Ring buffer impl

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

STM32/CM7/Core/Inc/ring_buffer.h

@@ -0,0 +1,14 @@
+// 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 <stdint.h>
+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);