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146 lines
3.2 KiB
146 lines
3.2 KiB
/*
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EEPROM.cpp - esp8266 EEPROM emulation
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Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "Arduino.h"
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#include "EEPROM.h"
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extern "C" {
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#include "c_types.h"
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#include "ets_sys.h"
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#include "os_type.h"
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#include "osapi.h"
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#include "spi_flash.h"
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}
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extern "C" uint32_t _SPIFFS_end;
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EEPROMClass::EEPROMClass(uint32_t sector)
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: _sector(sector)
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, _data(0)
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, _size(0)
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, _dirty(false)
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{
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}
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EEPROMClass::EEPROMClass(void)
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: _sector((((uint32_t)&_SPIFFS_end - 0x40200000) / SPI_FLASH_SEC_SIZE))
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, _data(0)
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, _size(0)
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, _dirty(false)
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{
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}
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void EEPROMClass::begin(size_t size) {
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if (size <= 0)
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return;
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if (size > SPI_FLASH_SEC_SIZE)
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size = SPI_FLASH_SEC_SIZE;
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size = (size + 3) & (~3);
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//In case begin() is called a 2nd+ time, don't reallocate if size is the same
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if(_data && size != _size) {
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delete[] _data;
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_data = new uint8_t[size];
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} else if(!_data) {
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_data = new uint8_t[size];
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}
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_size = size;
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noInterrupts();
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spi_flash_read(_sector * SPI_FLASH_SEC_SIZE, reinterpret_cast<uint32_t*>(_data), _size);
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interrupts();
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_dirty = false; //make sure dirty is cleared in case begin() is called 2nd+ time
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}
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void EEPROMClass::end() {
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if (!_size)
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return;
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commit();
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if(_data) {
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delete[] _data;
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}
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_data = 0;
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_size = 0;
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_dirty = false;
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}
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uint8_t EEPROMClass::read(int const address) {
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if (address < 0 || (size_t)address >= _size)
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return 0;
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if(!_data)
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return 0;
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return _data[address];
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}
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void EEPROMClass::write(int const address, uint8_t const value) {
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if (address < 0 || (size_t)address >= _size)
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return;
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if(!_data)
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return;
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// Optimise _dirty. Only flagged if data written is different.
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uint8_t* pData = &_data[address];
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if (*pData != value)
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{
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*pData = value;
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_dirty = true;
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}
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}
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bool EEPROMClass::commit() {
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bool ret = false;
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if (!_size)
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return false;
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if(!_dirty)
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return true;
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if(!_data)
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return false;
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noInterrupts();
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if(spi_flash_erase_sector(_sector) == SPI_FLASH_RESULT_OK) {
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if(spi_flash_write(_sector * SPI_FLASH_SEC_SIZE, reinterpret_cast<uint32_t*>(_data), _size) == SPI_FLASH_RESULT_OK) {
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_dirty = false;
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ret = true;
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}
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}
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interrupts();
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return ret;
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}
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uint8_t * EEPROMClass::getDataPtr() {
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_dirty = true;
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return &_data[0];
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}
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uint8_t const * EEPROMClass::getConstDataPtr() const {
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return &_data[0];
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}
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#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_EEPROM)
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EEPROMClass EEPROM;
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#endif
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