eeprom_read.ino.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;
int count = 8;
void setup() {
  // initialize serial and wait for port to open:
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }
}

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

  Serial.print("Reading key ");
  Serial.print(address/8, DEC);
  Serial.print(": ");
  while (count>0){
    value = EEPROM.read(address);
    Serial.print(value, HEX);
    address = address + 1;
    //Serial.println(address, DEC);
    count=count-1;
  }
  count=8;
  Serial.print("\t");
  Serial.println();

  /***
    Advance to the next address, when at the end restart at the beginning.

    Larger AVR processors have larger EEPROM sizes, E.g:
    - Arduino Duemilanove: 512 B EEPROM storage.
    - Arduino Uno:         1 kB EEPROM storage.
    - Arduino Mega:        4 kB EEPROM storage.

    Rather than hard-coding the length, you should use the pre-provided length function.
    This will make your code portable to all AVR processors.
  ***/
  if (address == EEPROM.length()) {
    address = 0;
  }

  /***
    As the EEPROM sizes are powers of two, wrapping (preventing overflow) of an
    EEPROM address is also doable by a bitwise and of the length - 1.

    ++address &= EEPROM.length() - 1;
  ***/

  delay(150);
}