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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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