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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 inline 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 inline 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 inline 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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