CRC code generator

Code generates CRC code for any binary data stream & generator polynomial

Description

The standard polynomials are not used to make it more flexible.
User provide data stream and generator polynomial.

• Required Products: Communications Toolbox
• MATLAB release: MATLAB 7.0.4 (R14SP2)
• Other Files: crc9.m, ; license.txt

[Jos x@y.z]

How do ever expect someone to use this code succesfully if you do not provide any help whatsoever.

Moreover, this is a script that may override existing variables ...

[Ahmad Wazzi]

Easy to follow. For the previous comment, please understand how CRC is done and you will find the code straight forward. Code is self explanatory.

[daty daty]

I need CRC-32 in my simulations.
Should I take this script and change
the generator polynomial to find it ??

[sundas zahid]

yeah the code is good but but it can be modified as to the input can be made real time....

[Nicolas Vignale]

Daty Daty: Look at http://www.mathworks.com/support/solutions/files/s1-P6U4E/CRC.m

You can modify here the Polynom

[jef al]

your code can only work if the number of data streams are below 360 bits. any higher bits gives error. using GFCONV method works fine

[fred uit vosselaar]

good code works fine for me. thanks a lot

[mona sherdiwala]

 

[Mohsin Shaikh )]

 

[N Fine]

unstable and slow with long input vectors - better do everything above Z(2)

[Andrea Silvestri]

Maybe the for cycle could be replaced with on single line: r=mod(r,2)

[Rudheesh Raghav]

Good Work..

I feel the for loop is not required..

[li ming]

hao

[Glen Klein]

Communication toolbox is not required. Another reviewer (Andrea Silvestri) is right: "the for cycle could be replaced with on single line: r=mod(r,2) "

[Jo Mateix]

Was great! Thanks!

[grat c]

i used wiki's example to check for its correctness:
http://en.wikipedia.org/wiki/Cyclic_redundancy_check#Computation_of_CRC

msg = [1 1 0 1 0 0 1 1 1 0 1 1 0 0]; poly = [1 0 1 1];
the program gives r = 1 0 0

i've also tried to do the XORs by hand...
i found it is indeed 1 0 1, not sure where goes wrong

[Jochen]

does not working correct for all generator polynomials, see previous comment.
code needs review. See text bosk or wikipedia for correct (pseudo) code

[ATM]

grat c> i think your calculation is worng. i hav calculated by hand as well, it gives crc=1 0 0.i think the code is correct.

thanks.