CRC32

[Wouter]

VI Name:

CRC32

Total VIs:

3

Description:

I was suprised LabVIEW didn't had the CRC32. So I made it, http://en.wikipedia.org/wiki/Cyclic_redundancy_check, http://www.ietf.org/rfc/rfc1952.txt. It can take a array of U32, one element of U32 or a string. When needed I can create more CRC checks, CRC8, CRC16, etc... but CRC32 is the most used one I readed.

Note:

-

Blockdiagram:

What are you thoughts on this VI?

• Would you like to see such a function in OpenG?
  
• Can you optimize the code?
  
• In which package should it be included?
  
• Should it be rejected?
  

crc32.vi

crc32 (Element).vi

crc32 (String).vi

[jgcode]

Yer, these could be nice to have in OpenG.

*I think* this is the CRC16 I have used in the past.

[Ton Plomp]

Hi Wouter,

that looks nice, I think we should include it in the MD5 package (together with the SHA hashes I've created).

However I would use an array of U8 instead of U32.

Ton

[Wouter]

@Ton, in the rfc1952 they even use unsigned long. So I would earlier change it to u64 then u8

[Wouter]

crc16 CCITT

crc16 CCITT (0xFFFF).vi

crc16 CCITT (0x1D0F).vi

crc16 CCITT (0x0000).vi

[crelf]

Here's an existing colleciton of CRC functions: http://forums.ni.com/t5/LabVIEW/Checksum-calculation/td-p/86249

[Wouter]

crc16-IBM

CRC-16-IBM x¹⁶ + x¹⁵ + x² + 1 (Bisync, Modbus, USB, ANSI X3.28, many others; also known as CRC-16 and CRC-16-ANSI)

crc16 IBM.vi

[Wouter]

Poly VI with CRC8, CRC16-CCITT (0x000, 0x1D0F, 0xFFFF), CRC-IBM, CRC32

Some reading material:

http://en.wikipedia.org/wiki/Cyclic_redundancy_check

http://www.pvlteam.com/doc/crc/algos.htm

http://www.miscel.dk/MiscEl/CRCcalculations.html

http://web.archive.org/web/20071221025748/http://www.joegeluso.com/software/articles/ccitt.htm

crc.zip

[crossrulz]

Here's a few generic CRC VIs I made sometime over the years. They do not use the lookup tables, so they may be a little slower. But they can be set to any CRC configuration.

Included are an 8-bit, 16-bit, and 32-bit versions.

CRC.llb

[rspenze]

Someone maybe send a CRC16-CCITT 0x1021, poly x16+x15+x2+1 labbview 2009

[crossrulz]

Here is my 16-bit CRC saved in 2009.

16-bit CRC.vi

[Олег Швыдюк]

On 05.10.2012 at 8:58 PM, crossrulz said:

Here's a few generic CRC VIs I made sometime over the years. They do not use the lookup tables, so they may be a little slower. But they can be set to any CRC configuration.

Included are an 8-bit, 16-bit, and 32-bit versions.

CRC.llb

Thanks!