Use CDFX-Files with Simulink Data Dictionary

Open Live Script

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 thecdfxfunction.

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

UsegetValueto extract the desired parameters into the MATLAB® workspace.

dictName ="CDFXExampleDD.sldd"

dictName = "CDFXExampleDD.sldd"

Check if dictionary is already in the working folder.

ifisfile(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 useset_paramdictionar联系现有的数据y 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 theASAM.C.MAPparameter 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 theASAM.C.SCALAR.GAINparameter 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 theASAM.C.MAPparameter, 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 calledmapData. This data can now be inspected and visualized in the MATLAB workspace.

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