HDLcoder ignores coder.const
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Anze Slosar on 13 Sep 2022
Answered: Kiran Kintali on 25 Sep 2022
I'm tryint to compile some code into HDL. There are weights used in digital filter which I want to precompute at the compile time.
The way I did this is
persistent c buf tout pfb_weights;
pfb_weights = coder.const(get_pfb_weights(settings_Nfft,settings_Ntaps));
The reason I think it is not working is that the coding report says:
- It lists sin function under Toolbox Function Usage: Supported List. Sin function is only used in get_pfb_weights function
- It lists coder/matlabcoder under Toolbox Function Usage: Unsupported List
- If I attempt fixedpoint conversion it complains that function "double" inside get_pfb_weights is not suitable for fixed point conversion and wouldn't proceed.
How do we fix this?
David Fink on 14 Sep 2022
By making the call to get_pfb_weights opaque to code generation (so fixed-point conversion won't try to process it), you can call it extrinsically (in MATLAB), at compile-time, via coder.const and coder.extrinsic.
See the coder.extrinsic documentation for a coder.const example.
More Answers (1)
Kiran Kintali on 25 Sep 2022
You can find examples of HDL Coder friendly designs with coder.load and coder.const in the attachment.
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