Add serial XON/XOFF handshaking

From @ejtagle, originally #7459
2017-10-02 02:47:30 -05:00
parent af15383578
commit 508d764d63
6 changed files with 279 additions and 104 deletions
--- a/Marlin/src/core/macros.h
+++ b/Marlin/src/core/macros.h
@ -106,6 +106,7 @@
 #define CIRCLE_CIRC(R) (2.0 * M_PI * (R))

 #define SIGN(a) ((a>0)-(a<0))
+#define IS_POWER_OF_2(x) ((x) && !((x) & ((x) - 1)))

 // Macros to contrain values
 #define NOLESS(v,n) do{ if (v < n) v = n; }while(0)