| It has been in an information times because of the prevalence formobile and Internet in our country. It can't satisfy the customers'requirement for the traditional single function. So more fashionableout-look, more functions and more convenient operation is the requirementsof the public telephone for the people. The appearance of the multi-mediapublic telephone is the product which meets with the times'requirement.The system, based on the traditional public telephone function,integrates the newest embedded technology, wireless communicationtechnology and network technology. Besides the dialing local, national andinternational, user can surf in the Internet all day to look over all kinds ofinformation, receive/send messages and email using this kind of telephone.The design of hardware selects S3C44B0 processor based on the ARM7kernel. The part of wireless communication uses more prevalent GSMmodule with the function of GPRS which belongs to the series of WISMOof Wave Company in French. At the same time, liquid-crystal displaytechnique is adopted. With the size of 320×240, 8bit big colorful screenwhich is easy operational, colorful outlook and friendly interface.Embedded system uses the Delta System which is made inYINKEJINGCHENG. Three kinds of debug style, ROM, LOAD, DEBUGdeveloped in C++ language, are supported by the operate system. The paperdiscusses the several parts design of the application tier under the support ofthe operate system. These parts include the program design of the messagemodule, multi-media information query module, shoot data collect moduleand the extend series chip driver program debug of the bottom ST16c554.Furthermore, there are two assistance works; one is to transplant the fiveinput methods which are full-spelling, capitalization, lowercase andpunctuation, into the system; the other is to add two user-defined font bases.The hardware part implementation of the message module needs GSMmodule and processor to be finished together. GSM module and ARMprocessor are connected through the series2. The speed of the seriescommunication between the GSM module and micro-controller can reach tothe full out of 115200b/s. AT order set is the communication protocolbetween the module and controller. Processor receives and sends AT orderthrough series and forms the loop with the GSM module, and then realizesthe message receiving and sending.The software part of the message moduleincludes two part tasks: one, finished in the file of "gsmsms.cpp", is themiddle process function connecting the bottom tier and user interface. Itfinished the data formatting process of the message receiving and sending,and offers interface function to the GUI. At the same time, it sends the ATorders to the series2, receives the data which are returned by the GSMmodule through transferring the interface function offered by the bottom.Driver tier offers the interface function for the application tier, but theapplication can control bottom hardware directly, or it will make theconfusion for the system running and appear the abnormal phenomena. Theother part is the design of the message user interface. Information query part carries out the data store management with fileformat, offers the newest information query to the customers. File systemsupports five class contents, but the information query part is designedaccording to the third class which displays the query information throughthe three class contents selecting to confirm the query content. Theinformation query part is only an empty module. The content displayed isread from the files. The updating for the query content is done under thestate of the GPRS down-load data transporting through the GSM module.DeltaOS supports the file system creation and management. The creation isfinished during the task initialization, after that, creates the files and readswrites files orderly, and then, finishes the initialization work. Shoot module implements the collection of one frame image mainly.C328-760 model series shoot is easy to be connected for its hardware. Hex...
|
PDF Full Text Request