Best posts made by Natter_LT

Yestedray at late night finaly managed to work, to do this I deleted almost all code from ui.ino file, used Lilygo suplied libraries of lvgl, now code of ui.ino looks like this:

#include <LilyGo_RGBPanel.h>
#include <LV_Helper.h>
#include <TFT_eSPI.h>
#include <ui.h>

LilyGo_RGBPanel panel;

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

// Initialize T-RGB, if the initialization fails, false will be returned.
if (!panel.begin()) {
    while (1) {
        Serial.println("Error, failed to initialize T-RGB"); delay(1000);
    }
}

// Call lvgl initialization
beginLvglHelper(panel);


ui_init();

Serial.println( "Setup done" );
panel.setBrightness(16);    

}

void loop()
{
lv_timer_handler(); /* let the GUI do its work */
delay(5);
}

Later will make SLS template, thanks for advices ;-).