crc_calc | A calculator for the UK Carbon Reduction Commitment | Development Tools library

by AMEE Ruby Version: Current License: No License

X-Ray Key Features Code Snippets Community Discussions(4)Vulnerabilities Install Support

kandi X-RAY | crc_calc Summary

crc_calc is a Ruby library typically used in Utilities, Development Tools applications. crc_calc has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

Copyright: 2010 AMEE UK Limited.

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Security

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Support

crc_calc has a low active ecosystem.

It has 4 star(s) with 0 fork(s). There are 3 watchers for this library.

It had no major release in the last 6 months.

crc_calc has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of crc_calc is current.

Quality

crc_calc has no bugs reported.

Security

crc_calc has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

crc_calc does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

crc_calc releases are not available. You will need to build from source code and install.

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crc_calc Key Features

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crc_calc Examples and Code Snippets

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Community Discussions

Trending Discussions on crc_calc

Implementing a CRC algorithm

How to calculate CRC16-CCITT/KERMIT in both C# and C

How to apply xmodem CRC on generating and checking

CRC16 generation & verification

QUESTION

Implementing a CRC algorithm

Asked 2021-Jan-28 at 08:44

I'm trying to implement a CRC algorithm as defined in some video interface standards:

The raw data is 10 bit words that are squashed into 8 bit bytes which I have no issues extracting and working with in numpy.

the CRC has polynomial:

...

ANSWER

Answered 2021-Jan-28 at 08:44

The CRC calculation must be done reflected. (Clue in note on Table 9: "NOTE – CRC0 is the MSB of error detection codes.")

This C routine checks the CRCs in your example correctly:

Source https://stackoverflow.com/questions/65922806

QUESTION

How to calculate CRC16-CCITT/KERMIT in both C# and C

Asked 2019-Sep-11 at 17:21

I am working on calculating a CRC16-CCITT/KERMIT so that I can check data integrity on transmissions of 64-byte data packets between a C# Winforms Application and a microcontroller (PSoC5LP/Arm Cortex-M3). I'm close, but just not quite getting the CRC calculation to line up between the two and having a tough time figuring out why. The example data packet I am calculating the CRC for is:

02 03 01 02 03 04 05 07 08 09 0A 0B 00 00 06 0E 0C 0D 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

The CRC for this packet comes out to 0x4D8C in both my Winforms application as well as for this online CRC calculator

Since these line up, I'm assuming the calculation in the C# calculation is legit. Regardless, here's the code. Pulled from this page with the only change being the I hardcoded the polynomial (0x8408):

...

ANSWER

Answered 2019-Sep-11 at 17:14

Of course I get it less than 10 minutes after posting the question (isn't that always how it goes?)

The C code I thought was for CRC-16/KERMIT looks to actually be CRC-16/X-25. I think I got confused because the question I took the code from the answer of was asking about KERMIT, but the answer says it's X-25.

Removing the bitwise invert of crc at the start of the function:

Source https://stackoverflow.com/questions/57893261

QUESTION

How to apply xmodem CRC on generating and checking

Asked 2018-Jul-07 at 02:51

I've iterated of lots of articles - for some reason I couldn't find any which describes what must be a simple procedure: How to combine a calculated CRC with the original message, so that calculating CRC again results in 0 (=checks out as correct)? I did find several examples with 'longhand' calculations (only 2 or 3 bit CRCs), but no example which uses a library function such as [crcmod][1] (Python library).

Here's a simple program I wrote to check it out:

...

ANSWER

Answered 2018-Jul-06 at 07:28

crc_calc.update(new_msg) adds the entire content of new_msg to the CRC. Since crc_calc already holds the result of 313233343536373839, you are effectively calculating the CRC of 31323334353637383931323334353637383931c3 and this is indeed 00ef.

To add only the two bytes to the calculation, use

Source https://stackoverflow.com/questions/51202796

QUESTION

CRC16 generation & verification

Asked 2017-Jan-24 at 18:06

I'm trying to understand (and subsequently implement) the crc16 verification employed by the clean flight quadrocopter firmware for the srxl package verification.

SRXL is a simple Serial Protocol for transmitting servo values via a single serial line.

the package structure is like this:

the crc16 is verified by the following function:

...

ANSWER

Answered 2017-Jan-24 at 18:06

If a CRC is stored properly at the end of a message, it has the property that the CRC of the message and the concatenated CRC is a constant, assuming no errors. Depending on the definition of the CRC, that constant can be zero.

The reason is that a CRC is essentially the remainder of a polynomial division of the message times xⁿ, where n is the CRC length in bits. So when you add the CRC to the message, you are replacing those last n zeros with the remainder, resulting in the division of the whole thing having no remainder. (Note that the negative of a binary polynomial is that polynomial, since the exclusive-or of something with itself is zero.)

Yes, if you like you can instead compute the CRC on just the message, and then compare the result to the CRC appended to the message.

Source https://stackoverflow.com/questions/41828799

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install crc_calc

You can download it from GitHub.
On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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