esp8266/libraries/EEPROM/examples/eeprom_read/eeprom_read.ino

/*
   EEPROM Read

   Reads the value of each byte of the EEPROM and prints it
   to the computer.
   This example code is in the public domain.
*/

#include <EEPROM.h>

// start reading from the first byte (address 0) of the EEPROM
int address = 0;
byte value;

void setup() {
  // initialize serial and wait for port to open:
  Serial.begin(115200);
  EEPROM.begin(512);
}

void loop() {
  // read a byte from the current address of the EEPROM
  value = EEPROM.read(address);

  Serial.print(address);
  Serial.print("\t");
  Serial.print(value, DEC);
  Serial.println();

  // advance to the next address of the EEPROM
  address = address + 1;

  // there are only 512 bytes of EEPROM, from 0 to 511, so if we're
  // on address 512, wrap around to address 0
  if (address == 512) { address = 0; }

  delay(500);
}