Automotive BAP Protocol

The integration of modern entertainment media into the vehicle and the integration of vehicle functions into infotainment components are becoming increasingly important. For example, with its Media-IN system, Volkswagen is offering the integration of an iPod and USB media into the infotainment scenery of the vehicle. In order to allow low-cost implementation, an abstract interface between the control units is used to reduce and largely eliminate brand dependencies. The vast use of media in-vehicle infotainment is easy and simple with the use of BAP protocol.

In automotive technology, there are the driver assistance systems which support the driver by visual, tangible, and audible information while driving his motor vehicle. These systems also take a different view of comfort and infotainment. Due to the various features of these systems, it is required to standardize the interfaces, operation, and display. To meet these requirements, the Hersteller Initiative Software (HIS) has developed a transfer protocol for the operation and display: The Biden und Anzeigeprotokoll nothing but the BAP Protocol. The Biden und Anzeigeprotokoll is structured according to the OSI reference model in layers and covering the layers from 2 to 7, so the data link layer, network layer, transport layer, session layer, and presentation layer. Below the data link layer, the physical layer with the transmission media is completed by the LIN bus or CAN bus. The functions of the layers 2 to 4 receives the BAP Communication Layer (BCL). The BAP Protocol Layer fulfils the functions of the session layer and the BAP Application Layer fulfils the presentation layer and the application layer. The presentation layer realizes the function of the specific adjustment to the application running at the application layer. The Biden und Anzeigeprotokoll has a strict separation of functions and representations, which is implemented through separate functional control units and display controllers. For example, the same communication devices can be used in different vehicles, and the displays with individual representation are provided.

The operating and display protocol (abbreviated BAP ) is a protocol within networked control units in motor vehicles, with which separation of function control devices and display control units is completed. The purpose of this separation is a simpler development of such now specialized ECUs. Within the OSI model, the BAP Protocol uses layers 2-7, layer 1 (sometimes also layer 2) adopts common protocols such as LIN, CAN, or Flexray. An example of the interaction between function and display control units is the activation of the climate function via operating menus in the vehicle.

The Business Unit Automotive & Mobility is the principal expert on developing and integrating the Biden und Anzeigeprotokoll (BAP) and has built up BAP domain knowledge over a period of more than 10 years working for leading companies in this industry. We integrated the BAP Protocol in-vehicle systems like Gateways, Connected Gateways, Body Control Modules, Camera Systems, Entertainment Head Units, Central Information Displays, Cockpit Systems, Instrument Clusters and many more electronic control units (ECU’s) in the domains Infotainment & Connectivity, Body & Security and Vehicle Telematics.

The operating and display protocol BAP has a current version: 1.7 is standardized communication between operating and display control units (DCU) on the one hand and function control units (FCU) on the other. The DCU displays information, sets new target values, and monitors of the functions. The FCU realizes these functions, reports changes, and is able to run without a DCU. 
On-board computers or head-up displays are examples of DCUs, whereas a tire
pressure controller is an example of an FCU.

BAP AUTOSAR framework and BAP Test framework

The BAP protocol kernel connects low-level automotive BUS technologies with upper-level software solutions used in various automotive instrumentation systems. This by exchanging control and display information between controllers via a standard and generic communication interface abstracting of the hardware from the application software. Next, to our traditional BAP services, we also develop and integrate BAP in an AUTOSAR framework. To guarantee the quality of our BAP services, we have our own automated verification & validation (testing) framework, that is free of use for our customers during project execution.

Infotainment & Connectivity domain

The Business Unit Automotive & Mobility has intensive know-how on developing embedded software in domain Infotainment & Connectivity to entertain, inform, and ensure convenient usage of mobile devices and connect with the outside world.

Body Electronics domain

The Business Unit Automotive & Mobility has intensive know-how on improving embedded software in the domain Body & Security herewith enhancing the comfort and security in and around tomorrow’s vehicles. They closely work together with our customers in order to develop state-of-the-art production class embedded software with the right quality, on time, and within budget.

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