modbus support

lib/ModbusMaster/src/util/word.h

@@ -0,0 +1,64 @@
+/**
+@file
+Utility Functions for Manipulating Words
+
+@defgroup util_word "util/word.h": Utility Functions for Manipulating Words
+@code#include "util/word.h"@endcode
+
+This header file provides utility functions for manipulating words.
+
+*/
+/*
+
+  word.h - Utility Functions for Manipulating Words
+
+  This file is part of ModbusMaster.
+
+  ModbusMaster is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  ModbusMaster is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with ModbusMaster.  If not, see <http://www.gnu.org/licenses/>.
+
+  Written by Doc Walker (Rx)
+  Copyright © 2009-2015 Doc Walker <4-20ma at wvfans dot net>
+
+*/
+
+
+#ifndef _UTIL_WORD_H_
+#define _UTIL_WORD_H_
+
+
+/** @ingroup util_word
+    Return low word of a 32-bit integer.
+
+    @param uint32_t ww (0x00000000..0xFFFFFFFF)
+    @return low word of input (0x0000..0xFFFF)
+*/
+static inline uint16_t lowWord(uint32_t ww)
+{
+  return (uint16_t) ((ww) & 0xFFFF);
+}
+
+
+/** @ingroup util_word
+    Return high word of a 32-bit integer.
+
+    @param uint32_t ww (0x00000000..0xFFFFFFFF)
+    @return high word of input (0x0000..0xFFFF)
+*/
+static inline uint16_t highWord(uint32_t ww)
+{
+  return (uint16_t) ((ww) >> 16);
+}
+
+
+#endif /* _UTIL_WORD_H_ */