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error in conversion to hdl code"Persistent variable 'y' must be assigned before it is used. The only exception is a check using 'isempty(y)' that can be performed prior to assignment."

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srinivasan ravi 2018-11-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431265-error-in-conversion-to-hdl-code-persistent-variable-y-must-be-assigned-before-it-is-used-the-only

回答： Kiran Kintali 2022-10-6

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hello i am trying to convert the following code into hdl but i am receiving the above error please help me with this. my input is [20385 1] and output 200

function result_k1 = tryf_fixpt(sout2)
%#codegen
persistent y
window_width=50;
if isempty(y)
for j=1:200
        window_m1=sout2((j:window_width+(j-1)));  
        window_m11=window_m1(:);
        y(j)=skewness(window_m11);
end
end     
result_k1=fi(y);

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回答（1 个）

Kiran Kintali 2022-10-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431265-error-in-conversion-to-hdl-code-persistent-variable-y-must-be-assigned-before-it-is-used-the-only#answer_1068125

You have too much IO on the DUT.

(20385 + 200)*dataWordLength ==> too many IO pins.

Either you need to stream the inputs and outputs manually as shown in this example

https://www.mathworks.com/help/hdlcoder/ug/image-enhancement-by-histogram-equalization.html

or consider automatic IO optimization described below.

HDL Code Generation from Frame-Based Algorithms

https://www.mathworks.com/help/hdlcoder/ug/frame-to-sample-or-pixel-conversion-to-target-stream-based-hardware.html

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