Why i do not get a fixed point out from a FFT HDL optimized block in simulink?
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Cristhian campos
on 13 Jun 2019
Commented: Bharath Venkataraman
on 19 Jun 2019
I am creating a HDL model on simulink,
using a fixed-point input on FFT HDL Optimized i get a double output, and the block parameters does not have the option of "scaling" or modify the output data type.
I am running a 2015b matlab version
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Bharath Venkataraman
on 19 Jun 2019
Edited: Bharath Venkataraman
on 19 Jun 2019
I may need the model to do further debugging. In the meantime, I created a simple FFT model in R2018b which seems to do the right thing in terms of datatypes. One change from your model is that the values are sent in serially to the FFT rather than all at once. I have also attached a model created in 15b.
I defined the input fftIn as:
fftIn = complex(rand(128,1),rand(128,1));
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Bharath Venkataraman
on 19 Jun 2019
Great! FWIW, the next few releases have a lot more capabilities for the block, so if you are able to get to a later release like R2018a, you can use these capabilities.
More Answers (1)
Bharath Venkataraman
on 18 Jun 2019
Could you double click on the FFT block and send a snapshot of its parameters?
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