68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/**
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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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#ifdef __AVR__
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#include "../../inc/MarlinConfig.h"
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#if EITHER(EEPROM_SETTINGS, SD_FIRMWARE_UPDATE)
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#include "../shared/persistent_store_api.h"
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bool PersistentStore::access_start() { return true; }
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bool PersistentStore::access_finish() { return true; }
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bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
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while (size--) {
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uint8_t * const p = (uint8_t * const)pos;
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uint8_t v = *value;
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// EEPROM has only ~100,000 write cycles,
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// so only write bytes that have changed!
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if (v != eeprom_read_byte(p)) {
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eeprom_write_byte(p, v);
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if (eeprom_read_byte(p) != v) {
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SERIAL_ECHO_MSG(MSG_ERR_EEPROM_WRITE);
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return true;
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}
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}
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crc16(crc, &v, 1);
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pos++;
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value++;
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};
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return false;
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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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do {
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uint8_t c = eeprom_read_byte((uint8_t*)pos);
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if (writing) *value = c;
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crc16(crc, &c, 1);
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pos++;
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value++;
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} while (--size);
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return false; // always assume success for AVR's
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}
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size_t PersistentStore::capacity() { return E2END + 1; }
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#endif // EEPROM_SETTINGS || SD_FIRMWARE_UPDATE
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#endif // __AVR__
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