2. Modify the example code to be able to send and receive signals:
a. If S1 is pressed, goes to ISR and sends a signal 0x56. With ISR if signal 0x56 received, turns on LED1 for 1 second, then resets the receive buffer interrupt flag.
b. If S2 is pressed, goes to ISR and sends a signal 0xA3. With ISR if signal 0xA3 received, turns on LED2 for 1 second, then resets the receive buffer interrupt flag. You can assume that only one switch is pressed at a time. You will need to enable the interrupt from the UCA0 peripheral. Use the loopback to test your communication on your own board. View the registers that control the UART module. Note what parity is used (odd/even/none).