Initial public release of WII5 Buoy firmware

Firmware for an autonomous wave-measurement buoy (ATmega2560-based
WII5 v2 board). Reads wave motion from a Sparton AHRS-M1/M2 IMU,
samples GPS and battery state, and reports back over Iridium SBD
satellite telemetry. Originally developed 2012-2024.

This is the first public release. Code, documentation, and field-tested
operating modes (Capture, Sleep, Position, ManualTest, SelfTest,
LowBattery) are licensed under Apache 2.0 — see LICENSE and NOTICE.

See README.md for an overview and build instructions, CONTRIBUTING.md
for how to contribute, and DEPLOYMENTS.md for the field-deployment log.

tools/2024/bootonly.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2012-2024 Scott Penrose <scottp@dd.com.au> and WII5 Buoy contributors
+#
+# This file is part of WII5 Buoy firmware.
+# See LICENSE for full terms.
+
+# Burn only the bootloader via ICSP (no application).
+: "${WII5_AVRDUDE:=avrdude}"
+
+"$WII5_AVRDUDE" \
+	-C./avrdude.conf \
+	-v \
+	-patmega2560 \
+	-cstk500v2 \
+	-Pusb \
+	-Ulock:w:0x0F:m \
+	-Uflash:w:optiboot_flash_atmega2560_UART0_230400_11059200L_BIGBOOT.hex