# LVGL + GIF Reproduction Guide (ESP-IDF Project 1:1 Porting)

This document tracks how to reproduce the `LVGL + ST7789V + GIF` runtime path in this repository, and records what is already implemented versus what is still missing.

All claims should be traceable to file:line evidence. If evidence is not available in the repository, mark it as `UNKNOWN`.

## Section 0: Current Implementation Status (2026-03-12)

This section reflects the actual state of the repository and takes precedence over older assumptions.

### 0.1 Scope approved in this round

- Introduce LVGL using `lvgl/lvgl = 9.2.0`.
- Use a single ST7789V panel.
- Do not use shared SPI for multiple LCD panels.
- Follow LCD GPIO mapping from `docs/gpio-map.md`.
- Keep layered architecture unchanged: `app_composition -> control_plane -> domain -> platform`.

### 0.2 Completed progress

1. LVGL dependency was added and locked to `9.2.0`.
   Evidence: `main/idf_component.yml:3`, `dependencies.lock:64`, `dependencies.lock:70`.
2. LCD runtime was migrated from JPEG demo rendering to `esp_lcd + lvgl`.
   Evidence: `components/platform/CMakeLists.txt:13`, `components/platform/CMakeLists.txt:49`, `components/platform/CMakeLists.txt:58`, `components/platform/src/lcd.c:367`, `components/platform/src/lcd.c:401`, `components/platform/src/lcd.c:429`, `components/platform/src/lcd.c:543`.
3. Single ST7789V panel path is active.
   Evidence: `components/platform/src/lcd.c:2`, `components/platform/src/lcd.c:401`, `components/platform/src/lcd.c:496`.
4. LCD pin mapping matches the GPIO map document.
   Evidence: `docs/gpio-map.md:16`, `docs/gpio-map.md:18`, `docs/gpio-map.md:19`, `docs/gpio-map.md:20`, `docs/gpio-map.md:24`, `docs/gpio-map.md:26`, `components/platform/src/lcd.c:35`, `components/platform/src/lcd.c:36`, `components/platform/src/lcd.c:37`, `components/platform/src/lcd.c:38`, `components/platform/src/lcd.c:39`, `components/platform/src/lcd.c:40`, `sdkconfig.defaults:81`.
5. Build passed after integration.
   Evidence: local run `idf.py fullclean && idf.py build` completed successfully.
6. No runtime `gc9a01` dependency remains under `components` and `main`.
   Evidence: `rg -n "gc9a01|GC9A01" components main` returned no matches.

### 0.3 Still missing

1. GIF business pipeline is not implemented yet in the current codebase.
   Missing modules include `components/gifdisplay/*`, GIF package loading, preload, and runtime switching.
2. Emotion-driven GIF switching path is not implemented (`components/emotion/*` is absent).
3. The current LVGL UI is a baseline default screen, not GIF playback UI.
4. Device-side GIF runtime logs are not available yet (`Switching gifs...` class logs are not present in runtime code).

### 0.4 Differences vs the original baseline description

1. Panel topology:
   Original baseline: dual GC9A01.
   Current implementation: single ST7789V.
2. LVGL version:
   Original baseline: `9.4.0`.
   Current implementation: `9.2.0` (explicitly requested in this round).
3. Display stack:
   Original baseline references an older code layout and line map.
   Current repository uses the layered runtime path and a rewritten `components/platform/src/lcd.c` implementation.
4. GIF status:
   Original baseline assumes full GIF chain exists.
   Current repository does not yet include GIF runtime components.

### 0.5 Environment note

- `AGENTS.md` requires ESP-IDF `5.5.2` setup instructions.
  Evidence: `AGENTS.md:31`.
- The actual local verification in this round used ESP-IDF `5.5.1` because that environment path exists locally.
  Evidence: `dependencies.lock:63`.

## Section A: Reality Check + Runtime Call Graph (Current Repository)

### A.1 Reality Check

1. LVGL runtime path is now present in production LCD code (not only a test utility).
   Evidence: `components/platform/src/lcd.c:415`, `components/platform/src/lcd.c:429`, `components/platform/src/lcd.c:479`, `components/platform/src/lcd.c:543`.
2. GIF playback path is not present in runtime code.
   Evidence: `rg -n "gifdisplay|lv_gif|gifpack" components main` has no runtime hits.
3. `app_main` still starts LCD through layered interfaces.
   Evidence: `main/main.c:285`, `components/app_composition/src/app_composition_runtime_support.c:65`, `components/control_plane/src/control_plane_runtime_support.c:39`, `components/domain/src/domain_runtime_support.c:39`, `components/platform/src/platform_runtime_support.c:176`.

### A.2 Runtime Call Graph (`app_main` to panel flush)

Current startup chain:

`app_main`
-> `app_composition_init_lcd_device`
-> `control_plane_init_lcd_device`
-> `domain_init_lcd_device`
-> `platform_init_lcd_device`
-> `platform_runtime_init_lcd_device`
-> `lcd_init_device`
-> `lcd_panel_init`
-> `esp_lcd_new_panel_st7789`
-> LVGL display setup
-> `lv_timer_handler` loop
-> `lvgl_flush_cb`
-> `esp_lcd_panel_draw_bitmap`

Evidence:
- `main/main.c:285`
- `components/app_composition/src/app_composition_runtime_support.c:65`
- `components/control_plane/src/control_plane_runtime_support.c:39`
- `components/domain/src/domain_runtime_support.c:39`
- `components/platform/src/platform_runtime_support.c:176`
- `components/platform/src/lcd.c:479`
- `components/platform/src/lcd.c:367`
- `components/platform/src/lcd.c:401`
- `components/platform/src/lcd.c:415`
- `components/platform/src/lcd.c:543`
- `components/platform/src/lcd.c:340`
- `components/platform/src/lcd.c:343`

## Section B: LVGL Stack Details (Current)

### B.1 Versions and dependencies

- IDF in lock file: `5.5.1`.
  Evidence: `dependencies.lock:63`.
- LVGL dependency: `lvgl/lvgl 9.2.0`.
  Evidence: `main/idf_component.yml:3`, `dependencies.lock:64`, `dependencies.lock:70`.
- Platform component dependencies include `esp_lcd`, `esp_timer`, `lvgl`.
  Evidence: `components/platform/CMakeLists.txt:49`, `components/platform/CMakeLists.txt:52`, `components/platform/CMakeLists.txt:58`.

### B.2 Display driver stack (single ST7789V)

- SPI host: `SPI2_HOST`.
  Evidence: `components/platform/src/lcd.c:30`.
- Panel create API: `esp_lcd_new_panel_st7789`.
  Evidence: `components/platform/src/lcd.c:401`.
- Flush callback: `lvgl_flush_cb` -> `esp_lcd_panel_draw_bitmap`.
  Evidence: `components/platform/src/lcd.c:340`, `components/platform/src/lcd.c:343`.
- Flush done callback: `on_color_trans_done` -> `lv_display_flush_ready`.
  Evidence: `components/platform/src/lcd.c:327`, `components/platform/src/lcd.c:335`, `components/platform/src/lcd.c:434`, `components/platform/src/lcd.c:437`.
- Tick source: `esp_timer` calling `lv_tick_inc` every 2 ms.
  Evidence: `components/platform/src/lcd.c:89`, `components/platform/src/lcd.c:174`, `components/platform/src/lcd.c:177`, `components/platform/src/lcd.c:449`.
- LVGL loop: `lv_timer_handler` in blocking task loop.
  Evidence: `components/platform/src/lcd.c:540`, `components/platform/src/lcd.c:543`.
- Locking: recursive mutex around LVGL operations.
  Evidence: `components/platform/src/lcd.c:159`, `components/platform/src/lcd.c:164`, `components/platform/src/lcd.c:167`, `components/platform/src/lcd.c:170`, `components/platform/src/lcd.c:485`.

### B.3 Key LCD/LVGL parameters

- Resolution: `320x240`.
  Evidence: `components/platform/src/lcd.c:86`, `components/platform/src/lcd.c:87`.
- Draw buffer lines: `20`.
  Evidence: `components/platform/src/lcd.c:88`.
- Color format: `RGB565`.
  Evidence: `components/platform/src/lcd.c:429`.
- SPI clock: `10 MHz`.
  Evidence: `components/platform/src/lcd.c:31`.

<!-- ### B.4 GPIO mapping

Configured pins in code:
- `MOSI=17`, `SCLK=18`, `CS=16`, `DC=7`, `RST=3`, `BL=9`.
  Evidence: `components/platform/src/lcd.c:35`, `components/platform/src/lcd.c:36`, `components/platform/src/lcd.c:37`, `components/platform/src/lcd.c:38`, `components/platform/src/lcd.c:39`, `components/platform/src/lcd.c:40`, `sdkconfig.defaults:81`.

Reference mapping document:
- `LCD_CS=IO6`, `LCD_DC=IO7`, `LCD_SPI_MOSI=IO17`, `LCD_SPI_SCLK=IO18`, `LCD_RST=IO3`, `LCD_BACKLIGHT_EN=IO9`.
  Evidence: `docs/gpio-map.md:16`, `docs/gpio-map.md:18`, `docs/gpio-map.md:19`, `docs/gpio-map.md:20`, `docs/gpio-map.md:24`, `docs/gpio-map.md:26`. -->

## Section C: GIF Pipeline Status

### C.1 Current status

- `UNKNOWN` as implemented feature in this repository branch: full GIF runtime pipeline.
- No `gifdisplay` component exists in current source tree.
- No `emotion` component exists in current source tree.

### C.2 Required future implementation (not done yet)

1. Add GIF runtime owner component (recommended: `components/gifdisplay`).
2. Add GIF asset packaging and partition-read path.
3. Add GIF widget playback path in LVGL (`lv_gif_set_src` or equivalent strategy).
4. Add business trigger path from runtime state to GIF switching.
5. Add startup preload / timeout / rollback strategy consistent with target behavior.

## Section D: Layering and Dependency Compliance

Current layered dependency chain remains valid:
- `app_composition` depends on `control_plane`.
  Evidence: `components/app_composition/CMakeLists.txt:11`.
- `control_plane` depends on `domain`.
  Evidence: `components/control_plane/CMakeLists.txt:13`.
- `domain` depends on `platform`.
  Evidence: `components/domain/CMakeLists.txt:13`.
- `platform` owns runtime LCD integration directly (no separate `lcd` component dependency).
  Evidence: `components/platform/CMakeLists.txt:13`, `components/platform/src/platform_runtime_support.c:11`, `components/platform/src/platform_runtime_support.c:176`.

## Section E: Verification Matrix

### E.1 Completed in this round

| Check | Command | Result |
|---|---|---|
| Build | `idf.py fullclean && idf.py build` | Passed |
| LVGL dependency | lockfile inspection | `lvgl/lvgl = 9.2.0` |
| GC9A01 runtime residue | `rg -n "gc9a01|GC9A01" components main` | No matches |

### E.2 Pending for next round

| Check | Command | Expected |
|---|---|---|
| Device runtime LVGL stability | `idf.py -p <PORT> flash monitor` | No frequent flush/panel failures |
| GIF startup and switching | Same monitor run with GIF triggers | GIF load and switching logs present |
| Long-run behavior | Continuous run test | Stable memory and frame updates |

## Section F: Risks and Open Items

1. The guide originally describes a complete GIF stack, but the current repository does not include those modules yet.
2. The current implementation is LVGL-base-only; GIF behavior parity is still pending.
3. Environment parity risk exists if strict ESP-IDF `5.5.2` compliance is mandatory.
4. Performance targets (FPS/CPU/memory thresholds) are not yet defined in code-level acceptance criteria.

## Section G: Minimal File Set (Current State)

Implemented in this round:
- `main/idf_component.yml`
- `dependencies.lock`
- `components/platform/CMakeLists.txt`
- `components/platform/internal/lcd.h`
- `components/platform/src/lcd.c`

Not yet implemented but required for full GIF parity:
- `components/gifdisplay/*`
- `components/emotion/*`
- GIF assets and packaging scripts