Research And Realization Of Hand Free Profile Based On Bluetooth Techonogy

With the dramatically advance of computer hardware manufacturing technique, high-level embedded system products have arisen and been applied extensively. Meanwhile,the automobile technology,IT and embedded system bring along mutually, which boosts automobile electronization and digital technology.The amalgamation of embedded technology and automobile electron technology has been a new hot spot of development of automobile electron.Automobile electronization is considered as a revolution of the process of automobile technology development and the extent of automobile electronization is looked as critical symbol to justify modem automobile level. Meanwhile,Bluetooth technology,as a solution to short-instance interconnection in communication field,is applied to automobile communication field naturally.For adapting to the technology requirement in new era and tracking the up-to-date technological development,this paper organically combined the Bluetooth technology, embedded technology and automobile electron and put forward a solution to developing automobile electron product.The Hitachi Company's SH7660 large-scale integrated circuit resource is described in detail and used it as hardware developing platform of embedded system in this paper.Meanwhile,Japanese embedded industry architecture standard ITRON has been analyzed and/μItron4.0 embedded system has been researched deeply. Moreover,this paper organically combined Bluetooth specification,CCAP guideline,GSM manual and AT commands collection,which is constitutes the basic academic foundation of this paper.Based on the research above,the paper applied Bluetooth HFP to the vehicle-based hand-free phone system and carried out HLD,LLD,coding,test, cross-compiling codes with tool provided by Hitachi Company's HEW and embedding binary file into board by downloading tool,and then,developing the application simulation prototype and simulated building of vehicle-based dashboard on VC++6.0.This paper has realized a vehicle-based electronic system with the functions of answering incoming call,rejecting incoming call,hanging up call,dial outgoing call and others.Furthermore,extended functions has been realized,such as three way talking, incoming call number identification,voice recognization,tag recognization and volume remote control.Besides,with respect to realization of SDP and HFP in this paper,it has the characteristic of modularization.This system applied operating-system-independence of embedded software technology,which adds portability and maintenance of software.This technology can facilitate the addition of component introduced by this paper to more complicated vehicle-based system.