Firmware2/Marlin/src/HAL/HAL_DUE/persistent_store_eeprom.cpp
2019-09-28 23:52:54 -05:00

83 lines
2.4 KiB
C++

/**
* Marlin 3D Printer Firmware
*
* Copyright (c) 2019 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 <http://www.gnu.org/licenses/>.
*
*/
#ifdef ARDUINO_ARCH_SAM
#include "../../inc/MarlinConfigPre.h"
#if ENABLED(EEPROM_SETTINGS)
#include "../../inc/MarlinConfig.h"
#include "../shared/persistent_store_api.h"
#if !defined(E2END) && NONE(I2C_EEPROM, SPI_EEPROM)
#define E2END 0xFFF // Default to Flash emulated EEPROM size (EepromEmulation_Due.cpp)
#endif
extern void eeprom_flush();
bool PersistentStore::access_start() { return true; }
bool PersistentStore::access_finish() {
#if NONE(I2C_EEPROM, SPI_EEPROM)
eeprom_flush();
#endif
return true;
}
bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
while (size--) {
uint8_t * const p = (uint8_t * const)pos;
uint8_t v = *value;
// EEPROM has only ~100,000 write cycles,
// so only write bytes that have changed!
if (v != eeprom_read_byte(p)) {
eeprom_write_byte(p, v);
delay(2);
if (eeprom_read_byte(p) != v) {
SERIAL_ECHO_MSG(MSG_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;
}
size_t PersistentStore::capacity() { return E2END + 1; }
#endif // EEPROM_SETTINGS
#endif // ARDUINO_ARCH_SAM