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- /**
- * Marlin 3D Printer Firmware
- *
- * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- * Copyright (c) 2016 Bob Cousins bobcousins42@googlemail.com
- * Copyright (c) 2015-2016 Nico Tonnhofer wurstnase.reprap@gmail.com
- * Copyright (c) 2016 Victor Perez victor_pv@hotmail.com
- *
- * 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/>.
- *
- */
-
- #if defined(STM32GENERIC) && (defined(STM32F4) || defined(STM32F7))
-
- #include "../../inc/MarlinConfigPre.h"
-
- #if ENABLED(EEPROM_SETTINGS)
-
- #include "../shared/persistent_store_api.h"
-
- bool PersistentStore::access_start() { return true; }
- bool PersistentStore::access_finish() { return true; }
-
- bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
- while (size--) {
- uint8_t * const p = (uint8_t * const)pos;
- uint8_t v = *value;
- // EEPROM has only ~100,000 write cycles,
- // so only write bytes that have changed!
- if (v != eeprom_read_byte(p)) {
- eeprom_write_byte(p, v);
- if (eeprom_read_byte(p) != v) {
- SERIAL_ECHO_MSG(STR_ERR_EEPROM_WRITE);
- return true;
- }
- }
- crc16(crc, &v, 1);
- pos++;
- value++;
- };
- return false;
- }
-
- bool PersistentStore::read_data(int &pos, uint8_t* value, size_t size, uint16_t *crc, const bool writing/*=true*/) {
- do {
- uint8_t c = eeprom_read_byte((uint8_t*)pos);
- if (writing) *value = c;
- crc16(crc, &c, 1);
- pos++;
- value++;
- } while (--size);
- return false;
- }
-
- size_t PersistentStore::capacity() { return E2END + 1; }
-
- #endif // EEPROM_SETTINGS
- #endif // STM32GENERIC && (STM32F4 || STM32F7)
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