【摘要】：當今社會,手機、家電、汽車、先進的醫(yī)療設備、網(wǎng)絡通信設備及其它帶有數(shù)字接口的器材設備得到了飛速發(fā)展,嵌入式系統(tǒng)技術在其中起到了關鍵的作用。而網(wǎng)絡通信功能則是嵌入式設備中最基本最重要的功能之一。因此,在嵌入式平臺基礎上,對實時嵌入式操作系統(tǒng)RTEMS(Real Time Executive for Multiprocessor Systems)的網(wǎng)絡功能進行擴展,具有重要的現(xiàn)實意義。RTEMS是一個免費開源的嵌入式實時操作系統(tǒng),最早服務于美國國防事業(yè),至1994年起一直由OAR公司負責版本開發(fā)與維護工作。它具有體積小、實時性強、源代碼公開等優(yōu)點,在眾多領域得到了廣泛應用。 課題對RTEMS操作系統(tǒng)網(wǎng)絡功能的擴展實現(xiàn),依托實驗室GX2410BP硬件開發(fā)平臺。GX2410_BP是一款基于三星S3C2410X處理器(ARM920T)的針對高校嵌入式教學和科研實驗的平臺,集成了豐富的外圍設備,相應配套軟件完善,為在該平臺基礎上擴展出一個網(wǎng)絡語音傳輸系統(tǒng)提供了可能。 本課題在深入學習網(wǎng)絡語音傳輸系統(tǒng)原理、嵌入式系統(tǒng)相關技術和SIP(Session Initialization Protocol)辦議標準的基礎上,研究并實現(xiàn)一個具有放音、錄音、通過網(wǎng)絡遠程傳輸音頻數(shù)據(jù)的網(wǎng)絡語音系統(tǒng)基礎平臺。結合網(wǎng)絡語音傳輸系統(tǒng)的需求和功能,開發(fā)了RTEMS系統(tǒng)針對GX2410BP的板級支持包(Board Support Package);開發(fā)了UDA1341音頻芯片驅(qū)動程序,以達到可以錄音、放音的目的；開發(fā)了DM9000網(wǎng)絡芯片驅(qū)動,為音頻數(shù)據(jù)在網(wǎng)絡上傳輸提供保障。實現(xiàn)中采用PJSIP作為本系統(tǒng)的SIP協(xié)議棧,PJSIP是一個開源的SIP協(xié)議庫,提供非常清晰的API和技術文檔,并具有非常好的移植性。 課題最后在應用層開發(fā)了相應程序?qū)υ撓到y(tǒng)進行了驗證,并指出了本設計的一些不足之處,提出了相應改進意見。
[Abstract]:Nowadays, mobile phones, household appliances, automobiles, advanced medical equipment, network communication equipment and other equipment with digital interface have been rapidly developed, embedded system technology has played a key role in it. Network communication is one of the most basic and important functions in embedded devices. Therefore, on the basis of embedded platform, the network function of RTEMS (Real time Executive for multiprocessor Systems) is extended, which has important practical significance. RTEMS is a free open source embedded real-time operating system. First served in American defense, OAR has been responsible for version development and maintenance since 1994. It has many advantages, such as small size, strong real-time, open source code, and has been widely used in many fields. Based on GX2410BP hardware development platform. GX2410BP is a platform based on Samsung S3C2410X processor (ARM920T) for embedded teaching and research experiments in colleges and universities. The corresponding software is perfect, which makes it possible to extend a network voice transmission system based on the platform. On the basis of deeply studying the principle of network voice transmission system, embedded system related technology and SIP (session initiation Protocol) standard, this paper studies and realizes a sound recording system with playback and recording. The basic platform of the network voice system for the remote transmission of audio data through the network. According to the requirements and functions of the network voice transmission system, a board support package for GX2410BP is developed in RTEMS system, the driver of UDA1341 audio chip is developed to achieve the purpose of recording and playback, and the DM9000 network chip driver is developed. Provides the safeguard for the audio data transmission over the network. PJSIP is an open source SIP protocol library, which provides very clear API and technical documentation, and has a very good portability. At last, the corresponding program is developed in the application layer to verify the system, and some shortcomings of the design are pointed out, and the corresponding improvement suggestions are put forward.
【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TN912.3;TP368.1

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