The examples shown in the widget documentation live here. The fastest way to add one is to copy an existing example next to the one you're adding and adjust it — the surrounding files already follow every convention.

• XML (preferred) — lv_example_<module>_<feature>.xml in its own <module>/<feature>/ folder. Use for anything declarative: layout, styling, properties, data binding. The C examples are generated from it, see below.
• C-only — lv_example_<module>_<feature>.c directly in the <module>/ folder. Use only when the point is imperative C that XML can't express (event callbacks, animations, draw events), or a feature XML doesn't support yet.

Most widgets need many XML examples and zero or one C-only example.

• XML: widgets/arc/lv_example_arc_set_angles.xml
• XML with data binding: widgets/slider/lv_example_slider_bind_value.xml
• C-only: widgets/arc/lv_example_arc_event.c

You write .xml; a script produces the shipped .c. Never hand-edit a generated .c — your changes will be overwritten.

python scripts/generate_examples.py [path ...]   # all examples if no path

Run it after every new or edited XML, then build to confirm it compiles. The script auto-runs scripts/code-format.py examples at the end so every generated .c ships astyle-formatted, and then wipes all .c/.h files from examples/xml_project/ (the CLI's project scaffolding) so they can't collide with the host project's source globbing.

The generator drives the LVGL Pro editor CLI (lved-cli.js), which ships with the LVGL Pro editor — see https://lvgl.io/docs/pro. The script picks it up from your PATH, or point at it explicitly:

python scripts/generate_examples.py --cli /path/to/lved-cli.js [path ...]

• Fit 320×240 — every example runs in that target (see xml_project/project.xml). Size widgets to fit.
• Reuse shared resources — subjects, consts, styles and images come from xml_project/globals.xml. Don't invent per-example subjects; add to globals.xml only if nothing fits.
• One example = one feature. Show a meaningful variation, not defaults.
• Each example is surfaced in the docs with <LvglExample>.

Every XML example opens with a comment block directly above <screen>, plus one in-view hint. Keep the layers distinct — never repeat a sentence:

• @title — short, capitalized; mirrors the on-screen label. No "XML".
• @brief — one sentence, less than 80 chars, ending with a period.
• Description — 2–3 sentences after @brief: name the specific attributes/values that vary and why it's interesting. Self-contained (readable without the doc page).
• 💡 hint — first child of <view>: imperative and specific about what to do and what visibly changes ("Drag each arc; lower change_rate lags behind"), not a vague "Adjust the arc".

The XML format and the editor are documented at https://lvgl.io/docs/pro. For the in-tree conventions, the best reference is the existing examples — match the file you copied.