Create and Add Custom Data Elements

Generate an ASAP2 file by adding custom characteristics, measurements, axis-points, functions, and compu methods. By default, an ASAP2 file contains the data elements present in model that were configured to export.

Using the Simulink^® Coder™ you can:

• Create and add custom data elements such as characteristics, measurements, axis-points, functions, and compu methods.

• Remove data elements from the ASAP2 file.

• Filter and filter data elements based on their properties.

• Get or update the properties of data elements.

Customize an ASAP2 File

This example shows how to add, update, filter, find, and remove ECU descriptions in an ASAP2 file.

Open and build the example model

Open the example model rtwdemo_asap2

open_system("rtwdemo_asap2");

Build the model.

rtwbuild("rtwdemo_asap2");

### Starting serial model reference code generation build.
### Successfully updated the model reference code generation target for: rtwdemo_asap2_mdlref
### Starting build procedure for: rtwdemo_asap2
### Successful completion of build procedure for: rtwdemo_asap2

Build Summary

Code generation targets built:

Model                 Action                        Rebuild Reason                          
============================================================================================
rtwdemo_asap2_mdlref  Code generated and compiled.  rtwdemo_asap2_mdlref.c does not exist.  

Top model targets built:

Model          Action                        Rebuild Reason                                    
===============================================================================================
rtwdemo_asap2  Code generated and compiled.  Code generation information file does not exist.  

2 of 2 models built (0 models already up to date)
Build duration: 0h 0m 16.658s

Create the ECU description object for the model.

descObj=coder.asap2.getEcuDescriptions("rtwdemo_asap2");

Get the list of available compu methods in the description object using the command:

find(descObj,"CompuMethod")

ans = 1x10 string
  Columns 1 through 3

    "rtwdemo_asap2_CM..."    "rtwdemo_asap2_CM..."    "rtwdemo_asap2_CM..."

  Columns 4 through 6

    "rtwdemo_asap2_CM..."    "rtwdemo_asap2_CM..."    "rtwdemo_asap2_CM..."

  Columns 7 through 9

    "rtwdemo_asap2_CM..."    "rtwdemo_asap2_CM..."    "rtwdemo_asap2_md..."

  Column 10

    "rtwdemo_asap2_md..."

Filter the compu methods and get the list of compu methods with units as "rpm".

find(descObj,"CompuMethod",Units='rpm')

ans = 1x3 string
    "rtwdemo_asap2_CM_..."    "rtwdemo_asap2_CM_..."    "rtwdemo_asap2_mdl..."

Create and Add a Custom Compu Method

To add a new compu method to the ASAP2 file, create a custom compu method using the commands:

CompuMethod_CM1 = coder.asap2.CompuMethod;
CompuMethod_CM1.Name = 'CompuMethod_1';
CompuMethod_CM1.ConversionType = 'LINEAR';
CompuMethod_CM1.Coefficients = [2 3];
CompuMethod_CM1.LongIdentifier = 'longIdentifierTest';
CompuMethod_CM1.Format = '%2.3';
CompuMethod_CM1.Units = 's';

Add the custom compu method to the ECU description object using the command:

add(descObj,CompuMethod_CM1);

Get the properties of the newly added compu method using the command:

get(descObj,"CompuMethod","CompuMethod_1")

ans = 
  CompuMethod with properties:

               Name: 'CompuMethod_1'
     LongIdentifier: 'longIdentifierTest'
             Format: '%2.3'
              Units: 's'
       Coefficients: [2 3]
     ConversionType: 'LINEAR'
    CompuVTabValues: [1x1 struct]

To modify any property of the compu method, use set function. Update the "LongIdentifier" field of the compu method using the command:

set(descObj,"CompuMethod","CompuMethod_1",LongIdentifier="longIdentifierCM1")

Generate the ASAP2 file using the updated ECU description object and verify that the ASAP2 file contains the compu method with name "CompuMethod_1".

coder.asap2.export("rtwdemo_asap2",CustomEcuDescriptions=descObj);

Following Characteristics or Measurements with unsupported data types are not exported in ASAP2 file. "rtwdemo_asap2_DW.rtwdemo_asap2_mdlref_InstanceDa"

Delete a Compu Method

Remove the newly added compu method from the description object using the command:

delete(descObj,"CompuMethod","CompuMethod_1");

Create and Add Custom Characteristic

To add a new characteristic to the ASAP2 file, create a custom characteristic using the commands:

Parameter_1 = coder.asap2.Characteristic;
Parameter_1.Name = 'Custom_parameter1';
Parameter_1.LongIdentifier = 'longIdentifierParam';
Parameter_1.UpperLimit = 255;
Parameter_1.LowerLimit = 0;

Add the custom characteristic to the ECU description object using the command:

add(descObj,Parameter_1);

Get the properties of the newly added characteristic using the command:

get(descObj,"Characteristic","Custom_parameter1")

ans = 
  Characteristic with properties:

                   Name: 'Custom_parameter1'
         LongIdentifier: 'longIdentifierParam'
                   Type: 'VALUE'
             EcuAddress: '0x0000'
        CompuMethodName: 'NO_COMPU_METHOD'
             LowerLimit: 0
             UpperLimit: 255
      EcuAddressComment: ""
    EcuAddressExtension: []
      CalibrationAccess: 'Calibration'
      DisplayIdentifier: ""
                 Format: ""
                BitMask: []
               AxisInfo: []
           RecordLayout: ""
             Dimensions: []
                 Export: 1
             SymbolLink: [1x1 struct]

To modify any property of the characteristic, use set function. Update the "UpperLimit" field of the characteristic using the command:

set(descObj,"Characteristic","Custom_parameter1",UpperLimit=128)

Generate the ASAP2 file using the updated ECU description object and verify that the ASAP2 file contains the characteristic with name "Custom_parameter1".

coder.asap2.export("rtwdemo_asap2",CustomEcuDescriptions=descObj);

Following Characteristics or Measurements with unsupported data types are not exported in ASAP2 file. "rtwdemo_asap2_DW.rtwdemo_asap2_mdlref_InstanceDa"

Remove the newly added characteristic from the description object using the command:

delete(descObj,"Characteristic","Custom_parameter1");

Create and Add Custom Measurement

To add a new measurement to the ASAP2 file, create a custom measurement using the commands:

Signal_1 = coder.asap2.Measurement;
Signal_1.Name = 'Custom_signal1';
Signal_1.LongIdentifier = 'longIdentifierSignal';
Signal_1.UpperLimit = 255;
Signal_1.LowerLimit = 0;

Add the custom measurement to the ECU description object using the command:

add(descObj,Signal_1);

Get the properties of the newly added measurement using the command:

get(descObj,"Measurement","Custom_signal1")

ans = 
  Measurement with properties:

                   Name: 'Custom_signal1'
         LongIdentifier: 'longIdentifierSignal'
               DataType: 'UBYTE'
             EcuAddress: '0x0000'
        CompuMethodName: ""
             LowerLimit: 0
             UpperLimit: 255
                 Raster: [1x1 struct]
      EcuAddressComment: ""
    EcuAddressExtension: []
      CalibrationAccess: 'NoCalibration'
      DisplayIdentifier: ""
                 Format: ""
                BitMask: []
             Dimensions: []
                 Export: 1
             SymbolLink: [1x1 struct]

To modify any property of the measurement, use set function. Update the "CalibrationAccess" field of the measurement using the command:

set(descObj,"Measurement","Custom_signal1",CalibrationAccess='Calibration')

Generate the ASAP2 file using the updated ECU description object and verify that the ASAP2 file contains the measurement with name "Custom_signal1".

coder.asap2.export("rtwdemo_asap2",CustomEcuDescriptions=descObj);

Following Characteristics or Measurements with unsupported data types are not exported in ASAP2 file. "rtwdemo_asap2_DW.rtwdemo_asap2_mdlref_InstanceDa"

Remove the newly added measurement from the description object using the command:

delete(descObj,"Measurement","Custom_signal1");

Create and Add a Lookup Table Parameter

To add a lookup table parameter, create a parameter using the commands:

LUT_Parameter = coder.asap2.Characteristic;
LUT_Parameter.Name = "custom_lookup_table";
LUT_Parameter.Type = "MAP";

Create and add axis information to the parameter.

axis_data = coder.asap2.AxisInfo;
axis_data(1).Name = 'BP3';
axis_data(2).Name = 'Bp4';
axis_data(1).CompuMethodName = 'rtwdemo_asap2_CM_double';
axis_data(2).CompuMethodName = 'rtwdemo_asap2_CM_double';
axis_data(1).MaxAxisPoints = '3';
axis_data(2).MaxAxisPoints = '3';
axis_data(1).AxisType = 'STD_AXIS';
axis_data(2).AxisType = 'STD_AXIS';
LUT_Parameter.AxisInfo = axis_data;

Add the lookup table parameter to the description object.

add(descObj,LUT_Parameter)

Generate the ASAP2 file using the updated ECU description object and verify that the ASAP2 file contains the lookup table parameter with name "custom_lookup_table".

coder.asap2.export("rtwdemo_asap2",CustomEcuDescriptions=descObj);

Following Characteristics or Measurements with unsupported data types are not exported in ASAP2 file. "rtwdemo_asap2_DW.rtwdemo_asap2_mdlref_InstanceDa"