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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- *
- * 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 <http://www.gnu.org/licenses/>.
- *
- */
- #if defined(STM32GENERIC) && (defined(STM32F4) || defined(STM32F7))
-
- #include "../../inc/MarlinConfig.h"
-
- #if ENABLED(FLASH_EEPROM_EMULATION)
-
- #include "../shared/eeprom_api.h"
- #include "eeprom_emul.h"
-
- // FLASH_FLAG_PGSERR (Programming Sequence Error) was renamed to
- // FLASH_FLAG_ERSERR (Erasing Sequence Error) in STM32F4/7
-
- #ifdef STM32F7
- #define FLASH_FLAG_PGSERR FLASH_FLAG_ERSERR
- #else
- //#define FLASH_FLAG_PGSERR FLASH_FLAG_ERSERR
- #endif
-
- void ee_write_byte(uint8_t *pos, unsigned char value) {
- HAL_FLASH_Unlock();
- __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR | FLASH_FLAG_PGSERR);
-
- const unsigned eeprom_address = (unsigned)pos;
- if (EE_WriteVariable(eeprom_address, uint16_t(value)) != EE_OK)
- for (;;) HAL_Delay(1); // Spin forever until watchdog reset
-
- HAL_FLASH_Lock();
- }
-
- uint8_t ee_read_byte(uint8_t *pos) {
- uint16_t data = 0xFF;
- const unsigned eeprom_address = (unsigned)pos;
- (void)EE_ReadVariable(eeprom_address, &data); // Data unchanged on error
- return uint8_t(data);
- }
-
- #ifndef MARLIN_EEPROM_SIZE
- #error "MARLIN_EEPROM_SIZE is required for Flash-based EEPROM."
- #endif
- size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
-
- bool PersistentStore::access_finish() { return true; }
-
- bool PersistentStore::access_start() {
- static bool ee_initialized = false;
- if (!ee_initialized) {
- HAL_FLASH_Unlock();
-
- __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR | FLASH_FLAG_PGSERR);
-
- /* EEPROM Init */
- if (EE_Initialize() != EE_OK)
- for (;;) HAL_Delay(1); // Spin forever until watchdog reset
-
- HAL_FLASH_Lock();
- ee_initialized = true;
- }
- return true;
- }
-
- bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
- while (size--) {
- uint8_t * const p = (uint8_t * const)pos;
- uint8_t v = *value;
- // EEPROM has only ~100,000 write cycles,
- // so only write bytes that have changed!
- if (v != ee_read_byte(p)) {
- ee_write_byte(p, v);
- if (ee_read_byte(p) != v) {
- SERIAL_ECHO_MSG(STR_ERR_EEPROM_WRITE);
- return true;
- }
- }
- crc16(crc, &v, 1);
- pos++;
- value++;
- };
- return false;
- }
-
- bool PersistentStore::read_data(int &pos, uint8_t* value, size_t size, uint16_t *crc, const bool writing/*=true*/) {
- do {
- uint8_t c = ee_read_byte((uint8_t*)pos);
- if (writing) *value = c;
- crc16(crc, &c, 1);
- pos++;
- value++;
- } while (--size);
- return false;
- }
-
- #endif // FLASH_EEPROM_EMULATION
- #endif // STM32GENERIC && (STM32F4 || STM32F7)
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