用于MSP430F149进行异步串口通信，从串口接收数据，分析收到的数据包，然后根据算法进行运算，最后将结果从串口返回。数据包的结构见xieyi.h。-For MSP430F149 asynchronous serial communication, receiving data from the serial port, analyzing the data received packets, and then computing algorithm, and finally to return results from the serial port. Packet structure is shown in xieyi.h.