How to use 2 UARTS in nrf52840

[Moog]

I am having issues to use 2nd UART. When I run Keil in debug mode it shows me three UART registers. i) UART0 ii) UARTE0 iii) UARTE1

Is this UART0 and UARTE0 same thing?

#define NRF_UART0_BASE 0x40002000UL #define NRF_UARTE0_BASE 0x40002000UL

Both base address is same in “nrf52.h”. Please confirm is it the right address allocation? If there is any working example where both UART's working will be helpful.

[endnode]

UARTE0 is EasyDMA enabled instance of UART0 so you can use only one of them at the time.

[Moog]

How to use UARTE1 then? And what the base address for that? Any working example will be helpful? I want to use both UART's but don't know how to configure them.

[endnode]

First of all you can red full description of UART registers including starting addresses here in product specification (preliminary). But why aren't you using Nordic nRF5 SDK drivers and config files? It's so easy to configure any peripheral with it, you don't need to bother with any addresses then. See e.g..\examples\peripheral\uart\pca10056\blank\config\sdk_config.h file from nRF5 SDK v14.

[Jakub Rzeszutko]

Hi Moog,

You can start with an example I've recently prepared: devzone.nordicsemi.com/.../

Basically you can have two combinations: UART0 + UARTE1 or UARTE0 + UARTE1.