consistant naming for global_state and implemented

STM32/CM7/Core/Inc/global_state.h

@@ -0,0 +1,16 @@
+// 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
+
+#include <ring_buffer.h>
+typedef enum {
+  SYNC_OK,
+  SYNC_PENDING,
+  SYNC_NOT_OK
+} sync_state;
+
+typedef struct {
+    sync_state sync;
+    ring_buffer_t crank_RB;
+    ring_buffer_t cam_RB;
+} global_state_t;