how can i create a delay block(like in simulink) with matlab code

Question

Tien Pham 2017-8-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/352680-how-can-i-create-a-delay-block-like-in-simulink-with-matlab-code

编辑： Walter Roberson 2021-5-31

I do a FFT project, the data go in and delay for some clock to wait the next data and caculate butterfly. Example if i delay 8 clock then simulink generate 8 register(dff) and shift them every clock, and i want do that in matlab code to generate HDL code. Some one can help me? Thank you!

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Answer 1

Kiran Kintali 2017-8-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/352680-how-can-i-create-a-delay-block-like-in-simulink-with-matlab-code#answer_278086

编辑：Walter Roberson 2021-5-31

在 MATLAB Online 中打开

test_delay.zip

delay in MATLAB can be modeled using persistent variable.

function y = fcn(u) % Unit delay implementation that maps to a register in hardware
 persistent u_d;
 if isempty(u_d)
    % defines initial value driven by unit delay at time step 0
    u_d = cast(0, 'like', u);
 end
 % return delayed input from last sample time hit
 y = u_d;
 % store the current input
 u_d = u;

https://www.mathworks.com/matlabcentral/fileexchange/16100-modelling-registers-in-embedded-matlab you may want to check out the above post.

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Conner Garcia 2021-5-31

this hasnt worked, the outputs are different. the link you sent i think there is an error when converting from Uint to a Fi object.

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Answer 2

Gareth Thomas 2017-8-14

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https://ww2.mathworks.cn/matlabcentral/answers/352680-how-can-i-create-a-delay-block-like-in-simulink-with-matlab-code#answer_277906

Have you tried the pause command?

pause: Stop MATLAB exectution temporarily

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Tien Pham 2017-8-14

No, it is register when i generate HDL code. I do a FFT project, the data go in and delay for some clock to wait the next data and caculate butterfly. If i delay 8 clock then simulink generate 8 register and shift them every clock, and i want do that in matlab code to generate HDL code. Sorry my English is weak, thank you!

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