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Use CDFX-Files with Simulink

Open Live Script

This example shows how to use calibration data from a CDFX-file as inputs 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: "/tmp/Bdoc23b_2361005_1548966/tp60a7197f/vnt-ex88524458/CDFXExampleFile.cdfx"
    Version: "CDF20"

Instantiate Local Variables

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

gainParam = getValue(cdfxObj, "ASAM.C.SCALAR.GAIN")
gainParam = 3

mapParam = getValue(cdfxObj, "ASAM.C.MAP")
mapParam = struct with fields:
    PhysicalValue: [5x5 double]
            Axis1: [1x1 struct]
            Axis2: [1x1 struct]

Lookup-Gain Model

open_system("CDFXSimulinkModel.slx");
cdfxMdl = gcs
cdfxMdl = 
'CDFXSimulinkModel'

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")

Figure contains an axes object. The axes object with title Simulation Output for ASAM.C.MAP, xlabel Time (seconds), ylabel data contains an object of type stair.