Design and Implementation of iPod Control Module in Car Audio System

In order to solve the problem of accurately controlling the external iPod in the car audio system so that the powerful iPod device can serve the whole car audio system, This paper proposes a direct connection to connect the iPod with the car audio system, and accurately control the iPod peripherals through the software structure of receiving trigger, internal processing and response. This method divides the iPod control module into the application layer and the driver layer. The application layer receives the external event triggers, calls the API interface of the driver layer, and completes the corresponding action. It is the only event entry of the iPod control module. The driver layer is mainly responsible for controlling the realization of the sound function. The process engine mechanism well solves the complex data and the corresponding state management problems in the design process. Experimental results show that this method enhances system reusability and portability, and is especially suitable for mass production development.

Introduction

With the rapid development of the automobile industry and the electronics industry, the car audio has evolved from the original car radio into an integrated multimedia on-board electronic system integrating audio-visual entertainment, communication navigation and auxiliary driving functions. But as a typical embedded system, the car audio system can not provide enough storage resources, which requires the whole system to access the necessary external equipment, to enhance the entertainment of the car audio itself.