b673fb4d5c
* Add and remove libs and components for Arduino Core 3 * Add back NimBLE-Arduino in resources
95 lines
3.3 KiB
C++
95 lines
3.3 KiB
C++
//-------------------------------------------------------------------------------------
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// CRC16 support class
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// Based on various examples found on the web
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// Copyright (C) 2014 Vincenzo Mennella (see license.txt)
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// History
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// 0.1.0 31/05/2014: First public code release
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// 0.1.1 17/12/2014: Minor revision and commented code
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// 0.1.2 06/06/2019: Fix reflect routine for 16 bit data
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// Added ModBus and Mcrf4XX inline functions
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//
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// License
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// "MIT Open Source Software License":
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in the
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// Software without restriction, including without limitation the rights to use, copy,
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// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//-------------------------------------------------------------------------------------
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#ifndef CRC16_H
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#define CRC16_H
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#define LIBRARY_VERSION_CRC16_H "0.1.2"
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#if defined(ARDUINO) && ARDUINO >= 100
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#include "Arduino.h"
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#elif defined(ARDUINO)
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#include "WProgram.h"
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#else
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#include <cstdint>
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#endif
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class Crc16
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{
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private:
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//Crc parameters
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uint16_t _msbMask;
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uint16_t _mask;
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uint16_t _xorIn;
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uint16_t _xorOut;
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uint16_t _polynomial;
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uint8_t _reflectIn;
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uint8_t _reflectOut;
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//Crc value
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uint16_t _crc;
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uint8_t reflect(uint8_t data);
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uint16_t reflect(uint16_t data);
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public:
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Crc16()
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{
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//Default to XModem parameters
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_reflectIn = false;
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_reflectOut = false;
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_polynomial = 0x1021;
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_xorIn = 0x0000;
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_xorOut = 0x0000;
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_msbMask = 0x8000;
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_mask = 0xFFFF;
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_crc = _xorIn;
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}
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Crc16(uint8_t reflectIn, uint8_t reflectOut, uint16_t polynomial, uint16_t xorIn, uint16_t xorOut, uint16_t msbMask, uint16_t mask)
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{
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_reflectIn = reflectIn;
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_reflectOut = reflectOut;
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_polynomial = polynomial;
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_xorIn = xorIn;
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_xorOut = xorOut;
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_msbMask = msbMask;
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_mask = mask;
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_crc = _xorIn;
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}
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void clearCrc();
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void updateCrc(uint8_t data);
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uint16_t getCrc();
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unsigned int fastCrc(uint8_t data[], uint8_t start, uint16_t length, uint8_t reflectIn, uint8_t reflectOut, uint16_t polynomial, uint16_t xorIn, uint16_t xorOut, uint16_t msbMask, uint16_t mask);
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unsigned int XModemCrc(uint8_t data[], uint8_t start, uint16_t length);
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unsigned int Mcrf4XX(uint8_t data[], uint8_t start, uint16_t length);
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unsigned int Modbus(uint8_t data[], uint8_t start, uint16_t length);
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};
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#endif
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