Help needed - adding lvgl as component - compile error :(

[guoxiaotian]

Hello all,
I am very new to esp-idf and I am struggle to get a simple project to compile
My goal is to add lvgl and use it with my IL9488 based 3.9" TFT. I have tested wiring with Lovyangfx it it works fine.

so here is what I did

1. create project
$> idf.py create-project -p . lvgl_test

2. add component
$> idf.py add-dependency lvgl_esp32_drivers
This adds a dependency in idf_component.yml:

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espressif/lvgl_esp32_drivers: "*"

but seems idf's component manager are not able to resolve this dependency. I had to change it to

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lvgl/lvgl_esp32_drivers: "==0.0.3"

which fares better, meaning idf.py build command actually pull down the source and its own dependency : lvgl.

3. idf.py menuconfig
menuconfig now has 2 additional top level config entries

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 LVGL ESP Drivers  --->
 LVGL configuration  --->

so I went into the driver section and configured proper driver and pin settings.

Now when I try to build, I get

bunch of compilation errors, one if them is

struct "<unnamed>" has no field "bit_num"

it just seems like the version of lvgl pulled is not compatible with esp-idf as the struct is defined by esp-idf and it has not such field.

the whole component registry thing feels a little brittle, I first tried to use it from VS Code and the install button only works for some components.

I'd really appreciate it if someone could help me to unstuck. Thanks in advance!

[gtjoseph]

The versions of lvgl and lvgl_esp32_driver are indeed mismatched in the components manager. The best way to get started is to clone the lv_port_esp32 project which has synchronized lvgl and lvgl_esp32_driver components and will build without any fiddling.

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git clone --recursive https://github.com/lvgl/lv_port_esp32

In the lv_port_esp32/components directory, you'll find both lvgl and lvgl_esp32_driver components which you can copy or link to your own project's components directory. The lvgl version in this case is 7.10.1.

This will at least get you started. I don't think there's an lvgl_esp32_driver that works correctly with lvgl v8+ yet.

[chegewara]

There is 2 lvgl components "supported" by espressif:
https://components.espressif.com/search/lvgl

and there is also third one in here:
https://github.com/espressif/esp-iot-so ... i/lvgl_gui

I have no idea why, also i cant tell which is the easiest to use.