Capital VSTAR Integrator configures an AUTOSAR ECU and can generate the A2L description that a separate measurement and calibration (MC) tool uses. Calibration then depends on an end-to-end XCP setup: the target ECU must contain a configured XCP driver, and the MC tool and ECU must be connected through a compatible interface and transport. Siemens’ published workflow explains the handoffs; project-specific module settings, addresses, hardware and compatibility must be confirmed for the target ECU.
What each part of the toolchain does
| Part | Role in the workflow |
|---|---|
| Capital VSTAR Integrator | Configures AUTOSAR ECU software and, in Siemens’ described workflow, generates the A2L description. It is not the MC application that performs live calibration. |
| A2L file | Describes measurement and calibration objects and the information the MC tool needs to access them. Siemens describes combining ECU description data and XCP interface data with addresses from the executable’s map file. |
| XCP | Provides the measurement and calibration communication protocol between the MC tool and the ECU’s embedded XCP driver over a configured transport. |
| MC tool | Imports the A2L, presents parameters by name, and communicates with the target ECU for measurement and calibration. Siemens names INCA and CANape as examples. |
This division of responsibilities follows Siemens’ 2022 white paper on calibrating AUTOSAR-based ECUs with Capital VSTAR and XCP and its Capital VSTAR fact sheet.
How the configuration-to-calibration workflow fits together
- Start from the system model and ECU extract. Siemens describes OEM and supplier teams dividing work, with an ECU extract passed to a supplier for flattening and configuration. Establish which team owns the extract, the ECU description and later calibration deliverables before configuring modules.
- Configure the ECU in Capital VSTAR Integrator. The white paper discusses basic-software areas including MCAL, ECU state management, CAN, XCP, the operating system and the run-time environment. Configure only the modules and settings required by the ECU design; the paper does not define a universal set of values.
- Generate the ECU description and A2L. The ECU flat description carries component and service information, but Siemens says it does not itself contain address information. A2L generation uses XCP interface data for access methods and protocol configuration, plus addresses obtained from the executable map file.
- Import the A2L into an MC tool. Load the generated description into the selected MC application, such as Siemens’ named examples INCA or CANape. The A2L lets the tool identify supported parameters by name rather than requiring the user to work only with raw addresses.
- Establish the XCP connection and perform the required operations. The described sequence includes session setup, calibration-page selection, memory access and synchronous data transfer. The MC tool exchanges commands with the ECU over the configured XCP transport.
The sequence is a toolchain outline, not a turnkey recipe: it does not supply ECU-specific module values, addresses, transport settings, or hardware and software pairings.
How Capital VSTAR generates an A2L handoff
The A2L bridges ECU software configuration and the MC tool. In Siemens’ account, it brings together the ECU flat description, XCP interface data and address information drawn from the executable map file. Those inputs matter together: a description of calibration objects without the target executable’s address information would not provide the same complete access description, while XCP interface data communicates how the tool is expected to access the ECU.
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After generation, check that the description corresponds to the executable and XCP configuration being used on the target. The white paper explains the inputs and purpose of the handoff, but does not prescribe a universal build process or validate a particular project’s generated file.
What is needed for XCP calibration
XCP calibration is an end-to-end arrangement, not a property of the MC tool or adapter alone. Siemens identifies four linked elements: the target ECU, an embedded XCP driver, an MC tool running on a PC, and an interface between the tool and ECU. The driver and the configured transport/interface details determine how the session can be established.
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- The target executable and its associated map information must align with the A2L used by the MC tool.
- The ECU must include and configure the embedded XCP driver for the intended access and transport.
- The MC tool must be able to consume the A2L and support the measurement and calibration operations the project needs.
- The interface and transport must be compatible with the target-side configuration.
These are compatibility checks, not a claim that any XCP-capable adapter, ECU or software combination will work. The Siemens paper outlines session and data-transfer concepts but does not state project-specific wiring, transport parameters or setup commands.
Where ECU calibration complexity enters
Siemens describes calibration work involving large parameter sets, interactions among software functions and ECUs, work split between OEMs and suppliers, and vehicle variants and markets. The paper characterizes complex ECU programs as involving “thousands of calibration parameters”; that is a qualitative scale description, not a measured count for every ECU. Such complexity makes ownership and version alignment important: teams need to know which ECU extract, executable, A2L and calibration configuration belong together.
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How to assess compatibility for a specific project
Do not infer a complete compatibility matrix from product-family claims. Siemens’ current Capital Embedded portfolio page refers to AUTOSAR R20-11 support, but that adjacent portfolio statement does not establish the supported combinations for a particular Capital VSTAR release, ECU or compiler. The Capital VSTAR fact sheet is dated 2020 and should not be treated as a current release matrix. See the Siemens AUTOSAR Embedded Software Implementation page for the portfolio context.
- Confirm the Capital VSTAR version and its compatibility with the project’s ECU extract and AUTOSAR configuration.
- Check support for the target MCU, MCAL, compiler and executable map format.
- Verify the XCP transport and interface against the ECU’s embedded driver configuration.
- Confirm that the chosen MC tool can import the generated A2L and perform the required operations.
- Agree on supplier/OEM handoffs and how descriptions and calibration data will be maintained across ECU and vehicle variants.
Exact pairings should be confirmed with Siemens and the project’s suppliers; the cited product material does not provide a current project-by-project compatibility matrix or independent product benchmark.
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What Capital VSTAR Virtualizer contributes
Siemens positions Capital VSTAR Virtualizer as a simulation and execution environment usable across development activities, including calibration and testing. Its Virtual ECU software development fact sheet does not establish that every physical ECU calibration workflow, transport or interface is reproduced in Virtualizer. Treat simulation as an adjacent development option, and verify the specific virtualized setup needed rather than assuming it replaces the physical ECU/XCP path.
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