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

Question

Sam 2013-4-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/69536-function-is-not-defined-for-values-of-class-embedded-fi-when-using-hdl-coder

回答： Bharath Venkataraman 2024-1-5

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,

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Tim McBrayer 2013-4-2

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/69536-function-is-not-defined-for-values-of-class-embedded-fi-when-using-hdl-coder#answer_80743

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.