how to use two uart at the same time

[ps_anu]

 Hi...

i want to use two uart using nRF52840 ,, what are the things i need to configure and need to change ,,, 

send me sample program too 

[Edvin]

As long as you don't intend to use one of the UARTs for the NRF_LOG module, you can use the example found here as reference:

SDK15.3.0\examples\peripheral\serial_uartes

The example is described here.