XCP CAN Data Acquisition
Acquire selected measurements from configured server connection
Libraries:
Vehicle Network Toolbox /
XCP Communication /
CAN
Simulink Real-Time /
XCP /
CAN
Description
The XCP CAN Data Acquisition block acquires data from the configured server connection based on measurements that you select. The block uses the XCP CAN transport layer to obtain raw data for the selected measurements at the specified simulation time step. Configure your XCP connection and use the XCP CAN Data Acquisition block to select your event and measurements for the configured server connection. The block displays the selected measurements as output ports.
The XCP communication blocks support the use of Simulink® accelerator mode and rapid accelerator mode. You can speed up the execution of Simulink models by using these modes. For more information on these simulation modes, see Acceleration.
Ports
Output
Data — Output measurement samples
defined by A2L file
Output measurement samples, with names and types defined by the A2L file. Each entry in the Selected Measurements parameter defines an output port. A sample is available at every port for every step of the simulation.
Parameters
Config name — Specify XCP CAN session name
select from list
Select the name of the XCP configuration that you want to use. This list displays all available names specified in the XCP CAN Configuration blocks in the model. Selecting a configuration displays events and measurements available in the A2L file of this configuration.
Note
You can acquire measurements for only one event by using an XCP CAN Data Acquisition block. Use one block for each event whose measurements you want to acquire.
Event name — Select an event
select from list
Select an event from the available list of events. The XCP CAN Configuration block uses the specified A2L file to populate the events list.
All Measurements — List all measurements available for event
measurements list
This list displays all measurements available for the selected event. Select the measurement that you want to use and click the add button, to add it to the selected measurements. On your keyboard, press the Ctrl key to select multiple measurements.
In the Block Parameters dialog box, type the name of the measurement you want to use in the Search box. The All Measurements list displays a list of all matching names. Click the x to clear your search.
Selected Measurements — List selected measurements
measurement names
This list displays selected measurements. Each selected measurement adds an output port to the block with the measurement name. To remove a measurement from this list, select the measurement and click the remove button, .
In the Block Parameters dialog box, use the shift buttons to reorder the selected measurements.
Block Output Settings — Set the port output 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 conversion)
This parameter enables support for XCP data types and dimensions as defined in the ASAP2 standard. The Block Output 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 raw-to-physical 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 methodIDENTICAL
,LINEAR
,RAT_FUNC
,TAB_INTP
, andTAB_NOINTP
port settings is'double'
while Compu methodTAB_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 asdouble
, 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.
DAQ List Priority — Specify a priority value for server device driver
priority value
Specify a priority value as an integer from 0 to 255 for the server device
driver to prioritize transmission of data packets. The server can accumulate XCP
packets for lower priority DAQ lists before transmission to the client. A value of
255 has the highest priority. The SET_DAQ_LIST_MODE
command
communicates the DAQ List Priority value from
client to server. This communication method differs from the specification of the
Event Channel Priority property, which comes from the A2L file.
Sample time — Specify sampling time of block
-1
(default)
Specify the sampling time of the block during simulation, which is the
simulation time. This value defines the frequency at which the XCP CAN Data
Acquisition block runs during simulation. If the block is inside a
triggered subsystem or is to inherit sample time, you can specify
–1
as your sample time, which is the default. You can also
specify a MATLAB variable for sample time. For more information, see What Is Sample Time?.
Enable Timestamp — Enable reading timestamp from incoming DTO packets
off
(default) | on
When the Timestamp is enabled, the block reads the timestamp from incoming DTO packets and outputs the timestamp to Simulink. The Enable Timestamp check box appears in the block parameters dialog box when the parameter is supported in the A2L file.
Extended Capabilities
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.
Version History
Introduced in R2013a
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