build: use .defaults as a way to configure lvgl instead of lv_conf.h

[AndreCostaaa]

This is a proposal to not use lv_conf.h in this repository and instead use lv_conf.defaults

lv_conf.h is generated at build time using Cmake from lv_conf.defaults

---

Summary by cubic

Generate lv_conf.h at build time from lv_conf.defaults via CMake to simplify LVGL configuration and remove the tracked header. This reduces config drift and makes per-build tweaks easier.

• Refactors

  • Generate lv_conf.h using lvgl/scripts/generate_lv_conf.py with lv_conf_template.h and lv_conf.defaults.
  • Configure CMake to place the generated lv_conf.h in the build directory and fail fast on errors.
  • Remove the committed lv_conf.h from the repo.
  • Refresh lv_conf.defaults for our Linux FBDEV + EVDEV setup, enabling vector graphics, TTF, common image decoders, logging, and selected demos; adjust render mode and buffer settings.

• Migration

  • Edit lv_conf.defaults to change LVGL settings; do not add lv_conf.h back.
  • Ensure Python 3 is available during configure/build.

[cubic-dev-ai]

1 issue found across 3 files

Prompt for AI agents (all 1 issues)

Understand the root cause of the following 1 issues and fix them.


<file name="CMakeLists.txt">

<violation number="1" location="CMakeLists.txt:29">
LV_CONF_DEFAULTS_PATH points to lv_conf_3d.defaults, but that file is absent from the repo, so configure_file will fail and the build cannot proceed.</violation>
</file>

_{React with 👍 or 👎 to teach cubic. Mention @cubic-dev-ai to give feedback, ask questions, or re-run the review.}

[cubic-dev-ai]

LV_CONF_DEFAULTS_PATH points to lv_conf_3d.defaults, but that file is absent from the repo, so configure_file will fail and the build cannot proceed.

Prompt for AI agents

Address the following comment on CMakeLists.txt at line 29:

<comment>LV_CONF_DEFAULTS_PATH points to lv_conf_3d.defaults, but that file is absent from the repo, so configure_file will fail and the build cannot proceed.</comment>

<file context>
@@ -21,6 +21,36 @@ set(CMAKE_C_FLAGS &quot;${CMAKE_C_FLAGS} -Wall -Wextra -Wpedantic&quot;)
+    CACHE PATH &quot;path to lv_conf.h&quot; FORCE)
+
+set(LVGL_TEMPLATE_PATH &quot;${CMAKE_SOURCE_DIR}/lvgl/lv_conf_template.h&quot;)
+set(LV_CONF_DEFAULTS_PATH &quot;${CMAKE_SOURCE_DIR}/lv_conf_3d.defaults&quot;)
+set(GENERATE_SCRIPT_PATH &quot;${CMAKE_SOURCE_DIR}/lvgl/scripts/generate_lv_conf.py&quot;)
+
</file context>

Suggested change

	set(LV_CONF_DEFAULTS_PATH "${CMAKE_SOURCE_DIR}/lv_conf_3d.defaults")
	set(LV_CONF_DEFAULTS_PATH "${CMAKE_SOURCE_DIR}/lv_conf.defaults")

✅ Addressed in 0154606