Label object, symbol instead of a space?

How-to
1

Hello,

With the following label setup I see a symbol instead of a space (see also picture below).
I do not understand this?

Thank you

	//Write codes screen_label_5
	ui->screen_label_5 = lv_label_create(ui->screen);
	lv_obj_set_pos(ui->screen_label_5, 314, 266);
	lv_obj_set_size(ui->screen_label_5, 145, 32);
	lv_label_set_text(ui->screen_label_5, "START with ");
	lv_label_set_long_mode(ui->screen_label_5, LV_LABEL_LONG_WRAP);
	lv_obj_set_style_text_align(ui->screen_label_5, LV_TEXT_ALIGN_CENTER, 0);

	//Write style state: LV_STATE_DEFAULT for style_screen_label_5_main_main_default
	static lv_style_t style_screen_label_5_main_main_default;
	lv_style_reset(&style_screen_label_5_main_main_default);
	lv_style_set_radius(&style_screen_label_5_main_main_default, 0);
	lv_style_set_bg_color(&style_screen_label_5_main_main_default, lv_color_make(0x21, 0x95, 0xf6));
	lv_style_set_bg_grad_color(&style_screen_label_5_main_main_default, lv_color_make(0x21, 0x95, 0xf6));
	lv_style_set_bg_grad_dir(&style_screen_label_5_main_main_default, LV_GRAD_DIR_VER);
	lv_style_set_bg_opa(&style_screen_label_5_main_main_default, 0);
	lv_style_set_text_color(&style_screen_label_5_main_main_default, lv_color_make(0xff, 0xff, 0xff));
	lv_style_set_text_font(&style_screen_label_5_main_main_default, &lv_font_montserratMedium_14);
	lv_style_set_text_letter_space(&style_screen_label_5_main_main_default, 2);
	lv_style_set_pad_left(&style_screen_label_5_main_main_default, 0);
	lv_style_set_pad_right(&style_screen_label_5_main_main_default, 0);
	lv_style_set_pad_top(&style_screen_label_5_main_main_default, 0);
	lv_style_set_pad_bottom(&style_screen_label_5_main_main_default, 0);
	lv_obj_add_style(ui->screen_label_5, &style_screen_label_5_main_main_default, LV_PART_MAIN|LV_STATE_DEFAULT);

image

2
  1. You generated font w/o “space” symbol
  2. You used not real space symbol in string. f.e. " "
3

I just checked all my fonts, there is no font which has defined /* U+0020 " " */ … so what now?
Simply adding following to the font C File does not help.

/* U+0020 " " */
	0x0,
4

this is not enough. Font have harder structure. Char mapping and symbols sizes in structures later.