The example uses software loopback.
This can e verified by toggling an LED just before the re-transmission code (line 354). I have attached a sample project that demonstrates the same.
It can be observed that LED toggles for each character that is entered.
In the example, I have toggled the red LED only. Please ensure that the pin assignments to the LED are given correctly in your design.
Thanks and regards
Thank you for your help! I did not get the LED indication showing, but the problem turned out to be with the Pioneer board. My colleague removed R34, R36, R47, and R52 from the board, and now the UART code works and shows the indication. Thanks!