UART APIs in Peripheral and Common SDK

[Aadishri GS]

What is the difference between APIs in below sections:

 app_uart_xxx  ( under nRF5 SDK v15.3.0 > API Reference > SDK common libraries) 

nrfx_uart_xxx ( under  nRF5 SDK v15.3.0 > API Reference > Peripheral drivers > Peripheral drivers )?

And I understand we must use the APIs which are NOT legacy. Please clarify

[Aadishri GS]

Kenneth said:

So there are various UART drivers and libraries in the nRF SDK, e.g. app_uart ("old" lib), libuarte ("new" lib), nrf_drv_uart ("old" driver) and nrfx_uarte ("new" driver).

 So these "old" parts are not obsolete? It can still be used?

[Kenneth]

No problem to use "old"  no.

Best regards,
Kenneth