Examples of working with esp32 or stm32 and displays

[brightproject]

Can anyone tell me if this scheduler has been used for tasks more complex than blinking LEDs or outputting messages to a serial?
For example, working with displays, or even better, working with the lvgl graphics library?

Does the library have the ability to work with a dual-processor esp32s3 microcontroller?
Is there some kind of analog of a mutex like in freeRTOS?

https://docs.lvgl.io/master/details/integration/adding-lvgl-to-your-project/threading.html#method-2-use-a-mutex

I would be glad to have a constructive discussion with engineers😀

[Biancaa-R]

Hi , based on my understanding
Yes, the Helios scheduler can definitely handle more than basic LED blinking or UART prints — but ..

It has been used for moderately complex tasks like driving SPI/I²C displays (SSD1306, ST7735, etc.) and updating sensor dashboards, as long as the drivers are non-blocking. For something like LVGL, it’s possible too — you just need to call lv_timer_handler() periodically from a Helios task and make sure all GUI updates happen from the same context (or are protected).

LVGL keeps internal data structures for things like:

Display buffers

Active screens and widgets

Animation lists

These aren’t protected by default — meaning if two tasks modify the GUI at once, LVGL can crash or corrupt memory.
That’s why LVGL’s docs say:

“All LVGL API functions must be called from the same thread, or protected by a mutex.”

So LVGL itself doesn’t block — you just need to make sure no two threads/tasks access it simultaneously.

In a single-threaded (or cooperative) environment like Helios, that’s simple:

Just make all LVGL calls from one task.

No mutex is even needed in that case.

Regarding the dual-core ESP32-S3, Helios itself doesn’t implement SMP scheduling. You can manually pin the scheduler to one core and run other workloads (like display refresh) on the second core, but inter-core communication will have to be handled manually (via queues, shared buffers, or simple sync flags).

[MannyPeterson]

Thank you @Biancaa-R for the response. 🙏🙏🙏🙏

[Biancaa-R]

Thank you @Biancaa-R for the response. 🙏🙏🙏🙏

Sure :)

[brightproject]

Thank you @Biancaa-R for the response. 🙏🙏🙏🙏

I would like not just words and theory, but concrete examples of working with lvgl😀

[Biancaa-R]

Thank you @Biancaa-R for the response. 🙏🙏🙏🙏

I would like not just words and theory, but concrete examples of working with lvgl😀

Hmmm hmm ,If I work on something related to this after this ,Ill send it across.

[MannyPeterson]

Thank you @Biancaa-R for the response. 🙏🙏🙏🙏

I would like not just words and theory, but concrete examples of working with lvgl😀

Hmmm hmm ,If I work on something related to this after this ,Ill send it across.

@Biancaa-R I suggest waiting on any new implementations. Helios 0.5.0 is coming out and there are important improvements. Feel free to check out the develop branch for a sneak peek. 🙂