how do I do this?

Write code to both read and write data from the serial port in a "terminal" fashion: data from the keyboard is written to the serial port and data from the serial port is displayed on the screen. In order to do both reading and writing we must continously check the serial port to see if data is available, and only when data is available do we read the data and write it to the serial port. Write code to both read and write data from the serial port in a "terminal" fashion: data from the keyboard is written to the serial port and data from the serial port is displayed on the screen. In order to do both reading and writing we must continously check the serial port to see if data is available, and only when data is available do we read the data and write it to the serial port