基于MSP430G2553低价格低功耗系列平台。本程序为新拿到手的langhpad提供开箱上电测试，按键控制LED间隔一秒闪。(Based on MSP430G2553 low price and low power series platform. This program provides open box power on test for the newly acquired langhpad, and the key control LED interval is one second