* Improve uart dma ring buffer. Sending dma still missing

* Add digio module for controlling LEDs, Loudspeaker, and the Digital IOs
* General code improvements

stm-firmware/include/helper-macros/helper-macros.h

@@ -0,0 +1,14 @@
+#ifndef __HELPER_MACROS_H__
+#define __HELPER_MACROS_H__
+
+#include <stddef.h>
+
+#define xstr(x) str(x)
+#define str(x) #x
+
+#define CONCATX(x,y) CONCAT(x,y)
+#define CONCAT(x,y) x##y
+
+#define COUNT_OF(x) ((sizeof(x)/sizeof(0[x])) / ((size_t)(!(sizeof(x) % sizeof(0[x])))))
+
+#endif /* __HELPER_MACROS_H__ */