Move build.sh and flash.sh to repo root as shared scripts

build.sh runs inside Docker (mounted at /scripts/build.sh via
docker-compose volume). flash.sh runs on the host and takes the
project name as an argument, auto-detecting the .uf2 file.

Usage:
  cd color_switcher && docker compose run --rm pico-build bash /scripts/build.sh
  cd .. && ./flash.sh color_switcher

README.md

@@ -39,9 +39,9 @@ Each project is independent. To work on one, `cd` into its folder:
 
 ```bash
 cd color_switcher/
-docker compose build                                  # first time only
-docker compose run --rm pico-build bash build.sh      # compile
-./flash.sh                                            # flash (hold BOOTSEL + plug in)
+docker compose build                                          # first time only
+docker compose run --rm pico-build bash /scripts/build.sh     # compile
+cd .. && ./flash.sh color_switcher                            # flash (hold BOOTSEL + plug in)
 ```
 
 See each project's own `README.md` for project-specific instructions.
@@ -68,8 +68,10 @@ pico/
 │   ├── src/                     # project-specific components (APP_CLSW, SYS_ECU)
 │   ├── Dockerfile               # containerized ARM cross-compilation
 │   ├── docker-compose.yml
-│   ├── build.sh / flash.sh
+│   └── docker-compose.yml
 │   └── CLAUDE.md / README.md
+├── build.sh                     # shared build script (runs inside Docker)
+├── flash.sh                     # shared flash script (runs on host macOS)
 ├── .gitmodules
 ├── CLAUDE.md
 └── README.md                    # this file

build.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# ============================================================================
+# build.sh — Build Pico firmware for a given project
+# ============================================================================
+# Runs inside Docker. CMake source directory is the project's cmake/ folder.
+# Build artifacts (including the .uf2) land in the project's build/ folder.
+#
+# Usage (from inside Docker container):
+#   bash /scripts/build.sh
+#
+# The script auto-detects the project directory from the Docker working
+# directory (/project), so no arguments are needed.
+# ============================================================================
+
+set -e
+
+# Configure: cmake/ holds the CMakeLists.txt, build/ holds the output
+cmake -S cmake -B build
+
+# Compile using all available CPU cores
+cmake --build build -j"$(nproc)"

color_switcher/build.sh

@@ -1,25 +0,0 @@
-#!/bin/bash
-
-# Build script for the Pico firmware.
-# Creates an out-of-source build directory to keep generated files
-# separate from the project source code.
-#
-# Directory layout expected at project root:
-#   cmake/          - all build-system files (CMakeLists.txt + cmake_config/)
-#   src/            - application source code
-#   build/          - created by this script, holds all CMake/Make output
-#
-# Using -S and -B lets us point CMake at the cmake/ source folder while
-# keeping the build artifacts in a sibling build/ folder at the project root.
-
-# Fail fast on any error so a broken configure step doesn't silently lead
-# to a confusing make error further down.
-set -e
-
-# Configure the build: tell CMake the source directory is cmake/ and the
-# binary (build) directory is build/. CMake will create build/ if needed.
-cmake -S cmake -B build
-
-# Compile everything using all available CPU cores. The final output is a
-# .uf2 file in build/ that can be dragged onto the Pico's USB mass storage.
-cmake --build build -j"$(nproc)"

color_switcher/cmake/cmake_config/mcu_config.cmake

@@ -97,7 +97,7 @@ function(mcu_link_target target)
     # When running inside Docker, the target will fail with a clear error
     # from flash.sh ("not found" or "/Volumes/RPI-RP2 not accessible").
     add_custom_target(flash
-        COMMAND bash ${PROJECT_ROOT_DIR}/flash.sh
+        COMMAND bash ${PROJECT_ROOT_DIR}/../flash.sh ${PROJECT_NAME}
         DEPENDS ${target}
         WORKING_DIRECTORY ${PROJECT_ROOT_DIR}
         COMMENT "Flashing firmware to Pico via USB mass storage"

color_switcher/docker-compose.yml

@@ -28,6 +28,7 @@ services:
     volumes:
       - .:/project
       - ../common:/common
+      - ../build.sh:/scripts/build.sh
 
     # Keep the container alive indefinitely. We intentionally do NOT run the
     # build on startup - `sleep infinity` lets the container stay up so it can

color_switcher/flash.sh

@@ -1,46 +0,0 @@
-#!/bin/bash
-
-# ============================================================================
-# flash.sh - Flash firmware to the Raspberry Pi Pico
-# ============================================================================
-# This script MUST run on the host macOS (not inside Docker) because it
-# needs access to /Volumes/RPI-RP2, the USB mass storage mount point that
-# appears when the Pico is held in BOOTSEL mode during power-on.
-#
-# Usage:
-#   1. Hold BOOTSEL on the Pico and plug it into USB
-#   2. Run: ./flash.sh
-#
-# Or chain with a build:
-#   docker compose run --rm pico-build bash build.sh && ./flash.sh
-# ============================================================================
-
-PICO_MOUNT="/Volumes/RPI-RP2"
-UF2_FILE="build/Color_Switcher_PICO.uf2"
-
-# Verify the firmware file exists before waiting for the Pico
-if [ ! -f "$UF2_FILE" ]; then
-    echo "Error: $UF2_FILE not found. Run the build first:"
-    echo "  docker compose run --rm pico-build bash build.sh"
-    exit 1
-fi
-
-# Wait for the Pico to appear in BOOTSEL mode
-echo "Waiting for Pico in BOOTSEL mode ($PICO_MOUNT)..."
-echo "  -> Hold BOOTSEL and plug in the Pico via USB"
-while [ ! -d "$PICO_MOUNT" ]; do
-    sleep 0.5
-done
-
-# Copy the firmware to the Pico's USB mass storage
-echo "Pico detected. Copying $UF2_FILE..."
-cp "$UF2_FILE" "$PICO_MOUNT/"
-
-# Wait for the Pico to unmount (it reboots automatically after receiving the .uf2)
-echo "Waiting for Pico to reboot..."
-while [ -d "$PICO_MOUNT" ]; do
-    sleep 0.5
-done
-
-echo "Done! Pico rebooted with new firmware."
-echo "  -> Open a serial monitor: screen /dev/tty.usbmodem* 115200"

flash.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+
+# ============================================================================
+# flash.sh — Flash Pico firmware for a given project
+# ============================================================================
+# Runs on the HOST macOS (not inside Docker) because it needs access to
+# /Volumes/RPI-RP2, the USB mass storage mount that appears when the Pico
+# is held in BOOTSEL mode.
+#
+# Usage:
+#   ./flash.sh <project>
+#
+# Example:
+#   ./flash.sh color_switcher
+#
+# The script finds the .uf2 file in the project's build/ directory
+# automatically — no hardcoded firmware name needed.
+# ============================================================================
+
+set -e
+
+# --- Validate arguments ---
+PROJECT="${1:?Usage: ./flash.sh <project>   (e.g., ./flash.sh color_switcher)}"
+
+# Resolve paths relative to this script's location (the repo root)
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+BUILD_DIR="$SCRIPT_DIR/$PROJECT/build"
+PICO_MOUNT="/Volumes/RPI-RP2"
+
+# --- Find the .uf2 file ---
+UF2_FILE=$(find "$BUILD_DIR" -maxdepth 1 -name "*.uf2" 2>/dev/null | head -1)
+
+if [ -z "$UF2_FILE" ]; then
+    echo "Error: No .uf2 file found in $BUILD_DIR"
+    echo "  Run the build first:"
+    echo "    cd $PROJECT && docker compose run --rm pico-build bash /scripts/build.sh"
+    exit 1
+fi
+
+echo "Firmware: $UF2_FILE"
+
+# --- Wait for the Pico in BOOTSEL mode ---
+echo "Waiting for Pico in BOOTSEL mode ($PICO_MOUNT)..."
+echo "  -> Hold BOOTSEL and plug in the Pico via USB"
+while [ ! -d "$PICO_MOUNT" ]; do
+    sleep 0.5
+done
+
+# --- Copy the firmware ---
+echo "Pico detected. Copying $(basename "$UF2_FILE")..."
+cp "$UF2_FILE" "$PICO_MOUNT/"
+
+# --- Wait for reboot ---
+echo "Waiting for Pico to reboot..."
+while [ -d "$PICO_MOUNT" ]; do
+    sleep 0.5
+done
+
+echo "Done! Pico rebooted with new firmware."
+echo "  -> Open a serial monitor: screen /dev/tty.usbmodem* 115200"