heliosproj
Examples of working with esp32 or stm32 and displays
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😀
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).
Thank you @Biancaa-R for the response. 🙏🙏🙏🙏
I would like not just words and theory, but concrete examples of working with lvgl😀
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.
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. 🙂