Pstn-based Intelligent Information Terminal Software Development

PSTN(public switched telephone network)is the most popular network in the world. It provides reliable transfers and costs less. In this regard, it's practical to develop intelligent information terminal software based on PSTN for convenience stores.In this subject, we analyze the actual demands and the feasibility to realize embedded system, establish the hardware platform and transplant uClinux. This paper focuses on UI module design, database module design, network transfers module design, input method module design and establishment of JFFS2 file system.UI module marks out the user interface with APIs provided by microwindows. It finishes information input and read, programs system flow.Database module manages the system database, programs the logistics information and system configuration.Network transfers module dials up with ppp(point-to-point protocol), and transfers information with TCP/IP. The transmission is initialed by the information terminal。Input method module accomplishes T9 input method, it translate figures key(0-9) into Chinese characters, English letters, numeric and punctuation. The inputmethod key manages the cut over of input method.After all the modules above finished, establish the JFFS2 file system on the platform. In this way, the goods information can be preserved and will not lose if power cut.