How to Assign SPIFFS File Names to a Variable on ESP32

Описание: Learn how to dynamically load file names from `SPIFFS` on an ESP32 and display images using TFT with a simple code implementation.
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How to Assign SPIFFS File Names to a Variable on ESP32

As a beginner programmer, tackling the exciting world of embedded systems can feel overwhelming, especially when dealing with file systems like SPIFFS (Serial Peripheral Interface Flash File System) on the ESP32. One common challenge you might face is how to dynamically assign the names of files stored in SPIFFS to variables in your code. In this guide, we’ll explore how to achieve that by loading JPEG images from SPIFFS and displaying them on a TFT screen without hardcoding the file names.

Understanding the Problem

You might be working on a project that retrieves JPEG images from the local filesystem of your ESP32 and displays these images on an attached TFT screen. If you’re currently hardcoding file names into your code, you could end up with less flexibility and a lot more manual updates to your code. Instead, let’s find a better approach that allows your program to automatically read and load filenames.

The Solution: Dynamic File Loading

To dynamically assign the filename to a variable, we can utilize the File class provided by the SPIFFS library. Here’s a breakdown of how you can implement this:

Step 1: Initialize SPIFFS

Before we can read files from SPIFFS, we need to make sure it is correctly initialized in the setup() function of your program. This is what it looks like:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Read File Names in the Loop

Instead of defining a separate function just to get the file name, you can read the filenames directly in your loop() function. Here's how you can structure it:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Displaying the Images

By leveraging the file.name() method, you dynamically obtain the current file name and pass it into the drawJpeg() function. This allows you to display the images sequentially on the TFT screen.

Summary of the Implementation Steps

Initialize SPIFFS: Ensure that the SPIFFS library is properly set up in your code.

Loading Files: Use a loop to access each file in the SPIFFS and retrieve its name.

Display Images: Call your drawJpeg() function using the dynamically retrieved filename to show images.

By adopting this solution, you can free your code from hardcoded file names, making it more adaptable for future modifications and enhancements.

Conclusion

With just a few simple changes, you can turn your static program into a dynamic one that beautifully reads and displays files from your ESP32's SPIFFS. This not only simplifies your code maintenance but also opens up new avenues for your projects. Experiment with these concepts and take your coding skills to new heights!

Happy coding, and may your images always be vibrant!