RE: Connecting nRF9151 DKs via UART

Hakon — Fri, 23 May 2025 10:58:23 GMT

Hi,

[quote user=""]1. Is the best comm to establish the link between DK1 and DK2 a UART?[/quote]

Yes.

[quote user=""]2. If so, which is the best choice of UART number? My understanding is that UART0 is used by the USB and UART1 is also used (but I'm unsure). Is UART2 a good choice?[/quote]

Yes, UART2 is a fine choice.

[quote user=""]3. For the choice of UARTx, what are the proper pins to use?[/quote]

TX: P0.10
RX: P0.11
CTS: P0.13
RTS: P0.12

[quote user=""]4. If I want to make the comm very reliable, should the RTS and CTS pins be used or are they not necessary?[/quote]

They are not necessary but can be added for reliability in case of noise.

[quote user=""]5. Is a DT overlay file needed? Some videos and posts indicate that it is, but I'm unclear on the the exact changes needed. I saw the followiing in a video for configuring UART1, but I'm unsure if it is correct (pls correct as necessary):[/quote]

Yes, you definitely need an overlay.

[quote user=""]

6. What changes/additions are needed for the prj.conf? I saw the following in a video but I'm again unsure as to whether it is correct and complete (pls correct as necessary):

CONFIG_SERIAL=y

CONFIG_UART_ASYNC_API=y

CONFIG_UART_0_INTERRUPT_DRIVEN=n

CONFIG_UART_0_ASYNC=y

What is needed to use UART2?

[/quote]

I guess it would be something similar to this ticket https://devzone.nordicsemi.com/f/nordic-q-a/102325/using-uart1-or-uart2-on-nrf9160dk-asset-tracker-v2

[quote user=""]

7. In the application code, how is the UARTx referenced? Is the following correct?

const struct device *uart1 = DEVICE_DT_GET(DT_NODELABEL(uart1));

const struct device *uart2 = DEVICE_DT_GET(DT_NODELABEL(uart2));

[/quote]

Yes, it is correct.

RE: Connecting nRF9151 DKs via UART

frogrammer — Fri, 23 May 2025 00:02:20 GMT

Although I have nRF5340DK, I just followed the UART example from the Nordic Academy. It worked just fine.

here is the link : academy.nordicsemi.com/.../

As for the overlay, i think if you change the pins or change default settings you need to add it.