ESP32 Forum

Hi Forum.

I am not able to compile when I install latest lvgl and lvgl_esp32_drivers. Is there a problem with the newest lvgl and the current drivers? I get a bunch of "unknown type name" upon compiling, even without any real code. Should I try and use an older version og lvgl, or is there a better workaround?

Br Frank.

Hi forum.

The compile errors are these
I use platformio, latest esp-idf 5.2.1, and latest lvgl and lvgl_esp32_drivers cloned from git into a components folder.

Have you found a solution by any chance? I'm facing the same issue

TempusFugit wrote: ↑

Thu Jun 20, 2024 2:10 pm

Have you found a solution by any chance? I'm facing the same issue

Have YOU maybe found a solution? Seems like no one's responding...

No, I am still strugling. I do not understand, why all documentation states, that ST7789 and LVGL should go together easily with ESP32, when it is so difficult to get to work. No online examples work, most of them will not even compile, the documentation is incomplete. It seems like a mess of new libraries, old drivers, strange files to include or not to include, and a more or less undocumentet implementation via the menuconfig.

I consider myselv relatively skilled in ESP32, and have done some big project, with a lot of selv-implemented drivers and hardware. But this is simply over my head. I used countless hours, getting nowhere.

Do anybody have an example of a simple HELLO WORLD, that works on a ST7789, using the built in LVGL library?
I will give a beer for a working example.....

Hardware used: ESP32-S3-N16R8V
Platform: ESP-IDF
Editor: VSCODE with PlatformIO plugin

I would like to avoid any Arduino libraries, and not to use Arduino platform. I switched to EDP-IDF some years back, and I feel I have a lot more control over the hardware, using ESP-IDF.

My conclusion is, until proven otherwise, that ESP-IDF v5.2.1, LVGL 9.2.0 and LVGL_ESP32_DRIVERS is not compatible. Somewhere between ESP-IDF v4, LVGL 8 and now, things got broken, and nobody picked up the problem.

Whats the alternative? I have a nice ST7789 that i would like to get up running.

I dont know about v5.2.1, but it works nicely with v5.4/master (or maybe only lvgl 9.1, w/o esp_lvgl_port).

You didnt say what version of esp_lvgl_port you are using.

have you tried the "generic mipi" library? im trying to achieve the same result but with a st7735 and am facing exactly the same errors as you (latest lvgl version and latest espidf). i also was unable to find anything... the only thing i could find was that the generic mipi library should in theory work for both of us. i havent tried it yet, if anyone gets it running with the mipi stuff, please let us know!!

vinayak42 wrote: ↑

Fri Nov 08, 2024 4:27 am

have you tried the "generic mipi" library? im trying to achieve the same result but with a st7735 and am facing exactly the same errors as you (latest lvgl version and latest espidf). i also was unable to find anything... the only thing i could find was that the generic mipi library should in theory work for both of us. i havent tried it yet, if anyone gets it running with the mipi stuff, please let us know!!

Well, yes, i can run it with mipi dsi display, but it is P4 ev board, so the mipi driver may be tested only with it.

Can you share more info about your display? Maybe link to it?

chegewara wrote: ↑

Fri Nov 08, 2024 7:07 am

vinayak42 wrote: ↑

Fri Nov 08, 2024 4:27 am

have you tried the "generic mipi" library? im trying to achieve the same result but with a st7735 and am facing exactly the same errors as you (latest lvgl version and latest espidf). i also was unable to find anything... the only thing i could find was that the generic mipi library should in theory work for both of us. i havent tried it yet, if anyone gets it running with the mipi stuff, please let us know!!

Well, yes, i can run it with mipi dsi display, but it is P4 ev board, so the mipi driver may be tested only with it.

Can you share more info about your display? Maybe link to it?

hello chegewara,
i was looking at the 8.4 and the latest (9.3) versions and i realized that version 9.0 had introduced some significant changes. A few of them are:

• lv_disp_... is renamed to lv_display_...
• lv_disp_drv_t and lv_disp_draw_buf_t was removed
• to create a display and set it up:

  Code: Select all

  lv_display_t * disp = lv_display_create(hor_res, ver_res)
  lv_display_set_flush_cb(disp, flush_cb);
  lv_display_set_buffers(disp, buf1, buf2, buf_size_in_bytes, mode);
  

this is the reason many users are facing the "lv_disp_drv_t not found" errors.
The OP needs to modify their code in accordance with the changes mentioned in the changelog.
Basically codes created using v8.x will not be compatible with v9.x although there is the lv_api_map.h file which will handle some of the porting issues.