Updated ring buffer

Updated ring buffer to match use case, one write head with negative read
index

STM32/CM7/Core/Inc/ring_buffer.h

@@ -6,9 +6,8 @@
 typedef struct ring_buffer_t {
   uint32_t buffer[256];
   uint8_t w_head;
-  uint8_t r_head;
 } ring_buffer_t;
 
 inline void ringBufferPush(ring_buffer_t *rb, uint32_t value);
 
-inline int ringBufferPop(ring_buffer_t *rb, uint32_t *output);
+inline uint32_t ringBufferRead(ring_buffer_t *rb, uint8_t idx);