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84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2020 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 <https://www.gnu.org/licenses/>.
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*
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*/
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#pragma once
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#include <stddef.h>
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#include <stdint.h>
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#include "../../libs/crc16.h"
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// For testing. Define with -DEEPROM_EXCL_ZONE=919,926 in INI files.
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//#define EEPROM_EXCL_ZONE 919,926 // Test a range
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//#define EEPROM_EXCL_ZONE 333 // Test a single byte
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#ifdef EEPROM_EXCL_ZONE
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static constexpr int eeprom_exclude_zone[] = { EEPROM_EXCL_ZONE },
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eeprom_exclude_size = eeprom_exclude_zone[COUNT(eeprom_exclude_zone) - 1] - eeprom_exclude_zone[0] + 1;
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#define REAL_EEPROM_ADDR(A) (A < eeprom_exclude_zone[0] ? (A) : (A) + eeprom_exclude_size)
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#else
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#define REAL_EEPROM_ADDR(A) (A)
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static constexpr int eeprom_exclude_size = 0;
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#endif
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class PersistentStore {
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public:
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// Total available persistent storage space (in bytes)
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static size_t capacity();
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// Prepare to read or write
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static bool access_start();
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// Housecleaning after read or write
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static bool access_finish();
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// Write one or more bytes of data and update the CRC
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// Return 'true' on write error
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static bool write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc);
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// Read one or more bytes of data and update the CRC
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// Return 'true' on read error
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static bool read_data(int &pos, uint8_t *value, size_t size, uint16_t *crc, const bool writing=true);
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// Write one or more bytes of data
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// Return 'true' on write error
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static bool write_data(const int pos, const uint8_t *value, const size_t size=sizeof(uint8_t)) {
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int data_pos = pos;
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uint16_t crc = 0;
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return write_data(data_pos, value, size, &crc);
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}
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// Write a single byte of data
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// Return 'true' on write error
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static bool write_data(const int pos, const uint8_t value) { return write_data(pos, &value); }
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// Read one or more bytes of data
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// Return 'true' on read error
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static bool read_data(const int pos, uint8_t *value, const size_t size=1) {
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int data_pos = pos;
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uint16_t crc = 0;
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return read_data(data_pos, value, size, &crc);
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}
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};
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extern PersistentStore persistentStore;
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