Using ASAM CDFX Data With Simulink Data Dictionary

This example shows how to store calibration data from an ASAM CDFX file in a data dictionary and use these values as parameters to a Simulink model.

Import Data

Import the calibration data using the cdfx function.

cdfxObj = cdfx("CDFXExampleFile.cdfx")
cdfxObj = 
  CDFX with properties:

       Name: "CDFXExampleFile.cdfx"
       Path: "/mathworks/home/rollinb/Documents/MATLAB/Examples/vnt-ex73237310-20190405222527/CDFXExampleFile.cdfx"
    Version: "CDF20"

Create and Populate Data Dictionary with Calibration Data

Use getValue to extract the desired parameters into the MATLAB workspace.

dictName = "CDFXExampleDD.sldd"
dictName = 
"CDFXExampleDD.sldd"
% Check if dictionary is already in the working folder.
if isfile(dictName)
    % If data dictionary exists, open it.
    dDict = Simulink.data.dictionary.open(dictName)
else
    % If dictionary does not exist, create it and populate with CDFX data.
    dDict = Simulink.data.dictionary.create(dictName)
    ddSection = getSection(dDict, "Design Data")
    
    addEntry(ddSection, "gainParam", getValue(cdfxObj, "ASAM.C.SCALAR.GAIN"))
    addEntry(ddSection, "mapParam", getValue(cdfxObj, "ASAM.C.MAP"))
end
dDict = 
  Dictionary with properties:

                    DataSources: {0×1 cell}
       HasAccessToBaseWorkspace: 0
    EnableAccessToBaseWorkspace: 0
              HasUnsavedChanges: 0
                NumberOfEntries: 2

% Display contents of the data dictionary.
listEntry(dDict)
  Section       Name        Status   DataSource           LastModified       LastModifiedBy   Class    

  Design Data   gainParam            CDFXExampleDD.sldd   2019-04-05 22:33   rollinb          double   
  Design Data   mapParam             CDFXExampleDD.sldd   2019-04-05 22:33   rollinb          struct   

Link Data Dictionary to Simulink Model

Open the Simulink model, then use set param to link the existing data dictionary to your model. This will allow the model to access the values defined within the dictionary.

open_system("CDFXSLDDModel.slx");
cdfxMdl = gcs
cdfxMdl = 
'CDFXSLDDModel'
set_param(gcs, 'DataDictionary', dictName)

We can now close the connection to the data dictionary.

close(dDict)

Lookup-Gain Model

This model contains:

  • 2-D Lookup Table block to represent the ASAM.C.MAP parameter from the CDFX file. The "Table data" field represents the physical value of the instance, and the "Breakpoint" fields represent the physical values of the axes.

  • Gain block to represent the ASAM.C.SCALAR.GAIN parameter from the CDFX file.

  • To Workspace block to log the simulation data.

Indexing Logic Subsystem

The Indexing Logic subsystem uses the physical values of the axes of the ASAM.C.MAP parameter, along with signal routing blocks and a triggered subsystem, to produce all valid combinations of lookup indices. This configuration can be useful if you need to test across the full range of possible input values of a calibration parameter.

Log Output Data in MATLAB

The output of the simulation is sent to MATLAB by the To Workspace block, where it is stored as a timeseries object called mapData. This data can now be inspected and visualized in the MATLAB workspace.

sim(cdfxMdl);
plot(mapData)
title("Simulation Output for ASAM.C.MAP")

% Copyright 2018 The MathWorks, Inc.