EEPROM.cpp

/*
  EEPROM.h -ported by Paolo Becchi to Esp32 from esp8266 EEPROM
           -Modified by Elochukwu Ifediora <ifedioraelochukwuc@gmail.com>

  Uses a one sector flash partition defined in partition table
  OR
  Multiple sector flash partitions defined by the name column in the partition table

  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"

#include <esp_log.h>

static const char* TAG = "eeprom";

EEPROMClass::EEPROMClass(uint32_t sector)
  : _sector(sector)
  , _data(0)
  , _size(0)
  , _dirty(false)
  , _name("eeprom")
{
}

EEPROMClass::EEPROMClass(const char* name, uint32_t user_defined_size)
  : _sector(0)
  , _data(0)
  , _size(0)
  , _dirty(false)
  , _name(name)
  , _user_defined_size(user_defined_size)
{
}

EEPROMClass::EEPROMClass(void)
  : _sector(0)// (((uint32_t)&_SPIFFS_end - 0x40200000) / SPI_FLASH_SEC_SIZE))
  , _data(0)
  , _size(0)
  , _dirty(false)
  , _name("eeprom")
{
}

EEPROMClass::~EEPROMClass() {
  // end();
}

bool EEPROMClass::begin(size_t size) {
  if (size <= 0) {
    return false;
  }
  if (size > SPI_FLASH_SEC_SIZE) {
    size = SPI_FLASH_SEC_SIZE;
  }
  //  _mypart = esp_partition_find_first(ESP_PARTITION_TYPE_DATA,ESP_PARTITION_SUBTYPE_ANY, EEPROM_FLASH_PARTITION_NAME);
  _mypart = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, _name);
  if (_mypart == NULL) {
    return false;
  }
  size = (size + 3) & (~3);

  if (_data) {
    delete[] _data;
  }

  _data = new uint8_t[size];
  _size = size;
  bool ret = false;
  if (esp_partition_read (_mypart, 0, (void *) _data, _size) == ESP_OK) {
    ret = true;
  }

  return ret;
}

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;


  if (esp_partition_erase_range(_mypart, 0, SPI_FLASH_SEC_SIZE) != ESP_OK)
  {
    log_e( "partition erase err.");
  }
  else
  {
    if (esp_partition_write(_mypart, 0, (void *)_data, _size) == ESP_ERR_INVALID_SIZE)
    {
      log_e( "error in Write");
    }
    else
    {
      _dirty = false;
      ret = true;
    }
  }

  return ret;
}

uint8_t * EEPROMClass::getDataPtr() {
  _dirty = true;
  return &_data[0];
}

/*
   Get EEPROM total size in byte defined by the user
*/
uint16_t EEPROMClass::length ()
{
  return _user_defined_size;
}

/*
   Read 'value' from 'address'
*/
uint8_t EEPROMClass::readByte (int address)
{
  uint8_t value;
  return EEPROMClass::readAll (address, value);
}

int8_t EEPROMClass::readChar (int address)
{
  int8_t value;
  return EEPROMClass::readAll (address, value);
}

uint8_t EEPROMClass::readUChar (int address)
{
  uint8_t value;
  return EEPROMClass::readAll (address, value);
}

int16_t EEPROMClass::readShort (int address)
{
  int16_t value;
  return EEPROMClass::readAll (address, value);
}

uint16_t EEPROMClass::readUShort (int address)
{
  uint16_t value;
  return EEPROMClass::readAll (address, value);
}

int32_t EEPROMClass::readInt (int address)
{
  int32_t value;
  return EEPROMClass::readAll (address, value);
}

uint32_t EEPROMClass::readUInt (int address)
{
  uint32_t value;
  return EEPROMClass::readAll (address, value);
}

int32_t EEPROMClass::readLong (int address)
{
  int32_t value;
  return EEPROMClass::readAll (address, value);
}

uint32_t EEPROMClass::readULong (int address)
{
  uint32_t value;
  return EEPROMClass::readAll (address, value);
}

int64_t EEPROMClass::readLong64 (int address)
{
  int64_t value;
  return EEPROMClass::readAll (address, value);
}

uint64_t EEPROMClass::readULong64 (int address)
{
  uint64_t value;
  return EEPROMClass::readAll (address, value);
}

float_t EEPROMClass::readFloat (int address)
{
  float_t value;
  return EEPROMClass::readAll (address, value);
}

double_t EEPROMClass::readDouble (int address)
{
  double_t value;
  return EEPROMClass::readAll (address, value);
}

bool EEPROMClass::readBool (int address)
{
  int8_t value;
  return EEPROMClass::readAll (address, value) ? 1 : 0;
}

size_t EEPROMClass::readString (int address, char* value, size_t maxLen)
{
  if (!value)
    return 0;

  if (address < 0 || address + maxLen > _size)
    return 0;

  uint16_t len;
  for (len = 0; len <= _size; len++)
    if (_data[address + len] == 0)
      break;

  if (address + len > _size)
    return 0;

  memcpy((uint8_t*) value, _data + address, len);
  return len;
}

String EEPROMClass::readString (int address)
{
  if (address < 0 || address > _size)
    return String(0);

  uint16_t len;
  for (len = 0; len <= _size; len++)
    if (_data[address + len] == 0)
      break;

  if (address + len > _size)
    return String(0);

  char value[len + 1];
  memcpy((uint8_t*) value, _data + address, len);
  value[len + 1] = 0;
  return String(value);
}

size_t EEPROMClass::readBytes (int address, void* value, size_t maxLen)
{
  if (!value || !maxLen)
    return 0;

  if (address < 0 || address + maxLen > _size)
    return 0;

  memcpy((void*) value, _data + address, maxLen);
  return maxLen;
}

template <class T> T EEPROMClass::readAll (int address, T &value)
{
  if (address < 0 || address + sizeof(T) > _size)
    return value;

  memcpy((uint8_t*) &value, _data + address, sizeof(T));
  return value;
}

/*
   Write 'value' to 'address'
*/
size_t EEPROMClass::writeByte (int address, uint8_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeChar (int address, int8_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeUChar (int address, uint8_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeShort (int address, int16_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeUShort (int address, uint16_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeInt (int address, int32_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeUInt (int address, uint32_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeLong (int address, int32_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeULong (int address, uint32_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeLong64 (int address, int64_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeULong64 (int address, uint64_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeFloat (int address, float_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeDouble (int address, double_t value)
{
  return EEPROMClass::writeAll (address, value);
}

size_t EEPROMClass::writeBool (int address, bool value)
{
  int8_t Bool;
  value ? Bool = 1 : Bool = 0;
  return EEPROMClass::writeAll (address, Bool);
}

size_t EEPROMClass::writeString (int address, const char* value)
{
  if (!value)
    return 0;

  if (address < 0 || address > _size)
    return 0;

  uint16_t len;
  for (len = 0; len <= _size; len++)
    if (value[len] == 0)
      break;

  if (address + len > _size)
    return 0;

  memcpy(_data + address, (const uint8_t*) value, len + 1);
  _dirty = true;
  return strlen(value);
}

size_t EEPROMClass::writeString (int address, String value)
{
  return EEPROMClass::writeString (address, value.c_str());
}

size_t EEPROMClass::writeBytes (int address, const void* value, size_t len)
{
  if (!value || !len)
    return 0;

  if (address < 0 || address + len > _size)
    return 0;

  memcpy(_data + address, (const void*) value, len);
  _dirty = true;
  return len;
}

template <class T> T EEPROMClass::writeAll (int address, const T &value)
{
  if (address < 0 || address + sizeof(T) > _size)
    return value;

  memcpy(_data + address, (const uint8_t*) &value, sizeof(T));
  _dirty = true;

  return sizeof (value);
}

#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_EEPROM)
EEPROMClass EEPROM;
#endif