Matlab type mismatch in Embedded Matlab Functions

Hello,

I want to do a CRC-32 for a vector in an Embedded Matlab Function. Before it I've tried it in the Matlab command line and it works. The commands in Matlab look like this:

a = [1;2;3;4;5;6]  % a vector
b = dec2bin(a, 8)  % converted to binary value
c = b’  
d = reshape(c, 48, 1)  % converted to column vectors
e = double(d)  % type conversion
f = e – 48    % from ASCII to real values
hGen = comm.CRCGenerator([32 26 23 16 12 11 10 8 7 5 4 2 1   0], 'CheckSumsPerFrame', 1);    % polynomial for CRC-32
codeword = step(hGen, f)  % CRC-32 generation

but even the first step fails in the Embedded Matlab Function:

"y = dec2bin(a, 8)".

The error: Function output 'y' cannot be of MATLAB type.

What is Matlab type? Can anyone help me to solve this problem?

Thanks Senmeis

Answer 1

[Azzi Abdelmalek]

Embedded Matlab function don't allow dec2bin function. You must fix the first problem then look after the second. Maybe the second error is du to the first one.

Answer 2

[Kaustubha Govind]

Please see Alexander's answer on this previously answered question.

Answer 3

[Fred Smith]

Going through a string to get the bitstream is questionable. This is the best alternative I could come up with:

 function y = int2bit(u)
 % For code generation, input u must be of an integer class.
 y = zeros(1,numel(u) * 8);
 for i = 1:numel(u)
    y(i + (0:7)) = bitget(u(i),1:8); 
 end

I think this is very close in spirit to what you are trying to do.

HTH,

Fred