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+/**
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+ * Marlin 3D Printer Firmware
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+ * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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+ *
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+ * Based on Sprinter and grbl.
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+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ *
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+ */
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+
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+#ifdef ARDUINO_ARCH_ESP32
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+
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+#include "../../inc/MarlinConfig.h"
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+
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+#if ENABLED(EEPROM_SETTINGS) && DISABLED(FLASH_EEPROM_EMULATION)
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+
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+#include "../shared/persistent_store_api.h"
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+
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+#include "SPIFFS.h"
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+#include "FS.h"
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+#include "spiffs.h"
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+
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+#define HAL_ESP32_EEPROM_SIZE 4096
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+
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+File eeprom_file;
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+
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+bool PersistentStore::access_start() {
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+ if (spiffs_initialized) {
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+ eeprom_file = SPIFFS.open("/eeprom.dat", "r+");
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+
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+ size_t file_size = eeprom_file.size();
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+ if (file_size < HAL_ESP32_EEPROM_SIZE) {
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+ bool write_ok = eeprom_file.seek(file_size);
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+
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+ while (write_ok && file_size < HAL_ESP32_EEPROM_SIZE) {
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+ write_ok = eeprom_file.write(0xFF) == 1;
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+ file_size++;
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+ }
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+ }
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+ return true;
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+ }
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+ return false;
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+}
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+
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+bool PersistentStore::access_finish() {
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+ eeprom_file.close();
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+ return true;
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+}
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+
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+bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
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+ if (!eeprom_file.seek(pos)) return true; // return true for any error
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+ if (eeprom_file.write(value, size) != size) return true;
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+
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+ crc16(crc, value, size);
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+ pos += size;
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+
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+ return false;
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+}
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+
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+bool PersistentStore::read_data(int &pos, uint8_t* value, size_t size, uint16_t *crc, const bool writing/*=true*/) {
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+ if (!eeprom_file.seek(pos)) return true; // return true for any error
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+
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+ if (writing) {
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+ if (eeprom_file.read(value, size) != size) return true;
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+ crc16(crc, value, size);
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+ }
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+ else {
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+ uint8_t tmp[size];
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+ if (eeprom_file.read(tmp, size) != size) return true;
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+ crc16(crc, tmp, size);
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+ }
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+
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+ pos += size;
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+
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+ return false;
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+}
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+
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+size_t PersistentStore::capacity() { return HAL_ESP32_EEPROM_SIZE; }
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+
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+#endif // EEPROM_SETTINGS
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+#endif // ARDUINO_ARCH_ESP32
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