/** * Marlin 3D Printer Firmware * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin] * * Based on Sprinter and grbl. * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm * * 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 . * */ #ifdef __AVR__ #include "../../inc/MarlinConfig.h" #if EITHER(EEPROM_SETTINGS, SD_FIRMWARE_UPDATE) /** * PersistentStore for Arduino-style EEPROM interface * with implementations supplied by the framework. */ #include "../shared/eeprom_api.h" #ifndef MARLIN_EEPROM_SIZE #define MARLIN_EEPROM_SIZE size_t(E2END + 1) #endif size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; } 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) { uint16_t written = 0; while (size--) { uint8_t * const p = (uint8_t * const)pos; uint8_t v = *value; if (v != eeprom_read_byte(p)) { // EEPROM has only ~100,000 write cycles, so only write bytes that have changed! eeprom_write_byte(p, v); if (++written & 0x7F) delay(2); else safe_delay(2); // Avoid triggering watchdog during long EEPROM writes 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; // always assume success for AVR's } #endif // EEPROM_SETTINGS || SD_FIRMWARE_UPDATE #endif // __AVR__