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/*
* fsm-eeprom.c: EEPROM API for SpaghettiMonster.
*
* Copyright (C) 2017 Selene Scriven
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef FSM_EEPROM_C
#define FSM_EEPROM_C
#include "fsm-eeprom.h"
#ifdef USE_EEPROM
#ifdef EEPROM_OVERRIDE
uint8_t *eeprom;
#else
uint8_t eeprom[EEPROM_BYTES];
#endif
uint8_t load_eeprom() {
#ifdef LED_ENABLE_PIN
delay_4ms(2); // wait for power to stabilize
#endif
cli();
// check if eeprom has been initialized; abort if it hasn't
uint8_t marker = eeprom_read_byte((uint8_t *)EEP_START);
if (marker != EEP_MARKER) { sei(); return 0; }
// load the actual data
for(uint8_t i=0; i<EEPROM_BYTES; i++) {
eeprom[i] = eeprom_read_byte((uint8_t *)(EEP_START+1+i));
}
sei();
return 1;
}
void save_eeprom() {
#ifdef LED_ENABLE_PIN
delay_4ms(2); // wait for power to stabilize
#endif
cli();
// save the actual data
for(uint8_t i=0; i<EEPROM_BYTES; i++) {
eeprom_update_byte((uint8_t *)(EEP_START+1+i), eeprom[i]);
}
// save the marker last, to indicate the transaction is complete
eeprom_update_byte((uint8_t *)EEP_START, EEP_MARKER);
sei();
}
#endif
#ifdef USE_EEPROM_WL
uint8_t eeprom_wl[EEPROM_WL_BYTES];
uint8_t * eep_wl_prev_offset;
uint8_t load_eeprom_wl() {
#ifdef LED_ENABLE_PIN
delay_4ms(2); // wait for power to stabilize
#endif
cli();
// check if eeprom has been initialized; abort if it hasn't
uint8_t found = 0;
uint8_t * offset;
for(offset = 0;
offset < (uint8_t *)(EEP_WL_SIZE - EEPROM_WL_BYTES - 1);
offset += (EEPROM_WL_BYTES + 1)) {
if (eeprom_read_byte(offset) == EEP_MARKER) {
found = 1;
eep_wl_prev_offset = offset;
break;
}
}
if (found) {
// load the actual data
for(uint8_t i=0; i<EEPROM_WL_BYTES; i++) {
eeprom_wl[i] = eeprom_read_byte(offset+1+i);
}
}
sei();
return found;
}
void save_eeprom_wl() {
#ifdef LED_ENABLE_PIN
delay_4ms(2); // wait for power to stabilize
#endif
cli();
// erase old state
uint8_t * offset = eep_wl_prev_offset;
for (uint8_t i = 0; i < EEPROM_WL_BYTES+1; i ++) {
eeprom_update_byte(offset+i, 0xFF);
}
// save new state
offset += EEPROM_WL_BYTES+1;
if (offset > (uint8_t *)(EEP_WL_SIZE-EEPROM_WL_BYTES-1)) offset = 0;
eep_wl_prev_offset = offset;
// marker byte
// FIXME: write the marker last, to signal completed transaction
eeprom_update_byte(offset, EEP_MARKER);
offset ++;
// user data
for(uint8_t i=0; i<EEPROM_WL_BYTES; i++, offset++) {
eeprom_update_byte(offset, eeprom_wl[i]);
}
sei();
}
#endif
#endif
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