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docs(esp32): lv_conf.h is ignored (LV_CONF_SKIP) — configure LVGL via Kconfig #891

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docs(esp32): lv_conf.h is ignored (LV_CONF_SKIP) — configure LVGL via Kconfig #891

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13 changes: 13 additions & 0 deletions firmware/esp32-csi-node/README.md
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Expand Up @@ -287,6 +287,19 @@ CONFIG_WASM_MAX_MODULES=4
CONFIG_WASM_VERIFY_SIGNATURE=y
```

#### LVGL / display config gotcha (ADR-045)

This project builds the managed `lvgl/lvgl` component with **`CONFIG_LV_CONF_SKIP=y`**, so `main/lv_conf.h` is **ignored** — every LVGL option is taken from Kconfig instead. Editing `lv_conf.h` (fonts, tick, widgets, …) has **no effect**. Configure LVGL through `sdkconfig.defaults` (or `idf.py menuconfig` → *Component config → LVGL*):

```ini
# Fonts: setting LV_FONT_MONTSERRAT_* in lv_conf.h does NOTHING — use Kconfig:
CONFIG_LV_FONT_MONTSERRAT_20=y
CONFIG_LV_FONT_MONTSERRAT_36=y
CONFIG_LV_USE_BAR=y
```

The same applies to the **LVGL tick**: the display only refreshes if `lv_tick` advances, which requires either `CONFIG_LV_TICK_CUSTOM` (Kconfig) or a firmware-driven `lv_tick_inc()` — `LV_TICK_CUSTOM=1` in `lv_conf.h` is ignored. (The firmware drives the tick via an `esp_timer`.)

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## Flashing
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