Passthrough version

2026-07-07 11:54:46 +10:00
parent 13881ae6c6
commit ba0f775bb9
3 changed files with 108 additions and 0 deletions
@@ -0,0 +1,76 @@
+// 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_passthrough.ino
+ * @brief Minimal firmware: keeps the Maths CPU powered on and provides
+ *        bidirectional raw serial passthrough to the Iridium modem.
+ *
+ * The AVR becomes a transparent bridge between the USB console and the
+ * Iridium 9602/9603 modem (Serial3 @ 19200 baud). AT commands typed on
+ * the console go directly to the modem; modem responses are echoed back.
+ *
+ * Maths CPU (Raspberry Pi) is kept alive indefinitely via the hold timer
+ * and the MATHS_RETURNLINE hardware signal.
+ *
+ * Build (PlatformIO):
+ *   pio run -e wii5_passthrough
+ */
+
+#include <Arduino.h>
+#include <WII5.h>
+
+elapsedMillis wdtWait;
+elapsedMillis holdCheckWait;
+
+void setup() {
+  wii5Setup.beginSafe();
+  wii5Setup.setupConsole();
+
+  // Maths CPU — start and hold on indefinitely
+  wii5Maths.begin();
+  wii5Maths.start(WII5MATHSMODE_COMMS);
+  wii5Maths.setHold(MATHS_MAXHOLD);
+  wii5Maths.setReturnLine();
+
+  // Iridium modem — initialise, then power on with passthrough
+  wii5Iridium.begin();
+  wii5Iridium.setPassthrough(true);
+  wii5Iridium.powerOn(true);
+
+  wdtWait = 0;
+  holdCheckWait = 0;
+}
+
+void loop() {
+  // ---- external watchdog ----
+#ifdef WDT_RESET
+  if (wdtWait > 5100) {
+    digitalWrite(WDT_RESET, LOW);
+    wdtWait = 0;
+  } else if (wdtWait > 5000) {
+    digitalWrite(WDT_RESET, HIGH);
+  }
+#endif
+
+  // ---- Maths CPU keep-alive ----
+  wii5Maths.loop();
+  if (holdCheckWait > 30000) {
+    holdCheckWait = 0;
+    if (wii5Maths.remainingHold() < 600) {
+      wii5Maths.setHold(MATHS_MAXHOLD);
+    }
+    wii5Maths.setReturnLine();
+  }
+
+  // ---- Modem → Console (passthrough echo) ----
+  wii5Iridium.WII5SerialManager::loop();
+
+  // ---- Console → Modem (raw forwarding) ----
+  while (SerialConsole.available()) {
+    SerialComms.write(SerialConsole.read());
+  }
+}