Plug & Play device for A2B bus testing
and debugging

A2Bridge is a compact USB tool designed for working with A2B (Automotive Audio Bus) technology.
It enables faster device testing and validation, communication troubleshooting, and more efficient workflows in the lab, car or on the production line.
 

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Plug & Play

The device works immediately after connecting - recognized as a standard sound card on on any OS.

Multichannel USB Audio

Up to 32 input/output audio channels, with selectable 16 / 24 / 32-bit resolution.

Easy Configuration

Drag & drop a simple JSON file - no additional tools required, no need to know all A2B bus details to play sound

Automated Testing

Ready to use python library for integration with your test environment

Open Source SDK

Open source Software Development Kit allowing you to write and execute your “C” code on A2Bridge

Technical Support

Direct access to the int2code team, with automotive expertise and support for real-world testing scenarios.

Competitive Pricing

More affordable than competing A2B tools — with no compromise on functionality or support.

Simple Command Line Interface

Easy-to-use command-line interface over UART for controlling basic actions and functionality.

A2B Bridge
A2Bridge open device

What is A2Bridge?

A2Bridge is a device that supports engineering teams in testing, diagnosing and tuningsystems based on A2B (Automotive Audio Bus) technology. It simplifies A2B slave’s or master’s validation, communication analysis, and fast test execution — in the lab, during integration in the car, or in production workflows.

Thanks to Plug & Play operation and configuration/extension capabilities, A2Bridge helps reduce verification and debugging time and improves test repeatability.

Who is A2Bridge for?

A2Bridge was designed for teams working with automotive systems who need a fast and reliable tool for A2B testing.

  • Sound engineers & integration teams
  • Hardware validation teams
  • R&D / prototyping teams
  • EOL production tests teams

Want to see how A2Bridge can improve testing in your team?

Get in touch - we’ll prepare an offer tailored to your use case and required quantity.

Request a Quote

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Company Information
Product Information

Documentation

All features overview

A2Bridge

If you want experience more how to use the A2Bridge in your projects, please refer to our to our User Guide or video Tutorials

USER GUIDE
VIDEO TUTORIALS
  • Host Interface
    • USB Audio Class 2.0 compatible
    • Supported OS: Win 10, Win 11, Linux , MacOS, Android (only stereo)
    • Compatible with standard OS drivers
    • Headphone and microphone endpoints
    • Command line interface over virtual UART port
    • Protobuf interface over virtual UART port with ready to use python library for test automation
    • Mass Storage Device (MSD) for storing and accessing configuration json file
    • 16 bit / 24 bit / 32 bit channels resolution
    • Multichannel audio under windows using ASIO4ALL or WDM-KS (Windows Driver Model – Kernel Streaming)
    • Device Firmware Update for flashing the device
  • No extra power supply needed
  • Optional USB port to provide additional power for bus-powered slaves (up to 50 W!)
  • A2B Bus
    • AD2435 A2B transceiver
    • Emulate A2B Master or Slave nodes
    • Easy configuration over json file
    • Autonomous startup with pre-configured A2B bus topology
    • Fully flexible audio channels routing (up to 32 up / down stream channels)
    • I2C protocols (mailboxes) tunneling over protobufs or SDK
    • Support bus powered slaves with ext. adapter up to 50W
  • Open-Source SDK for your custom, onboard, time critical software
  • 1 year warranty
  • Free firmware updates over lifetime
  • 4 status LEDs
  • Robust alu box

Use Cases

A2Bridge supports real-world scenarios — from lab testing and prototyping to validation and production line testing.

Head-Unit independent testing and validation of A2B audio boosters

Enable testing and validation of A2B audio boosters without any Head Unit hardware.

Simulate HU behavior to control and supervise one or multiple boosters on the A2B bus.

Support the full booster feature set: identification, mute/volume control, diagnostics, and state monitoring.

Allow rapid development of custom test and validation software.

Provide a stable, maintainable interface suitable for development, validation, and production test environments.

Communication with A2B audio boosters must meet stringent real-time requirements.

  • Control and status telegrams must be exchanged within dozens of milliseconds.

  • Periodic messages (booster state, thermal status, diagnostics) must be handled deterministically.

  • Missed deadlines can lead to invalid booster states, audio dropouts, or failed diagnostics.

This level of determinism cannot be achieved with standard A2B bus tools:

  • Typical A2B tools rely on a host PC for control and sequencing.

  • A non–real-time operating system and USB/Ethernet latencies prevent the host PC from keeping required message timing.

  • These tools do not allow real-time application code running directly on the device, making precise scheduling and reaction to periodic telegrams impossible.

A2Bridge replaces the Head Unit and acts as a standalone HU simulator optimized for real-time booster communication.

  • Runs user-defined application code directly on the A2Bridge eliminates host-PC timing jitter

  • Implements a dedicated multi-layer firmware to handle booster protocols deterministically.

  • Provides a C language, callback-based SDK [https://github.com/int2code/a2bridge] that abstracts protocol handling while guaranteeing timing constraints.

  • Ensures reliable handling of both periodic and command-based telegrams within strict real-time limits.

With A2Bridge, deterministic real-time communication with A2B audio boosters becomes possible—enabling standalone testing, validation, and production use without any Head Unit hardware.

Parallel to the custom application running on the A2Bridge, the test framework running on the host PC can still control over the URAT port custom application, A2B bus and USB audio channels streams realizing all needed test cases.



Use case – Automated control and validation of A2B audio amplifiers

A2Bridge can be used as a standalone automation controller for A2B audio amplifiers, enabling fully automated testing without a Head Unit or manual interaction. In this setup, A2Bridge acts as the master on the A2B bus while exposing a high-level control interface to external test systems via UART using a Protobuf-based protocol.

  • A2Bridge controls and supervises the A2B audio amplifier in real time (mute, volume, state control, diagnostics).

  • A lightweight Protobuf protocol over UART exposes these functions to a host test environment.

  • Python-based test frameworks (e.g. pytest) send commands and receive structured responses from A2Bridge.

  • Test cases validate amplifier behavior, error handling, and diagnostic results deterministically.

  • Automated regression testing of audio amplifiers on real hardware,

  • Reproducible test execution on every firmware or configuration change,

  • Early detection of protocol, timing, or stability regressions,

  • Scalable lab setups where multiple A2Bridge devices are controlled in parallel.

With A2Bridge, A2B audio amplifier testing becomes fully automatable, deterministic, and CI-ready—bridging the gap between embedded real-time control and modern software validation workflows.