HDL Coder Delay (or Pause) in Code

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Nick 2015-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/183429-hdl-coder-delay-or-pause-in-code

回答： Tim McBrayer 2015-3-16

I'm trying to create a VDHL program using HDL Coder which can cycle through the LEDs, so turn on LED(0), delay 1 second, so turn on LED(1), delay 1 second, etc.

I'm having a problem with the delay since I can't use the usual MATLAB pause function. Has anyone managed to successfully write a delay function for HDL coder? I tried having a large for loop, but that's not even getting translated to VHDL.

Many Thanks

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Answer 1

Tim McBrayer 2015-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/183429-hdl-coder-delay-or-pause-in-code#answer_171523

If you need a real-world delay, your best bet is to build a counter that counts N cycles and a comparison to a specific value. Each count will take 1/F sec, where F is your clock rate. For a 1 second delay, you will need to count F cycles.