Initial sync implementation

Implemented system sync with crank and cam state and simple error
handling

STM32/CM7/Core/Inc/macros.h

@@ -0,0 +1,13 @@
+// Copyright (C) 2026 Hector van der Aa <hector@h3cx.dev>
+// Copyright (C) 2026 Pierre Barbier <pierrebarbier741@gmail.com>
+// Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifdef DEBUG
+#include "SEGGER_RTT.h"
+#define DEBUG_LOG(fmt, ...) SEGGER_RTT_printf(0, fmt "\n", ##__VA_ARGS__)
+#else
+#define DEBUG_LOG(fmt, ...)                                                    \
+  do {                                                                         \
+  } while (0)
+#endif