Hermann Björgvin HaraldssonandClaude Opus 4.7
13cc4231a0
Brand consistency: the device now advertises as "Clawdmeter". Updated the three functional spots that must agree for discovery-by-name to work — ble.cpp DEVICE_NAME (advertised) and both daemons' DEVICE_NAME (scan match) — plus the README/CLAUDE.md/install-script references (and fixed the stray "Claudemeter" typo in the README). Note: hosts cache the GATT name, so an already-paired device keeps showing the old name until removed/re-paired (bluetoothctl remove <mac>). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
147 lines
13 KiB
Markdown
147 lines
13 KiB
Markdown
# Project context
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ESP32-S3 firmware for a desk-side Claude Code usage monitor. Each supported
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board lives in its own `firmware/src/boards/<name>/` folder and is selected
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via PlatformIO's `build_src_filter`. Adding a board means dropping in a new
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folder + a new `[env:...]` block — `main.cpp`, `ui.cpp`, and `splash.cpp`
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never see board-specific code. See [`docs/porting/adding-a-board.md`](docs/porting/adding-a-board.md).
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Two reference ports today:
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- `boards/waveshare_amoled_216/` — original Waveshare ESP32-S3-Touch-AMOLED-2.16 (CO5300, 480×480 square, CST9220 touch, IMU rotation). Build env: `waveshare_amoled_216`.
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- `boards/waveshare_amoled_18/` — Waveshare ESP32-S3-Touch-AMOLED-1.8 (SH8601, 368×448 portrait, FT3168 touch, XCA9554 IO expander). Build env: `waveshare_amoled_18`.
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The shared code calls a small HAL (`firmware/src/hal/`) that each board implements: display, touch, input, power, IMU. Optional features are guarded by `BoardCaps` (runtime) and `BOARD_HAS_*` (compile-time) rather than `#ifdef BOARD_*`.
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Connects to a host daemon over BLE; daemon polls Anthropic API for usage data. This file is for future Claude Code sessions to bootstrap quickly. Read this first.
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## Hardware (critical pins)
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### AMOLED-2.16 (original)
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- Display: **CO5300** AMOLED via QSPI (CS=12, SCLK=38, SDIO0..3=4..7, RST=2)
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- Touch: **CST9220** via I2C (SDA=15, SCL=14, INT=11, addr=0x5A)
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- PMU: **AXP2101** on same I2C bus (addr=0x34) — battery, USB VBUS, PWR button IRQ
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- IMU: **QMI8658** on same I2C bus (addr=0x6B) — accelerometer for auto-rotation
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- Buttons: GPIO 0 (left → Space/voice-mode), GPIO 18 (right → Shift+Tab/mode-toggle), AXP PKEY (middle → cycle screens; on splash → cycle animations)
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### AMOLED-1.8 (newer port)
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- Display: **SH8601** AMOLED via QSPI (CS=12, **SCLK=11** ← different!, SDIO0..3=4..7, RST routed via XCA9554 EXIO1)
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- Touch: **FT3168** via I2C (SDA=15, SCL=14, INT=21, addr=0x38). Driven by minimal inline reader in `main.cpp` (FocalTech standard register layout — avoids vendoring the GPLv3 `Arduino_DriveBus` library).
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- PMU: AXP2101 @ 0x34 (same chip as 2.16 — `XPowersLib` reused; battery is an optional kit add-on but PMU + charging circuitry are populated)
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- IMU: QMI8658 @ 0x6B (same chip — initialized for I2C bus health, rotation logic disabled)
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- IO expander: **XCA9554 / PCA9554** @ I2C 0x20. Gates LCD_RST, TP_RST, audio amp enable, and reads the PWR button. **`io_expander_init()` MUST run before `gfx->begin()` or `ft3168_init()`** — otherwise display/touch stay in reset and silently fail. PWR button is on EXIO4, active HIGH (verified empirically with the deleted `iox` serial debug command).
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- Orientation: **fixed at 0°**. IMU auto-rotation is disabled; `rotate_strip()` / `handle_rotation_change()` are excluded via `#ifndef BOARD_AMOLED_18`.
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- Buttons: GPIO 0 (BOOT → Space/voice-mode), XCA9554 EXIO4 (PWR → cycle screens; on splash → cycle animations). **No third button** (GPIO 18 button doesn't exist on this board).
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## Architecture
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```text
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firmware/src/
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hal/ — board-agnostic interfaces shared code calls into
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board_caps.h — runtime BoardCaps struct (W, H, button_count, has_* flags)
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display_hal.h — init / begin / set_brightness / draw_bitmap / tick / round_area
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touch_hal.h — init / read(&x, &y, &pressed)
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input_hal.h — init / is_held(PRIMARY|SECONDARY)
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power_hal.h — init / tick / battery_pct / is_charging / pwr_pressed (edge)
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imu_hal.h — init / tick / rotation_quadrant
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boards/
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waveshare_amoled_216/ — CO5300 + CST9220 + AXP PKEY + QMI8658 rotation
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waveshare_amoled_18/ — SH8601 + FT3168 + AXP + XCA9554 (PWR via EXIO4), no rotation
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template/ — copy this to bootstrap a new port
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main.cpp — setup() + loop(): HAL calls only, zero #ifdef BOARD_*
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ui.{h,cpp} — 3-screen UI (splash, usage, bluetooth). compute_layout() picks fonts/positions from board_caps() (responsive — current breakpoint: H >= 460 → large, else compact)
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splash.{h,cpp} — 20×20 pixel-art engine. CELL = min(W,H)/20, centered.
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ble.{h,cpp} — NimBLE peripheral: custom data service + HID keyboard
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data.h — UsageData struct
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icons.h — icon arrays. Battery (5×) are RGB565A8 with alpha; rest are raw RGB565.
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logo.h — 80×80 RGB565 logo
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font_*.c — pre-compiled LVGL 9 bitmap fonts (Tiempos 56/34, Styrene 48/28/24/20/16/14/12, Mono 32/18)
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splash_animations.h — generated, do not hand-edit
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docs/porting/ — adding-a-board.md, hal-contract.md, capability-flags.md
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```
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Each board folder contains: `board.h` (pins, I2C addresses, `BOARD_HAS_*` flags),
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`board_init.cpp` (Wire.begin + any IO expander), `display.cpp`, `touch.cpp`,
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`input.cpp`, `power.cpp`, `imu.cpp`, `caps.cpp` (the `BoardCaps` instance), plus
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any board-private hardware drivers (e.g. `io_expander.{h,cpp}` on AMOLED-1.8).
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PlatformIO's `build_src_filter` includes shared code + one board's folder per env.
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## Build / flash
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```bash
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pio run -d firmware -e waveshare_amoled_216 # build 2.16 (default original)
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pio run -d firmware -e waveshare_amoled_18 # build 1.8 (new port)
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pio run -d firmware -e waveshare_amoled_18 -t upload --upload-port /dev/cu.usbmodem101 # flash 1.8 on macOS
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pio run -d firmware -e waveshare_amoled_216 -t upload --upload-port /dev/ttyACM0 # flash 2.16 on Linux
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```
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If `pio` isn't on PATH: try `~/.platformio/penv/bin/pio` (Linux/macOS pio install) or `brew install platformio` on macOS.
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Device path differs by OS: `/dev/cu.usbmodem*` on macOS, `/dev/ttyACM0` on Linux. Both expose the ESP32-S3 native USB-JTAG (no boot-mode dance needed).
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## QA your own UI changes — don't ask the user
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The firmware ships a `screenshot` serial command that dumps the LVGL framebuffer. `./screenshot.sh out.png [port]` captures a PNG sized to the active display (480×480 or 368×448). **Use this on every UI iteration** — Read the PNG with the Read tool, verify the change visually, iterate. Script auto-picks the macOS/Linux default port and falls back to pio's bundled Python if pyserial isn't on the system Python.
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The boot screen is `SCREEN_SPLASH` and only advances on a physical button press, so a fresh flash will sit on the splash. To screenshot the screen you're actually editing without asking the user to press a button, **temporarily change the default boot screen** in `main.cpp` (search for `ui_show_screen(SCREEN_SPLASH);`) to `SCREEN_USAGE` / `SCREEN_CONTROLLER` / `SCREEN_BLUETOOTH`, do your iteration, then revert before committing.
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## Critical gotchas
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1. **CO5300 cannot rotate.** Its MADCTL only supports axis flips, not column/row exchange. Rotation is done by **CPU pixel remapping inside `display_hal_draw_bitmap`** in `boards/waveshare_amoled_216/display.cpp`. We use **PARTIAL render mode with strip rotation** (small 480×40 strips, fast). On rotation change → AMOLED brightness flash → force redraw (handled inside `display_hal_tick`).
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2. **OPI PSRAM** required: `board_build.arduino.memory_type = qio_opi` in platformio.ini. Without this, `MALLOC_CAP_SPIRAM` returns NULL and the screen is black.
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3. **pioarduino platform required.** GFX Library for Arduino needs Arduino Core 3.x (`esp32-hal-periman.h`), not the 2.x that standard `espressif32` ships. We pin `pioarduino/platform-espressif32` 55.03.38-1.
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4. **LVGL 9 font patching.** `lv_font_conv` outputs LVGL 8 format. Must remove `#if LVGL_VERSION_MAJOR >= 8` guards, drop `.cache` field, add `.release_glyph`, `.kerning`, `.static_bitmap`, `.fallback`, `.user_data`. Without patching, fonts render invisible.
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5. **Touch reading is centralized inside each board's `touch.cpp`.** The HAL `touch_hal_read()` is called once per loop from `my_touch_cb`; the board's implementation owns its latched `touch_pressed/x/y` state. Don't call the underlying controller from anywhere else — CST9220's `getPoint()` etc. do a full I2C transaction and concurrent callers consume each other's data.
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6. **Even-aligned flush regions.** `display_hal_round_area` (called from `rounder_cb`) is what each board uses to enforce this. Required on CO5300, harmless on SH8601.
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7. **Touch axis swap/mirror is per-board.** The 2.16's CST9220 needs `setSwapXY(true)` + `setMirrorXY(true, false)` — applied inside `boards/waveshare_amoled_216/touch.cpp::touch_hal_init()`. New ports apply their own.
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8. **LVGL RGB565A8 is planar.** `w*h` RGB565 pixels followed by `w*h` alpha bytes; `data_size = w*h*3`, `stride = w*2`. Use `init_icon_dsc_rgb565a8()` for icons that overlap non-uniform backgrounds (e.g. battery over splash). Lucide source PNGs are black-on-transparent — converter must tint to white or icons render invisible. See `tools/png_to_lvgl.js`.
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9. **Per-board pre-init is `board_init()`.** Each board's `board_init.cpp` brings up `Wire` and any reset-gating IO expander BEFORE `display_hal_init()`. Skipping the IO expander release on AMOLED-1.8 leaves SH8601 + FT3168 in reset and they silently fail to probe.
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10. **No `#ifdef BOARD_*` in shared code.** The whole point of the refactor — if you're about to add one, you probably want a `BoardCaps` field or a per-board file instead. See `docs/porting/capability-flags.md`.
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## Icons
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`tools/png_to_lvgl.js <input.png> <symbol> [W_MACRO] [H_MACRO] [--tint=RRGGBB | --no-tint]` converts an alpha PNG to RGB565A8. Default tint is white (`0xFFFFFF`) — necessary for Lucide PNGs. Splice output into `firmware/src/icons.h` and use `init_icon_dsc_rgb565a8()` in ui.cpp. Currently only the 5 battery icons use this format; the rest are still raw RGB565 baked over the panel background, fine because they live inside opaque zones.
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## Splash animations
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13 × 20×20 pixel-art creature animations sourced from
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[claudepix.vercel.app](https://claudepix.vercel.app). Pipeline:
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```bash
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node tools/scrape_claudepix.js # → tools/claudepix_data/*.json
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node tools/convert_to_c.js # → firmware/src/splash_animations.h
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```
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Each animation has a per-animation 10-color RGB565 palette. Cell values 0..9 index it. Default boot screen.
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## User profile / preferences
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See `~/.claude/projects/.../memory/` files for persistent context (user is an embedded-beginner senior dev, brand-conscious, prefers iterative UI refinement, dislikes me authoring my own art when third-party assets are intended). Always read those memory files at session start.
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## Recent session highlights
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- **Device-abstraction refactor (2026-05-18).** All board-conditional code moved out of shared files into `boards/<name>/` and behind a HAL in `hal/`. ~30 `#ifdef BOARD_*` blocks went to zero. UI is responsive via `compute_layout()` driven by `board_caps()`. New ports add a folder + a PlatformIO env — no shared file edits.
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- Added second board port: Waveshare AMOLED-1.8 (368×448 portrait, SH8601, FT3168, XCA9554 IO expander).
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- Migrated from Panlee SC01 Plus (480×320 IPS) to Waveshare 2.16" AMOLED (480×480 square). Full hardware/library swap.
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- Added IMU auto-rotation, battery indicator, USB-state-aware screen switching.
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- Added splash screen with scraped pixel-art animations and 3-button physical input layout.
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- Fonts and icons re-scaled ~1.9× for the higher-DPI panel.
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- All UI margins widened to 20px to clear the rounded display corners.
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- Battery icons converted to RGB565A8 alpha so they blend cleanly over the splash animations.
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## Daemon / host side
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Bash daemon (`daemon/claude-usage-daemon.sh`) reads OAuth token, polls Anthropic API, sends JSON over BLE GATT. Run with `systemctl --user start claude-usage-daemon`. The unit file's `ExecStart` is the absolute path to the script — repoint it when switching between the worktree and the main checkout.
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**Discovery & resilience:**
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- Connects by name (`"Clawdmeter"`) on first run, caches resolved MAC at `~/.config/claude-usage-monitor/ble-address`. ESP32 BLE addresses are factory-burned per-chip, so swapping any board invalidates the cache.
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- On connect failure: cache is dropped AND device is removed from bluez (`bluetoothctl remove`) so the next scan won't re-pick a dead MAC. Multi-candidate scans pick `head -1` and let the failure cycle converge.
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- `POLL_INTERVAL=60`, `TICK=5`. Inner loop wakes every 5s to detect disconnects fast; polls Anthropic when 60s elapsed OR when ESP fires a refresh request.
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**GATT characteristics on service `4c41555a-...0001`:**
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- `...0002` RX — daemon writes JSON usage payload here.
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- `...0003` TX — firmware notifies ack/nack (daemon doesn't subscribe).
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- `...0004` REQ — firmware fires `0x01` notify in `onSubscribe` if `has_received_data` is false. Daemon subscribes via `setsid bash -c "stdbuf -oL dbus-monitor … | awk …"`; awk drops a flag file the inner loop picks up. See the `feedback_dbus_monitor_pipe` memory for the three subtle gotchas (pipe buffering, busctl-exits race, `wait` blocking on pipeline jobs).
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