Initial sync implementation

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

STM32/CM7/Core/Inc/global_state.h

@@ -3,21 +3,27 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 #include <ring_buffer.h>
+#include <stdint.h>
+
+#define MAX_CAM_MISS 2
+
+typedef enum { SYNC_OK = 0, SYNC_PENDING = 1, SYNC_NOT_OK = 2 } sync_state_t;
+
 typedef enum {
-  SYNC_OK = 0,
-  SYNC_PENDING = 1,
-  SYNC_NOT_OK = 2
-} sync_state;
-typedef enum {
-  CYCLE_EXHAUST = 0,
-  CYCLE_INTAKE = 1,
-  CYCLE_COMPRESSION = 2,
-  CYCLE_COMBUSTION = 3,
+  CYCLE_COMBUSTION = 0,
+  CYCLE_EXHAUST = 1,
+  CYCLE_INTAKE = 2,
+  CYCLE_COMPRESSION = 3,
   CYCLE_UNKNOWN = 4
-} crank_state;
+} crank_state_t;
+
+typedef enum { CAM_IDLE = 0, CAM_TRIGD = 1 } cam_state_t;
+
 typedef struct {
-    crank_state cycle;
-    sync_state sync;
-    ring_buffer_t crank_RB;
-    ring_buffer_t cam_RB;
+  crank_state_t crank_state;
+  cam_state_t cam_state;
+  uint8_t cam_miss_ctr;
+  sync_state_t sync_state;
+  ring_buffer_t crank_RB;
+  ring_buffer_t cam_RB;
 } global_state_t;