113 lines
4 KiB
C++
113 lines
4 KiB
C++
/**
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* Marlin 3D Printer Firmware
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*
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* Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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* Copyright (c) 2016 Bob Cousins bobcousins42@googlemail.com
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* Copyright (c) 2015-2016 Nico Tonnhofer wurstnase.reprap@gmail.com
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* Copyright (c) 2016 Victor Perez victor_pv@hotmail.com
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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 <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* persistent_store_flash.cpp
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* HAL for stm32duino and compatible (STM32F1)
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* Implementation of EEPROM settings in SDCard
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*/
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#ifdef __STM32F1__
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#include "../../inc/MarlinConfig.h"
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// This is for EEPROM emulation in flash
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#if BOTH(EEPROM_SETTINGS, FLASH_EEPROM_EMULATION)
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#include "../shared/persistent_store_api.h"
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#include <flash_stm32.h>
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#include <EEPROM.h>
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// Store settings in the last two pages
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#define EEPROM_SIZE (EEPROM_PAGE_SIZE * 2)
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#define ACCESS_FINISHED(TF) do{ FLASH_Lock(); eeprom_dirty = false; return TF; }while(0)
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static uint8_t ram_eeprom[EEPROM_SIZE] __attribute__((aligned(4))) = {0};
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static bool eeprom_dirty = false;
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bool PersistentStore::access_start() {
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const uint32_t* source = reinterpret_cast<const uint32_t*>(EEPROM_PAGE0_BASE);
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uint32_t* destination = reinterpret_cast<uint32_t*>(ram_eeprom);
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static_assert(0 == EEPROM_SIZE % 4, "EEPROM_SIZE is corrupted. (Must be a multiple of 4.)"); // Ensure copying as uint32_t is safe
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constexpr size_t eeprom_size_u32 = EEPROM_SIZE / 4;
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for (size_t i = 0; i < eeprom_size_u32; ++i, ++destination, ++source)
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*destination = *source;
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eeprom_dirty = false;
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return true;
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}
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bool PersistentStore::access_finish() {
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if (eeprom_dirty) {
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FLASH_Status status;
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// Instead of erasing all (both) pages, maybe in the loop we check what page we are in, and if the
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// data has changed in that page. We then erase the first time we "detect" a change. In theory, if
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// nothing changed in a page, we wouldn't need to erase/write it.
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// Or, instead of checking at this point, turn eeprom_dirty into an array of bool the size of number
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// of pages. Inside write_data, we set the flag to true at that time if something in that
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// page changes...either way, something to look at later.
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FLASH_Unlock();
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status = FLASH_ErasePage(EEPROM_PAGE0_BASE);
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if (status != FLASH_COMPLETE) ACCESS_FINISHED(true);
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status = FLASH_ErasePage(EEPROM_PAGE1_BASE);
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if (status != FLASH_COMPLETE) ACCESS_FINISHED(true);
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const uint16_t *source = reinterpret_cast<const uint16_t*>(ram_eeprom);
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for (size_t i = 0; i < EEPROM_SIZE; i += 2, ++source) {
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if (FLASH_ProgramHalfWord(EEPROM_PAGE0_BASE + i, *source) != FLASH_COMPLETE)
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ACCESS_FINISHED(false);
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}
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ACCESS_FINISHED(true);
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}
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return true;
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}
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bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
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for (size_t i = 0; i < size; ++i) ram_eeprom[pos + i] = value[i];
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eeprom_dirty = true;
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crc16(crc, value, size);
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pos += size;
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return false; // return true for any error
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}
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bool PersistentStore::read_data(int &pos, uint8_t* value, const size_t size, uint16_t *crc, const bool writing/*=true*/) {
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const uint8_t * const buff = writing ? &value[0] : &ram_eeprom[pos];
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if (writing) for (size_t i = 0; i < size; i++) value[i] = ram_eeprom[pos + i];
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crc16(crc, buff, size);
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pos += size;
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return false; // return true for any error
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}
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size_t PersistentStore::capacity() { return EEPROM_SIZE; }
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#endif // EEPROM_SETTINGS && EEPROM FLASH
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#endif // __STM32F1__
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