How to access a Fixed Point convert Look up table

Hello

I wish to create a look up table that will replace the hankel function. I tried to do this according to

https://www.mathworks.com/help/hdlcoder/ug/replace-a-custom-function-with-a-lookup-table.html#d123e7753

The problem is that there is no inforamation/commands available in order to access the look up table. Can

anybody help please

Thanks

Answer 1

[Sumukh]

Hi Minas.

I understand that you are trying to access the lookup table generated from HDL coder for the “hankel” function.

After following the steps provided in the documentation, a wrapper function is generated for the fixed-point MATLAB function “call_custom_fcn_fixpt”. This function includes the lookup table for the “hankel” function. It also contains additional code to generate output for any input value within the specified input range. The function uses the types and interpolation method specified in HDL Coder. This configuration is specified while generating the function.

The values of lookup table cannot be accessed by commands since it is hard coded inside a “fi” object named "LUT", in the replacement function “call_custom_fcn_fixpt” itself when generating it.

However, a workaround for this is to open the replacement function “call_custom_fcn_fixpt” itself and directly copy the lookup table values declared inside the “fi” object “LUT”.

I hope this resolves the issue.