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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/>.
- *
- */
-
- /**
- * persistent_store_flash.cpp
- * HAL for stm32duino and compatible (STM32F1)
- * Implementation of EEPROM settings in SDCard
- */
-
- #ifdef __STM32F1__
-
- #include "../../inc/MarlinConfig.h"
-
- #if ENABLED(FLASH_EEPROM_EMULATION)
-
- #include "../shared/eeprom_api.h"
-
- #include <flash_stm32.h>
- #include <EEPROM.h>
-
- // Store settings in the last two pages
- #ifndef MARLIN_EEPROM_SIZE
- #define MARLIN_EEPROM_SIZE ((EEPROM_PAGE_SIZE) * 2)
- #endif
- size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
-
- static uint8_t ram_eeprom[MARLIN_EEPROM_SIZE] __attribute__((aligned(4))) = {0};
- static bool eeprom_dirty = false;
-
- bool PersistentStore::access_start() {
- const uint32_t *source = reinterpret_cast<const uint32_t*>(EEPROM_PAGE0_BASE);
- uint32_t *destination = reinterpret_cast<uint32_t*>(ram_eeprom);
-
- static_assert(0 == (MARLIN_EEPROM_SIZE) % 4, "MARLIN_EEPROM_SIZE is corrupted. (Must be a multiple of 4.)"); // Ensure copying as uint32_t is safe
- constexpr size_t eeprom_size_u32 = (MARLIN_EEPROM_SIZE) / 4;
-
- for (size_t i = 0; i < eeprom_size_u32; ++i, ++destination, ++source)
- *destination = *source;
-
- eeprom_dirty = false;
- return true;
- }
-
- bool PersistentStore::access_finish() {
-
- if (eeprom_dirty) {
- FLASH_Status status;
-
- // Instead of erasing all (both) pages, maybe in the loop we check what page we are in, and if the
- // data has changed in that page. We then erase the first time we "detect" a change. In theory, if
- // nothing changed in a page, we wouldn't need to erase/write it.
- // Or, instead of checking at this point, turn eeprom_dirty into an array of bool the size of number
- // of pages. Inside write_data, we set the flag to true at that time if something in that
- // page changes...either way, something to look at later.
- FLASH_Unlock();
-
- #define ACCESS_FINISHED(TF) { FLASH_Lock(); eeprom_dirty = false; return TF; }
-
- status = FLASH_ErasePage(EEPROM_PAGE0_BASE);
- if (status != FLASH_COMPLETE) ACCESS_FINISHED(true);
- status = FLASH_ErasePage(EEPROM_PAGE1_BASE);
- if (status != FLASH_COMPLETE) ACCESS_FINISHED(true);
-
- const uint16_t *source = reinterpret_cast<const uint16_t*>(ram_eeprom);
- for (size_t i = 0; i < MARLIN_EEPROM_SIZE; i += 2, ++source) {
- if (FLASH_ProgramHalfWord(EEPROM_PAGE0_BASE + i, *source) != FLASH_COMPLETE)
- ACCESS_FINISHED(false);
- }
-
- ACCESS_FINISHED(true);
- }
-
- return true;
- }
-
- bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
- for (size_t i = 0; i < size; ++i) ram_eeprom[pos + i] = value[i];
- eeprom_dirty = true;
- crc16(crc, value, size);
- pos += size;
- return false; // return true for any error
- }
-
- bool PersistentStore::read_data(int &pos, uint8_t *value, const size_t size, uint16_t *crc, const bool writing/*=true*/) {
- const uint8_t * const buff = writing ? &value[0] : &ram_eeprom[pos];
- if (writing) for (size_t i = 0; i < size; i++) value[i] = ram_eeprom[pos + i];
- crc16(crc, buff, size);
- pos += size;
- return false; // return true for any error
- }
-
- #endif // FLASH_EEPROM_EMULATION
- #endif // __STM32F1__
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