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StoreNameAndSurname.ino
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StoreNameAndSurname.ino
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/******************************************************************************************************************************************
StoreNameAndSurname.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_SAMD with an API that is similar to the EEPROM library to Store and retrieve structured data.
//#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;
// Create a structure that is big enough to contain a name
// and a surname. The "valid" variable is set to "true" once
// the structure is filled with actual data for the first time.
typedef struct
{
char name[100];
char surname[100];
} Person;
void setup()
{
Serial.begin(115200);
while (!Serial);
delay(200);
Serial.print(F("\nStart StoreNameAndSurname 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;
// Create a "Person" variable and call it "owner"
uint16_t storedAddress = 0;
Person owner;
EEPROM.get(storedAddress, signature);
// If the EEPROM is empty then no WRITTEN_SIGNATURE
if (signature == WRITTEN_SIGNATURE)
{
EEPROM.get(storedAddress + sizeof(signature), owner);
// Say hello to the returning user!
Serial.print("Hi ");
Serial.print(owner.name);
Serial.print(" ");
Serial.print(owner.surname);
Serial.println(", nice to see you again :-)");
Serial.println("Clearing WRITTEN_SIGNATURE for next try");
EEPROM.put(0, 0);
Serial.println("Done clearing signature in emulated EEPROM. You can reset now");
}
else
{
Serial.println("EEPROM is empty, writing WRITTEN_SIGNATURE and some example data:");
EEPROM.put(storedAddress, WRITTEN_SIGNATURE);
// ...in this case we ask for user data.
Serial.setTimeout(30000);
Serial.print("Insert your name : ");
String name = Serial.readStringUntil('\n');
Serial.println(name);
Serial.print("Insert your surname : ");
String surname = Serial.readStringUntil('\n');
Serial.println(surname);
// Fill the "owner" structure with the data entered by the user...
name.toCharArray(owner.name, 100);
surname.toCharArray(owner.surname, 100);
// ...and finally save everything into emulated-EEPROM
EEPROM.put(storedAddress + sizeof(signature), owner);
if (!EEPROM.getCommitASAP())
{
Serial.println("CommitASAP not set. Need commit()");
EEPROM.commit();
}
// Print a confirmation of the data inserted.
Serial.print("<< Your name: ");
Serial.print(owner.name);
Serial.print(". Your surname: ");
Serial.print(owner.surname);
Serial.println(" >> have been saved. Thank you!");
Serial.println("You can reset to check emulated-EEPROM data retention.");
}
}
void loop()
{
// Do nothing...
}