Merge pull request #60 from UAVCAN/bendyer-half-nostdlib

Use public domain half<->float routines which dependence on math functions in C stdlib

libuavcan/include/uavcan/build_config.hpp

@@ -143,6 +143,14 @@
 # define UAVCAN_USE_EXTERNAL_SNPRINTF   0
 #endif
 
+/**
+ * Allows the user's application to provide a custom implementation of IEEE754Converter::nativeIeeeToHalf and
+ * IEEE754Converter::halfToNativeIeee.
+ */
+#ifndef UAVCAN_USE_EXTERNAL_FLOAT16_CONVERSION
+# define UAVCAN_USE_EXTERNAL_FLOAT16_CONVERSION 0
+#endif
+
 /**
  * Run time checks.
  * Resolves to the standard assert() by default.