XCP UDP Data Stimulation
Perform data stimulation on selected measurements
Vehicle Network Toolbox / XCP Communication / UDP
Simulink Real-Time / XCP / UDP
The XCP UDP Data Stimulation block sends data to the selected server connection for the event measurements that you select. The block uses the XCP UDP transport layer to output raw data for the selected measurements at the specified stimulation time step. Configure your XCP session and use the XCP UDP Data Stimulation block to select your event and measurements on the configured server connection. The block displays the selected measurements as input ports.
The XCP communication blocks support Simulink® accelerator mode and rapid accelerator mode. You can speed up the execution of Simulink models by using these modes. For more information about these simulation modes, see Design Your Model for Effective Acceleration (Simulink).
Config name — Specify XCP UDP session name
select from list
Select the name of XCP configuration that you want to use. This list displays all available names specified in the available XCP UDP Configuration blocks in the model. Selecting a configuration displays events and measurements available in the A2L file of this configuration. You can stimulate measurements for only one event by using an XCP UDP Data Stimulation block. Use one block for each event whose measurements you want to stimulate.
Event name — Select an event
select from list
Select an event from the event list. The XCP UDP Configuration block uses the specified A2L file to populate the events list. The block is configured with the corresponding event number from the A2L.
The event time cycle does not control transmission of stimulation packets. The block stimulates each time it executes. For use in Simulink simulation, consider enabling simulation pacing to avoid free-running stimulation.
All Measurements — List all measurements available for event
This list displays all measurements available for the selected event.
Select the measurement that you want to use and click the add button,
to move it to the selected measurements.
Ctrl key on your keyboard to select multiple
In the block parameters dialog box, type the name of the measurement you want to use. The All Measurements lists displays a list of all matching names. Click the x to clear your search.
Selected Measurements — List selected measurements
This list displays your selected measurements. To remove a measurement from this list, select the measurement and click the remove button, .
In the Block Parameters dialog box, use the toggle buttons to reorder the selected measurements.
Block Input Settings — Set the port input as Compu method conversion values or raw values
Raw values as double (no Compu method
conversion) (default) |
Raw values (no Compu method conversion) |
Physical values (apply Compu method
This parameter enables support for XCP data types and dimensions as defined in the ASAP2 standard. The Block Input Settings parameter selects whether the port outputs Compu method conversion values or raw values. The options provide:
Physical values (apply Compu method conversion)enables the physical-to-raw conversion of ECU measurement values. For this option, the block port settings are set either to
'string', based on the underlying Compu method conversion. For example, Compu method
TAB_NOINTPport settings is
'double'while Compu method
TAB_VERBport settings is
'string'. The maximum string length supported for Compu method conversion is 1024 as specified in the ASAM XIL specification.
The FORM Compu method conversion is not supported. Simulink throws a warning for such a conversion and IDENTICAL conversion is applied to the underlying measurement. Also, only scalar measurement signals are supported for TAB_VERB conversion as Simulink only supports scalar strings.
Selecting this option shows the physical units (if any) in front of the measurement name on the block mask. This physical unit is acquired from the A2L description of the measurement and Compu method. If the physical unit is not specified, only the measurement name is displayed.
Raw values (no Compu method conversion)sets the port data type according to the type definition in the A2L file and supports up to three-dimensional XCP measurements in Simulink.
Raw values as double (no Compu method conversion)sets the port data type as
double, converting all internal measurement values. This selection supports up to three-dimensional XCP measurements in Simulink.
These ASAP2 data types are supported by corresponding Simulink port data types:
The dimension support in the block accommodates the different treatment of
matrices by MATLAB® and the ECU. The MATLAB default operation treats matrices as
row-major matrices. An XCP measurement can have a
ROW_DIR . If a matrix
COLUMN_DIR, the blocks rearrange the
measurement in memory and ensure that the matrix (row X, col Y) in MATLAB
refers to the same entry as (row X, col Y) on the ECU. The rearrangement
causes matrix entries that are contiguous on the ECU to be noncontiguous in
MATLAB and Simulink.
Enable Timestamp — Enable sending Simulink timestamp in STIM DTO packets
off (default) |
When the Timestamp is enabled, the block inputs a timestamp from Simulink and sends the timestamp in the STIM DTO packets. The Enable Timestamp check box appears in the block parameters dialog box when the parameter is supported in the A2L file.
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
The XCP communication blocks support code generation with limited deployment portability that runs only on the host computer or Simulink Real-Time™ targets.
Code generation requires a C++ compiler that is compatible with the code generation target. For more information, see Supported and Compatible Compilers.