Re: [Tcllib-devel] would it be possible to extend crc16 in tcllib

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Hello Markus,

We can certainly add this to the Tcl library, but what is lacking is a description and test cases. Could you supply these too? (I am not an expert on these CRC methods, so I am utterly unable to judge the code or to help out with the specific test cases 😊).

Regards,

Arjen

From: mar...@we... <mar...@we...>
Sent: Wednesday, November 8, 2023 12:05 PM
To: tcl...@li...
Subject: [Tcllib-devel] would it be possible to extend crc16 in tcllib

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Hi,

i use a rs485 converter to read serial data from a solar inverters and a electricity meter. crc16 is used to check the transmission.
these methods are currently available in tcllib:
# CRC16: 0xBB3D
# CRC-CCITT: 0x29B1
# XMODEM: 0x31C3
# CRC-32: 0xCBF43926

however, other crc codes are used. would it be possible to extend crc16 with these codes in tcllib 1.21 and above?
#   KERMIT:    0x2189
#   MODBUS:    0x4B37
#   MCRF4XX:   0x6F91
#   GENIBUS:   0xD64E
#   X.25:      0x906E
#   SDLC:      0x906E
#   USB:       0xB4C8
#   BUYPASS:   0xFEE8
#   UMTS:      0xFEE8
#   GSM:       0xCE3C
#   MAXIM:     0x44C2
#   CMS:       0xAEE7

See table Appendix A in http://reveng.sourceforge.net/crc-catalogue/all.htm

i have integrated these changes into the tcllib1.21/crc/crc16.tcl file, but they are overwritten with every new update.
For example, i have attached the extended file. all places where a change was made were marked with MMMMMM

best regards
markus ort

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