MSP432P40 LaunchPad板，Energia编译器下如何使用Serial？
有4 个 UART，可是我只能用和仿真器连的那个，其他的怎么用呢？
Depending on your hardware you may have more than one pair of UART pins. By default, you can use “Serial” when using UART. You can use additional UART pins by calling “Serial1, Serial2, …” etc.
明确说可以Serial1, Serial2,.....,但就是编译时通不过，为啥？TI也忽悠人？
