Define and Update Inport Data by Using MATLAB Language

You can create root-level input ports and use the MATLAB^® language to define input data and to update the input data without rebuilding the model.

Required Files

This procedure has these file dependencies:

slrt_ex_osc_inport — Damped oscillator that takes its input data from input port In1 and sends its multiplexed output to output port Out1. To open this model, in the MATLAB Command Window, type:
```
openExample('slrealtime/SlrtStimulateRootInportByUsingMATLABLanguageExample');
open_system('slrt_ex_osc_inport');
```
slrt_ex_inport_square.mat— One second of output from a Signal Generator block that is configured to output a square wave. To load this data, in the MATLAB Command Window, type:
```
load('slrt_ex_inport_square.mat');
```
slrt_ex_inport_sawtooth.mat — One second of output from a Signal Generator block that is configured to output a sawtooth wave. To load this data, in the MATLAB Command Window, type:
```
load('slrt_ex_inport_sawtooth.mat');
```

Before starting this procedure, navigate to a working folder.

Map Inport to Use Square Wave

This procedure maps an inport.

Open slrt_ex_osc_inport.

openExample('slrealtime/SlrtStimulateRootInportByUsingMATLABLanguageExample');
model = 'slrt_ex_osc_inport';
open_system(model);
myFolder = fullfile(userpath,'temp');
save_system(model,[myFolder '/slrt_ex_osc_inport.slx']);

Load slrt_ex_inport_square.mat, and then assign square to a temporary workspace variable.
```
load('slrt_ex_inport_square.mat');
waveform = square;
```

Open slrt_ex_osc_inport/In1

inport = [model '/In1'];
load_system(inport);

Turn off inport data interpolation.
```
set_param(inport,'Interpolate','off');
```

Set the external input variable.

set_param(model,'ExternalInput','waveform');

Load external input data.

set_param(model,'LoadExternalInput','on');

You can now build, download, and execute the real-time application.
```
slbuild(model);
tg = slrealtime('TargetPC1');
load(tg,model);
start(tg);
```
View the signals in the Simulation Data Inspector.
```
Simulink.sdi.view;
```

Update Inport to Use Sawtooth Wave

You can update the inport data to use a different data file without rebuilding the real-time application. The slrt_ex_osc_inport.mldatx file must be in the working folder.

Load slrt_ex_inport_sawtooth.mat, and then assign sawtooth to the temporary variable that you used with the Root Inport Mapper.
```
load('slrt_ex_inport_sawtooth.mat');
waveform = sawtooth;
```

Create an application object.

app_object = slrealtime.Application('slrt_ex_osc_inport');

Update the application object.
```
updateRootLevelInportData(app_object);
```
Download the updated object to the target computer and execute it.
```
tg = slrealtime;
load(tg, 'slrt_ex_osc_inport');
start(tg);
```
View the signals in the Simulation Data Inspector.
```
Simulink.sdi.view;
```