This is embarrassing but wanted to follow up. It turns out that the voltage signal coming into the UART port was not going through the full voltage swing from 3.3 to GND. This was due to incorrect wiring on our board. Thank you for the responses but ...
Hi TJ. Thanks for your response. Yes, transmit works fine and I can see both the Rx and Tx parts of the UART are set in the status bit. I'm going to recheck that I have the right pins. I know, that's an easy mistake to make, but I've check again and ...