目前，ARM 处理器在嵌入式系统中得到了广泛的应用，但其通常只有3个及以下的串口，难以满足需要多串口设备的系统需求；分析研究基于 ARM 处理器的智能车载导航终端的多串口扩展问题，提出采用具有单串口扩展为5串口功能的串口扩展芯片GM8125，实现嵌入式系统的多串口扩展需求，并在串口通信中采用分层设计的方法，提高系统的稳定性和运行效率；该出租车智能移动导航终端系统经过实际调试与运行，能够实现预定功能且效果良好，能够应用到新型的智能交通调度系统中。%At present,the ARM processor has been widely used in embedded systems.But with only 3and the following serials,it is dif-ficult to meet the requirement of the system which needs multiple serial ports.Analysis of multiple serial extensions problem of intelligent ve-hicle navigation terminal based on ARM processor is made,and the expansion chip GM8125which can expand a single serial port into 5serial port serial ports is used to realize serial port expansion of embedded system.The hierarchical design method is used in the design of serial communication in order to improve the stability and efficiency of the operation of the system.The taxi intelligent mobile navigation terminal system is debugged and used for practical with the result of achieving the intended function and good effect,and it can be applied to intelligent transportation scheduling system model.
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