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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 <https://www.gnu.org/licenses/>.
- *
- */
- #pragma once
-
- #include <stddef.h>
- #include <stdint.h>
-
- #include "../../libs/crc16.h"
-
- class PersistentStore {
- public:
-
- // Total available persistent storage space (in bytes)
- static size_t capacity();
-
- // Prepare to read or write
- static bool access_start();
-
- // Housecleaning after read or write
- static bool access_finish();
-
- // Write one or more bytes of data and update the CRC
- // Return 'true' on write error
- static bool write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc);
-
- // Read one or more bytes of data and update the CRC
- // Return 'true' on read error
- static bool read_data(int &pos, uint8_t *value, size_t size, uint16_t *crc, const bool writing=true);
-
- // Write one or more bytes of data
- // Return 'true' on write error
- static bool write_data(const int pos, const uint8_t *value, const size_t size=sizeof(uint8_t)) {
- int data_pos = pos;
- uint16_t crc = 0;
- return write_data(data_pos, value, size, &crc);
- }
-
- // Write a single byte of data
- // Return 'true' on write error
- static bool write_data(const int pos, const uint8_t value) { return write_data(pos, &value); }
-
- // Read one or more bytes of data
- // Return 'true' on read error
- static bool read_data(const int pos, uint8_t *value, const size_t size=1) {
- int data_pos = pos;
- uint16_t crc = 0;
- return read_data(data_pos, value, size, &crc);
- }
- };
-
- extern PersistentStore persistentStore;
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