBUG       0

#include <FlashStorage_SAMD.h>

/** the current address in the EEPROM (i.e. which byte we're going to write to next) **/
int address = 0;

void setup()
{
  Serial.begin(115200);
  while (!Serial);

  delay(200);

  Serial.print(F("\nStart EEPROM_read on ")); Serial.println(BOARD_NAME);
  Serial.println(FLASH_STORAGE_SAMD_VERSION);

  Serial.print("EEPROM length: ");
  Serial.println(EEPROM.length());
}

void loop()
{
  unsigned long startMillis = millis();
  
  for (int i = 0 ; i < EEPROM.length() ; i++) 
  {
    /***
      The function EEPROM.update(address, val) is equivalent to the following:
  
      if( EEPROM.read(address) != val )
      {
        EEPROM.write(address, val);
      }
    ***/
    EEPROM.update(i, (uint8_t) analogRead(0));
  }
  
  EEPROM.commit();

  Serial.print("Done updating emulated EEPROM. Time spent (ms) = "); Serial.println(millis() - startMillis);

  delay(60000);
}
