This repo should be reworked to make people easier to get started.

My vision is the following

Simple examples

Add very simple examples. It would be nice to use these examples in the documentation too (add lv_examples as a submodule to docs). I was collecting the recurring questions which could be answered with examples:

• [x] mbox: modal (@embeddedt, lv_ex_mbox_2)
• [x] slider: move the slider and set a label's text (@embeddedt, lv_ex_slider_2)
• [ ] button: styling
• [x] image: recolor (@embeddedt, lv_ex_img_2)
• [ ] label: styling
• [x] label: text shadow (@embeddedt, lv_ex_label_2)
• [x] text area: password and one line mode (@embeddedt, lv_ex_ta_2)
• [ ] text area: finish on Enter
• [ ] text area: format text (e.g automatically add dots for IP address)
• [ ] image: slide show animation
• [ ] image: mosaic wallpaper
• [x] display driver test (aded in FAQ)

Ready to use / easy to modify applications

• [x] Android like menu LINK
• [ ] Car dashboard
• [ ] File browser
• [ ] Home automatization
• [ ] Audio players
• [ ] WiFi connect
• [ ] All in one example to show LittlevGL's features Example

External libraries

Create a separate repo for examples when external libraries are used:

• [x] PNG decoder
• [ ] JPG decoder
• [ ] Video player
• [x] QR code
• [x] FatFS and Windows/Unix fs integration. Here I've already started something
• [x] FreeType

Blog post

Create blog posts about longer, more complex topics

• [ ] responsive: fit, auto realign, layout, LV_DPI
• [ ] optimizations for monocrome: round, pixel_wr
• [ ] OSD menu
• [x] FAQ: added to the documentation's welcome page instead

Tutorials

• lv_tutorial should be removed as it makes the examples and documentation fragile

Tests

• lv_tests are not designed for the users, so they can go to a separate repo: lv_tets

Feedback is very welcome

These are my micropython examples. I tried to do a "word by word" translation from the C originals. The examples using images may not run yet on the simulator. However, I prepared examples with the extension ...sim.py for which a conversion to a program running on the simulator should be easy. Only the filename of the binary file must be changed to the URL of the binary image. Please check

@embeddedt I've released v7.6.1 but now the live examples are not working. It shows 404 error instead of the examples and I can't find the html files anywhere.

BTW, if the html files are added into the gh-pages branch how can we manage more branches (other than the master)?

Hello

See my configuration below. All demos works, except lv_demo_widgets. Is there maybe a bug?

Thank you

  //lv_demo_music(); // OK
  lv_demo_widgets(); // NOT OK
  //lv_demo_benchmark(); // OK
  //lv_demo_keypad_encoder(); // OK
  //lv_demo_stress(); // OK

[env:disco_f746ng]
platform = ststm32
board = disco_f746ng
framework = arduino
lib_deps = 
	lvgl/lv_examples@^8.1.1-dev
	lvgl/lvgl@^8.1.0

When compiling the examples with the Makefile I get an error:

lv_examples/src/lv_demo_stress/lv_demo_stress.c:246:37: error: cast between incompatible function types from ‘void (*)(lv_obj_t *, uint16_t)’ {aka ‘void (*)(struct _lv_obj_t *, short unsigned int)’} to ‘void (*)(void *, lv_anim_value_t)’ {aka ‘void (*)(void *, short int)’} [-Werror=cast-function-type]
  246 |             lv_anim_set_exec_cb(&a, (lv_anim_exec_xcb_t)lv_arc_set_end_angle);
      |                                     ^
lv_examples/src/lv_demo_stress/lv_demo_stress.c:256:37: error: cast between incompatible function types from ‘void (*)(lv_obj_t *, uint16_t)’ {aka ‘void (*)(struct _lv_obj_t *, short unsigned int)’} to ‘void (*)(void *, lv_anim_value_t)’ {aka ‘void (*)(void *, short int)’} [-Werror=cast-function-type]
  256 |             lv_anim_set_exec_cb(&a, (lv_anim_exec_xcb_t)lv_linemeter_set_angle_offset);

I got rid of it adding -Wno-cast-function-type I am using gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0

I've a basic script, based on lv_examples/lv_tutorial/1_hello_world:

/* gui.c */
#include "lvgl/lvgl.h"

int main()
{	 	 
    return 0;
}

void gui(void)
{
    lv_obj_t * scr = lv_disp_get_scr_act(NULL); /* just one line from the example */
}

I compile it with gcc gui.c and get the following error:

/tmp/cca5tFm7.o: In function `gui':
gui.c:(.text+0x2c): undefined reference to `lv_disp_get_scr_act'
collect2: error: ld returned 1 exit status

Where does lv_disp_get_scr_act() come from and what am I missing?

Thanks in advance!

Updated lvgl from v8.1 to 8.3.1 and seeing errors due to changes in lv_obj_draw_part_dsc_t, I think a property was renamed.

I think I can fix it, would a PR to correct be something you'd consider accepting upstream?

I made the lv_demo_widgetsfrom lv_examples buildable with the Arduino IDE for an ESP32 board and a 480x320 display. I also update the lvgl library. Most changes were done by text replacements:

1. replace #if defined(LV_LVGL_H_INCLUDE_SIMPLE) with #if defined(LV_LVGL_H_INCLUDE_SIMPLE) || defined( ARDUINO )

2. replace #include <lv_examples/lv_demo.h> with #ifdef ARDUINO #include <lv_demo.h> #else #include <lv_examples/lv_demo.h> #endif

3. replace e == with e->code ==

This seems to be related to deleting the mbox in mbox_action.

I'm running this under mbed but not multi-threading. I'm using the NUCLEO-F446RE dev board with this display connected in 16-bit parallel. lv_tic_inc and lv_task_handler are called from the main loop context, not from a timer. I can get it to not crash if I hide the mbox instead of deleting it in mbox_action.

In mbox_action, if I call

lv_obj_set_hidden(lv_obj_get_parent(mbox), true); 

instead of

lv_obj_del(lv_obj_get_parent(mbox));

The app does not crash. If I create a variable to save the mbox on creation

static lv_obj_t * mbox = NULL;

Then I can change enable_action to delete the 'old' mbox and create a new one. This works fine.

static lv_res_t enable_action(lv_obj_t * btn)
{
   /*If the butto nsi released the show message box to be sure about the Enable*/
   if(lv_btn_get_state(btn) == LV_BTN_STATE_REL) {
      if (mbox != NULL) {
         printf("mbox existed previously, deleting prior to creating new.\r\n");
         lv_obj_del(lv_obj_get_parent(mbox));    /*Delete the black background. (it will delete the mbox too)*/
      }
...
      /*Create a message box*/
      //lv_obj_t * mbox = lv_mbox_create(bg, NULL);
      mbox = lv_mbox_create(bg, NULL);

Based on the crash report and the memory map, it seems to be crashing in memcpy after the object is deleted.

Is it possible that somehow a touch is trying to be delivered to the deleted mbox and deleting it later is ok?

Hello

With benchmark or keypad demo, sometimes I see wrong pixel/lines, see pictures below. What's that? Do I have possibly a bug with my display driver code?

Thank you

hi,I use the following code,An error occurred,maybe 《lv_fs_file_t * file_p》 Parameter transfer error void test(void) { lv_obj_t *img; img = lv_img_create(lv_scr_act(), NULL); lv_img_set_src(img, "c:/1.bin"); } but i used gif testcode,no error occurred; void gif_demo(void) { lv_obj_t * img = lv_gif_create_from_file(lv_scr_act(), "c:/1.gif");

}

I USE LVGL "LV_EXAMPLES"&"LVGL_NEW_FS_API"&"lv_fs_if"&"lv_lib_gif"