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// fsm-eeprom.h: EEPROM API for SpaghettiMonster.
// Copyright (C) 2017-2023 Selene ToyKeeper
// SPDX-License-Identifier: GPL-3.0-or-later
#pragma once
#include <avr/eeprom.h>
// set this higher to enable normal eeprom functions
// TODO: rename to EEPROM_BYTES_NEEDED or similar, to make purpose clearer
#ifndef EEPROM_BYTES
#define EEPROM_BYTES 0
#endif
// set this higher to enable wear-levelled eeprom functions
// TODO: rename to EEPROM_WL_BYTES_NEEDED or similar, to make purpose clearer
#ifndef EEPROM_WL_BYTES
#define EEPROM_WL_BYTES 0
#endif
#ifdef USE_EEPROM
#ifdef USE_EEPROM_WL
// split eeprom in half
#define EEP_START (EEPROM_SIZE/2)
BUILD_ASSERT(eep_less_than_half, EEPROM_BYTES <= (EEPROM_SIZE/2));
#else
// use entire eeprom
#define EEP_START 0
BUILD_ASSERT(eep_data_fits, EEPROM_BYTES <= EEPROM_SIZE);
#endif
#ifdef EEPROM_OVERRIDE
uint8_t *eeprom;
#else
uint8_t eeprom[EEPROM_BYTES];
#endif
uint8_t load_eeprom(); // returns 1 for success, 0 for no data found
void save_eeprom();
#endif
#ifdef USE_EEPROM_WL
#define EEP_WL_SIZE (EEPROM_SIZE/2)
// ensure space for at least 2 slots for wear levelling
BUILD_ASSERT(eepwl_two_slots_minimum, EEPROM_WL_BYTES <= (EEP_WL_SIZE/2));
uint8_t eeprom_wl[EEPROM_WL_BYTES];
uint8_t load_eeprom_wl(); // returns 1 for success, 0 for no data found
void save_eeprom_wl();
#endif
#if EEPROM_SIZE > 256
#define EEP_OFFSET_T uint16_t
#else
#define EEP_OFFSET_T uint8_t
#endif
// if this marker isn't found, the eeprom is assumed to be blank
#define EEP_MARKER 0b10100101
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