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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
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# ESPFlash
An abstraction layer that simplifies the storing of vectorised data in the filesystem on the ESP8266 and ESP32.
ESPFlash is a lightweight library that was created to make SPIFFS usage simple and easy to understand on the ESP8266 and ESP32.
## Features
- Simple template based interface to store and retrieve generic vectorised data in flash memory using SPIFFS with ESPFlash.
- Implementation of simple SPIFFS based integer counter with ESPFlashCounter.
- Implementation of simple SPIFFS based string storer using ESPFlashString.
## Why Would I Want This?
- ESPFlash enables the storage of generic data in a persistant matter. This is data that will exist through multiple power cycles or software resets.
- ESPFlash takes care of a lot of the nastiness that exists when using SPIFFS using the concept of vectorised data. This includes the following functionailty:
- Automatically starts SPIFFS if it has not already been started.
- Automatically truncates filenames that are over 32 characters in length.
- Calculates the number of generic "elements" stored in a file.
- Overwrites elements.
- Appends elements.
- Gets elements.
- Clears elements.
## One Thing to Keep In Mind
SPIFFS is not particularly fast. It is not designed to be used in a manner that requires high-throughput data input/output. ESPFlash does not significantly increase the performance issues of SPIFFS, but you should consider if SPIFFS usage is suitable for your application.
## Installation
Download this file as a zip, and extract the resulting folder into your Arduino Libraries folder. See [Installing Additional Arduino Libraries](https://www.arduino.cc/en/Guide/Libraries). Alternatively, use the Arduino IDE and library manager to find and install ESPFlash.
## Examples
The blog post [ESPFlash: An Arduino Library for Storing Data in the ESP Filesystem](https://dalegi.com/2020/04/22/espflash-an-arduino-library-for-storing-data-in-the-esp-filesystem/) contains some useful comparisons between ESPFlash usage and SPIFFS usage. In addition, here are some basic ESPFlash example:
- Simple ESPFlash integer example - Create ESPFlash instance with file name of "exampleInteger". Set a single elements value, and get it back.
```c++
SPIFFS.begin()
ESPFlash<int> espFlashInteger("/exampleInteger");
espFlashInteger.set(10);
int testInteger = espFlashInteger.get();
```
- Simple ESPFlash vector example - Create ESPFlash instance with file name of "exampleInteger". Append 10 randomly generated elements. Get the elements back.
```c++
SPIFFS.begin()
ESPFlash<int> espFlashInteger("/exampleArray");
for(int ii = 0; ii < 10; ii++)
{
espFlashInteger.append(random(100));
}
int testGet[10];
espFlashInteger.getFrontElements(testGet, sizeof(testGet));
```
- Simple ESPFlash vector example - Create ESPFlash instance with file name of "exampleInteger". Append 50 randomly generated elements. Get the last 10 elements back.
```c++
SPIFFS.begin()
ESPFlash<int> espFlashInteger("/exampleArray");
for(int ii = 0; ii < 50; ii++)
{
espFlashInteger.append(random(100));
}
int testGet[10];
espFlashInteger.getBackElements(testGet, sizeof(testGet));
```
- Simple ESPFlashCounter example - Create ESPFlashCounter instance with file name of "exampleCounter". Increment the counter. Get the Counter
```c++
SPIFFS.begin()
ESPFlashCounter exampleCounter("/exampleCounter");
exampleCounter.increment();
int testGet = exampleCounter.get();
```
- Simple ESPFlashString example - Create ESPFlashString instance with file name of "exampleString". Set a string. Get the string.
```c++
SPIFFS.begin()
ESPFlashCounter exampleString("/exampleString");
exampleString.set("Hello!");
String string = exampleString.get();
```
## Further Examples
[millisArray.ino](examples/millisArray/millisArray.ino)
[powerCycleCounter.ino](examples/powerCycleCounter/powerCycleCounter.ino)
[ssidStorage.ino](examples/ssidStorage/ssidStorage.ino)

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/*
millisArray.ino
Copyright (c) 2020 Dale Giancono. All rights reserved..
This file is a an application to demonstrte the abilities of the
ESPFlash Library. It uses an ESPFlash<uint32_t> instance to store
10 millis values in an array.
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 <https://www.gnu.org/licenses/>.
*/
#include "ESPFlash.h"
#define ARRAY_FILEPATH "/millisArray"
ESPFlash<uint32_t> millisArray(ARRAY_FILEPATH);
void setup()
{
Serial.begin(115200);
Serial.println("Begining millisArray example...");
/* Have to initialise before performing any SPIFFS operations*/
SPIFFS.begin();
for(int ii = 0; ii < 10; ii++)
{
millisArray.append(millis());
for(int jj = 0; jj < millisArray.length(); jj++)
{
Serial.printf("%d ", millisArray.getElementAt(jj));
}
Serial.println();
}
Serial.println("Example finished...");
}
void loop()
{
}

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/*
powerCycleCounter.ino
Copyright (c) 2020 Dale Giancono. All rights reserved..
This file is a an application to demonstrte the abilities of the
ESPFlash Library. It uses an ESPFlashCounter instance to count
the number of times the ESP chip has had a power cycle/software reset.
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 <https://www.gnu.org/licenses/>.
*/
#include "ESPFlashCounter.h"
void setup()
{
Serial.begin(115200);
Serial.println("Starting");
/* Have to initialise before performing any SPIFFS operations*/
SPIFFS.begin();
ESPFlashCounter flashCounter("/counter");
flashCounter.increment();
Serial.print("Power Cycle ESPFlashCounter: ");
Serial.print(flashCounter.get());
Serial.println();
delay(3000);
ESP.reset();
}
void loop()
{
}

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/*
ssidStorage.ino
Copyright (c) 2020 Dale Giancono. All rights reserved..
This file is a an application to demonstrte the abilities of the
ESPFlash Library. It uses an ESPFlashString instance to store
the value of an SSID. An AsyncWebServer provides a way to change the
ssid value with a browser.
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 <https://www.gnu.org/licenses/>.
*/
#include "ESP8266WiFi.h"
#include "ESPAsyncTCP.h"
#include <ESPAsyncWebServer.h>
#include "ESPFlashString.h"
#define DEFAULT_SSID "ESPFlashString Test"
#define SSID_FILEPATH "/ssid"
static const char _SSIDEDIT[] = "<html><body><form action=\"/ssidedit\">New SSID: <input type=\"text\" value=\"\" name=\"SSID\"><input type=\"submit\" name=\"submit\"></form></html></body>";
/* Create webserver instance for serving the StringTemplate example. */
AsyncWebServer server(80);
void setup()
{
/* Have to initialise before performing any SPIFFS operations*/
SPIFFS.begin();
ESPFlashString ssid(SSID_FILEPATH, DEFAULT_SSID);
Serial.begin(115200);
/* Configure access point with static IP address */
WiFi.mode(WIFI_AP);
WiFi.softAPConfig(
IPAddress(192, 168, 4, 1),
IPAddress(192, 168, 4, 1),
IPAddress(255, 255, 255, 0));
WiFi.softAP(ssid.get());
server.on("/", HTTP_GET, [](AsyncWebServerRequest *request)
{
request->send(200, "text/html", _SSIDEDIT);
});
server.on("/ssidedit", HTTP_GET, [](AsyncWebServerRequest *request)
{
AsyncWebParameter* p = request->getParam("SSID");
if(p->value() != "")
{
ESPFlashString ssid(SSID_FILEPATH);
ssid.set(p->value());
WiFi.softAPdisconnect(true);
WiFi.softAP(ssid.get());
}
else
{
request->redirect("/");
}
});
server.begin();
}
void loop()
{
}

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#include "ESPFlash.h"
#include <limits>
void setup()
{
Serial.begin(115200);
delay(500);
Serial.println("Starting!");
Serial.println();
SPIFFS.begin();
Serial.println("Formatting SPIFFS. Will take a while...");
SPIFFS.format();
unitTest<bool>("bool");
unitTest<char>("char");
unitTest<signed char>("signed char");
unitTest<unsigned char>("unsigned char");
unitTest<wchar_t>("wchar_t");
unitTest<int8_t>("int8_t");
unitTest<char16_t>("char16_t");
unitTest<char32_t>("char32_t");
unitTest<short>("short");
unitTest<unsigned short>("unsigned short");
unitTest<int>("int");
unitTest<unsigned int>("unsigned int");
unitTest<long>("long");
unitTest<unsigned long>("unsigned long");
unitTest<int16_t>("int16_t");
unitTest<int32_t>("int32_t");
unitTest<uint8_t>("uint8_t");
unitTest<uint16_t>("uint16_t");
unitTest<uint32_t>("uint32_t");
unitTest<float>("float");
unitTest<double>("double");
Serial.println("Done!");
}
void loop()
{
}
template<typename T> void unitTest(const char* testName)
{
Serial.print(testName);
Serial.println(" unit test... ");
String filename = "/";
filename += testName;
ESPFlash<T> test(filename.c_str());
T testData[10];
T checkGet;
T checkGetFront[5];
T checkGetBack[5];
/* Prepare test data */
for(int ii = 0; ii < 10; ii++)
{
testData[ii] = std::numeric_limits<T>::max()/(ii+1);
test.append(testData[ii]);
}
Serial.println("get TEST ");
checkGet = testData[0];
if(test.get() == checkGet)
{
Serial.println("SUCCESS!!!");
}
else
{
Serial.println("FAILED...");
Serial.print("test.getElementAt(ii) ");
Serial.println(test.get());
Serial.print("checkGet ");
Serial.println(checkGet);
}
Serial.println("getFrontElements TEST ");
if(!test.getFrontElements(checkGetFront, 5))
{
Serial.println("getFrontElements ERROR ");
}
for(int ii = 0; ii < 5; ii++)
{
if(checkGetFront[ii] == testData[ii])
{
Serial.println("SUCCESS!!!");
}
else
{
Serial.println("FAILED...");
Serial.print("checkGetFront[");
Serial.print(ii);
Serial.print("] ");
Serial.println(checkGetFront[ii]);
Serial.print("testData[");
Serial.print(ii);
Serial.print("] ");
Serial.println(testData[ii]);
}
}
Serial.println("getBackElements TEST ");
if(!test.getBackElements(checkGetBack, 5))
{
Serial.println("checkGetBack ERROR ");
}
for(int ii = 0; ii < 5; ii++)
{
if(checkGetBack[ii] == testData[ii+5])
{
Serial.println("SUCCESS!!!");
}
else
{
Serial.println("FAILED...");
Serial.println(checkGetBack[ii]);
Serial.print("checkGetBack[");
Serial.print(ii);
Serial.print("] ");
Serial.print("testData[");
Serial.print(ii+5);
Serial.print("] ");
Serial.println(testData[ii+5]);
}
}
Serial.println("getElementAt TEST ");
for(int ii = 0; ii < test.length(); ii++)
{
if(test.getElementAt(ii) == testData[ii])
{
Serial.println("SUCCESS!!!");
}
else
{
Serial.println("FAILED...");
Serial.print("test.getElementAt(");
Serial.print(ii);
Serial.print(") ");
Serial.println(test.getElementAt(ii));
Serial.print("testData[ii");
Serial.print(ii);
Serial.print("] ");
Serial.println(testData[ii]);
}
}
Serial.println();
}

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#include "ESPFlash.h"
#include <limits>
void setup()
{
Serial.begin(115200);
delay(500);
Serial.println("Starting!");
Serial.println();
SPIFFS.begin();
Serial.println("Formatting SPIFFS. Will take a while...");
SPIFFS.format();
unitTest<bool>("bool");
unitTest<char>("char");
unitTest<signed char>("signed char");
unitTest<unsigned char>("unsigned char");
unitTest<wchar_t>("wchar_t");
unitTest<int8_t>("int8_t");
unitTest<char16_t>("char16_t");
unitTest<char32_t>("char32_t");
unitTest<short>("short");
unitTest<unsigned short>("unsigned short");
unitTest<int>("int");
unitTest<unsigned int>("unsigned int");
unitTest<long>("long");
unitTest<unsigned long>("unsigned long");
unitTest<int16_t>("int16_t");
unitTest<int32_t>("int32_t");
unitTest<uint8_t>("uint8_t");
unitTest<uint16_t>("uint16_t");
unitTest<uint32_t>("uint32_t");
unitTest<float>("float");
unitTest<double>("double");
Serial.println("Done!");
}
void loop()
{
}
template<typename T> void unitTest(const char* testName)
{
Serial.print(testName);
Serial.println(" unit test... ");
String filename = "/";
filename += testName;
ESPFlash<T> test(filename.c_str());
test.set(std::numeric_limits<T>::min());
Serial.print("MIN TEST ");
if(test.get() == std::numeric_limits<T>::min())
{
Serial.println("SUCCESS!!!");
}
else
{
Serial.println("FAILED...");
Serial.print("test.get() ");
Serial.println(test.get());
Serial.print("std::numeric_limits<T>::min() ");
Serial.println(std::numeric_limits<T>::min());
}
test.set(std::numeric_limits<T>::max());
Serial.print("MAX TEST ");
if(test.get() == std::numeric_limits<T>::max())
{
Serial.println("SUCCESS!!!");
}
else
{
Serial.println("FAILED...");
Serial.println(test.get());
Serial.print("std::numeric_limits<T>::max() ");
Serial.println(std::numeric_limits<T>::max());
}
}

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#######################################
# Datatypes (KEYWORD1)
#######################################
ESPFlash KEYWORD1
ESPFlashCounter KEYWORD1
ESPFlashString KEYWORD1
#######################################
# Methods and Functions (KEYWORD2)
#######################################
set KEYWORD2
get KEYWORD2
reset KEYWORD2
decrement KEYWORD2
increment KEYWORD2
setElementAt KEYWORD2
setElements KEYWORD2
setElements_P KEYWORD2
append KEYWORD2
appendElements KEYWORD2
appendElements_P KEYWORD2
getElementAt KEYWORD2
getFrontElements KEYWORD2
getBackElements KEYWORD2
clear KEYWORD2
setFileName KEYWORD2
getFileName KEYWORD2

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name=ESPFlash
version=1.0.1
author=Dale Giancono <d.giancono@gmail.com>
maintainer=Dale Giancono <d.giancono@gmail.com>
sentence=Lightweight library that makes SPIFFs usage simple and easy to understand on the ESP8266 and ESP32.
paragraph=ESPFlash is an abstraction layer that simplifies the storing of vectorised data in the filesystem on the ESP8266 and ESP32. It features a simple template based interface to store and retreive generic vectorised data in flash memory using SPIFFs.
category=Other
url=https://github.com/DaleGia/ESPFlash
architectures=esp8266, esp32

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/*
ESPFlash.h
Copyright (c) 2020 Dale Giancono. All rights reserved..
This file defines the ESPFlash class. It is an abstraction layer that
simplifies the storing of vectorised data in the filesystem on the
ESP8266 and ESP32.
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 <https://www.gnu.org/licenses/>.
*/
#ifndef ESPFLASH_H_
#define ESPFLASH_H_
#if defined(ARDUINO_ARCH_ESP32)
#include <SPIFFS.h>
#endif
template<class T>
class ESPFlash
{
public:
ESPFlash();
/* Creates the ESPFlash instance. In practice it starts SPIFFS and gets the file name. */
ESPFlash(const char* fileName);
/* Gets the number of elements of type T stored in the ESPFlash instance.
* In practice it gets the ESPFlash file length in bytes using SPIFFS and divides the result
* by the size of type T.
*/
uint32_t length(void);
/* Truncates the associated ESPFlash SPIFFS file and creates the first element containing type T. */
/* Returns true if successful */
bool set(const T data);
/* Truncates the associated ESPFlash SPIFFS file and creates elements specified by Type T. */
/* Returns true if successful */
bool setElements(const T* data, uint32_t size);
/* Truncates the associated ESPFlash SPIFFS file and creates elements specified by Type T.
that are stored using PROGMEM. */
/* Returns true if successful */
bool setElements_P(const T* data, uint32_t size);
/* Opens the associated ESPFlash SPIFFS file and appends element containing type T. */
/* Returns true if successful */
bool append(const T data);
/* Opens the associated ESPFlash SPIFFS file and appends elements specified by Type T. */
/* Returns true if successful */
bool appendElements(const T* data, uint32_t size);
/* Opens the associated ESPFlash SPIFFS file and appends elements specified by Type T
that are stored using PROGMEM. */
/* Returns true if successful */
bool appendElements_P(const T* data, uint32_t size);
/* Gets the first element of type T stored in the associated ESPFlash SPIFFS file if it exists */
T get(void);
/* Gets the element of type T as specified by the index parameter if it exists. */
T getElementAt(uint32_t index);
/* Gets elements of Type T from the start of the file stored in the associated ESPFlash SPIFFS file if it exists */
/* Returns the number of elements "got" */
bool getFrontElements (T* data, uint32_t size);
/* Gets elements of Type T from the end of the file stored in the associated ESPFlash SPIFFS file if it exists */
/* Returns the number of elements "got" */
bool getBackElements(T* data, uint32_t size);
/* Deletes the associated ESPFlash SPIFFS file. */
/* Returns true if successful */
void clear(void);
void setFileName(const char*);
const char* getFileName(void);
private:
bool isInitialised = false;
char fileName[32];
enum WRITE_MODE
{
OVERWRITE = 0,
APPEND,
};
bool writeElement(const T data, enum WRITE_MODE mode);
bool writeElements(const T* data, uint32_t size, enum WRITE_MODE mode);
bool writeElements_P(const T* data, uint32_t size, enum WRITE_MODE mode);
};
template<class T> ESPFlash<T>::ESPFlash()
{
return;
};
template<class T> ESPFlash<T>::ESPFlash(const char* fileName)
{
setFileName(fileName);
return;
};
template<class T> uint32_t ESPFlash<T>::length(void)
{
File file;
uint32_t sizeInBytes;
uint32_t numberOfElements;
numberOfElements = 0;
if(isInitialised == true)
{
sizeInBytes = 0;
/* Open the file specified by the filename with read privileges*/
file = SPIFFS.open(this->fileName, "r");
if(file)
{
/* Get the size of the file in bytes */
sizeInBytes = file.size();
/* Calculate number of elements by dividing by size of type T */
numberOfElements = sizeInBytes/sizeof(T);
}
file.close();
}
return numberOfElements;
}
template<class T> bool ESPFlash<T>::set(const T data)
{
return writeElement(data, WRITE_MODE::OVERWRITE);
};
template<class T> bool ESPFlash<T>::setElements(const T* data, uint32_t size)
{
return writeElements(data, size, WRITE_MODE::OVERWRITE);
};
template<class T> bool ESPFlash<T>::setElements_P(const T* data, uint32_t size)
{
return writeElements_P(data, size, WRITE_MODE::OVERWRITE);
};
template<class T> bool ESPFlash<T>::append(const T data)
{
return writeElement(data, WRITE_MODE::APPEND);
};
template<class T> bool ESPFlash<T>::appendElements(const T* data, uint32_t size)
{
return writeElements(data, size, WRITE_MODE::APPEND);
};
template<class T> bool ESPFlash<T>::appendElements_P(const T* data, uint32_t size)
{
return writeElements_P(data, size, WRITE_MODE::APPEND);
};
template<class T> T ESPFlash<T>::get(void)
{
T value;
if(isInitialised == true)
{
File file = SPIFFS.open(this->fileName, "r");
file.read((uint8_t*)&value, sizeof(T));
file.close();
}
return value;
};
template<class T> T ESPFlash<T>::getElementAt(uint32_t index)
{
T value;
uint32_t bytesRead;
File file;
if(isInitialised == true)
{
bytesRead = 0;
value = (T)0;
if(index < length())
{
file = SPIFFS.open(this->fileName, "r");
if(file)
{
file.seek(index*sizeof(T), SeekSet);
bytesRead = file.read((uint8_t*)&value, sizeof(T));
/* Check if successful by the number of bytes read */
if(bytesRead != sizeof(T))
{
/* An error has occured */
value = (T)0;
}
}
file.close();
}
}
return value;
};
template<class T> bool ESPFlash<T>::getFrontElements(T* data, uint32_t size)
{
File file;
uint32_t numberOfBytes;
uint32_t bytesRead;
bool success;
success = false;
if(isInitialised == true)
{
numberOfBytes = sizeof(T)*size;;
bytesRead = 0;
/* Open the file specified by the filename with read privileges*/
file = SPIFFS.open(this->fileName, "r");
if(size <= length())
{
if(file)
{
bytesRead = file.read((uint8_t*)data, numberOfBytes);
/* Check if successful by the number of bytes read */
if(bytesRead == numberOfBytes)
{
success = true;
}
}
}
file.close();
}
return success;
};
template<class T> bool ESPFlash<T>::getBackElements(T* data, uint32_t size)
{
File file;
uint32_t numberOfBytes;
uint32_t firstElementIndex;
uint32_t bytesRead;
bool success;
success = false;
if(isInitialised == true)
{
bytesRead = 0;
numberOfBytes = sizeof(T)*size;
firstElementIndex = 0;
/* Open the file specified by the filename with read privileges*/
file = SPIFFS.open(this->fileName, "r");
if(size < length())
{
firstElementIndex = file.size() - numberOfBytes;
if(file)
{
file.seek(firstElementIndex, SeekSet);
bytesRead = file.read((uint8_t*)data, numberOfBytes);
file.close();
/* Check if successful by the number of bytes read */
if(bytesRead == numberOfBytes)
{
success = true;
}
}
}
file.close();
}
return success;
};
template<class T> void ESPFlash<T>::clear(void)
{
if(isInitialised == true)
{
SPIFFS.remove(this->fileName);
}
return;
};
template<class T> bool ESPFlash<T>::writeElement(const T data, WRITE_MODE mode)
{
File file;
uint32_t bytesWritten;
bool success;
success = false;
if(isInitialised == true)
{
bytesWritten = 0;
/*open file specified by fileName with write privileges*/
if(WRITE_MODE::OVERWRITE == mode)
{
file = SPIFFS.open(this->fileName, "w");
}
else if(ESPFlash::APPEND == mode)
{
file = SPIFFS.open(this->fileName, "a");
}
else
{
/* error */
return success;
}
if(file)
{
/* Write type T to SPIFFS */
bytesWritten = file.write((uint8_t*)&data, sizeof(T));
/* Check if successful by the number of bytes written */
/* If not successful, delete the file that was possibly
* created to make sure data does not end up being
* corrupted */
if(bytesWritten == sizeof(T))
{
success = true;
}
else
{
SPIFFS.remove(this->fileName);
}
}
file.close();
}
return success;
};
template<class T> bool ESPFlash<T>::writeElements(const T* data, uint32_t size, enum WRITE_MODE mode)
{
File file;
uint32_t bytesWritten;
uint32_t elementsSizeInBytes;
bool success;
success = false;
if(isInitialised == true)
{
bytesWritten = 0;
/*open file specified by fileName with write privileges*/
if(WRITE_MODE::OVERWRITE == mode)
{
file = SPIFFS.open(this->fileName, "w");
}
else if(WRITE_MODE::APPEND == mode)
{
file = SPIFFS.open(this->fileName, "a");
}
else
{
/* error */
return success;
}
if(file)
{
elementsSizeInBytes = sizeof(T)*size;
/* Write type T to SPIFFS */
bytesWritten = file.write((uint8_t*)data, elementsSizeInBytes);
/* Check if successful by the number of bytes written */
/* If not successful, delete the file that was possibly
* created to make sure data does not end up being
* corrupted */
if(bytesWritten == elementsSizeInBytes)
{
success = true;
}
else
{
SPIFFS.remove(this->fileName);
}
}
file.close();
}
return success;
};
template<class T> bool ESPFlash<T>::writeElements_P(const T* data, uint32_t size, enum WRITE_MODE mode)
{
File file;
uint32_t bytesWritten;
uint32_t elementsSizeInBytes;
bool success;
success = false;
if(isInitialised == true)
{
elementsSizeInBytes = sizeof(T)*size;
uint8_t buffer[elementsSizeInBytes];
bytesWritten = 0;
memcpy_P(buffer, data, elementsSizeInBytes);
/*open file specified by fileName with write privileges*/
if(WRITE_MODE::OVERWRITE == mode)
{
file = SPIFFS.open(this->fileName, "w");
}
else if(WRITE_MODE::APPEND == mode)
{
file = SPIFFS.open(this->fileName, "a");
}
else
{
/* error */
return success;
}
if(file)
{
/* Write type T to SPIFFS */
bytesWritten = file.write((uint8_t*)buffer, elementsSizeInBytes);
/* Check if successful by the number of bytes written */
/* If not successful, delete the file that was possibly
* created to make sure data does not end up being
* corrupted */
if(bytesWritten == elementsSizeInBytes)
{
success = true;
}
else
{
SPIFFS.remove(this->fileName);
}
}
file.close();
}
return success;
};
template<class T> void ESPFlash<T>::setFileName(const char* fileName)
{
if(strlen(fileName) < 31)
{
strcpy(this->fileName, fileName);
}
else
{
strncpy(this->fileName, fileName, 27);
char* pch = strrchr(fileName, '.');
strcpy(this->fileName+27, pch);
}
isInitialised = true;
return;
}
template<class T> const char* ESPFlash<T>::getFileName(void)
{
return this->fileName;
}
#endif /*ESPFLASHDATA_H_*/

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/*
ESPFlashCounter.h
Copyright (c) 2020 Dale Giancono. All rights reserved..
This file defines the ESPFlashCounter class. It can be used as a way
of keeping count of something, with the counter value stored in flash
using SPIFFS. It's value can be set to any integer value, or the values
can incremented and decremented. It can be reset to initial starting value
(or 0 if that is not defined), and can be retreived in String or int form.
It is particularly useful if I counter value is required through power
cycles.
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 <https://www.gnu.org/licenses/>.
*/
#ifndef ESPFLASHCOUNTER_H_
#define ESPFLASHCOUNTER_H_
#include "ESPFlash.h"
class ESPFlashCounter
{
public:
ESPFlashCounter(const char* name, int initialValue = 0);
void decrement(void);
void increment(void);
void set(int value);
void reset(void);
int get(void);
private:
int initialValue;
ESPFlash<int> espFlash;
};
ESPFlashCounter::ESPFlashCounter(const char* fileName, int initialValue)
{
this->initialValue = initialValue;
this->espFlash.setFileName(fileName);
if(!SPIFFS.exists(fileName))
{
set(this->initialValue);
}
}
void ESPFlashCounter::decrement(void)
{
int value;
value = espFlash.get();
espFlash.set(--value);
return;
}
void ESPFlashCounter::increment(void)
{
int value;
value = espFlash.get();
espFlash.set(++value);
return;
}
void ESPFlashCounter::set(int value)
{
espFlash.set(value);
}
void ESPFlashCounter::reset(void)
{
set(this->initialValue);
return;
}
int ESPFlashCounter::get(void)
{
int value;
value = espFlash.get();
return value;
}
#endif /*ESPFLASHCOUNTER_H_*/

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/*
ESPFlashString.h
Copyright (c) 2020 Dale Giancono. All rights reserved..
This file defines the ESPFlashString class. It provides a user friendly
way to store strings in SPIFFs.
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 <https://www.gnu.org/licenses/>.
*/
#ifndef ESPFLASHSTRING_H_
#define ESPFLASHSTRING_H_
#include "ESPFlash.h"
class ESPFlashString
{
public:
ESPFlashString(const char* fileName, String defaultString = String());
ESPFlashString(const char* fileName, const char* defaultString);
void set(String string);
void set(const char* string);
void reset(void);
String get(void);
private:
String defaultString;
ESPFlash<char> espFlash;
};
ESPFlashString::ESPFlashString(const char* fileName, String defaultString)
{
this->defaultString = defaultString;
this->espFlash.setFileName(fileName);
if(!SPIFFS.exists(fileName))
{
set(this->defaultString);
}
}
ESPFlashString::ESPFlashString(const char* fileName, const char* defaultString)
{
this->defaultString = defaultString;
this->espFlash.setFileName(fileName);
if(!SPIFFS.exists(fileName))
{
set(this->defaultString);
}
}
void ESPFlashString::set(String string)
{
espFlash.setElements(string.c_str(), string.length()+1);
}
void ESPFlashString::set(const char* string)
{
espFlash.setElements(string, strlen(string)+1);
}
void ESPFlashString::reset(void)
{
set(this->defaultString);
return;
}
String ESPFlashString::get(void)
{
char string[espFlash.length()];
espFlash.getFrontElements(string, espFlash.length());
return String(string);
}
#endif /*ESPFLASHSTRING_H_*/