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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- *
- * Based on Sprinter and grbl.
- * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
- *
- * 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/>.
- *
- */
- #ifdef TARGET_LPC1768
-
- /**
- * Emulate EEPROM storage using Flash Memory
- *
- * Use a single 32K flash sector to store EEPROM data. To reduce the
- * number of erase operations a simple "leveling" scheme is used that
- * maintains a number of EEPROM "slots" within the larger flash sector.
- * Each slot is used in turn and the entire sector is only erased when all
- * slots have been used.
- *
- * A simple RAM image is used to hold the EEPROM data during I/O operations
- * and this is flushed to the next available slot when an update is complete.
- * If RAM usage becomes an issue we could store this image in one of the two
- * 16Kb I/O buffers (intended to hold DMA USB and Ethernet data, but currently
- * unused).
- */
- #include "../../inc/MarlinConfig.h"
-
- #if ENABLED(FLASH_EEPROM_EMULATION)
-
- #include "../shared/eeprom_api.h"
-
- extern "C" {
- #include <lpc17xx_iap.h>
- }
-
- #ifndef MARLIN_EEPROM_SIZE
- #define MARLIN_EEPROM_SIZE 0x1000 // 4KB
- #endif
-
- #define SECTOR_START(sector) ((sector < 16) ? (sector << 12) : ((sector - 14) << 15))
- #define EEPROM_SECTOR 29
- #define SECTOR_SIZE 32768
- #define EEPROM_SLOTS ((SECTOR_SIZE)/(MARLIN_EEPROM_SIZE))
- #define EEPROM_ERASE 0xFF
- #define SLOT_ADDRESS(sector, slot) (((uint8_t *)SECTOR_START(sector)) + slot * (MARLIN_EEPROM_SIZE))
-
- static uint8_t ram_eeprom[MARLIN_EEPROM_SIZE] __attribute__((aligned(4))) = {0};
- static bool eeprom_dirty = false;
- static int current_slot = 0;
-
- size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
-
- bool PersistentStore::access_start() {
- uint32_t first_nblank_loc, first_nblank_val;
- IAP_STATUS_CODE status;
-
- // discover which slot we are currently using.
- __disable_irq();
- status = BlankCheckSector(EEPROM_SECTOR, EEPROM_SECTOR, &first_nblank_loc, &first_nblank_val);
- __enable_irq();
-
- if (status == CMD_SUCCESS) {
- // sector is blank so nothing stored yet
- for (int i = 0; i < MARLIN_EEPROM_SIZE; i++) ram_eeprom[i] = EEPROM_ERASE;
- current_slot = EEPROM_SLOTS;
- }
- else {
- // current slot is the first non blank one
- current_slot = first_nblank_loc / (MARLIN_EEPROM_SIZE);
- uint8_t *eeprom_data = SLOT_ADDRESS(EEPROM_SECTOR, current_slot);
- // load current settings
- for (int i = 0; i < MARLIN_EEPROM_SIZE; i++) ram_eeprom[i] = eeprom_data[i];
- }
- eeprom_dirty = false;
-
- return true;
- }
-
- bool PersistentStore::access_finish() {
- if (eeprom_dirty) {
- IAP_STATUS_CODE status;
- if (--current_slot < 0) {
- // all slots have been used, erase everything and start again
- __disable_irq();
- status = EraseSector(EEPROM_SECTOR, EEPROM_SECTOR);
- __enable_irq();
-
- current_slot = EEPROM_SLOTS - 1;
- }
-
- __disable_irq();
- status = CopyRAM2Flash(SLOT_ADDRESS(EEPROM_SECTOR, current_slot), ram_eeprom, IAP_WRITE_4096);
- __enable_irq();
-
- if (status != CMD_SUCCESS) return false;
- eeprom_dirty = false;
- }
- 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, 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 // TARGET_LPC1768
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