ASAM MCD-2MC Data Specification V1.6：A2L文件标准详解

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"A2L 文件标准1.6版并已经加了标签 ASAM_MCD-2MC Data Specification V1.6" A2L文件标准是ASAM（Association for Standardization of Automation and Measuring Systems，自动化与测量系统标准化协会）制定的一种用于描述汽车电子系统测量和校准数据的规范。这个标准的1.6版本提供了详细的数据规格，对学习和理解A2L文件的人员来说非常有价值。ASAM MCD-2MC是ASAM定义的一个子规范，专注于Multicore Diagnostic（多核诊断）的需求，特别是在汽车工程领域。在A2L文件中，包含了关于ECU（电子控制单元）和传感器/执行器的信息，如信号名称、物理单位、测量范围、校准参数等。这些信息对于开发、测试和维护汽车电子系统的工程师至关重要。1.6版本可能引入了新的功能、改进或修复了之前版本的问题，以适应不断发展的汽车技术。 ASAM MCD-2MC Data Specification V1.6的发布日期为2009年2月1日，由ASAM MCD-2MC工作组的多个公司成员共同编撰，包括Continental Automotive GmbH, dSPACE GmbH, ETAS GmbH, M&K GmbH, Robert Bosch GmbH, 和 Vector Informatik GmbH等。这些公司都是汽车工程和软件开发领域的领导者，他们的贡献确保了文档的专业性和实用性。文档的作者包括Hans-Georg Kunz, Hendrik Amsbeck, Thilo Wenzel, Bernd Wenzel, Hartmut Bauer, Peter Lampert, 和 Elke Schnorr等，他们为A2L文件的标准定义提供了专业知识和技术支持。文档类型被定义为“Specification”，表明这是一个技术规格说明，旨在指导开发者如何创建符合标准的A2L文件。请注意，尽管该文档经过精心编写，但ASAM并不保证其完全无误或一致。使用该文档时，用户自行承担风险，ASAM及其作者不对由此产生的任何损害或后果承担责任。ASAM保留对文档进行修订的权利，以适应技术发展和市场需求。 A2L文件标准的掌握对于汽车电子行业的工程师来说至关重要，因为它允许不同厂商之间的数据交换，促进了标准化和互操作性。通过学习这个标准，专业人士可以更有效地设计和调试汽车电子系统，从而提高整个行业的效率和产品质量。

Introduction

1.4.2 RESTRICTION FOR BRACKETS

ASAM MCD-2MC V1.6 requests always brackets of the form '/begin' '/end'. Curly brackets

'{' '}' are no longer supported.

1.4.3 W

IN32 APIS FOR SEED&KEY AND CHECKSUM CALCULATION

The definition of Win32 APIs for Seed&Key and checksum calculation which was formerly part of

the ASAM MCD-2MC V1.51 specification is no longer part of this specifiation. These definitions are

now found at [ASAM AE COMMON SEED&KEY].

1.5 ENCODING OF THE A2L FILE

ASAM MCD-2MC files are used in different language areas. To support the different

character sets used in the different language areas it is necessary to add to the ASAM

MCD-2MC file the information about the used character set.

The ASCII and ISO-8859-x character sets, defined for several language areas are not

sufficient. The ASAM MCD-2MC files needs to be exchangeable world wide.

1.5.1 U

NICODE TRANSFORMATION FORMAT

World wide exchange is supported by "Unicode Transformation Format" (UTF). Currently

there are 3 relevant versions of UTF available: UTF -8, UTF-16, UTF-32.

UTF-8 is compact and supports nearly every possible character world wide. Therefore

UTF-8 is the preferred encoding for ASAM MCD-2MC files.

Note:

Tools shall support at least UTF-8.

1.5.2 B

YTE-ORDER MARK

The encoding that is used for the ASAM MCD-2MC file is defined in a Byte-Order Mark

(BOM). The BOM is a byte sequence at the beginning of the ASAM MCD-2MC file.

Currently defined BOM sequences:

Table 3 byte-order mark coding

Bytes Encoding Form

00 00 FE FF UTF-32, big-endian

FF FE 00 00 UTF-32, little-endian

FE FF UTF-16, big-endian

FF FE UTF-16, little-endian

EF BB BF UTF-8

If no encoding can be detected, ISO-8859-1 (Latin-1) encoding is used.

Note:

For data type "ident" the restrictions listed in chapter 3.2 "Predefined data types"

are valid.

Note:

For user defined tags and enum values in AML the restrictions defined in chapter

5.2 "Format of the ASAM MCD-2MC Meta Language" are valid.

16 ASAM MCD-2MC Version 1.6

Division of the description data

2 DIVISION OF THE DESCRIPTION DATA

The definition of the ASAM MCD-2MC interface and hence the specification of the ASAM

MCD-2MC data base is aimed at defining a database independently of a computer or an

operating system in such a way that a transparent and manufacturer-independent

standard is established. As exchange format for such ECU descriptions *.a2l files are

used.

From the calibration point of view the database in accordance with the ASAM MCD-2MC

interface contains the complete description of all control unit relevant data in a project. A

project consists of project specific header, which is typically created by the project

manager, data and one or more control unit specific descriptions. These control unit

descriptions (= description of an ECU) include all conversion formulas and explanations

about the applicable (adjustable) and measurable (non-adjustable) quantities and present

a format description of the interface specific parameters. The measurement and

calibration system needs only to evaluate the quantities (and their conversion etc.), but

not the interface specific parameters. The latter are only passed on to the structures of the

driver. To make sure that these structures are correctly filled the MCD must know the

parameter type. The type is communicated with the ASAM MCD-2MC metalanguage. As

exchange format for such ECU IF Data descriptions *.aml files are used.

A project may include the control unit descriptions of various control units from different

suppliers. The descriptions differ in terms of content, but use a common information

storage methodology to allow for a global management of the project components. An

INCLUDE mechanism allows to summarize the various control unit descriptions of various

projects (Single-Source-Concept).

The ASAM MCD-2MC database thus consists of a number of different subcomponents

structured in accordance with the following diagram. The MODULE keyword denotes an

independent ECU or device.

PROJECT

{

HEADER{...} /* Project description */

MODULE Device

{

MOD_PAR{...} /* Control unit management data */

MOD_COMMON {...} /* Module-wide (ECU specific) definitions */

CHARACTERISTIC{...} /* Adjustable objects */

CHARACTERISTIC{...}

...

AXIS_PTS{...} /* Axis points objects */

AXIS_PTS{...}

...

MEASUREMENT{...} /* Measurement objects */

MEASUREMENT{...}

...

COMPU_METHOD{...} /* Conversion method */

COMPU_METHOD{...}

...

COMPU_TAB{...} /* Conversion tables */

COMPU_TAB{...}

ASAM MCD-2MC Version 1.6 17

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