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.

test/wii5_sparton/wii5_sparton.ino

@@ -0,0 +1,64 @@
+// 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.
+
+/**
+ * @file wii5_sparton.ino
+ * @brief Test sketch: Sparton AHRS exercise.
+ */
+
+#include <WII5Sh3dConsole.h>
+#include <WII5.h>
+#include <WII5Sparton.h>
+
+void setup() {
+  Serial.begin(115200);
+  console.begin(WII5_BUFFER_CONSOLE_PRINT, WII5_BUFFER_CONSOLE_CMD);
+  console.add(&Serial);
+  console.printf(F("WII5: Test Sparton"));
+
+  wii5Sparton.begin();
+  wii5Sparton.setDebug(true);
+
+  wii5Sparton.setRecords(5000);
+  wii5Sparton.start();
+}
+
+void loop() {
+  wii5Sparton.loop();
+  console.loop();
+  if (console.available()) {
+    uint32_t val = console.getVal();
+    console.printf(F("CONSOLE: Got command %c=%d \r\n"),
+      console.getCommand(),
+      val
+    );
+    switch(console.getCommand()) {
+      // Toggle Sparton passthrough
+      case 'p':
+        console.log(LOG_DEBUG, F("SPARTON: 'p' passthrough toggle"));
+        wii5Sparton.setPassthrough(!wii5Sparton.getPassthrough());
+        break;
+
+      case 's':
+        if (val < 100) val = 100;
+        console.log(LOG_DEBUG, F("SPARTON: 's' start with %lu records"), val);
+        wii5Sparton.setRecords(val);
+        wii5Sparton.start();
+        break;
+
+      case 'S':
+        console.log(LOG_DEBUG, F("SPARTON: 'S' stop"));
+        wii5Sparton.stop();
+        break;
+
+      default:
+        break;
+    };
+    console.log(LOG_DEBUG, F("SPARTON: Status = %d"), wii5Sparton.getPassthrough());
+    wii5Sparton.displayStatus();
+    wii5Sparton.displayError();
+  }
+}