The Research And Design Of The Electronic Mobile Seeing And Hearing Board Based On The ARM Embedded System

Nowadays, as the education developed quickly in China, the educationinstruments also changed a lot. With the spreading of the multimedia ineducation, the modern equipments such as computers and projectors were muchmore used. In another hand, the network technology especially the wirelessnetwork technology and embed system developed so much, and it makes it ispossible to change the traditional multimedia education methods into mobilenetwork methods.This paper shows a design of electronic mobile multimedia board which basedon the wireless network technology and embed system. This design uses thechip of ARM7 which is current today as the CPU (central processing unit). Thecore party of the embed system of this design is made up with the μC/OS-IIoperating system. This board can translate and receive images informationwhich is send to or from the main computer in the UDP mode used the wirelessnetwork card. For reducing the data which is sent from the server, the JPEG isused to translate the images. And we decode the images at the receiving point,then the image will be BMP model there. The images can be shown on the LCDscreen. The UI with the GUI images can increase the functions of extending thesystem and the abilities of the communicating between the computer and theuser. For storing the images, this design supports a great storing function withthe CF card interface.The particular jobs of the design are just as follows,Firstly, based the deep understanding of the wireless technology, this designchooses the HW-5600+ USB to build the wireless network receiver. The datareceiving storage system is built by PDIUSBD12, the USB interface, andLPC2210, ARM7 CPU series. It is researched the USB interface based on thepoint translating system in this paper. Under the help of the μC/OS-II, theprocess of this design is divided into four steps, USB interface controllingdriving, USB equipment driving, deliberations and applications. Then thetranslating from the wireless network card to the embed system storage wasdesigned.Secondly, on the design of the displaying system, for decreasing the data totranslate and increasing the reliability and the efficiency of the translating weshould press the data into JPEG model on the step of sending the messages.Then, before displaying the images, we should decompress the image files. TheMCU makes up the JPEG decodes. The codes should be furbished to 8x8square matrix and get the blocks as follow.entropy decode--quantify decode--reverse DCT --output factor of pulldeflection--8x8square matrixFor saving the storage, we make the inside subtract and conversing colors lineafter line. After the data is decoded to be BMP files, these data will be sent tothe displaying part of the system. The design of this part is currency. TheMiniGUI image user system is used in the design with the windows imageshowing to increase the functions of extending the functions of the design. Thispaper shows the method to design the GUI part under the μC/OS-II operatingsystem. The windows design, image and interface driving design, informationmechanism and cross compile theory can be found in this paper. All thedisplaying functions under GUI images are completed in this design.The CF card interface is also supported to the users for saving the importantimages in this design. The users can press a button to trigger the storage partyof the design and start the CF card storage. That can download the BMP filesbefore sending to the displaying party into the CF card. In the design of this part,the writing and reading functions of the CF card are designed with the GPIOinterface to simulate the ATA equipments interface. The designing principle ofthe ATA interface equipments driving and the principle of CF card storage canalso be found in this paper.For the limits of the time and the ability of the designer, some of the designconcepts including diversification of network receiving equipments, thecommunicating between the user and the computer have not been finished inthis paper. If all the imagines can be designed, the user will be more convenientand pleasant to use this system.As one of the multimedia products, this design is smaller, more portable,cheaper than other products. It can be used not only on the education area butalso can be used in the conference, office and advertisements. It will be muchmore useful in the future.