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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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