Updated ring buffer

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

STM32/CM7/CMakeLists.txt

@@ -59,6 +59,7 @@ target_include_directories(${CMAKE_PROJECT_NAME} PRIVATE
 # Add sources to executable
 target_sources(${CMAKE_PROJECT_NAME} PRIVATE
     # Add user sources here
+    Core/Src/ring_buffer.c
 )
 
 # Link directories setup

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);

STM32/CM7/Core/Src/ring_buffer.c

@@ -9,20 +9,9 @@
 inline void ringBufferPush(ring_buffer_t *rb, uint32_t value) {
   rb->buffer[rb->w_head] = value;
   rb->w_head++;
-  if (rb->w_head == rb->r_head) {
-    // if write head catches up to read head, crash program as consumer task
-    // should keep up with write head
-    assert(false);
-  }
   return;
 }
 
-inline int ringBufferPop(ring_buffer_t *rb, uint32_t *output) {
-  if (rb->w_head == rb->r_head) {
-    // if read head is at write head, buffer is empty so nothing to pop
-    return 1;
-  }
-  *output = rb->buffer[rb->r_head];
-  rb->r_head++;
-  return 0;
+inline uint32_t ringBufferRead(ring_buffer_t *rb, uint8_t idx) {
+  return rb->buffer[rb->w_head - 1 - idx];
 }