Found unsupported division expression for HDL code generation; Signed input data type is not supported for division with Floor RoundMode.

Question

Tamer 2015-7-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/228493-found-unsupported-division-expression-for-hdl-code-generation-signed-input-data-type-is-not-support

评论： Tamer 2015-7-15

采纳的回答： Bharath Venkataraman

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Hello There,

I got the following error while I'm converting my Matlab Code to HDL-coder

Error : "Found unsupported division expression for HDL code generation; Signed input data type is not supported for division with Floor RoundMode."

Here is the matlab code :

Gx1(nn)=fi(cos_func(dr(nn)),true,16,16).*fi(call_power_func(2.718281828,double(-(double(t(nn)).*(double(t(nn))))/2)),true,16,16);

Notes:

t= (1x100000) double
max(t)= 0.999999000000000
min(t)= 0

[Merged from duplicate - WDR]

Hello There,

I got the following error while I'm converting my Matlab Code to HDL-coder, Can you please help me to fix this error? I simplified my code as below to trace the error, as it looks the Cos function is not working with HDL, even after I created a cos special func.

"Error: Found unsupported division expression for HDL code generation; Signed input data type is not supported for division with Floor RoundMode."
Here is the code:
dr=[0.26,0.36,0.76,0.5,0.75,0.33,0.67,0.87,0.98,0.21];  
dr= fi(dr,true,16,16);
Gx2=zeros(1,10);
Gx2= fi(Gx2,true,16,16);
      for nn=1:1:10;
          Gx2(nn)=cos_func(dr(nn));     
      end
% code end

---

where:

function  y = cos_func( x ) %#codegen
y=cos(x);
end

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Answer 1

Bharath Venkataraman 2015-7-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/228493-found-unsupported-division-expression-for-hdl-code-generation-signed-input-data-type-is-not-support#answer_186057

The cos function is not supported for HDL code generation. You can use a lookup table (predefined array)that stores the cos values and look up the right value based on the input x.