To simulate the model with the fixed-point data types and see bit-true behavior will require a Fixed-Point Designer license.
However, there is a feature called Data Type Override that will allow the fixed-point and integer types to be ignored and replaced with floating-point double or single. Data Type Override allows a quick and easy switch to the more luxurious math of doubles or singles. This is helpful for debugging or creating a "golden baseline."
If all the fixed-point types used in the model are overriden to double or to single, then the Fixed-Point Designer license will not be required.
Many blocks in Simulink, including the basic math blocks, are designed to support Data Type Override. But some parts of a model, such as user written s-functions, might not work with data type override or might not accept double or single. In those cases, the Data Type Override approach described here will not work.
To see an example, download the attached files in R2019a or later, and run the following code.
% Select whether to override types
% to floating-point double or single
%
wantDouble = 0;
if wantDouble
fiOverride = 'TrueDoubles';
slOverride = 'Double';
else
fiOverride = 'TrueSingles';
slOverride = 'Single';
end
% Override any
% subsequently created fi object to be floating-point
%
fp = fipref;
fp.DataTypeOverride = fiOverride;
%
% Open model
%
mdl = 'fixpt_dt_override_example';
open_system(mdl);
%
% Limit data type override to just integer and fixed-point types
%
set_param(mdl, 'DataTypeOverrideAppliesTo','Fixed-point')
%
% Override all integer and fixed-point data types to
% floating-point for compatible Simulink blocks
%
set_param(mdl, 'DataTypeOverride', slOverride)
%
% simulate
%
sim(mdl)
% license('inuse')
