diff --git a/CMakeLists.txt b/CMakeLists.txt
deleted file mode 100644
index ab209e7..0000000
--- a/CMakeLists.txt
+++ /dev/null
@@ -1,14 +0,0 @@
-cmake_minimum_required(VERSION 3.20.0)
-
-find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
-
-project(nrfwarch)
-
-target_sources(app PRIVATE
-	src/main.c
-	src/epd_drv.c
-	src/watchface.c
-	src/fonts.c
-)
-
-target_include_directories(app PRIVATE src)
diff --git a/README.md b/README.md
deleted file mode 100644
index 29bcf77..0000000
--- a/README.md
+++ /dev/null
@@ -1,178 +0,0 @@
-# nrfwarch
-
-Smartwatch firmware for the [Seeed Xiao nRF54L15 Sense](https://www.seeedstudio.com/XIAO-nRF54L15-Sense-p-6494.html) with a GDEY0154D61LT 1.54" e-ink display.
-
-Built on [Zephyr RTOS](https://docs.zephyrproject.org/) v4.0. Targets the `xiao_nrf54l15/nrf54l15/cpuapp` board. Includes a display simulator that renders the watchface on your desktop using [feh](https://feh.finalrewind.org/).
-
-## Hardware
-
-- **MCU**: Nordic nRF54L15 (ARM Cortex-M33, 128KB RAM, 1MB Flash)
-- **Board**: Seeed Xiao nRF54L15 Sense (includes LSM6DSO IMU, PDM mic)
-- **Display**: Good Display GDEY0154D61LT 1.54" e-ink, 200x200px, SSD1680 controller, SPI
-
-### E-ink wiring
-
-| Signal | Xiao Pin | Function |
-|--------|----------|----------|
-| MOSI   | D10      | SPI data out |
-| CLK    | D8       | SPI clock |
-| CS     | D1       | Chip select |
-| DC     | D3       | Data/command |
-| RST    | D0       | Hardware reset |
-| BUSY   | D5       | Busy status |
-
-## Quick start
-
-### 1. Enter dev shell
-
-```bash
-nix develop
-```
-
-### 2. Set up Zephyr SDK (first time only)
-
-Downloads Zephyr v4.0 workspace and SDK 0.17.0, patches binaries for NixOS:
-
-```bash
-nix run .#setup-sdk
-```
-
-### 3. Run the display simulator
-
-Builds and runs the watchface simulator. Time advances 1 minute per second. A feh window opens showing the e-ink output in real time. The simulator uses the same rendering code that runs on the real hardware.
-
-```bash
-nix run .#sim
-```
-
-This pipes the native_sim binary output through `sim/view.py`, which converts the framebuffer to PBM and auto-launches feh with `--auto-reload`. The output file is `/tmp/nrfwarch.pbm`.
-
-### 4. Run tests
-
-17 ztest cases covering framebuffer operations, font data, and rendering:
-
-```bash
-nix run .#test
-```
-
-### 5. Build for hardware
-
-Open the project in [nRF Connect for VS Code](https://marketplace.visualstudio.com/items?itemName=nordic-semiconductor.nrf-connect) and add the application with board target `xiao_nrf54l15/nrf54l15/cpuapp`. Or build from the command line:
-
-```bash
-west build -b xiao_nrf54l15/nrf54l15/cpuapp .
-```
-
-## Display simulation
-
-The simulator lets you develop the watchface visually without any hardware. It runs the actual Zephyr kernel and the real `watchface.c` / `fonts.c` code -- the only difference is the EPD driver writes to a file instead of SPI.
-
-How it works:
-
-1. `sim/src/epd_sim.c` implements the same API as `src/epd_drv.c`, but instead of sending SPI commands it dumps the raw framebuffer over stdout as hex, framed with `!F!` / `!E!` markers
-2. `sim/view.py` reads the hex frames from stdin, inverts the polarity (framebuffer uses 1=white, PBM uses 1=black), and writes a PBM image to `/tmp/nrfwarch.pbm`
-3. feh watches the file with `--auto-reload` and updates the display window
-
-The simulated time starts at 12:00 and advances 1 minute every 0.8 seconds. Battery decreases by 2% per simulated hour. A full 24-hour cycle runs in about 19 minutes.
-
-### Manual usage
-
-If you want to run the sim without feh or pipe the output yourself:
-
-```bash
-# Run the binary directly (outputs hex frames to stdout)
-./build-sim/zephyr/zephyr.exe
-
-# Convert a single frame to PBM manually
-./build-sim/zephyr/zephyr.exe | python3 sim/view.py
-
-# Just view the current frame
-feh /tmp/nrfwarch.pbm
-
-# Convert to PNG for sharing
-pnmtopng /tmp/nrfwarch.pbm > watchface.png
-```
-
-### Iterating on the watchface
-
-1. Edit `src/watchface.c` or modify digit shapes in `tools/gen_fonts.py`
-2. If fonts changed: `python3 tools/gen_fonts.py`
-3. Rebuild sim: `cmake -B build-sim -GNinja -DBOARD=qemu_x86 -S sim && ninja -C build-sim`
-4. Run: `./build-sim/zephyr/zephyr.exe | python3 sim/view.py`
-5. feh auto-reloads when the PBM changes
-
-## Project layout
-
-```
-src/
-  main.c           Entry point, minute-by-minute watch face loop
-  epd_drv.c/h      SSD1680 e-ink driver (SPI, full/partial refresh, deep sleep)
-  watchface.c/h    Framebuffer renderer (200x200 monochrome)
-  fonts.c/h        Bitmap fonts (24x40 digits, 8x40 colon)
-
-sim/
-  src/main.c       Simulated main loop (accelerated time, no hardware)
-  src/epd_sim.c    EPD mock - dumps framebuffer as hex over stdout
-  view.py          Reads hex frames, writes PBM, launches feh
-  CMakeLists.txt   Sim build config
-  prj.conf         Sim Kconfig
-
-boards/
-  xiao_nrf54l15_nrf54l15_cpuapp.overlay   Devicetree overlay (SPI, GPIO, I2C, BT)
-  xiao_nrf54l15_nrf54l15_cpuapp.conf      Board-specific Kconfig
-
-dts/bindings/
-  nrfwarch,epd-ctrl.yaml                  Custom binding for EPD GPIO control node
-
-tests/
-  src/main.c       17 ztest cases (framebuffer, pixels, fonts, rendering)
-  prj.conf         Test build config
-
-prj.conf           Main application config
-CMakeLists.txt     Build definition
-flake.nix          Nix flake (dev shell, setup-sdk, test, sim)
-
-tools/
-  gen_fonts.py     Font generator (run to regenerate src/fonts.*)
-```
-
-## Flake commands
-
-| Command | Description |
-|---------|-------------|
-| `nix develop` | Enter dev shell with all tools |
-| `nix run .#setup-sdk` | Download and set up Zephyr SDK + workspace |
-| `nix run .#test` | Build and run ztest suite on QEMU |
-| `nix run .#sim` | Run display simulator with feh viewer |
-
-## What works
-
-- SSD1680 e-ink driver with full refresh and partial refresh
-- Framebuffer-based watch face with time rendering (HH:MM) and battery indicator
-- Deep sleep / wake for the display
-- Display simulator with real-time feh output
-- 17 passing tests covering framebuffer operations, font data integrity, and rendering
-
-## In progress / planned
-
-- BLE Current Time Service (CTS) client for phone time sync
-- GRTC-based RTC for persistent timekeeping across deep sleep
-- Battery monitoring via ADC (channel 7, VBAT regulator)
-- LSM6DSO IMU wrist-tilt wake detection
-- System-off power management with regulator control
-- Partial refresh for minute updates (avoid full refresh flicker)
-- BLE Battery Service (BAS) and notifications
-
-## References
-
-- [Seeed Xiao nRF54L15 Wiki](https://wiki.seeedstudio.com/xiao_nrf54l15_sense_getting_started/)
-- [Zephyr RTOS Documentation](https://docs.zephyrproject.org/)
-- [Zephyr QEMU x86 Board](https://docs.zephyrproject.org/latest/boards/qemu/x86/doc/index.html)
-- [Zephyr ztest Framework](https://docs.zephyrproject.org/latest/develop/test/ztest.html)
-- [SSD1680 datasheet](https://www.good-display.com/companyfile/409.html) (GDEY0154D61LT)
-- [Sample repo: Toastee0/Seeed-Xiao-nRF54L15](https://github.com/Toastee0/Seeed-Xiao-nRF54L15)
-- [E-ink driver reference: jcontrerasf/E-ink-display-Zephyr](https://github.com/jcontrerasf/E-ink-display-Zephyr)
-
-## License
-
-Apache 2.0
diff --git a/boards/xiao_nrf54l15_nrf54l15_cpuapp.conf b/boards/xiao_nrf54l15_nrf54l15_cpuapp.conf
deleted file mode 100644
index 6c6bdcf..0000000
--- a/boards/xiao_nrf54l15_nrf54l15_cpuapp.conf
+++ /dev/null
@@ -1,8 +0,0 @@
-CONFIG_SERIAL=y
-CONFIG_UART_CONSOLE=y
-CONFIG_CONSOLE=y
-CONFIG_GPIO=y
-CONFIG_SPI=y
-CONFIG_I2C=y
-CONFIG_ADC=y
-CONFIG_ADC_ASYNC=y
diff --git a/boards/xiao_nrf54l15_nrf54l15_cpuapp.overlay b/boards/xiao_nrf54l15_nrf54l15_cpuapp.overlay
deleted file mode 100644
index 0ab5588..0000000
--- a/boards/xiao_nrf54l15_nrf54l15_cpuapp.overlay
+++ /dev/null
@@ -1,24 +0,0 @@
-/ {
-	aliases {
-		vbat-reg = &vbat_pwr;
-		sw0 = &usr_btn;
-		led0 = &led0;
-	};
-
-	epd_ctrl: epd-ctrl {
-		compatible = "nrfwarch,epd-ctrl";
-		cs-gpios   = <&xiao_d 1 GPIO_ACTIVE_LOW>;
-		dc-gpios   = <&xiao_d 3 GPIO_ACTIVE_HIGH>;
-		rst-gpios  = <&xiao_d 0 GPIO_ACTIVE_LOW>;
-		busy-gpios = <&xiao_d 5 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
-	};
-};
-
-&xiao_spi {
-	status = "okay";
-};
-
-&xiao_i2c {
-	status = "okay";
-	clock-frequency = <I2C_BITRATE_FAST>;
-};
diff --git a/developmentlog.md b/developmentlog.md
deleted file mode 100644
index cff03b2..0000000
--- a/developmentlog.md
+++ /dev/null
@@ -1,92 +0,0 @@
-# Development Log
-
-## 2026-04-25: Initial Setup
-
-### Project: nrfwarch
-Smartwatch firmware for Seeed Xiao nRF54L15 Sense with GDEY0154D61LT 1.54" e-ink display (SSD1680 controller).
-
-### Board setup
-- Ported SSD1680 e-ink driver from jcontrerasf/E-ink-display-Zephyr (nRF52840/PlatformIO) to Xiao nRF54L15 with modern Zephyr APIs
-- Created custom devicetree binding (`nrfwarch,epd-ctrl`) for EPD GPIO pins
-- VCOM command (0x2C, value 0xA5) added to init sequence
-- Partial update uses `0xCF` control byte (clock + analog + temperature, no LUT reload)
-
-### Framebuffer renderer
-- 200x200 monochrome framebuffer, 5000 bytes
-- Y-flip in `wf_set_pixel` compensates for SSD1680 data entry mode 0x01 (Y decrement): `ram_row = (199 - y)`
-- `wf_draw_glyph` draws a glyph bitmap onto the framebuffer at (dst_x, dst_y). Font data uses bit=1 for foreground (draw black), bit=0 for background (skip). Background pixels are NOT written so the framebuffer underneath is preserved.
-- Stack overflow in `epd_clear` fixed by using static buffer instead of stack allocation
-
-### Fonts
-- `tools/gen_fonts.py` generates `src/fonts.h` and `src/fonts.c` programmatically
-- Digits are 24x40px (120 bytes each), colon is 8x40px (40 bytes)
-- Digits are drawn as stroked outlines: horizontal/vertical lines + filled rectangles
-- Each digit is a seven-segment-style rendering with 2px stroke thickness and 3px margins
-- To regenerate: `python3 tools/gen_fonts.py`
-
-### EPD wiring (Xiao nRF54L15 Sense)
-| Signal | Pin | GPIO |
-|--------|-----|------|
-| MOSI   | D10 | SPI MOSI |
-| CLK    | D8  | SPI SCK |
-| CS     | D1  | xiao_d 1 |
-| DC     | D3  | xiao_d 3 |
-| RST    | D0  | xiao_d 0 |
-| BUSY   | D2  | xiao_d 2 |
-
-## 2026-04-25: Display Simulator
-
-### What was done
-- `sim/` directory with display simulator for watchface development without hardware
-- `sim/src/epd_sim.c` implements the same API as `src/epd_drv.c`, dumps framebuffer as hex over stdout with `!F!`/`!E!` framing
-- `sim/view.py` reads hex frames from stdin, inverts polarity (framebuffer bit=1 is white, PBM bit=1 is black), writes PBM to `/tmp/nrfwarch.pbm`
-- feh auto-launches with `--auto-reload` for live display
-- Sim runs on Zephyr `native_sim` target (native Linux process, not QEMU). Time advances 1 min/sec.
-
-### Sim architecture
-```
-Zephyr native_sim binary (zephyr.exe)
-  -> watchface.c renders to framebuffer (same code as hardware)
-  -> epd_sim.c dumps hex frames to stdout
-  -> view.py reads stdin, converts to PBM
-  -> feh displays the image with auto-reload
-```
-
-### Frame protocol
-- `!F!` = frame start, then 5000 bytes as hex (32 bytes/line), `!E!` = frame end
-- view.py ignores everything outside markers (handles Zephyr log output mixed in)
-
-## 2026-04-25: Flake, Tests, and Font Fixes
-
-### Nix flake
-- Converted from shell.nix to flake.nix with three apps:
-  - `nix run .#setup-sdk` - downloads Zephyr v4.0 + SDK 0.17.0, patches all ELF binaries for NixOS
-  - `nix run .#test` - builds and runs ztest suite on QEMU x86
-  - `nix run .#sim` - builds and runs display simulator with feh viewer
-- Dev shell includes: cmake, ninja, west, qemu_full, feh, dtc, patchelf
-
-### NixOS SDK patching
-- Zephyr SDK binaries are dynamically linked with `/lib64/ld-linux-x86-64.so.2` interpreter
-- Must patchelf every ELF binary (bin/, libexec/, lib/) to point at NixOS's ld-linux
-- The setup-sdk app handles this automatically
-
-### Test suite (17 tests, all passing)
-- **Framebuffer**: clear sets all 0xFF, pixel set/get roundtrip, bounds checking, Y-flip at corners
-- **Fonts**: digit/colon array sizes match compile-time constants, all digits contain non-trivial data
-- **Rendering**: draw_time modifies buffer, different times produce different buffers, battery indicator renders, 0% vs 100% battery differs
-- **Glyph**: all-ones glyph sets pixel to black
-
-### Bugs fixed this session
-- **Inverted fonts**: `wf_draw_glyph` had `black = !(val & bit)` which inverted foreground/background. Fixed to only draw when bit=1 (foreground), skip bit=0 (background).
-- **Leading bar artifact**: Background pixels were being explicitly written as white on every glyph byte, overwriting adjacent content. Fixed by skipping background pixels entirely (`continue` on bit=0).
-- **Font data mismatch**: Original hand-written font data had wrong byte counts (112 bytes declared as 64). Replaced with programmatic generator.
-- **epd_clear stack overflow**: 5000-byte array on stack blew past 4KB main stack. Changed to static buffer.
-- **Devicetree binding**: `compatible = "simple-bus"` rejected custom GPIO properties. Created proper `nrfwarch,epd-ctrl.yaml` binding.
-
-### Next steps
-- BLE CTS client for time sync from phone
-- GRTC-based RTC for persistent timekeeping across system-off
-- Battery monitoring via ADC channel 7 with VBAT regulator
-- LSM6DSO IMU wrist-tilt wake detection
-- System-off power management with regulator control
-- Partial refresh for minute updates (avoid full refresh flicker)
diff --git a/dts/bindings/nrfwarch,epd-ctrl.yaml b/dts/bindings/nrfwarch,epd-ctrl.yaml
deleted file mode 100644
index b27e2b9..0000000
--- a/dts/bindings/nrfwarch,epd-ctrl.yaml
+++ /dev/null
@@ -1,20 +0,0 @@
-description: EPD GPIO control node for SSD1680
-compatible: "nrfwarch,epd-ctrl"
-
-properties:
-  cs-gpios:
-    type: phandle-array
-    required: true
-    description: Chip select GPIO
-  dc-gpios:
-    type: phandle-array
-    required: true
-    description: Data/command GPIO
-  rst-gpios:
-    type: phandle-array
-    required: true
-    description: Reset GPIO
-  busy-gpios:
-    type: phandle-array
-    required: true
-    description: Busy status GPIO
diff --git a/flake.lock b/flake.lock
deleted file mode 100644
index 3f06416..0000000
--- a/flake.lock
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-  "nodes": {
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1777268161,
-        "narHash": "sha256-bxrdOn8SCOv8tN4JbTF/TXq7kjo9ag4M+C8yzzIRYbE=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "1c3fe55ad329cbcb28471bb30f05c9827f724c76",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
-      }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
diff --git a/flake.nix b/flake.nix
deleted file mode 100644
index 1fd6887..0000000
--- a/flake.nix
+++ /dev/null
@@ -1,167 +0,0 @@
-{
-  description = "nrfwarch - smartwatch firmware for Xiao nRF54L15 Sense";
-
-  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-    flake-utils.url = "github:numtide/flake-utils";
-  };
-
-  outputs =
-    {
-      self,
-      nixpkgs,
-      flake-utils,
-    }:
-    flake-utils.lib.eachDefaultSystem (
-      system:
-      let
-        pkgs = nixpkgs.legacyPackages.${system};
-
-        zephyrEnv = ''
-          export ZEPHYR_BASE="$(pwd)/.zephyr/zephyr"
-          export ZEPHYR_SDK_INSTALL_DIR="$(pwd)/.sdk/zephyr-sdk-0.17.4"
-          export ZEPHYR_TOOLCHAIN_VARIANT=zephyr
-        '';
-      in
-      {
-        devShells.default = pkgs.mkShell {
-          buildInputs = with pkgs; [
-            cmake
-            ninja
-            python312
-            python312Packages.pip
-            python312Packages.west
-            python312Packages.pyelftools
-            python312Packages.jsonschema
-            qemu_full
-            dtc
-            git
-            patchelf
-            gnumake
-            feh
-          ];
-
-          shellHook = zephyrEnv + ''
-            echo "--- nrfwarch ---"
-            echo "Zephyr:  $ZEPHYR_BASE"
-            echo "SDK:     $ZEPHYR_SDK_INSTALL_DIR"
-            echo ""
-            echo "Setup:     nix run .#setup-sdk"
-            echo "Tests:     nix run .#test"
-            echo "Simulate:  nix run .#sim"
-          '';
-
-          ZEPHYR_BASE = toString ./.zephyr/zephyr;
-          ZEPHYR_SDK_INSTALL_DIR = toString ./.sdk/zephyr-sdk-0.17.4;
-          ZEPHYR_TOOLCHAIN_VARIANT = "zephyr";
-        };
-
-        apps = {
-          setup-sdk = {
-            type = "app";
-            program = toString (
-              pkgs.writeShellScript "setup-sdk" ''
-                set -euo pipefail
-
-                SDK_VER="0.17.4"
-                SDK_DIR=".sdk/zephyr-sdk-$SDK_VER"
-                ZEPHYR_DIR=".zephyr"
-
-                export PATH="${pkgs.git}/bin:${pkgs.python312Packages.west}/bin:${pkgs.wget}/bin:${pkgs.xz}/bin:${pkgs.patchelf}/bin:${pkgs.findutils}/bin:${pkgs.gnugrep}/bin:${pkgs.file}/bin:${pkgs.curl}/bin:${pkgs.gnutar}/bin:$PATH"
-
-                if [ ! -d "$ZEPHYR_DIR/zephyr" ]; then
-                  echo "Initializing Zephyr workspace..."
-                  west init -m https://github.com/zephyrproject-rtos/zephyr --mr v4.3.0 "$ZEPHYR_DIR"
-                  (cd "$ZEPHYR_DIR" && west update)
-                  echo "Zephyr workspace ready."
-                else
-                  echo "Zephyr workspace already exists."
-                fi
-
-                if [ ! -d "$SDK_DIR" ]; then
-                  echo "Downloading Zephyr SDK $SDK_VER..."
-                  mkdir -p .sdk
-                  curl -fsSL "https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v$SDK_VER/zephyr-sdk-''${SDK_VER}_linux-x86_64.tar.xz" \
-                    -o .sdk/zephyr-sdk.tar.xz
-                  echo "Extracting..."
-                  tar xf .sdk/zephyr-sdk.tar.xz -C .sdk
-                  rm .sdk/zephyr-sdk.tar.xz
-
-                  "$SDK_DIR/setup.sh" -t x86_64-zephyr-elf -t aarch64-zephyr-elf -t arm-zephyr-eabi
-
-                  echo "Patching binaries for NixOS..."
-                  LD_PATH="${pkgs.stdenv.cc.bintools.dynamicLinker}"
-                  find "$SDK_DIR" -type f | while read -r f; do
-                    if file "$f" 2>/dev/null | grep -q "ELF 64-bit.*dynamically linked"; then
-                      patchelf --set-interpreter "$LD_PATH" "$f" 2>/dev/null || true
-                    fi
-                  done
-                  echo "SDK ready."
-                else
-                  echo "SDK already exists."
-                fi
-
-                echo ""
-                echo "All set. Run 'nix develop' to enter the dev shell."
-              ''
-            );
-          };
-
-          test = {
-            type = "app";
-            program = toString (
-              pkgs.writeShellScript "test" ''
-                set -euo pipefail
-                ${zephyrEnv}
-
-                if [ ! -d "$ZEPHYR_BASE" ]; then
-                  echo "Zephyr not found. Run 'nix run .#setup-sdk' first."
-                  exit 1
-                fi
-
-                BUILD_DIR="build-test"
-                if [ ! -f "$BUILD_DIR/build.ninja" ]; then
-                  cmake -B "$BUILD_DIR" -GNinja -DBOARD=qemu_x86 -S tests
-                fi
-
-                ninja -C "$BUILD_DIR"
-                ninja -C "$BUILD_DIR" run
-              ''
-            );
-          };
-
-          sim = {
-            type = "app";
-            program = toString (
-              pkgs.writeShellScript "sim" ''
-                set -euo pipefail
-                ${zephyrEnv}
-
-                if [ ! -d "$ZEPHYR_BASE" ]; then
-                  echo "Zephyr not found. Run 'nix run .#setup-sdk' first."
-                  exit 1
-                fi
-
-                BUILD_DIR="build-sim"
-                if [ ! -f "$BUILD_DIR/build.ninja" ]; then
-                  cmake -B "$BUILD_DIR" -GNinja -DBOARD=qemu_x86 -S sim
-                fi
-                ninja -C "$BUILD_DIR"
-
-                cleanup() {
-                    kill $(jobs -p) 2>/dev/null || true
-                    wait 2>/dev/null || true
-                }
-                trap cleanup EXIT INT TERM
-
-                echo "Starting display sim (Ctrl+C to stop)..."
-                "${pkgs.python312}/bin/python3" sim/view.py < <(
-                  "${pkgs.ninja}/bin/ninja" -C "$BUILD_DIR" run 2>/dev/null
-                )
-              ''
-            );
-          };
-        };
-      }
-    );
-}
diff --git a/prj.conf b/prj.conf
deleted file mode 100644
index 9c61e3a..0000000
--- a/prj.conf
+++ /dev/null
@@ -1,11 +0,0 @@
-CONFIG_MAIN_STACK_SIZE=4096
-CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
-
-CONFIG_LOG=y
-CONFIG_PRINTK=y
-
-CONFIG_SPI=y
-CONFIG_GPIO=y
-
-CONFIG_NEWLIB_LIBC=y
-CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
diff --git a/sample.yaml b/sample.yaml
deleted file mode 100644
index 859eefa..0000000
--- a/sample.yaml
+++ /dev/null
@@ -1,7 +0,0 @@
-sample:
-  name: nrfwarch
-  description: Smartwatch firmware for Xiao nRF54L15 Sense with e-ink display
-tests:
-  test:
-    build_only: true
-    platform_allow: xiao_nrf54l15/nrf54l15/cpuapp
diff --git a/sim/CMakeLists.txt b/sim/CMakeLists.txt
deleted file mode 100644
index eacde5c..0000000
--- a/sim/CMakeLists.txt
+++ /dev/null
@@ -1,14 +0,0 @@
-cmake_minimum_required(VERSION 3.20.0)
-
-find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
-
-project(nrfwarch_sim)
-
-target_sources(app PRIVATE
-	src/main.c
-	src/epd_sim.c
-	../src/watchface.c
-	../src/fonts.c
-)
-
-target_include_directories(app PRIVATE ../src)
diff --git a/sim/prj.conf b/sim/prj.conf
deleted file mode 100644
index c8063ff..0000000
--- a/sim/prj.conf
+++ /dev/null
@@ -1,6 +0,0 @@
-CONFIG_SERIAL=y
-CONFIG_UART_CONSOLE=y
-CONFIG_CONSOLE=y
-CONFIG_PRINTK=y
-CONFIG_LOG=y
-CONFIG_MAIN_STACK_SIZE=8192
diff --git a/sim/src/epd_sim.c b/sim/src/epd_sim.c
deleted file mode 100644
index 6cc0a77..0000000
--- a/sim/src/epd_sim.c
+++ /dev/null
@@ -1,69 +0,0 @@
-#include "epd_drv.h"
-
-#include <zephyr/kernel.h>
-#include <zephyr/sys/printk.h>
-
-#define CHUNK 32
-
-static void hex_byte(char *out, uint8_t val)
-{
-	out[0] = "0123456789abcdef"[val >> 4];
-	out[1] = "0123456789abcdef"[val & 0x0F];
-}
-
-static void dump_frame(const uint8_t *image)
-{
-	printk("!F!\n");
-	char line[CHUNK * 2 + 1];
-	for (int i = 0; i < EPD_BUFFER_SIZE; i += CHUNK) {
-		int n = (EPD_BUFFER_SIZE - i > CHUNK) ? CHUNK : (EPD_BUFFER_SIZE - i);
-		for (int j = 0; j < n; j++) {
-			hex_byte(line + j * 2, image[i + j]);
-		}
-		line[n * 2] = '\0';
-		printk("%s\n", line);
-	}
-	printk("!E!\n");
-}
-
-int epd_init(void)
-{
-	printk("SIM: epd_init\n");
-	return 0;
-}
-
-void epd_full_refresh(const uint8_t *image)
-{
-	dump_frame(image);
-}
-
-void epd_clear(void)
-{
-	uint8_t white[EPD_BUFFER_SIZE];
-	for (int i = 0; i < EPD_BUFFER_SIZE; i++) {
-		white[i] = 0xFF;
-	}
-	dump_frame(white);
-}
-
-void epd_set_base_image(const uint8_t *image)
-{
-	dump_frame(image);
-}
-
-void epd_partial_region(const uint8_t *image, size_t len,
-			int x_start, int x_end,
-			int y_start, int y_end)
-{
-	dump_frame(image);
-}
-
-void epd_deep_sleep(void)
-{
-	printk("SIM: sleep\n");
-}
-
-void epd_wakeup(void)
-{
-	printk("SIM: wakeup\n");
-}
diff --git a/sim/src/main.c b/sim/src/main.c
deleted file mode 100644
index e908c01..0000000
--- a/sim/src/main.c
+++ /dev/null
@@ -1,41 +0,0 @@
-#include <zephyr/kernel.h>
-#include <zephyr/logging/log.h>
-
-#include "epd_drv.h"
-#include "watchface.h"
-
-LOG_MODULE_REGISTER(main, LOG_LEVEL_INF);
-
-void main(void)
-{
-	int hours = 12;
-	int minutes = 0;
-	int battery = 87;
-
-	epd_init();
-	LOG_INF("nrfwarch sim started");
-
-	while (1) {
-		wf_clear();
-		wf_draw_time(hours, minutes);
-		wf_draw_battery_indicator(battery);
-		epd_set_base_image(wf_get_buffer());
-
-		LOG_INF("%02d:%02d bat=%d%%", hours, minutes, battery);
-
-		k_sleep(K_MSEC(800));
-
-		minutes++;
-		if (minutes >= 60) {
-			minutes = 0;
-			hours++;
-			if (hours >= 24) {
-				hours = 0;
-			}
-			battery -= 2;
-			if (battery < 0) {
-				battery = 87;
-			}
-		}
-	}
-}
diff --git a/sim/view.py b/sim/view.py
deleted file mode 100644
index df36f76..0000000
--- a/sim/view.py
+++ /dev/null
@@ -1,92 +0,0 @@
-#!/usr/bin/env python3
-"""Reads hex-framed display data from stdin, writes PBM, auto-launches feh."""
-
-import sys
-import os
-import signal
-import subprocess
-import time
-
-WIDTH = 200
-HEIGHT = 200
-BUFSIZE = (WIDTH * HEIGHT) // 8
-OUT = "/tmp/nrfwarch.pbm"
-FRAME_START = "!F!"
-FRAME_END = "!E!"
-
-feh_proc = None
-
-
-def write_pbm(data):
-    header = f"P4\n{WIDTH} {HEIGHT}\n".encode()
-    inverted = bytes((~b) & 0xFF for b in data)
-    tmp = OUT + ".tmp"
-    with open(tmp, "wb") as f:
-        f.write(header)
-        f.write(inverted)
-    os.replace(tmp, OUT)
-
-
-def launch_feh():
-    global feh_proc
-    if feh_proc is not None and feh_proc.poll() is None:
-        return
-    try:
-        feh_proc = subprocess.Popen(
-            [
-                "feh",
-                "--force-aliasing",
-                "--scale",
-                "auto",
-                "--auto-reload",
-                "--title", "nrfwarch sim",
-                OUT,
-            ],
-            stdout=subprocess.DEVNULL,
-            stderr=subprocess.DEVNULL,
-        )
-    except FileNotFoundError:
-        print("feh not found, writing PBM to " + OUT)
-
-
-def cleanup(*_):
-    global feh_proc
-    if feh_proc and feh_proc.poll() is None:
-        feh_proc.terminate()
-    sys.exit(0)
-
-
-def main():
-    signal.signal(signal.SIGTERM, cleanup)
-    signal.signal(signal.SIGINT, cleanup)
-
-    write_pbm(bytes([0xFF] * BUFSIZE))
-    launch_feh()
-
-    capturing = False
-    hex_buf = ""
-    frame_count = 0
-
-    for line in sys.stdin:
-        line = line.strip()
-        if line == FRAME_START:
-            capturing = True
-            hex_buf = ""
-        elif line == FRAME_END:
-            if capturing and hex_buf:
-                try:
-                    data = bytes.fromhex(hex_buf)
-                    if len(data) == BUFSIZE:
-                        write_pbm(data)
-                        frame_count += 1
-                        print(f"  frame {frame_count}", file=sys.stderr)
-                except ValueError:
-                    pass
-            capturing = False
-            hex_buf = ""
-        elif capturing:
-            hex_buf += line
-
-
-if __name__ == "__main__":
-    main()
diff --git a/src/epd_drv.c b/src/epd_drv.c
deleted file mode 100644
index 26c9b8d..0000000
--- a/src/epd_drv.c
+++ /dev/null
@@ -1,246 +0,0 @@
-#include "epd_drv.h"
-
-#include <string.h>
-#include <zephyr/kernel.h>
-#include <zephyr/device.h>
-#include <zephyr/drivers/spi.h>
-#include <zephyr/drivers/gpio.h>
-#include <zephyr/logging/log.h>
-
-LOG_MODULE_REGISTER(epd, LOG_LEVEL_INF);
-
-#define EPD_SPI_BUS   DT_NODELABEL(xiao_spi)
-#define EPD_CTRL_NODE DT_NODELABEL(epd_ctrl)
-
-static const struct gpio_dt_spec epd_cs   = GPIO_DT_SPEC_GET(EPD_CTRL_NODE, cs_gpios);
-static const struct gpio_dt_spec epd_dc   = GPIO_DT_SPEC_GET(EPD_CTRL_NODE, dc_gpios);
-static const struct gpio_dt_spec epd_rst  = GPIO_DT_SPEC_GET(EPD_CTRL_NODE, rst_gpios);
-static const struct gpio_dt_spec epd_busy = GPIO_DT_SPEC_GET(EPD_CTRL_NODE, busy_gpios);
-
-static const struct device *spi_dev;
-static struct spi_config spi_cfg;
-
-#define SWRESET      0x12
-#define DRIVER_OUT   0x01
-#define DATA_ENTRY   0x11
-#define RAM_X_RANGE  0x44
-#define RAM_Y_RANGE  0x45
-#define RAM_X_ADDR   0x4E
-#define RAM_Y_ADDR   0x4F
-#define BORDER_WF    0x3C
-#define TEMP_SENSOR  0x18
-#define UPDATE_CTRL2 0x22
-#define ACTIVATE     0x20
-#define WRITE_RAM_BW 0x24
-#define DEEP_SLEEP   0x10
-#define VCOM         0x2C
-
-static int wait_busy(void)
-{
-	int retries = 0;
-	while (gpio_pin_get_dt(&epd_busy) == 1) {
-		k_msleep(10);
-		if (++retries > 3000) {
-			LOG_ERR("BUSY timeout");
-			return -ETIMEDOUT;
-		}
-	}
-	return 0;
-}
-
-static int spi_send_buf(const uint8_t *data, size_t len)
-{
-	struct spi_buf buf = { .buf = (void *)data, .len = len };
-	struct spi_buf_set set = { .buffers = &buf, .count = 1 };
-	return spi_write(spi_dev, &spi_cfg, &set);
-}
-
-static int send_command(uint8_t cmd)
-{
-	gpio_pin_set_dt(&epd_cs, 0);
-	gpio_pin_set_dt(&epd_dc, 0);
-	int ret = spi_send_buf(&cmd, 1);
-	gpio_pin_set_dt(&epd_cs, 1);
-	return ret;
-}
-
-static int send_data(uint8_t data)
-{
-	gpio_pin_set_dt(&epd_cs, 0);
-	gpio_pin_set_dt(&epd_dc, 1);
-	int ret = spi_send_buf(&data, 1);
-	gpio_pin_set_dt(&epd_cs, 1);
-	return ret;
-}
-
-static int send_data_buf(const uint8_t *data, size_t len)
-{
-	gpio_pin_set_dt(&epd_cs, 0);
-	gpio_pin_set_dt(&epd_dc, 1);
-	int ret = spi_send_buf(data, len);
-	gpio_pin_set_dt(&epd_cs, 1);
-	return ret;
-}
-
-static void hw_reset(void)
-{
-	gpio_pin_set_dt(&epd_rst, 0);
-	k_msleep(20);
-	gpio_pin_set_dt(&epd_rst, 1);
-	k_msleep(20);
-	wait_busy();
-}
-
-static int init_gpios(void)
-{
-	if (!gpio_is_ready_dt(&epd_cs) || !gpio_is_ready_dt(&epd_dc) ||
-	    !gpio_is_ready_dt(&epd_rst) || !gpio_is_ready_dt(&epd_busy)) {
-		LOG_ERR("EPD GPIOs not ready");
-		return -ENODEV;
-	}
-	gpio_pin_configure_dt(&epd_cs, GPIO_OUTPUT_HIGH);
-	gpio_pin_configure_dt(&epd_dc, GPIO_OUTPUT_LOW);
-	gpio_pin_configure_dt(&epd_rst, GPIO_OUTPUT_HIGH);
-	gpio_pin_configure_dt(&epd_busy, GPIO_INPUT);
-	return 0;
-}
-
-static int init_spi(void)
-{
-	spi_dev = DEVICE_DT_GET(EPD_SPI_BUS);
-	if (!device_is_ready(spi_dev)) {
-		LOG_ERR("SPI device not ready");
-		return -ENODEV;
-	}
-	memset(&spi_cfg, 0, sizeof(spi_cfg));
-	spi_cfg.frequency = 4000000;
-	spi_cfg.operation = SPI_OP_MODE_MASTER | SPI_TRANSFER_MSB |
-			    SPI_WORD_SET(8) | SPI_LINES_SINGLE;
-	return 0;
-}
-
-static void set_ram_window(int x_start, int x_end,
-			   int y_start, int y_end)
-{
-	send_command(RAM_X_RANGE);
-	send_data(x_start);
-	send_data(x_end);
-	send_command(RAM_Y_RANGE);
-	send_data(y_end & 0xFF);
-	send_data((y_end >> 8) & 0xFF);
-	send_data(y_start & 0xFF);
-	send_data((y_start >> 8) & 0xFF);
-}
-
-static void set_ram_cursor(int x, int y)
-{
-	send_command(RAM_X_ADDR);
-	send_data(x);
-	send_command(RAM_Y_ADDR);
-	send_data(y & 0xFF);
-	send_data((y >> 8) & 0xFF);
-}
-
-static void trigger_full_update(void)
-{
-	send_command(UPDATE_CTRL2);
-	send_data(0xF7);
-	send_command(ACTIVATE);
-	wait_busy();
-}
-
-static void trigger_partial_update(void)
-{
-	send_command(UPDATE_CTRL2);
-	send_data(0xCF);
-	send_command(ACTIVATE);
-	wait_busy();
-}
-
-static void init_panel(void)
-{
-	send_command(SWRESET);
-	wait_busy();
-
-	send_command(DRIVER_OUT);
-	send_data(0xC7);
-	send_data(0x00);
-	send_data(0x00);
-
-	send_command(DATA_ENTRY);
-	send_data(0x01);
-
-	set_ram_window(0x00, 0x18, 0x00, 0xC7);
-
-	send_command(BORDER_WF);
-	send_data(0x05);
-
-	send_command(VCOM);
-	send_data(0xA5);
-
-	send_command(TEMP_SENSOR);
-	send_data(0x80);
-}
-
-int epd_init(void)
-{
-	int ret = init_gpios();
-	if (ret) return ret;
-
-	ret = init_spi();
-	if (ret) return ret;
-
-	hw_reset();
-	init_panel();
-	LOG_INF("SSD1680 initialized");
-	return 0;
-}
-
-void epd_full_refresh(const uint8_t *image)
-{
-	set_ram_window(0x00, 0x18, 0x00, 0xC7);
-	set_ram_cursor(0x00, 0xC7);
-	send_command(WRITE_RAM_BW);
-	send_data_buf(image, EPD_BUFFER_SIZE);
-	trigger_full_update();
-}
-
-static uint8_t white_buf[EPD_BUFFER_SIZE];
-void epd_clear(void)
-{
-	memset(white_buf, 0xFF, sizeof(white_buf));
-	epd_full_refresh(white_buf);
-}
-
-void epd_set_base_image(const uint8_t *image)
-{
-	set_ram_window(0x00, 0x18, 0x00, 0xC7);
-	set_ram_cursor(0x00, 0xC7);
-	send_command(WRITE_RAM_BW);
-	send_data_buf(image, EPD_BUFFER_SIZE);
-	trigger_full_update();
-}
-
-void epd_partial_region(const uint8_t *image, size_t len,
-			int x_start, int x_end,
-			int y_start, int y_end)
-{
-	set_ram_window(x_start, x_end, y_start, y_end);
-	set_ram_cursor(x_start, y_end);
-	send_command(WRITE_RAM_BW);
-	send_data_buf(image, len);
-	trigger_partial_update();
-}
-
-void epd_deep_sleep(void)
-{
-	send_command(DEEP_SLEEP);
-	send_data(0x01);
-	k_msleep(100);
-}
-
-void epd_wakeup(void)
-{
-	hw_reset();
-	init_panel();
-}
diff --git a/src/epd_drv.h b/src/epd_drv.h
deleted file mode 100644
index dd8895d..0000000
--- a/src/epd_drv.h
+++ /dev/null
@@ -1,23 +0,0 @@
-#ifndef EPD_DRV_H
-#define EPD_DRV_H
-
-#include <stdint.h>
-#include <stddef.h>
-
-#define EPD_WIDTH  200
-#define EPD_HEIGHT 200
-#define EPD_BUFFER_SIZE ((EPD_WIDTH * EPD_HEIGHT) / 8)
-#define EPD_LINE_BYTES  (EPD_WIDTH / 8)
-#define EPD_COLUMN_BYTES EPD_HEIGHT
-
-int epd_init(void);
-void epd_full_refresh(const uint8_t *image);
-void epd_clear(void);
-void epd_set_base_image(const uint8_t *image);
-void epd_partial_region(const uint8_t *image, size_t len,
-			int x_start, int x_end,
-			int y_start, int y_end);
-void epd_deep_sleep(void);
-void epd_wakeup(void);
-
-#endif
diff --git a/src/fonts.c b/src/fonts.c
deleted file mode 100644
index 4a07384..0000000
--- a/src/fonts.c
+++ /dev/null
@@ -1,467 +0,0 @@
-#include "fonts.h"
-
-const uint8_t font_digits[10][120] = {
-	{
-		0x0F, 0xFF, 0xF0,
-		0x0F, 0xFF, 0xF0,
-		0x0F, 0xFF, 0xF0,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x0F, 0xFF, 0xF0,
-		0x0F, 0xFF, 0xF0,
-		0x0F, 0xFF, 0xF0,
-	},
-	{
-		0x00, 0x00, 0x00,
-		0x0F, 0xFC, 0x00,
-		0x0F, 0xFC, 0x00,
-		0x0F, 0xFC, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x1C, 0x00,
-		0x00, 0x00, 0x00,
-	},
-	{
-		0x0F, 0xFF, 0xF0,
-		0x0F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF8,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x0F, 0xFF, 0xF8,
-		0x1F, 0xFF, 0xF8,
-		0x1F, 0xFF, 0xF0,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1F, 0xFF, 0xF0,
-		0x1F, 0xFF, 0xF0,
-		0x0F, 0xFF, 0xF0,
-	},
-	{
-		0x0F, 0xFF, 0xF0,
-		0x0F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF8,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x0F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF8,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x0F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF0,
-	},
-	{
-		0x00, 0x00, 0x00,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1F, 0xFF, 0xF8,
-		0x1F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF8,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x00,
-	},
-	{
-		0x0F, 0xFF, 0xF0,
-		0x1F, 0xFF, 0xF0,
-		0x1F, 0xFF, 0xF0,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1F, 0xFF, 0xF0,
-		0x1F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF8,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x0F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF0,
-	},
-	{
-		0x0F, 0xFF, 0xF0,
-		0x1F, 0xFF, 0xF0,
-		0x1F, 0xFF, 0xF0,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1C, 0x00, 0x00,
-		0x1F, 0xFF, 0xF0,
-		0x1F, 0xFF, 0xF8,
-		0x1F, 0xFF, 0xF8,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1F, 0xFF, 0xF8,
-		0x1F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF0,
-	},
-	{
-		0x0F, 0xFF, 0xF0,
-		0x0F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF8,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x00,
-	},
-	{
-		0x0F, 0xFF, 0xF0,
-		0x1F, 0xFF, 0xF8,
-		0x1F, 0xFF, 0xF8,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1F, 0xFF, 0xF8,
-		0x1F, 0xFF, 0xF8,
-		0x1F, 0xFF, 0xF8,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1F, 0xFF, 0xF8,
-		0x1F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF0,
-	},
-	{
-		0x0F, 0xFF, 0xF0,
-		0x1F, 0xFF, 0xF8,
-		0x1F, 0xFF, 0xF8,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1C, 0x00, 0x38,
-		0x1F, 0xFF, 0xF8,
-		0x1F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF8,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x00, 0x00, 0x38,
-		0x0F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF8,
-		0x0F, 0xFF, 0xF0,
-	},
-};
-
-const uint8_t font_colon[40] = {
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x1C,
-	0x1C,
-	0x1C,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x1C,
-	0x1C,
-	0x1C,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-	0x00,
-};
diff --git a/src/fonts.h b/src/fonts.h
deleted file mode 100644
index 44d686b..0000000
--- a/src/fonts.h
+++ /dev/null
@@ -1,18 +0,0 @@
-#ifndef FONTS_H
-#define FONTS_H
-
-#include <stdint.h>
-#include <stddef.h>
-
-#define FONT_DIGIT_W  24
-#define FONT_DIGIT_H  40
-#define FONT_DIGIT_BYTES (FONT_DIGIT_W * FONT_DIGIT_H / 8)
-
-#define FONT_COLON_W  8
-#define FONT_COLON_H  40
-#define FONT_COLON_BYTES (FONT_COLON_W * FONT_COLON_H / 8)
-
-extern const uint8_t font_digits[10][FONT_DIGIT_BYTES];
-extern const uint8_t font_colon[FONT_COLON_BYTES];
-
-#endif
diff --git a/src/main.c b/src/main.c
deleted file mode 100644
index 8c0908e..0000000
--- a/src/main.c
+++ /dev/null
@@ -1,52 +0,0 @@
-#include <zephyr/kernel.h>
-#include <zephyr/logging/log.h>
-
-#include "epd_drv.h"
-#include "watchface.h"
-
-LOG_MODULE_REGISTER(main, LOG_LEVEL_INF);
-
-int main(void)
-{
-	int ret;
-
-	LOG_INF("nrfwarch starting");
-
-	ret = epd_init();
-	if (ret) {
-		LOG_ERR("EPD init failed: %d", ret);
-		return ret;
-	}
-
-	wf_clear();
-	wf_draw_time(12, 0);
-	wf_draw_battery_indicator(75);
-
-	LOG_INF("Rendering initial watch face");
-	epd_full_refresh(wf_get_buffer());
-	LOG_INF("Initial render complete");
-
-	int hours = 12;
-	int minutes = 0;
-
-	while (1) {
-		k_sleep(K_SECONDS(60));
-
-		minutes++;
-		if (minutes >= 60) {
-			minutes = 0;
-			hours++;
-			if (hours >= 24) {
-				hours = 0;
-			}
-		}
-
-		wf_clear();
-		wf_draw_time(hours, minutes);
-		wf_draw_battery_indicator(75);
-
-		epd_set_base_image(wf_get_buffer());
-
-		LOG_INF("Updated: %02d:%02d", hours, minutes);
-	}
-}
diff --git a/src/watchface.c b/src/watchface.c
deleted file mode 100644
index d683437..0000000
--- a/src/watchface.c
+++ /dev/null
@@ -1,115 +0,0 @@
-#include "watchface.h"
-#include "fonts.h"
-#include <string.h>
-
-static uint8_t framebuffer[WF_BUF_SIZE];
-
-void wf_clear(void)
-{
-	memset(framebuffer, 0xFF, WF_BUF_SIZE);
-}
-
-void wf_set_pixel(int x, int y, int black)
-{
-	if (x < 0 || x >= WF_WIDTH || y < 0 || y >= WF_HEIGHT) {
-		return;
-	}
-	int ram_row = (WF_HEIGHT - 1) - y;
-	int byte_idx = ram_row * WF_LINE_BYTES + (x / 8);
-	int bit = 7 - (x % 8);
-
-	if (black) {
-		framebuffer[byte_idx] &= ~(1 << bit);
-	} else {
-		framebuffer[byte_idx] |= (1 << bit);
-	}
-}
-
-int wf_get_pixel(int x, int y)
-{
-	if (x < 0 || x >= WF_WIDTH || y < 0 || y >= WF_HEIGHT) {
-		return -1;
-	}
-	int ram_row = (WF_HEIGHT - 1) - y;
-	int byte_idx = ram_row * WF_LINE_BYTES + (x / 8);
-	int bit = 7 - (x % 8);
-	return (framebuffer[byte_idx] >> bit) & 1;
-}
-
-void wf_draw_glyph(const uint8_t *glyph, int glyph_w, int glyph_h,
-		   int dst_x, int dst_y)
-{
-	int glyph_line_bytes = glyph_w / 8;
-
-	for (int row = 0; row < glyph_h; row++) {
-		for (int byte_col = 0; byte_col < glyph_line_bytes; byte_col++) {
-			uint8_t val = glyph[row * glyph_line_bytes + byte_col];
-			for (int bit = 0; bit < 8; bit++) {
-				if (!(val & (1 << bit))) {
-					continue;
-				}
-				int px = dst_x + byte_col * 8 + (7 - bit);
-				int py = dst_y + row;
-				wf_set_pixel(px, py, 1);
-			}
-		}
-	}
-}
-
-#define TIME_DIGIT_W  FONT_DIGIT_W
-#define TIME_DIGIT_H  FONT_DIGIT_H
-#define TIME_COLON_W  FONT_COLON_W
-#define TIME_COLON_H  FONT_COLON_H
-#define TIME_GAP      4
-
-#define TIME_TOTAL_W (4 * TIME_DIGIT_W + TIME_COLON_W + 4 * TIME_GAP)
-#define TIME_X_START ((WF_WIDTH - TIME_TOTAL_W) / 2)
-#define TIME_Y_START 40
-
-void wf_draw_time(int hours, int minutes)
-{
-	int h1 = (hours / 10) % 10;
-	int h2 = hours % 10;
-	int m1 = (minutes / 10) % 10;
-	int m2 = minutes % 10;
-
-	int x = TIME_X_START;
-
-	wf_draw_glyph(font_digits[h1], TIME_DIGIT_W, TIME_DIGIT_H, x, TIME_Y_START);
-	x += TIME_DIGIT_W + TIME_GAP;
-
-	wf_draw_glyph(font_digits[h2], TIME_DIGIT_W, TIME_DIGIT_H, x, TIME_Y_START);
-	x += TIME_DIGIT_W + TIME_GAP;
-
-	wf_draw_glyph(font_colon, TIME_COLON_W, TIME_COLON_H, x, TIME_Y_START);
-	x += TIME_COLON_W + TIME_GAP;
-
-	wf_draw_glyph(font_digits[m1], TIME_DIGIT_W, TIME_DIGIT_H, x, TIME_Y_START);
-	x += TIME_DIGIT_W + TIME_GAP;
-
-	wf_draw_glyph(font_digits[m2], TIME_DIGIT_W, TIME_DIGIT_H, x, TIME_Y_START);
-}
-
-void wf_draw_battery_indicator(int percent)
-{
-	int bar_w = 30;
-	int bar_h = 8;
-	int x_start = WF_WIDTH - bar_w - 10;
-	int y_start = 10;
-
-	for (int x = 0; x < bar_w; x++) {
-		for (int y = 0; y < bar_h; y++) {
-			int is_border = (x == 0 || x == bar_w - 1 ||
-					 y == 0 || y == bar_h - 1);
-			int fill_end = 1 + (percent * (bar_w - 2)) / 100;
-			int is_filled = (x >= 1 && x < fill_end &&
-					 y >= 1 && y < bar_h - 1);
-			wf_set_pixel(x_start + x, y_start + y, is_border || is_filled);
-		}
-	}
-}
-
-uint8_t *wf_get_buffer(void)
-{
-	return framebuffer;
-}
diff --git a/src/watchface.h b/src/watchface.h
deleted file mode 100644
index 4669da2..0000000
--- a/src/watchface.h
+++ /dev/null
@@ -1,20 +0,0 @@
-#ifndef WATCHFACE_H
-#define WATCHFACE_H
-
-#include <stdint.h>
-
-#define WF_WIDTH  200
-#define WF_HEIGHT 200
-#define WF_BUF_SIZE ((WF_WIDTH * WF_HEIGHT) / 8)
-#define WF_LINE_BYTES (WF_WIDTH / 8)
-
-void wf_clear(void);
-void wf_set_pixel(int x, int y, int black);
-int wf_get_pixel(int x, int y);
-void wf_draw_glyph(const uint8_t *glyph, int glyph_w, int glyph_h,
-		   int dst_x, int dst_y);
-void wf_draw_time(int hours, int minutes);
-void wf_draw_battery_indicator(int percent);
-uint8_t *wf_get_buffer(void);
-
-#endif
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
deleted file mode 100644
index 470c5f5..0000000
--- a/tests/CMakeLists.txt
+++ /dev/null
@@ -1,13 +0,0 @@
-cmake_minimum_required(VERSION 3.20.0)
-
-find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
-
-project(nrfwarch_test)
-
-target_sources(app PRIVATE
-	src/main.c
-	../src/watchface.c
-	../src/fonts.c
-)
-
-target_include_directories(app PRIVATE ../src)
diff --git a/tests/prj.conf b/tests/prj.conf
deleted file mode 100644
index cdca1e9..0000000
--- a/tests/prj.conf
+++ /dev/null
@@ -1,2 +0,0 @@
-CONFIG_ZTEST=y
-CONFIG_MAIN_STACK_SIZE=8192
diff --git a/tests/sample.yaml b/tests/sample.yaml
deleted file mode 100644
index 9e959cc..0000000
--- a/tests/sample.yaml
+++ /dev/null
@@ -1,7 +0,0 @@
-sample:
-  name: nrfwarch tests
-tests:
-  test:
-    build_only: false
-    platform_allow: qemu_x86
-    tags: testing
diff --git a/tests/src/main.c b/tests/src/main.c
deleted file mode 100644
index efbb3e1..0000000
--- a/tests/src/main.c
+++ /dev/null
@@ -1,217 +0,0 @@
-#include <zephyr/ztest.h>
-#include <string.h>
-#include "watchface.h"
-#include "fonts.h"
-
-ZTEST(nrfwarch, test_wf_clear_sets_all_white)
-{
-	wf_clear();
-	uint8_t *buf = wf_get_buffer();
-	for (int i = 0; i < WF_BUF_SIZE; i++) {
-		zassert_equal(buf[i], 0xFF,
-			      "byte %d should be 0xFF (white), got 0x%02X", i, buf[i]);
-	}
-}
-
-ZTEST(nrfwarch, test_wf_set_pixel_out_of_bounds)
-{
-	wf_clear();
-	wf_set_pixel(-1, 0, 1);
-	wf_set_pixel(0, -1, 1);
-	wf_set_pixel(WF_WIDTH, 0, 1);
-	wf_set_pixel(0, WF_HEIGHT, 1);
-
-	uint8_t *buf = wf_get_buffer();
-	for (int i = 0; i < WF_BUF_SIZE; i++) {
-		zassert_equal(buf[i], 0xFF, "out-of-bounds pixel modified buffer at byte %d", i);
-	}
-}
-
-ZTEST(nrfwarch, test_wf_set_pixel_black_top_left)
-{
-	wf_clear();
-	wf_set_pixel(0, WF_HEIGHT - 1, 1);
-
-	uint8_t *buf = wf_get_buffer();
-	zassert_equal(buf[0], 0x7F,
-		      "top-left pixel (x=0, y=199) should set bit 7 of byte 0, got 0x%02X",
-		      buf[0]);
-}
-
-ZTEST(nrfwarch, test_wf_set_pixel_black_bottom_left)
-{
-	wf_clear();
-	wf_set_pixel(0, 0, 1);
-
-	uint8_t *buf = wf_get_buffer();
-	int last_row = (WF_HEIGHT - 1) * WF_LINE_BYTES;
-	zassert_equal(buf[last_row], 0x7F,
-		      "bottom-left pixel (x=0, y=0) should set bit 7 of last row byte, got 0x%02X",
-		      buf[last_row]);
-}
-
-ZTEST(nrfwarch, test_wf_set_then_clear_pixel)
-{
-	wf_clear();
-	wf_set_pixel(10, 10, 1);
-	int after_black = wf_get_pixel(10, 10);
-	zassert_equal(after_black, 0, "pixel should be black (0), got %d", after_black);
-
-	wf_set_pixel(10, 10, 0);
-	int after_white = wf_get_pixel(10, 10);
-	zassert_equal(after_white, 1, "pixel should be white (1), got %d", after_white);
-}
-
-ZTEST(nrfwarch, test_wf_get_pixel_out_of_bounds)
-{
-	zassert_equal(wf_get_pixel(-1, 0), -1);
-	zassert_equal(wf_get_pixel(0, -1), -1);
-	zassert_equal(wf_get_pixel(WF_WIDTH, 0), -1);
-	zassert_equal(wf_get_pixel(0, WF_HEIGHT), -1);
-}
-
-ZTEST(nrfwarch, test_font_digits_size)
-{
-	for (int d = 0; d < 10; d++) {
-		size_t expected = (size_t)(FONT_DIGIT_W * FONT_DIGIT_H / 8);
-		zassert_equal(sizeof(font_digits[d]), expected,
-			      "digit %d: expected %zu bytes, got %zu",
-			      d, expected, sizeof(font_digits[d]));
-	}
-}
-
-ZTEST(nrfwarch, test_font_colon_size)
-{
-	size_t expected = (size_t)(FONT_COLON_W * FONT_COLON_H / 8);
-	zassert_equal(sizeof(font_colon), expected,
-		      "colon: expected %zu bytes, got %zu",
-		      expected, sizeof(font_colon));
-}
-
-ZTEST(nrfwarch, test_font_digit_not_all_ff)
-{
-	for (int d = 0; d < 10; d++) {
-		int all_ff = 1;
-		for (size_t i = 0; i < sizeof(font_digits[d]); i++) {
-			if (font_digits[d][i] != 0xFF) {
-				all_ff = 0;
-				break;
-			}
-		}
-		zassert_false(all_ff, "digit %d is all 0xFF (empty/white)", d);
-	}
-}
-
-ZTEST(nrfwarch, test_font_colon_not_all_ff)
-{
-	int all_ff = 1;
-	for (size_t i = 0; i < sizeof(font_colon); i++) {
-		if (font_colon[i] != 0xFF) {
-			all_ff = 0;
-			break;
-		}
-	}
-	zassert_false(all_ff, "colon is all 0xFF (empty/white)");
-}
-
-ZTEST(nrfwarch, test_wf_draw_time_modifies_buffer)
-{
-	wf_clear();
-	wf_draw_time(12, 34);
-
-	uint8_t *buf = wf_get_buffer();
-	int any_black = 0;
-	for (int i = 0; i < WF_BUF_SIZE; i++) {
-		if (buf[i] != 0xFF) {
-			any_black = 1;
-			break;
-		}
-	}
-	zassert_true(any_black, "draw_time produced no visible pixels");
-}
-
-ZTEST(nrfwarch, test_wf_draw_time_different_times)
-{
-	wf_clear();
-	wf_draw_time(11, 11);
-	uint8_t buf_a[WF_BUF_SIZE];
-	memcpy(buf_a, wf_get_buffer(), WF_BUF_SIZE);
-
-	wf_clear();
-	wf_draw_time(22, 22);
-	uint8_t *buf_b = wf_get_buffer();
-
-	int differs = 0;
-	for (int i = 0; i < WF_BUF_SIZE; i++) {
-		if (buf_a[i] != buf_b[i]) {
-			differs = 1;
-			break;
-		}
-	}
-	zassert_true(differs, "different times produce identical buffers");
-}
-
-ZTEST(nrfwarch, test_wf_draw_battery_indicator)
-{
-	wf_clear();
-	wf_draw_battery_indicator(100);
-
-	uint8_t *buf = wf_get_buffer();
-	int any_black = 0;
-	for (int i = 0; i < WF_BUF_SIZE; i++) {
-		if (buf[i] != 0xFF) {
-			any_black = 1;
-			break;
-		}
-	}
-	zassert_true(any_black, "battery indicator produced no visible pixels");
-}
-
-ZTEST(nrfwarch, test_wf_draw_battery_zero_vs_full)
-{
-	wf_clear();
-	wf_draw_battery_indicator(0);
-	uint8_t buf_empty[WF_BUF_SIZE];
-	memcpy(buf_empty, wf_get_buffer(), WF_BUF_SIZE);
-
-	wf_clear();
-	wf_draw_battery_indicator(100);
-	uint8_t *buf_full = wf_get_buffer();
-
-	int differs = 0;
-	for (int i = 0; i < WF_BUF_SIZE; i++) {
-		if (buf_empty[i] != buf_full[i]) {
-			differs = 1;
-			break;
-		}
-	}
-	zassert_true(differs, "0%% and 100%% battery look identical");
-}
-
-ZTEST(nrfwarch, test_epd_buffer_size)
-{
-	zassert_equal(WF_BUF_SIZE, 5000, "200x200 / 8 should be 5000, got %d", WF_BUF_SIZE);
-	zassert_equal(WF_LINE_BYTES, 25, "200/8 should be 25, got %d", WF_LINE_BYTES);
-}
-
-ZTEST(nrfwarch, test_wf_draw_glyph_modifies_pixels)
-{
-	wf_clear();
-
-	uint8_t test_glyph[] = { 0xFF };
-	wf_draw_glyph(test_glyph, 8, 1, 50, 50);
-
-	zassert_equal(wf_get_pixel(50, 50), 0, "pixel should be black after drawing all-ones glyph");
-}
-
-ZTEST(nrfwarch, test_wf_pixel_symmetry)
-{
-	wf_clear();
-	wf_set_pixel(100, 100, 1);
-	zassert_equal(wf_get_pixel(100, 100), 0, "center pixel should be black");
-
-	wf_set_pixel(100, 100, 0);
-	zassert_equal(wf_get_pixel(100, 100), 1, "center pixel should be white after clear");
-}
-
-ZTEST_SUITE(nrfwarch, NULL, NULL, NULL, NULL, NULL);
diff --git a/tools/gen_fonts.py b/tools/gen_fonts.py
deleted file mode 100644
index 44a080d..0000000
--- a/tools/gen_fonts.py
+++ /dev/null
@@ -1,201 +0,0 @@
-#!/usr/bin/env python3
-"""Generate bitmap digit/colon fonts as C arrays for the e-ink watchface.
-
-Renders digits as stroked outlines onto a pixel grid.
-'#' = black (drawn), '.' = white (background).
-Bit=0 is black (drawn), bit=1 is white (background) in the output.
-"""
-
-DIGIT_W = 24
-DIGIT_H = 40
-COLON_W = 8
-COLON_H = 40
-
-
-def make_grid(w, h):
-    return [["." for _ in range(w)] for _ in range(h)]
-
-
-def fill_rect(grid, x1, y1, x2, y2):
-    for y in range(max(0, y1), min(len(grid), y2 + 1)):
-        for x in range(max(0, x1), min(len(grid[0]), x2 + 1)):
-            grid[y][x] = "#"
-
-
-def draw_hline(grid, y, x1, x2, thickness=2):
-    fill_rect(grid, x1, y - thickness // 2, x2, y + thickness // 2)
-
-
-def draw_vline(grid, x, y1, y2, thickness=2):
-    fill_rect(grid, x - thickness // 2, y1, x + thickness // 2, y2)
-
-
-def draw_digit(d):
-    g = make_grid(DIGIT_W, DIGIT_H)
-    W = DIGIT_W
-    H = DIGIT_H
-    t = 2  # stroke thickness
-    m = 3  # margin
-
-    top = t // 2
-    bot = H - t // 2 - 1
-    left = m + t // 2
-    right = W - m - t // 2 - 1
-    mid_y = H // 2
-
-    if d == 0:
-        draw_vline(g, left, top + t, bot - t, t)
-        draw_vline(g, right, top + t, bot - t, t)
-        draw_hline(g, top, left, right, t)
-        draw_hline(g, bot, left, right, t)
-    elif d == 1:
-        draw_vline(g, W // 2, top, bot, t)
-        fill_rect(g, left, top, W // 2, top + t)
-    elif d == 2:
-        draw_hline(g, top, left, right, t)
-        draw_vline(g, right, top, mid_y, t)
-        draw_hline(g, mid_y, left, right, t)
-        draw_vline(g, left, mid_y, bot, t)
-        draw_hline(g, bot, left, right, t)
-    elif d == 3:
-        draw_hline(g, top, left, right, t)
-        draw_vline(g, right, top, bot, t)
-        draw_hline(g, mid_y, left, right, t)
-        draw_hline(g, bot, left, right, t)
-    elif d == 4:
-        draw_vline(g, left, top, mid_y, t)
-        draw_hline(g, mid_y, left, right, t)
-        draw_vline(g, right, top, bot, t)
-    elif d == 5:
-        draw_hline(g, top, left, right, t)
-        draw_vline(g, left, top, mid_y, t)
-        draw_hline(g, mid_y, left, right, t)
-        draw_vline(g, right, mid_y, bot, t)
-        draw_hline(g, bot, left, right, t)
-    elif d == 6:
-        draw_hline(g, top, left, right, t)
-        draw_vline(g, left, top, bot, t)
-        draw_hline(g, mid_y, left, right, t)
-        draw_vline(g, right, mid_y, bot, t)
-        draw_hline(g, bot, left, right, t)
-    elif d == 7:
-        draw_hline(g, top, left, right, t)
-        draw_vline(g, right, top, bot, t)
-    elif d == 8:
-        draw_hline(g, top, left, right, t)
-        draw_hline(g, mid_y, left, right, t)
-        draw_hline(g, bot, left, right, t)
-        draw_vline(g, left, top, bot, t)
-        draw_vline(g, right, top, bot, t)
-    elif d == 9:
-        draw_hline(g, top, left, right, t)
-        draw_vline(g, left, top, mid_y, t)
-        draw_hline(g, mid_y, left, right, t)
-        draw_vline(g, right, top, bot, t)
-        draw_hline(g, bot, left, right, t)
-
-    return ["".join(row) for row in g]
-
-
-def draw_colon():
-    g = make_grid(COLON_W, COLON_H)
-    cx = COLON_W // 2
-    t = 2
-    fill_rect(g, cx - 1, COLON_H // 4 - 1, cx + 1, COLON_H // 4 + 1)
-    fill_rect(g, cx - 1, 3 * COLON_H // 4 - 1, cx + 1, 3 * COLON_H // 4 + 1)
-    return ["".join(row) for row in g]
-
-
-def pattern_to_bytes(pattern, width):
-    rows = []
-    for row_str in pattern:
-        for byte_idx in range(width // 8):
-            byte_val = 0
-            for bit in range(8):
-                col = byte_idx * 8 + bit
-                if col < len(row_str) and row_str[col] == "#":
-                    byte_val |= 1 << (7 - bit)
-            rows.append(byte_val)
-    return rows
-
-
-def format_c_array(name, data, width):
-    entry_bytes = width // 8
-    lines = []
-    for i in range(0, len(data), entry_bytes):
-        chunk = data[i : i + entry_bytes]
-        lines.append("\t" + ", ".join(f"0x{b:02X}" for b in chunk) + ",")
-    return f"static const uint8_t {name}[] = {{\n" + "\n".join(lines) + "\n};"
-
-
-def main():
-    digit_patterns = {str(d): draw_digit(d) for d in range(10)}
-    colon_pat = draw_colon()
-
-    h_lines = [
-        "#ifndef FONTS_H",
-        "#define FONTS_H",
-        "",
-        "#include <stdint.h>",
-        "#include <stddef.h>",
-        "",
-        f"#define FONT_DIGIT_W  {DIGIT_W}",
-        f"#define FONT_DIGIT_H  {DIGIT_H}",
-        f"#define FONT_DIGIT_BYTES (FONT_DIGIT_W * FONT_DIGIT_H / 8)",
-        "",
-        f"#define FONT_COLON_W  {COLON_W}",
-        f"#define FONT_COLON_H  {COLON_H}",
-        f"#define FONT_COLON_BYTES (FONT_COLON_W * FONT_COLON_H / 8)",
-        "",
-        "extern const uint8_t font_digits[10][FONT_DIGIT_BYTES];",
-        "extern const uint8_t font_colon[FONT_COLON_BYTES];",
-        "",
-        "#endif",
-        "",
-    ]
-
-    c_lines = [
-        '#include "fonts.h"',
-        "",
-    ]
-
-    entry_bytes = DIGIT_W // 8
-    entries = []
-    for d in range(10):
-        data = pattern_to_bytes(digit_patterns[str(d)], DIGIT_W)
-        rows = []
-        for i in range(0, len(data), entry_bytes):
-            chunk = data[i : i + entry_bytes]
-            rows.append("\t\t" + ", ".join(f"0x{b:02X}" for b in chunk) + ",")
-        entries.append("\t{\n" + "\n".join(rows) + "\n\t},")
-
-    total = DIGIT_W * DIGIT_H // 8
-    c_lines.append(f"const uint8_t font_digits[10][{total}] = {{")
-    c_lines.extend(entries)
-    c_lines.append("};")
-    c_lines.append("")
-
-    colon_data = pattern_to_bytes(colon_pat, COLON_W)
-    colon_total = COLON_W * COLON_H // 8
-    colon_rows = []
-    ceb = COLON_W // 8
-    for i in range(0, len(colon_data), ceb):
-        chunk = colon_data[i : i + ceb]
-        colon_rows.append("\t" + ", ".join(f"0x{b:02X}" for b in chunk) + ",")
-    c_lines.append(f"const uint8_t font_colon[{colon_total}] = {{")
-    c_lines.extend(colon_rows)
-    c_lines.append("};")
-    c_lines.append("")
-
-    return "\n".join(h_lines), "\n".join(c_lines)
-
-
-if __name__ == "__main__":
-    header, source = main()
-    with open("src/fonts.h", "w") as f:
-        f.write(header)
-    with open("src/fonts.c", "w") as f:
-        f.write(source)
-    print(f"Generated fonts.h ({len(header)} bytes) and fonts.c ({len(source)} bytes)")
-    print(f"Digit size: {DIGIT_W}x{DIGIT_H} = {DIGIT_W * DIGIT_H // 8} bytes each")
-    print(f"Colon size: {COLON_W}x{COLON_H} = {COLON_W * COLON_H // 8} bytes")