checksum.h
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00001 //=================================================================================================
00002 // Copyright (c) 2012, Johannes Meyer, TU Darmstadt
00003 // All rights reserved.
00004 
00005 // Redistribution and use in source and binary forms, with or without
00006 // modification, are permitted provided that the following conditions are met:
00007 //     * Redistributions of source code must retain the above copyright
00008 //       notice, this list of conditions and the following disclaimer.
00009 //     * Redistributions in binary form must reproduce the above copyright
00010 //       notice, this list of conditions and the following disclaimer in the
00011 //       documentation and/or other materials provided with the distribution.
00012 //     * Neither the name of the Flight Systems and Automatic Control group,
00013 //       TU Darmstadt, nor the names of its contributors may be used to
00014 //       endorse or promote products derived from this software without
00015 //       specific prior written permission.
00016 
00017 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
00018 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00019 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00020 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
00021 // DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
00022 // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
00023 // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
00024 // ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00025 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00026 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027 //=================================================================================================
00028 
00029 #ifndef UBLOX_MSGS_CHECKSUM_H
00030 #define UBLOX_MSGS_CHECKSUM_H
00031 
00032 #include <stdint.h>
00033 
00034 namespace ublox {
00035 
00036 static inline void calculateChecksum(const uint8_t *data, uint32_t size, uint8_t &ck_a, uint8_t &ck_b) {
00037   ck_a = 0; ck_b = 0;
00038   for(uint32_t i = 0; i < size; ++i)
00039   {
00040     ck_a = ck_a + data[i];
00041     ck_b = ck_b + ck_a;
00042   }
00043 }
00044 
00045 static inline uint16_t calculateChecksum(const uint8_t *data, uint32_t size, uint16_t &checksum) {
00046   uint8_t *byte = reinterpret_cast<uint8_t *>(&checksum);
00047   calculateChecksum(data, size, byte[0], byte[1]);
00048   return checksum;
00049 }
00050 
00051 } // namespace ublox
00052 
00053 #endif // UBLOX_MSGS_CHECKSUM_H


ublox_serialization
Author(s): Johannes Meyer
autogenerated on Mon Oct 6 2014 08:16:37