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EmulateEEPROM.ino
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EmulateEEPROM.ino
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/******************************************************************************************************************************************
EmulatedEEPROM.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/)
******************************************************************************************************************************************/
// Demonstrate how to use FlashStorage_STM32 with an API that is similar to the EEPROM library.
//#define EEPROM_EMULATION_SIZE (4 * 1024)
// Use 0-2. Larger for more debugging messages
#define FLASH_DEBUG 0
// To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error
#include <FlashStorage_SAMD.h>
const int WRITTEN_SIGNATURE = 0xBEEFDEED;
void setup()
{
Serial.begin(115200);
while (!Serial);
delay(200);
Serial.print(F("\nStart EmulatedEEPROM on "));
Serial.println(BOARD_NAME);
Serial.println(FLASH_STORAGE_SAMD_VERSION);
Serial.print("EEPROM length: ");
Serial.println(EEPROM.length());
// Check signature at address 0
int signature;
EEPROM.get(0, signature);
// If the EEPROM is empty then no WRITTEN_SIGNATURE
if (signature != WRITTEN_SIGNATURE)
{
Serial.println("EEPROM is empty, writing WRITTEN_SIGNATURE and some example data:");
EEPROM.put(0, WRITTEN_SIGNATURE);
Serial.print("->");
for (int i = sizeof(WRITTEN_SIGNATURE); i < 20; i++)
{
EEPROM.write(i, 100 + i);
Serial.print(" ");
Serial.print(100 + i);
}
// commit() saves all the changes to EEPROM, it must be called
// every time the content of virtual EEPROM is changed to make
// the change permanent.
// This operation burns Flash write cycles and should not be
// done too often. See readme for details:
// https://github.com/khoih-prog/FlashStorage_SAMD#limited-number-of-writes
EEPROM.commit();
Serial.println("\nDone writing to emulated EEPROM. You can reset now to test");
}
else
{
EEPROM.get(0, signature);
Serial.print("EEPROM has been written.Signature = 0x");
Serial.println(signature, HEX);
Serial.println("Here is the content of the next 16 bytes:");
Serial.print("->");
for (int i = sizeof(WRITTEN_SIGNATURE); i < 20; i++)
{
Serial.print(" ");
Serial.print(EEPROM.read(i));
}
Serial.println("\nClearing WRITTEN_SIGNATURE for next try");
EEPROM.put(0, 0);
if (!EEPROM.getCommitASAP())
{
Serial.println("CommitASAP not set. Need commit()");
EEPROM.commit();
}
Serial.println("Done clearing signature in emulated EEPROM. You can reset now");
}
}
void loop()
{
}