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111 lines
2.5 KiB
C++
111 lines
2.5 KiB
C++
/*
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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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#define CONFIG_START_SECTOR 0x7b
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#define CONFIG_SECTOR (CONFIG_START_SECTOR + 0)
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#define CONFIG_ADDR (SPI_FLASH_SEC_SIZE * CONFIG_SECTOR)
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EEPROMClass::EEPROMClass()
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: _data(0), _size(0), _dirty(false)
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{
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}
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void EEPROMClass::begin(size_t size)
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{
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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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_data = new uint8_t[size];
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_size = size;
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spi_flash_read(CONFIG_ADDR, reinterpret_cast<uint32_t*>(_data), _size);
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}
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void EEPROMClass::end()
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{
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if (!_size)
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return;
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commit();
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delete[] _data;
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_data = 0;
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_size = 0;
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}
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uint8_t EEPROMClass::read(int address)
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{
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if (address < 0 || (size_t)address >= _size)
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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 address, uint8_t value)
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{
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if (address < 0 || (size_t)address >= _size)
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return;
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_data[address] = value;
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_dirty = true;
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}
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bool EEPROMClass::commit()
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{
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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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ETS_UART_INTR_DISABLE();
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if(spi_flash_erase_sector(CONFIG_SECTOR) == SPI_FLASH_RESULT_OK) {
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if(spi_flash_write(CONFIG_ADDR, 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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ETS_UART_INTR_ENABLE();
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return ret;
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}
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uint8_t * EEPROMClass::getDataPtr()
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{
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return &_data[0];
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}
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EEPROMClass EEPROM;
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