Move macros, add ENABLED/DISABLED, add includes

Marlin/macros.h

@@ -0,0 +1,25 @@
+#ifndef MACROS_H
+#define MACROS_H
+
+// Macros for bit masks
+#define BIT(b) (1<<(b))
+#define TEST(n,b) (((n)&BIT(b))!=0)
+#define SET_BIT(n,b,value) (n) ^= ((-value)^(n)) & (BIT(b))
+
+// Macros for maths shortcuts
+#define RADIANS(d) ((d)*M_PI/180.0)
+#define DEGREES(r) ((r)*180.0/M_PI)
+
+// Macros to contrain values
+#define NOLESS(v,n) do{ if (v < n) v = n; }while(0)
+#define NOMORE(v,n) do{ if (v > n) v = n; }while(0)
+
+// Macros to support option testing
+#define _CAT(a, ...) a ## __VA_ARGS__
+#define SWITCH_ENABLED_0 0
+#define SWITCH_ENABLED_1 1
+#define SWITCH_ENABLED_  1
+#define ENABLED(b) _CAT(SWITCH_ENABLED_, b)
+#define DISABLED(b) (!_CAT(SWITCH_ENABLED_, b))
+
+#endif //__MACROS_H