coder.asap2.Characteristic

Create characteristic object

Since R2022b

Syntax

param = coder.asap2.Characteristic

Description

param = coder.asap2.Characteristic creates a characteristic object. You can use the object to define a characteristic element and export it to an ASAP2 file.

Examples

Customize an ASAP2 File

Add, update, filter, find, and remove ECU descriptions in an ASAP2 file.

Open and Build Example Model

Open the example model ASAP2Demo

open_system("ASAP2Demo");

Build the model.

rtwbuild("ASAP2Demo");

### Starting serial model reference code generation build.
### Successfully updated the model reference code generation target for: ASAP2DemoModelRef
### Starting build procedure for: ASAP2Demo
### Successful completion of build procedure for: ASAP2Demo

Build Summary

Code generation targets built:

Model              Action                        Rebuild Reason                       
======================================================================================
ASAP2DemoModelRef  Code generated and compiled.  ASAP2DemoModelRef.c does not exist.  

Top model targets built:

Model      Action                        Rebuild Reason                                    
===========================================================================================
ASAP2Demo  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 46.784s

Create the ECU description object for the model.

descObj = coder.asap2.getEcuDescriptions("ASAP2Demo");

Get the list of available computation methods in the description object.

find(descObj,"CompuMethod")

ans = 1x10 string
    "ASAP2DemoModelRef_CM_double"    "ASAP2DemoModelRef_CM_int16_rpm"    "ASAP2Demo_CM_double"    "ASAP2Demo_CM_double_m_per__s_2_"    "ASAP2Demo_CM_double_rpm"    "ASAP2Demo_CM_int32"    "ASAP2Demo_CM_single"    "ASAP2Demo_CM_single_m_per__s_2_"    "ASAP2Demo_CM_single_rpm"    "ASAP2Demo_CM_uint8"

Filter the computation methods and get a list of computation methods that use rpm as the unit.

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

ans = 1x3 string
    "ASAP2DemoModelRef_CM_int16_rpm"    "ASAP2Demo_CM_double_rpm"    "ASAP2Demo_CM_single_rpm"

Create and Add Custom Computation Method

To add a new computation method to the ASAP2 file, create a custom computation method.

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 computation method to the ECU description object.

add(descObj,CompuMethod_CM1);

Get the properties of the newly added computation method.

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]
         CustomData: ""

To modify a property of the computation method, use set function. Update the LongIdentifier field of the computation method.

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 computation method CompuMethod_1.

coder.asap2.export("ASAP2Demo",CustomEcuDescriptions=descObj);

Following Characteristics or Measurements with unsupported data types are not exported in ASAP2 file. "ASAP2Demo_DW.ASAP2DemoModelRef_InstanceData"

Delete Computation Method

Remove the newly added computation method from the description object.

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

Create and Add Custom Characteristic

To add a new characteristic to the ASAP2 file, create a custom characteristic.

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.

add(descObj,Parameter_1);

Get the properties of the newly added characteristic.

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
             MaxRefresh: [1x1 struct]
             SymbolLink: [1x1 struct]
             CustomData: ""

To modify a property of the characteristic, use set function. Update the UpperLimit field of the characteristic.

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 Custom_parameter1.

coder.asap2.export("ASAP2Demo",CustomEcuDescriptions=descObj);

Following Characteristics or Measurements with unsupported data types are not exported in ASAP2 file. "ASAP2Demo_DW.ASAP2DemoModelRef_InstanceData"

Remove the newly added characteristic from the description object.

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

Create and Add Custom Measurement

To add a new measurement to the ASAP2 file, create a custom measurement.

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.

add(descObj,Signal_1);

Get the properties of the newly added measurement.

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
               MaskData: [1x1 struct]
             MaxRefresh: [1x1 struct]
             SymbolLink: [1x1 struct]
             CustomData: ""

To modify a property of the measurement, use set function. Update the CalibrationAccess field of the measurement.

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("ASAP2Demo",CustomEcuDescriptions=descObj);

Following Characteristics or Measurements with unsupported data types are not exported in ASAP2 file. "ASAP2Demo_DW.ASAP2DemoModelRef_InstanceData"

Remove the newly added measurement from the description object.

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

Create and Add Lookup Table Parameter

Add a lookup table parameter.

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 = 'ASAP2Demo_CM_double';
axis_data(2).CompuMethodName = 'ASAP2Demo_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 custom_lookup_table.

coder.asap2.export("ASAP2Demo",CustomEcuDescriptions=descObj);

Following Characteristics or Measurements with unsupported data types are not exported in ASAP2 file. "ASAP2Demo_DW.ASAP2DemoModelRef_InstanceData"

Output Arguments

param — Characteristic object

coder.asap2.Characteristic object

Characteristic object, specified as a coder.asap2.Characteristic object. Use the object to add required information to an ASAP2 file.

Example: Custom_Parameter = coder.asap2.Characteristic

Tips

This table shows the fields of the characteristic object.

Element	Description
Name	Unique identifier in the ECU program
LongIdentifier	Description or comment
Type	Possible types such as CURVE, MAP, CUBOID, CUBE_4, CUBE_5, VALUE, VAL_BLK
EcuAddress	Address of the element in memory
CompuMethodName	Name of the conversion method
LowerLimit	Minimum possible value
UpperLimit	Maximum possible value
EcuAddressComment	Specify symbols for address replacement
EcuAddressExtension	Additional address information
CalibrationAccess	Access of the element for calibration
DisplayIdentifier	Display name
Format	Display format
BitMask	Specify to handle the single bits
AxisInfo	Specify the parameters for the axis descriptions
ExportArrayAsFixAxis	Specify 'true' to export array as a look up table of type FIX_AXIS
Transpose	Set true to transpose the axis. It is applicable only for lookup tables
ComparisonQuantity	References a valid MEASUREMENT in the ASAP2 file. It is applicable only for lookup tables
RecordLayout	Description of the various data structures
Dimensions	Dimensions for an array data type
ForceShared	Describe STD_AXIS as COM_AXIS
Export	Export or do not export the element to A2L file
SymbolLink	Reference to symbol name within a linker map file
MaxRefresh	Maximum refresh rate
CustomData	Any ASAP2 (a2l) snippet provided by the user

Version History

Introduced in R2022b