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基于蓝牙技术的车载免提系统研究
摘要
蓝牙技术虽然出现不久,但已受到许多方面的关注。由于蓝牙产品具有体积小、功耗低等优点,使其可以方便的集成到几乎任何数字设备中,现已大量的应用于包括手机、PDA、笔记本电脑、打印机、数码相机等产品中,应用领域非常广泛。
通过对蓝牙技术的介绍,着重分析蓝牙技术在车载免提系统中的应用,介绍系统的硬件结构和通信过程,并对蓝牙技术在嵌入式系统中的应用提出了设想和展望。
本文首先对蓝牙技术的起源和发展前景进行了简要介绍,然后剖析了蓝牙通信协议体系和免提应用框架,在此基础上针对课题要求提出了一套蓝牙车载免提系统的解决方案,并从硬件和软件两方面对系统的设计进行了详细阐述。方案是以台湾天樱公司生产的CKM3蓝牙模块为核心芯片,该模块作为系统的无线收发装置,与蓝牙手机无线通信,并分别通过UART和PCM接口与微处理器和DSP连接通信。微处理器AT89C4051协调整个系统的运转情况,串口与蓝牙模块通信,I/O口驱动液晶显示。在软件设计中,分析了蓝牙设备之间通信连接的建立过程和蓝牙模块与单片机串口通信,用C语言作为编程语言,简洁地实现了系统需要的高级算法;建立了清晰的软件流程图。
关键词:蓝牙;音频网关;车载免提系统;免提应用规范;
Abstract
Bluetooth products have many advantages, such as small volume, low power, etc. Bluetooth technology has many applications including mobile phone, PDA, computer, printer, digital camera, and so on.
This paper introduces the Bluetooth briefly and emphases its application of the Bluetooth in car hands-free system, It describes the handware structure munication process of the system..At last,and finally also brings forward conceive and prospect of the application of Bluetooth in the embedded system.
This thesis introduced Bluetooth background and trend, analyzed Bluetooth Specification including Core protocol and Hand Free Profile, presented a plan of vehicle hands free system based on Bluetooth, and expatiated the plan from the software and hardware. CKM3 Bluetooth module made in Taiwan pany is the core chip in the plan. CKM3 is equivalent to a wireless dispatcher municates with Bluetooth mobile. Its UART and PCM port respectively connect to microcontroller and DSP. Microcontroller run the whole system in phase, its serial municated with Bluetooth module, I/O ports drived liquid crystal display the part of hardware, choosing chips、characteristic and designing interfaces were expatiated, calculated to abase the power consumption of system adequacily, rationally position the high power consumption devices to heat loss well. In the part of software, that course of Bluetooth munication and Bluetooth module munication is