MSP430G2955: IO port simulates UART serial communication, sending and receiving function routines?

Hello, please ask a question:

Cannot use timer A (because the hardware UART serial port is already in use),The system clock adopts a built-in clock of 1MHz. The BAUd rate of the I/O port to simulate the UART serial port is 115200.

  Hope to provide reference routines, thank you very much!