Function is not defined for values of class embedded.fi when using HDL coder

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Hi,
When I am experimenting in converting matlab code into vhdl with hdl coder, I am getting the error such as Function 'log' is not defined for values of class 'embedded.fi' or Function 'exp' is not defined for values of class 'embedded.fi'.
The specific block of code comes from the block:
f_0 = fi( 0, 0, 1, 0, fm ); % 133.33333;
f_sp = fi( 200*fi( 1/3, 0, 14, 15 ), 0, 14, 7, fm ); % 66.66667;
brkfrq = fi( 1000, 0, 11, 0, fm );
brkpt = fi( fi_div( (brkfrq - f_0), f_sp ), 0, 14, 10, fm );
logstep = fi( 1.0711703, 0, 14, 13, fm );
linpts = (f<brkfrq);
z = fi( fi( 0, 0, 1, 0 )*f, 0, 6, 0, fm );
z( linpts ) = fi( fi_div( (f( linpts ) - f_0), f_sp ), 0, 6, 0, fm );
% error with line below.
z( ~(linpts~=0) ) = fi( brkpt + (log( fi_div( f( ~(linpts~=0) ), brkfrq ) )) ./ log( logstep ), 0, 6, 0, fm );
The original matlab code is from audspec.m of rastamat. I have tried converting fixed point to double before calling log(), but then another error pops up.
Thanks,

Respuesta aceptada

Tim McBrayer
Tim McBrayer el 2 de Abr. de 2013
As the error message states, there is no fixed-point version of the 'log' or 'exp' commands in MATLAB HDL Coder. The complete list of functions that have fixed point versions and are supported for HDL code generation is at http://www.mathworks.com/help/hdlcoder/ug/fixed-point-run-time-library-support.html.
  2 comentarios
Sam
Sam el 2 de Abr. de 2013
Thanks for point this out. I think I was looking for that page, but couldn't find it.
Shubham Kapoor
Shubham Kapoor el 21 de Abr. de 2015
Is there any workaround around using expn function?

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Más respuestas (2)

Dhananjay Kumar
Dhananjay Kumar el 17 de Sept. de 2020
Here is the link to check function supported for code generation using fixed point arithmetic

Bharath Venkataraman
Bharath Venkataraman el 5 de En. de 2024
HDL Coder allows you to replace an unsupported function with an equivalent Lookup table. Here is an example on how to do that for exp.

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