本文選題：嵌入式 + Internet��； 參考：《東華大學》2012年碩士論文

【摘要】：隨著網(wǎng)絡技術的發(fā)展,Internet已經滲透大眾生活和工業(yè)生產的方方面面.互聯(lián)網(wǎng)在經歷過“大型主機”、“服務器和PC”和“手機和移動互聯(lián)網(wǎng)終端”為載體的三個發(fā)展階段后,將逐步邁向以嵌入式設備為載體的第四個階段。而嵌入式設備具有體積小、實時性好、可靠性高、功能完善等特點。面向21世紀的嵌入式系統(tǒng)要求配備標準的一種或多種網(wǎng)絡通信接口,針對外部聯(lián)網(wǎng)要求,嵌入式設備必須配有通信接口,相應需要TCP/IP協(xié)議簇軟件支持。因此嵌入式設備和Internet的結合成為了一種必然趨勢,本文正是在此大背景之下所做的研究。 遠程監(jiān)控是指本地計算機以web作為通信平臺對遠端的計算機或設備進行監(jiān)測和控制。本課題是將Internet與嵌入式設備結合,使用本地計算機通過Internet對現(xiàn)場嵌入式設備及下位機進行遠程監(jiān)控。設計并實現(xiàn)了一個比較完整的網(wǎng)絡化監(jiān)控系統(tǒng)。該系統(tǒng)以步進電機為被控對象,以片上系統(tǒng)AT89S52作為步進電機的控制芯片,通過CAN通信與現(xiàn)場嵌入式系統(tǒng)鏈接,PC機通過Internet來訪問嵌入式系統(tǒng),對被控對象進行監(jiān)測與控制。全文的主要研究內容和創(chuàng)新點如下： 1.基于Interent的嵌入式遠程監(jiān)控網(wǎng)絡的總體架構設計�；贗nterenet的嵌入式遠程監(jiān)控網(wǎng)絡系統(tǒng)分為三大主體,即監(jiān)控端(PC機)、主控端和執(zhí)行端。其中監(jiān)控端是與主控端之間通過Interent進行通信,主控端與現(xiàn)場執(zhí)行端之間通過CAN總線進行通信。系統(tǒng)的整體框架為： 監(jiān)控端←Internet→主控端←CAN總線→現(xiàn)場執(zhí)行端 2.基于Internet的嵌入式遠程監(jiān)控網(wǎng)絡的主控端設計。主控端是基于Internet的嵌入式遠程監(jiān)控網(wǎng)絡承上啟下的部分,是基于S3C2440A來實現(xiàn)的,包括硬件和軟件設計。主控端硬件設計主要包括電源電路、復位電路、存儲器等外圍電路。主控端軟件設計實現(xiàn)了linux平臺下具有Internet和CAN雙向收發(fā)能力的軟件。主控端通過Internet通信接收監(jiān)控端的指令轉發(fā)執(zhí)行端或通過CAN總線接收執(zhí)行端的信息轉發(fā)監(jiān)控端。因此,主控端實現(xiàn)了Internet和CAN兩種通信的對接,是整個系統(tǒng)的紐帶。 3.基于Internet的嵌入式遠程監(jiān)控網(wǎng)絡的執(zhí)行端設計。執(zhí)行端設計實現(xiàn)了基于CAN通信的步進電機與旋轉編碼器的控制系統(tǒng),該系統(tǒng)通過CAN通信接收控制指令和發(fā)送運行狀態(tài),包括硬件和軟件設計。硬件設計利用AT89S52單片機、旋轉編碼器和光電耦合器來實現(xiàn)MCU對步進電機的控制；軟件設計通過定時器中斷和比較器中斷等實現(xiàn)了CAN接收函數(shù),CAN發(fā)送函數(shù)和步進電機的控制函數(shù)。 4.CAN和RS-232協(xié)議轉化器設計。該協(xié)議轉換器實現(xiàn)了CAN通信協(xié)議和RS-232協(xié)議的轉換,實現(xiàn)不具備CAN總線接口的設備可以直接掛接到總線網(wǎng)絡上,實現(xiàn)資源的重復利用。利用AT89S52單片機、SJA1000和PCA82C250構成硬件電路；軟件實現(xiàn)CAN中斷接收、CAN發(fā)送、串行中斷接收和串行發(fā)送等子函數(shù)。 5.CAN總線網(wǎng)絡實時性研究。提出了基于動態(tài)優(yōu)先級調度算法來改進CAN總線網(wǎng)絡的實時性。首先通過肯達爾模型計算出CAN網(wǎng)絡數(shù)據(jù)幀丟失概率、網(wǎng)絡阻塞概率和單個數(shù)據(jù)幀的等待時間與網(wǎng)絡負載的關系,然后提出動態(tài)優(yōu)先級調度算法,并通過仿真分析與標準CAN調度算法進行比較,動態(tài)優(yōu)先級調度算法能明顯改善CAN網(wǎng)絡的實時性。
[Abstract]:With the development of network technology, Internet has permeated all aspects of mass life and industrial production. After the three development stages of "mainframe", "server and PC" and "mobile phone and mobile internet terminal", the Internet will gradually move towards the fourth phases of the embedded device as the carrier. The equipment has the characteristics of small size, good real-time, high reliability and perfect function. The embedded system facing twenty-first Century requires a standard or a variety of network communication interfaces. In view of the requirements of the external networking, the embedded devices must be equipped with communication interfaces and need the support of the TCP/IP protocol cluster software. Therefore, embedded devices and Internet This combination is becoming an inevitable trend.
Remote monitoring means that the local computer monitors and controls the remote computer or equipment using web as the communication platform. This topic is to combine the Internet with the embedded equipment, use the local computer to monitor the field embedded equipment and the lower machine through Internet, and design and implement a relatively complete network monitoring system. The system takes the step motor as the controlled object, and uses the AT89S52 on the chip system as the control chip of the stepping motor. The system links the embedded system with the field embedded system through the CAN communication. The PC machine visits the embedded system through Internet to monitor and control the controlled object. The main content and innovation of the full text are as follows:
1. the overall architecture design of the embedded remote monitoring network based on Interent. The embedded remote monitoring network system based on Interenet is divided into three main bodies, namely, the monitoring terminal (PC machine), the master control end and the executive end. The monitoring terminal is communication between the main control terminal and the main control terminal through the Interent, and the main control terminal and the scene executes are carried out through the CAN bus. Communication. The overall framework of the system is:
Monitor terminal Internet to main control terminal CAN bus to field execution end.
2. the main control terminal of the embedded remote monitoring network based on Internet. The main control terminal is based on the Internet based embedded remote monitoring network. It is based on the S3C2440A, including the hardware and software design. The main control terminal hardware design mainly includes the power circuit, the reset circuit, the memory and other peripheral circuits. The design realizes the software with Internet and CAN bidirectional transmitting and receiving ability under the Linux platform. The main control terminal receives the directives of the monitoring terminal through the Internet communication and receives the information forwarding monitoring terminal through the CAN bus. Therefore, the main control terminal realizes the docking of two kinds of communication between Internet and CAN, and is the link of the whole system.
3. the design of the execution terminal of the embedded remote monitoring network based on Internet. The executive terminal designed and realized the control system of the step motor and rotary encoder based on CAN communication. The system receives the control instructions and sending running state through the CAN communication, including the hardware and software design. The hardware design uses the AT89S52 singlechip, the rotary encoder and the rotary encoder. The photoelectric coupler is used to control the step motor of MCU. The software design realizes the CAN receiving function, the CAN sending function and the control function of the stepping motor through the interruption of the timer and the comparator interruption.
4.CAN and RS-232 protocol converter design. The protocol converter realizes the conversion of the CAN communication protocol and the RS-232 protocol. The device that does not have the CAN bus interface can be directly attached to the bus network to realize the reuse of the resources. The hardware circuit is composed of AT89S52 MCU, SJA1000 and PCA82C250, and the software realizes CAN interrupt reception, C. AN sends, serial interrupt receive and serial transmission functions.
The real-time performance of 5.CAN bus network is studied. A dynamic priority scheduling algorithm is proposed to improve the real-time performance of the CAN bus network. First, the Kendal model is used to calculate the data frame loss probability, the network blocking probability and the waiting time of the single data frame and the network load, and then the dynamic priority scheduling algorithm is proposed. Compared with the standard CAN scheduling algorithm, the dynamic priority scheduling algorithm can significantly improve the real-time performance of CAN networks.
【學位授予單位】：東華大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TP368.1;TP277

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