Load screen after digital write

How-to
, ,
1

Description

Hi i have a problem. I would need a load screen and after blink with led. But now when i click on the button led blink and only after that screen load. Where is a problem please ? Thank you very much.

What MCU/Processor/Board and compiler are you using?

ESP32
3.5" inch TFT

What LVGL version are you using?

8.3.3

Code to reproduce

Add a code snippet which can run in the simulator. It should contain only the relevant code that compiles without errors when separated from your main code base.

The code block(s) should be formatted like:

void ta_event_show(lv_event_t *e) {
  lv_event_code_t code = lv_event_get_code(e);
  lv_obj_t *ebutton = lv_event_get_target(e);
  lv_obj_t *error = lv_event_get_target(e);
  lv_obj_t *entryinput = (lv_obj_t *)lv_event_get_user_data(e);
  String entrycode;

  if (code == LV_EVENT_CLICKED) {
    entrycode = String(lv_textarea_get_text(entryinput));
    if (entrycode == String(1234)) {
      lv_scr_load_anim(ui_Screen3, LV_SCR_LOAD_ANIM_NONE, 0, 0, true);
      digitalWrite(33, HIGH);  // turn the LED on
      delay(10000);
      digitalWrite(33, LOW);  // turn the LED on
    } else {
      lv_scr_load_anim(ui_Screen2, LV_SCR_LOAD_ANIM_NONE, 0, 0, true);
    }
  }
}

Screenshot and/or video

Snímek obrazovky 2022-11-29 v 16.43.40
Snímek obrazovky 2022-11-29 v 16.43.401112×710 90.3 KB

2

You’re using a 10s delay. What did you expect would happen?
That delay is blocking the entire app from running.
Build a non blocking led blink function and call it there

3

And how i make non blocking function please ? I create app when i click on button load screen2 and start led for 10 sec, after this i would like load screen1 and stop led. Please how i make this ?

4

Try this :wink:

5

Try set the pin high, then use an lv timer to call a custom function that counts 10 elapsed seconds and then pulls the led low and kills the timer.