EEPROM_Check

EEPROM.ino

#include <Arduino.h>
#include <EEPROM.h>

#define MAGIC_BYTE 0xDD

bool checkInit() {
  return (EEPROM.read(0) == MAGIC_BYTE);
}

void initializeEEPROM() {
  Serial.printf("Initializing EEPROM\r\n");
  EEPROM.write(0, MAGIC_BYTE);
  for (int i=1; i<5; i++) {
    EEPROM.write(i, i);
  }
  EEPROM.commit();
}

void setup() {
  Serial.begin(115200); Serial.printf("\r\n\r\n");
  EEPROM.begin(5);
  if (!checkInit()) initializeEEPROM();

  for (int i=1; i<5; i++) {
    unsigned char x = EEPROM.read(i);
    Serial.printf("EEPROM.read(%d): %d\t", i, x);
    x++;
    Serial.printf("EEPROM.write(%d, %d)\r\n", i, x);
    EEPROM.write(i, x);
  }
  EEPROM.end();
}

void loop() {
  // put your main code here, to run repeatedly:
}