Initial commit: Pico serial echo with BOOTSEL reboot

load.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -e
+
+BUILDDIR="$(dirname "$0")/build"
+
+echo "Building..."
+make -C "$BUILDDIR"
+
+DEV=$(ls /dev/cu.usbmodem* 2>/dev/null | head -1)
+if [ -n "$DEV" ]; then
+    echo "Sending 'b' to $DEV to enter BOOTSEL mode..."
+    printf 'b' > "$DEV"
+    sleep 2
+fi
+
+echo "Loading firmware..."
+picotool load -f "$BUILDDIR/picomap.uf2"
+
+echo "Rebooting..."
+picotool reboot || true
+
+echo "Done."