Ring buffer fixes and spark time compute

STM32/CM7/Core/Inc/global_state.h

@@ -6,6 +6,7 @@
 #include <stdint.h>
 
 #define MAX_CAM_MISS 2
+#define SPARK_ADVANCE 20
 
 typedef enum { SYNC_OK = 0, SYNC_PENDING = 1, SYNC_NOT_OK = 2 } sync_state_t;
 

STM32/CM7/Core/Inc/ring_buffer.h

@@ -8,8 +8,8 @@ typedef struct ring_buffer_t {
   uint8_t w_head;
 } ring_buffer_t;
 
-inline void ringBufferPush(ring_buffer_t *rb, uint32_t value);
+inline void ringBufferPush(volatile ring_buffer_t *rb, uint32_t value);
 
-inline uint32_t ringBufferRead(ring_buffer_t *rb, uint8_t idx);
+inline uint32_t ringBufferRead(volatile ring_buffer_t *rb, uint8_t neg_idx);
 
-inline void ringBufferRevert(ring_buffer_t *rb, uint8_t val);
+inline void ringBufferRevert(volatile ring_buffer_t *rb, uint8_t val);