说明：  MSP430G2553单片机的串口控制程序，包含的两个工程分别下载到两个g2553单片机中使用spi连接方式从一个单片机控制另一个单片机的LED灯
(MSP430G2553 microcontroller serial port control procedures, including the two projects are downloaded to the microcontroller using two g2553 spi connection one MCU to another MCU LED lights)