arduino-IDE-DAT

// Periodically blink the onboard LED while listening for serial commands
if ((int)(millis()/500) > lastPeriod)
{
    lastPeriod++;
    pinMode(LED, OUTPUT);
    digitalWrite(LED, lastPeriod%2);
}

common folder

windows

ETH.h

C:\Users\Administrator\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.6\libraries\Ethernet\src\eth.h
C:\Users\Administrator\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.6\libraries\Ethernet\src\eth.cpp

arduino15

You can open it by pressing Win + R, typing: %LOCALAPPDATA%\Arduino15

Cut the Arduino15 folder.

Paste it somewhere on D drive, for example: D:\Arduino15

Open Command Prompt as Administrator and run: mklink /D "%LOCALAPPDATA%\Arduino15" "D:\Arduino15"

export compiled binary

cmd /C copy C:\Users\ADMINI~1\AppData\Local\Temp\arduino_build_572672\rf-motor.ino_attiny13a_4800000L.lst E:\Git-category\Git-Arduino\arduino-main2\Sketchbook\attiny-app\rf-motor 
        1 file(s) copied.

rf-motor.ino.with_bootloader_attiny13a_4800000L.hex
rf-motor.ino_attiny13a_4800000L.hex
rf-motor.ino_attiny13a_4800000L.lst

avrdude-dat

arduino IDE 2.x

compare to arduino version 1.x

LittleFS

LittleFS is a lightweight filesystem created for microcontrollers that lets you access the flash memory as you do in a standard file system on your computer, but it’s simpler and more limited. You can read, write, close, and delete files. Using LittleFS with the ESP32 boards is useful to:

Create configuration files with settings;
Save data permanently;
Create files to save small amounts of data instead of using a microSD card;
Save HTML, CSS, and JavaScript files to build a web server;
Save images, figures, and icons;
And much more.

download from release https://github.com/earlephilhower/arduino-littlefs-upload/releases

On your computer, go to the following path: C:\Users<username>.arduinoIDE. Create a new folder called plugins if you haven’t already.

C:\Users\Administrator.arduinoIDE\plugins\arduino-littlefs-upload-1.5.4.vsix

Move the .vsix file you downloaded previously to the plugins folder (remove any other previous versions of the same plugin if that’s the case).

test code

#include "LittleFS.h"

void setup() {
Serial.begin(115200);

if(!LittleFS.begin()){
    Serial.println("An Error has occurred while mounting LittleFS");
    return;
}

File file = LittleFS.open("/test_example.txt", "r");
if(!file){
    Serial.println("Failed to open file for reading");
    return;
}

Serial.println("File Content:");
while(file.available()){
    Serial.write(file.read());
}
file.close();
}

void loop() {

}

ref

our repositories