keyboard input didn't work

[mess-maker]

hi,

I'm following the LearnLVGL Version 9 course from Mair Swartz

setup :
vscode running on Windows 11
WSL2 for the dev on platformio (opensuse tumbleweed) sdl2 and sdl2-compat installed

I have made plenty of small project with some widget following the course with no issue, so the setup seems ok (no compile issue)

exept when I use a text area object, the keyboard input are not taken

• no text appear in the widget
• nothing retreivable by lv_textarea_get_text

here the code

#include "lvgl.h"
#include "app_hal.h"

void basic_keyboard(void);
void on_text_changed(lv_event_t* event);

void on_text_changed(lv_event_t* event)
{
    if (lv_event_get_code(event)==LV_EVENT_VALUE_CHANGED)
    {
        lv_obj_t* text_input = lv_event_get_target_obj(event);
        lv_log("Text is: %s\n", lv_textarea_get_text(text_input));

    }
}

void basic_keyboard(void)
{
    lv_obj_t* text_input = lv_textarea_create(lv_screen_active());
    lv_obj_add_event_cb(text_input, on_text_changed, LV_EVENT_ALL, NULL);
}



int main(void)
{
	lv_init();
	hal_setup();
        basic_keyboard();

	hal_loop();
}

and the platformio.ini

[platformio]
default_envs = emulator_64bits

; Shared options
[env]
build_flags =
  ; Don't use lv_conf.h. Tweak params via platform.ini.
  -D LV_CONF_SKIP
  -D LV_CONF_INCLUDE_SIMPLE
  ; Enable LVGL demo, remove when working on your own project
  ; -D LV_USE_DEMO_WIDGETS=1
  ; Add more defines below to override lvgl:/src/lv_conf_simple.h
lib_deps =
  ; Use direct URL, because package registry is unstable
  lvgl@9.3
lib_archive = false


[env:emulator_64bits]
platform = native@^1.1.3
extra_scripts = 
  pre:support/sdl2_paths.py ; Tries to find SDL2 include and lib paths on your system - specifically for MacOS w/ Homebrew
  post:support/sdl2_build_extra.py
build_flags =
  ${env.build_flags}
  -D LV_USE_LOG=1
  -D LV_LOG_LEVEL=LV_LOG_LEVEL_WARN
  -D LV_LOG_PRINTF=1
  -D LV_USE_SYSMON=1
  -D LV_USE_PERF_MONITOR=1
  -D LV_USE_STDLIB_MALLOC=LV_STDLIB_BUILTIN
  -D LV_USE_MEM_MONITOR=1
  ; Add recursive dirs for hal headers search
  !python -c "import os; print(' '.join(['-I {}'.format(i[0].replace('\x5C','/')) for i in os.walk('hal/sdl2')]))"
  -lSDL2
  ; SDL drivers options
  -D LV_LVGL_H_INCLUDE_SIMPLE
  -D LV_DRV_NO_CONF
  -D LV_USE_SDL

  -D SDL_HOR_RES=480
  -D SDL_VER_RES=320  
  -D SDL_ZOOM=1
  -D LV_SDL_INCLUDE_PATH="\"SDL2/SDL.h\""

  ; LVGL memory options, setup for the demo to run properly
  -D LV_MEM_CUSTOM=1
  -D LV_MEM_SIZE="(128U * 1024U)"
  
lib_deps =
  ${env.lib_deps}
build_src_filter =
  +<*>
  +<../hal/sdl2>

Am I missing someting
tried to add -D LV_USE_KEYBOARD=1 with no effet :/

[mess-maker]

tried the same thing with ubuntu 26.04 in wsl (sdl2-dev installed) with same issue :/

[mess-maker]

investigated a bit more, the keyboard input don't work either in the lv_demo_widgets()
so this does not come from my code

using the visualstudio simulator (https://github.com/lvgl/lv_port_pc_visual_studio) the keyboard input work as expected in the demo

[mess-maker]

managed to make it work with this main function where i comment out the hal_setup() and make group with (the keyboard and text area)

dirty code (sorry) I let some line commented that don't seems necessary
now I don't know how to implement that nicely, so that I can keep the hal_setup() and be able to make the group

here the working main

int main(void)
{
lv_init();
 //hal_setup();

  lv_display_t * disp = lv_sdl_window_create(SDL_HOR_RES, SDL_VER_RES);
  lv_indev_t * mouse = lv_sdl_mouse_create();
  lv_indev_t * mousewheel = lv_sdl_mousewheel_create();
  lv_indev_t * keyboard = lv_sdl_keyboard_create();

  //lv_indev_set_mode(keyboard, LV_INDEV_MODE_NONE);

  lv_group_t * group = lv_group_create();
  lv_indev_set_group(keyboard, group);

  lv_obj_t * ta = lv_textarea_create(lv_screen_active());

  lv_group_add_obj(group, ta);
  //lv_group_focus_obj(ta);

hal_loop();
}