MSP430串口发送，适合初学者使用。CPU是MSP430F149，外接晶振8M。Uart.c和Uart.h以后可在其他程序中直接调用-MSP430 serial transmission, suitable for beginners to use. CPU is MSP430F149, an external crystal 8M. Can be directly invoked in other programs after Uart.c and Uart.h