What's the difference between the UART and Serial Port example?

[NattyDev]

I have the NRF52 DK, I run make flash in the UART example, everything works. I'm able to run the loopback test.

I navigate to the serial port example, make flash, nothing. Shouldn't it just work?

I've read I should be using the serial port library over the UART, it a bit frustrating that serial isn't working but UART is. I've tried it with SDK 16.0.0 and also 15.3.0. I hate to be asking such basic questions, but I don't see how based on the documentation I could be doing something wrong.

[Kenneth]

It's preferably to look at the libuarte library and example: 
https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsdk_nrf5_v16.0.0%2Flib_libuarte.html

Libuarte is the latest (and best I would say) UART implementation.

In general make sure that the RXD is pulled logic high, either by the peer have set this output high when not in use and/or by using a pull-up resistor if the peer may not be connected.

The main challenges with the nrf_serial library is that if there is an UART error (e.g. framing error), then you will need to uninit() and init() the library again.

Best regards,
Kenneth