qmk_firmware/platforms/eeprom.h

#pragma once

#if defined(__AVR__) && !defined(EEPROM_DRIVER)
#    include <avr/eeprom.h>
#else
#    include <stdint.h>
#    include <stdlib.h>

uint8_t  eeprom_read_byte(const uint8_t *__p);
uint16_t eeprom_read_word(const uint16_t *__p);
uint32_t eeprom_read_dword(const uint32_t *__p);
void     eeprom_read_block(void *__dst, const void *__src, size_t __n);
void     eeprom_write_byte(uint8_t *__p, uint8_t __value);
void     eeprom_write_word(uint16_t *__p, uint16_t __value);
void     eeprom_write_dword(uint32_t *__p, uint32_t __value);
void     eeprom_write_block(const void *__src, void *__dst, size_t __n);
void     eeprom_update_byte(uint8_t *__p, uint8_t __value);
void     eeprom_update_word(uint16_t *__p, uint16_t __value);
void     eeprom_update_dword(uint32_t *__p, uint32_t __value);
void     eeprom_update_block(const void *__src, void *__dst, size_t __n);
#endif