8 replies to this topic

[Wouter]

VI Name:
CRC32

Total VIs:
3

Description:
I was suprised LabVIEW didn't had the CRC32. So I made it, http://en.wikipedia....edundancy_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?

Attached Files

•  crc32.vi   11.51K   201 downloads
•  crc32 (Element).vi   6.09K   155 downloads
•  crc32 (String).vi   6.97K   179 downloads

[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

Attached Files

•  crc16 CCITT (0xFFFF).vi   11.11K   72 downloads
•  crc16 CCITT (0x1D0F).vi   10.58K   59 downloads
•  crc16 CCITT (0x0000).vi   10.53K   62 downloads

[crelf]

Here's an existing colleciton of CRC functions: http://forums.ni.com...tion/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)

Attached Files

•  crc16 IBM.vi   10.3K   75 downloads

[Wouter]

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

Some reading material:
http://en.wikipedia....edundancy_check
http://www.pvlteam.c...c/crc/algos.htm
http://www.miscel.dk...lculations.html
http://web.archive.o...icles/ccitt.htm

Attached Files

•  crc.zip   128.41K   129 downloads

[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.

Attached Files

•  CRC.llb   84.03K   66 downloads