The Design And Implementation Of Embedded Mobile Electronic Reader Based On "YHFT"-DSP

With the rapid development of modem electronic technology and the widely application of the embedded system, the carrier of the world's culture-books, has changed from paper to magnetic disk or compact disk. To fulfill the needs of the mobile reading, Mobile Electronic Reader, the combination of hardware and software based on the embedded technology, is now entering our normal life. It has changed people's reading habits, meanwhile, it indicates the beginning of the era that people can read without paper. The research on Electronic Reader with completed function, stable system and cheap price has become the hot topic in the application of the embedded system.Firstly, the paper gives a brief description of the development of Mobile Electronic Book and introduces the high performance DSP, YHFT-D4B, developed independently by the Computer college of NUDT. The structure of the system, in which the YHFT-D4B is chosen as the kernel DSP, is brought forward.Secondly, the scheme of the embedded USB host system is presented after analyzing the USB Specification. The embedded USB host system selects the Philips ISP1761 to act as the USB Host interface chip. It contains the USB interface circuitry and the USB host software. And the so,ware is divided into three parts: USB host specification system, the USB Mass Storage Class system and the FAT file system.Thirdly, by deeply study on the document format of the BMP, JPEG, TXT and PDF file, the software design scheme of the Electronic Reader is proposed and completed.Finally, accoding to the requirement of the embedded Mobile Electronic Reader, a display system is designed in it. The display system includes the LCD module and the standard video output system which can connect televisions thought the AV port.