Design And Implementation Of In-Vehicle Terminal’s Software Based On GPRS

With the rapid development of automotive electronic and mobile communication technology, in-vehicle terminals became a hot spot now. In-vehicle terminal is an automobile electronic device that integrates multiple functions into one car, integrating such as wireless internet access, in-vehicle navigation, voice call and information display and other functions to facilitate drivers and save space in the car. As extensions of the in-vehicle terminal, remote control is also a hot topic. Remote control combined with the in-vehicle terminal is the research basis of car networking.On the basis of a lot of information and a large number of documents both at home and abroad, designed an in-vehicle terminal that combines GPRS wireless communication and embedded system. The in-vehicle terminal enabled features such as wireless internet access, voice calls and text messages. On the basis of socket communication between cell phone and in-vehicle terminal, cell phone could control LED on the in-vehicle terminal, it basically reached the requirement that mobile phone controlled ignition and air conditioning switch.In the course of research, most of the work is software development. First of all, transplanted Linux to Embedded board, including cross-compilation toolchain, Bootloader, Linux kernel, root file system and device drivers, transplanted QT/Embedded and realized the visibility of the system. Then, the UI application of in-vehicle terminal in a QT environment was designed by using QT creator, and tested successfully on the in-vehicle terminal. Basing on the development platform of Android, android application of mobile phone was designed and it could realize remote control function. Last, by using socket communication, enabled remote control function.GPRS is the foundation of the research. Discussed layered structure of TCP/IP protocol, and realized wireless internet by using PPP of data chain layer. Voice call and message function was enabled with AT command and PDU coding way, and data could transfer between mobile phone and terminal by using AT+i command.Research results on this subject could be used on in-vehicle terminal, also provided a solution for other terminals, such as industrial control and security monitor.