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EEPROM.cpp
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125 lines (101 loc) · 2.7 KB
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/*
EEPROM.cpp - esp8266 EEPROM emulation
Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
This file is part of the esp8266 core for Arduino environment.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "Arduino.h"
#include "EEPROM.h"
extern "C" {
#include "c_types.h"
#include "ets_sys.h"
#include "os_type.h"
#include "osapi.h"
#include "spi_flash.h"
}
EEPROMClass::EEPROMClass(uint32_t sector)
: _sector(sector)
, _data(0)
, _size(0)
, _dirty(false)
{
}
void EEPROMClass::begin(size_t size) {
if (size <= 0)
return;
if (size > SPI_FLASH_SEC_SIZE)
size = SPI_FLASH_SEC_SIZE;
size = (size + 3) & (~3);
if (_data) {
delete[] _data;
}
_data = new uint8_t[size];
_size = size;
noInterrupts();
spi_flash_read(_sector * SPI_FLASH_SEC_SIZE, reinterpret_cast<uint32_t*>(_data), _size);
interrupts();
}
void EEPROMClass::end() {
if (!_size)
return;
commit();
if(_data) {
delete[] _data;
}
_data = 0;
_size = 0;
}
uint8_t EEPROMClass::read(int address) {
if (address < 0 || (size_t)address >= _size)
return 0;
if(!_data)
return 0;
return _data[address];
}
void EEPROMClass::write(int address, uint8_t value) {
if (address < 0 || (size_t)address >= _size)
return;
if(!_data)
return;
// Optimise _dirty. Only flagged if data written is different.
uint8_t* pData = &_data[address];
if (*pData != value)
{
*pData = value;
_dirty = true;
}
}
bool EEPROMClass::commit() {
bool ret = false;
if (!_size)
return false;
if(!_dirty)
return true;
if(!_data)
return false;
noInterrupts();
if(spi_flash_erase_sector(_sector) == SPI_FLASH_RESULT_OK) {
if(spi_flash_write(_sector * SPI_FLASH_SEC_SIZE, reinterpret_cast<uint32_t*>(_data), _size) == SPI_FLASH_RESULT_OK) {
_dirty = false;
ret = true;
}
}
interrupts();
return ret;
}
uint8_t * EEPROMClass::getDataPtr() {
_dirty = true;
return &_data[0];
}
extern "C" uint32_t _SPIFFS_end;
EEPROMClass EEPROM((((uint32_t)&_SPIFFS_end - 0x40200000) / SPI_FLASH_SEC_SIZE));