framework-arduinoteensy-cxx20/libraries/EEPROM/examples/eeprom_clear/eeprom_clear.ino

/*
 * EEPROM Clear
 *
 * Sets all of the bytes of the EEPROM to 0.
 * Please see eeprom_iteration for a more in depth
 * look at how to traverse the EEPROM.
 *
 * This example code is in the public domain.
 */

#include <EEPROM.h>

void setup()
{

  /***
    Iterate through each byte of the EEPROM storage.

    Larger AVR processors have larger EEPROM sizes, E.g:
    - Arduno Duemilanove: 512b EEPROM storage.
    - Arduino Uno:        1kb EEPROM storage.
    - Arduino Mega:       4kb EEPROM storage.
    - Teensy 3.0 & 3.1:   2kb EEPROM storage.
    - Teensy-LC:          128b EEPROM storage.
    - Teensy 2.0:         1kb EEPROM storage.
    - Teensy++ 2.0:       4kb 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.
  ***/

  for ( unsigned int i = 0 ; i < EEPROM.length() ; i++ )
    EEPROM.write(i, 0);

  // turn the LED on when we're done
  digitalWrite(13, HIGH);
}

void loop(){ /** Empty loop. **/ }