Function is not defined for values of class embedded.fi when using HDL coder
조회 수: 41 (최근 30일)
이전 댓글 표시
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,
댓글 수: 0
채택된 답변
Tim McBrayer
2013년 4월 2일
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.
댓글 수: 2
추가 답변 (2개)
Dhananjay Kumar
2020년 9월 17일
Here is the link to check function supported for code generation using fixed point arithmetic
댓글 수: 0
Bharath Venkataraman
2024년 1월 5일
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.
댓글 수: 0
참고 항목
카테고리
Help Center 및 File Exchange에서 HDL Coder에 대해 자세히 알아보기
제품
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!