Add STM32 ring buffer driver

embedded/STM32/src/Drivers/ring_buffer.c

@@ -1,34 +1,50 @@
-#include "../../app/inc/common_defines.h"
-
-#define RING_BUF_SIZE   128U
-
-typedef struct ring_buffer_s
-{
-    uint32_t read_index;
-    uint32_t write_index;
-    uint8_t* buf;
-    uint32_t size;
-} ring_buffer_t;
+#include "ring_buffer.h"
 
 void ring_buffer_init(ring_buffer_t* rb, uint8_t* buf, uint32_t size)
 {
-
+    rb->buf = buf;
+    rb->size = size;
+    rb->read_index = 0U;
+    rb->write_index = 0U;
 
 }
 
-bool ring_buffer_read(ring_buffer_t* rb, uint8_t* byte)
+bool ring_buffer_empty(ring_buffer_t* rb)
 {
+    return (rb->read_index == rb->write_index);
+}
 
-
+static bool ring_buffer_full(ring_buffer_t* rb)
+{
+    return (((rb->write_index + 1U) % rb->size) == rb->read_index);
 }
 
+bool ring_buffer_read(ring_buffer_t* rb, uint8_t* byte)
+{
+    if (ring_buffer_empty(rb))
+    {
+        return false;
+    }
+
+    *byte = rb->buf[rb->read_index];
+    rb->read_index = (rb->read_index + 1U) % rb->size;
+
+    return true;
+}
+
 bool ring_buffer_write(ring_buffer_t* rb, uint8_t byte)
 {
-
-
+    if (ring_buffer_full(rb))
+    {
+        return false;
+    }
+
+    rb->buf[rb->write_index] = byte;
+    rb->write_index = (rb->write_index + 1U) % rb->size;
+
+    return true;
 }
 
-bool ring_buffer_empty(ring_buffer_t* rb)
-{
+ 
+
 
-}

embedded/STM32/src/Drivers/ring_buffer.h

@@ -0,0 +1,21 @@
+#ifndef RING_BUFFER_H
+#define RING_BUFFER_H
+
+#include "../../app/inc/common_defines.h"
+
+#define RING_BUF_SIZE   128U
+
+
+typedef struct ring_buffer_s {
+    uint32_t read_index;
+    uint32_t write_index;
+    uint8_t* buf;
+    uint32_t size;
+} ring_buffer_t;
+
+void ring_buffer_init(ring_buffer_t* rb, uint8_t* buf, uint32_t size);
+bool ring_buffer_read(ring_buffer_t* rb, uint8_t* byte);
+bool ring_buffer_write(ring_buffer_t* rb, uint8_t byte);
+bool ring_buffer_empty(ring_buffer_t* rb);
+
+#endif /* RING_BUFFER_H */