Ring buffer impl

Implemented ring buffer with inline push and pop functions
Updated copyrights on main.c and ring_buffer files

STM32/CM7/Core/Src/ring_buffer.c

@@ -0,0 +1,28 @@
+// Copyright (C) 2026 Hector van der Aa <hector@h3cx.dev>
+// Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <assert.h>
+#include <ring_buffer.h>
+#include <stdbool.h>
+
+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;
+}