Struct in HDL Function

Is it possible to hand over a struct containing definitions for datatypes to cast the algorithm internal? The problem is the following. I created a function, where i can configure all of the used fixed point types in my algorithm. By creating a structure containing this datatype definitions, I can handover this struct to the MainFunction of my Algorithm. By doing this i only have to change the types in the function, if i want to adjust some bit sizes.

Its not working. I get the error message: Main_CodeGen:48 Error Found unsupported dimensions on matrix type at input port: 3, name 'TypeFixed.fix_64', in the file/function Main_CodeGen

function [clk_mic,clk_laser,flagclkMic,Index,Theta_average,R_average,DataValidLockIn,sinusValue,cosinusValue] = Main_CodeGen2(FileData,PhaseIncrement,NFilter,TypeFixed)
% doing the algorithm
end

The call for this function looks like this:

% run bittrue model -> running in a for-loop
    [StrSim.clk_mic,StrSim.clk_laser,StrSim.flagclkMIC,StrSim.Index,StrSim.Theta_average,StrSim.R_average,StrSim.DataValidLockIn,...
        StrSim.sinusValue,StrSim.cosinusValue] = Main_CodeGen(StrPlot.FileData(StrSim.Index+1),StrSim.PhaseIncrement,StrSim.NFilter,Type);
    

And the Function defining the types like this:

function Type =  myTypes2(Type,Precision)

switch Precision
    
    case 'fixed'
        
        % Numeric Controlled Oscillator
        Type.fix_64         = fi([],0,64,0,'CastBeforeSum',1,'MaxProductWordLength',64,'MaxSumWordLength',64,'OverflowAction','Wrap',...
            'ProductFractionLength',0,'ProductMode','KeepLSB','ProductWordLength',64,'RoundingMethod','Nearest',...
            'SumFractionLength',0,'SumMode','KeepLSB','SumWordLength',64);
        
        % Datatype for amount of Iterations in LockIn -> Filter
        Type.fix_32         = fi([],0,32,0,'CastBeforeSum',1,'MaxProductWordLength',32,'MaxSumWordLength',32,'OverflowAction','Wrap',...
            'ProductFractionLength',0,'ProductMode','KeepLSB','ProductWordLength',32,'RoundingMethod','Nearest',...
            'SumFractionLength',0,'SumMode','KeepLSB','SumWordLength',32);
        % Output Lock-In
        Type.fix_s_64_61    = fi([],1,64,61,'CastBeforeSum',1,'MaxProductWordLength',64,'MaxSumWordLength',64,'OverflowAction','Saturate',...
            'ProductFractionLength',0,'ProductMode','KeepLSB','ProductWordLength',64,'RoundingMethod','Nearest',...
            'SumFractionLength',0,'SumMode','KeepLSB','SumWordLength',64);
        
        % sine/cosine table for values
        Type.fix_s_32_30    = fi([],1,32,32-2,'CastBeforeSum',1,'MaxProductWordLength',32,'MaxSumWordLength',32,...
            'OverflowAction','Saturate','ProductFractionLength',0,'ProductMode','KeepLSB','ProductWordLength',32,'RoundingMethod','Nearest',...
            'SumFractionLength',0,'SumMode','KeepLSB','SumWordLength',32);
        % pi-Value
        Type.fix_s_32_28    = fi([],1,32,32-4,'CastBeforeSum',1,'MaxProductWordLength',32,'MaxSumWordLength',32,...
            'OverflowAction','Saturate','ProductFractionLength',0,'ProductMode','KeepLSB','ProductWordLength',32,'RoundingMethod','Nearest',...
            'SumFractionLength',0,'SumMode','KeepLSB','SumWordLength',32);

        % Output of Average Filter Lock-In
        Type.fix_s_64_32    = fi([],1,64,32,'CastBeforeSum',1,'MaxProductWordLength',64,'MaxSumWordLength',64,'OverflowAction','Saturate',...
            'ProductFractionLength',64,'ProductMode','KeepLSB','ProductWordLength',64,'RoundingMethod','Nearest',...
            'SumFractionLength',64,'SumMode','KeepLSB','SumWordLength',64);
        
        %%% BIT TYPES %%%
        % PDM Data, Flags, Counter
        Type.fix_bit        = fi([],0,1,0,'CastBeforeSum',1,'MaxProductWordLength',8,'MaxSumWordLength',8,'OverflowAction','Saturate',...
            'ProductFractionLength',0,'ProductMode','KeepLSB','ProductWordLength',8,'RoundingMethod','Nearest',...
            'SumFractionLength',0,'SumMode','KeepLSB','SumWordLength',8);
        
        Type.fix_u_8bit     = fi([],0,8,0,'CastBeforeSum',1,'MaxProductWordLength',8,'MaxSumWordLength',8,'OverflowAction','Saturate',...
            'ProductFractionLength',0,'ProductMode','KeepLSB','ProductWordLength',8,'RoundingMethod','Nearest',...
            'SumFractionLength',0,'SumMode','KeepLSB','SumWordLength',8);
        
        Type.fix_s_8bit     = fi([],1,8,0,'CastBeforeSum',1,'MaxProductWordLength',8,'MaxSumWordLength',8,'OverflowAction','Saturate',...
            'ProductFractionLength',0,'ProductMode','KeepLSB','ProductWordLength',8,'RoundingMethod','Nearest',...
            'SumFractionLength',0,'SumMode','KeepLSB','SumWordLength',8);
end


end

Answer 1

[Kiran Kintali]

Great to know this. Thanks for sharing.

Answer 2

[Kiran Kintali]

You may find this example useful.

web(fullfile(docroot, 'fixedpoint/gs/manually-convert-a-floating-point-matlab-algorithm-to-fixed-point.html'))

Create a Table of Data Type Definitions

[Maximilian Sgodda]

Hello Kiran,

actually my question is obsolete. It's working to handover a struct with Type definitions :)

Greets Maxi