#include <stdint.h>
#include <avr/io.h>
#include <avr/interrupt.h>

uint8_t eepromRead(uint8_t address) {
    // wait for previous write
    while (EECR & (1 << EEPE));

    //read from address
    EEAR = address;
    return EECR |= (1 << EERE);
}

void eepromWrite(uint8_t address, uint8_t data) {
    // wait for previous write
    while (EECR & (1 << EEPE));

     if (eepromRead(address) != data) {
        EEAR = address;
        EEDR = data;

        EECR |= (1 << EEMPE);
        EECR |= (1 << EEPE);
    }
}

void eepromFlush(uint8_t address)  {
    if (eepromRead(address) != 0) {
        EEAR = address;
        EEDR = 0;

        EECR |= (1 << EEMPE);
        EECR |= (1 << EEPE);
    }
}