it means " I changed value this way(Modbus: width=16 poly=0x8005 init=0xffff refin=true refout=true xorout=0x0000 check=0x4b37) but it did not calculate anything" it is not hard to get it. If you expect us to help, you've got to come up with something a lot less lame than "it did not work".Ĭool down Pauls. Kick its ass harder, and tell it to get to work. Reflect the data about the center bit. Uint8_t Crc16::reflect(uint8_t data, uint8_t bits) Unsigned int Crc16::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)Ĭrc = (unsigned int)((reflect(crc) ^ xorOut) & mask) CCITT-False: width=16 poly=0x1021 init=0xffff refin=false refout=false xorout=0x0000 check=0x29b1 Modbus: width=16 poly=0x8005 init=0xffff refin=true refout=true xorout=0x0000 check=0x4b37
#ARDUINO CRC16 MODBUS CODE#
Calculate generic crc code on data array _crc = (unsigned int)((reflect(_crc) ^ _xorOut) & _mask)
XModem parameters: poly=0x1021 init=0x0000 refin=false refout=false xorout=0x0000 Inline unsigned int XModemCrc(uint8_t data, uint8_t start, uint16_t length) 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) Inline Crc16(uint8_t reflectIn, uint8_t reflectOut, uint16_t polynomial, uint16_t xorIn, uint16_t xorOut, uint16_t msbMask, uint16_t mask) Uint8_t reflect(uint8_t data, uint8_t bits = 32)
#ARDUINO CRC16 MODBUS SOFTWARE#
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#ARDUINO CRC16 MODBUS FREE#
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0.1.1 : Minor revision and commented code Copyright (C) 2014 Vincenzo Mennella (see license.txt) Based on various examples found on the web I found a CRC-16 XModem library for arduino. This website is also capable to calculate CRC-32, but keep in mind, CRC-32 is NOT used in RTU modbus frames.
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