Working (but still dev-mode; need some more different configurators)

F1:F103/BISS_C_encoders/ringbuffer.h

@@ -25,12 +25,14 @@
 #include <stm32f3.h>
 #endif
 
+#include <stdatomic.h>
+
 typedef struct{
     uint8_t *data;      // data buffer
     const int length;   // its length
     int head;           // head index
     int tail;           // tail index
-    volatile int busy; // == TRUE if buffer is busy now
+    volatile atomic_int busy; // == TRUE if buffer is busy now
 } ringbuffer;
 
 int RB_read(ringbuffer *b, uint8_t *s, int len);