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:

  open_system(fullfile(matlabroot, 'toolbox', 'slrealtime', ...
  'examples', '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(fullfile(matlabroot, 'toolbox', 'slrealtime', ...
  'examples', '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(fullfile(matlabroot, 'toolbox', 'slrealtime', ...
  'examples', 'slrt_ex_inport_sawtooth.mat'))

Before starting this procedure, navigate to a working folder.

Map Inport to Use Square Wave

1. Open slrt_ex_osc_inport.

   model = fullfile(matlabroot, 'toolbox', 'slrealtime', ...
   'examples', 'slrt_ex_osc_inport'));
   open_system(model);
   save_system(model,'H:\workdir\slrt_ex_osc_inport.slx');

2. Load slrt_ex_inport_square.mat, and then assign square to a temporary workspace variable.

   load(docpath(fullfile(docroot, 'toolbox', 'slrealtime', ...
   'examples', 'slrt_ex_inport_square.mat')));
   waveform = square;

3. Open slrt_ex_osc_inport/In1

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

4. Turn off inport data interpolation.

   set_param(inport,'Interpolate','off');

5. Set the external input variable.

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

6. Load external input data.

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

7. You can now build, download, and execute the real-time application.

   rtwbuild(model);
   tg = slrealtime('TargetPC1');
   load(tg,model);
   start(tg);

8. 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.

1. Load slrt_ex_inport_sawtooth.mat, and then assign sawtooth to the temporary variable that you used with the Root Inport Mapper.

   load(docpath(fullfile(docroot, 'toolbox', 'slrealtime', ...
   'examples', 'slrt_ex_inport_sawtooth.mat')));
   waveform = sawtooth;

2. Create an application object.

   app_object = SimulinkRealTime.Application('slrt_ex_osc_inport');

3. Update the application object.

   updateRootLevelInportData(app_object);

4. Download the updated object to the target computer and execute it.

   tg = slrealtime;
   load(tg, 'slrt_ex_osc_inport');
   start(tg);

5. View the signals in the Simulation Data Inspector.

   Simulink.sdi.view;

Related Topics

• Define and Update Inport Data
• Load Data to Root-Level Input Ports
• Inport Data Mapping Limitations
• Data Logging with Simulation Data Inspector (SDI)