XCP UDP Data Stimulation

Perform data stimulation on selected measurements

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  • XCP UDP Data Stimulation block

Libraries:
Vehicle Network Toolbox / XCP Communication / UDP
Simulink Real-Time / XCP / UDP

Description

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 Acceleration (Simulink).

Parameters

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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.

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.

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. Hold the Ctrl key on your keyboard to select multiple measurements.

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.

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.

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 'double' or 'string', based on the underlying Compu method conversion. For example, Compu method IDENTICAL, LINEAR, RAT_FUNC, TAB_INTP, and TAB_NOINTP port settings is 'double' while Compu method TAB_VERB port 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:

  • SBYTE

  • UWORD

  • SWORD

  • ULONG

  • SLONG

  • A_UINT64

  • A_INT64

  • FLOAT32_IEEE

  • FLOAT64_IEEE

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 LAYOUT as COLUMN_DIR or ROW_DIR. If a matrix measurement is 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.

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.

Extended Capabilities

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Version History

Introduced in R2019a

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See Also

Blocks

Topics