嵌入式组合导航系统中多路异步串口系统的设计

在嵌入式组合导航系统中，对导航计算机进行串口扩展是实现导航计算机和多个异步串口导航设备进行数据通信的重要前提。针对目前的串口扩展法无法有效利用串口扩展芯片内部FIFO的问题，提出了一种基于数据拆分的串口扩展法，并依据该方法设计了以MSP430F149单片机和TL16C554A芯片为核心的多路异步串口系统。试验证明，该方法能有效地利用串口扩展芯片的内部FIFO，提高了系统的串口通信效率。

Design of Multiple Asynchronous Serial-Port Systems in the Embedded Integrated Navigation System

The design of multiple serial-ports system is important for the data communication between the navigation computer and navigation devices with serial-ports in the embedded integrated navigation system.But in the current extending methods,the inertial FIFO of the serial-port extending chip is not fully utilized.To solve this problem,a serial-port extending method based on data division is introduced.A multiple asynchronous serial-ports system is also designed according to the method,taking MSP430F149 and TL16C554A as cores.At last the experiment result shows that the method effectively utilizes the inertial FIFO of the serial-port extending chip,and promotes the efficiency of the serial-port communication.