Ring buffer fixes and spark time compute

STM32/CM7/Core/Src/ring_buffer.c

@@ -6,17 +6,17 @@
 #include <ring_buffer.h>
 #include <stdbool.h>
 
-void ringBufferPush(ring_buffer_t *rb, uint32_t value) {
+void ringBufferPush(volatile ring_buffer_t *rb, uint32_t value) {
   rb->buffer[rb->w_head] = value;
   rb->w_head++;
   return;
 }
 
-uint32_t ringBufferRead(ring_buffer_t *rb, uint8_t idx) {
-  return rb->buffer[rb->w_head - 1 - idx];
+uint32_t ringBufferRead(volatile ring_buffer_t *rb, uint8_t neg_idx) {
+  return rb->buffer[rb->w_head - 1 - neg_idx];
 }
 
-void ringBufferRevert(ring_buffer_t *rb, uint8_t val) {
+void ringBufferRevert(volatile ring_buffer_t *rb, uint8_t val) {
   rb->w_head -= val;
   return;
 }