How to run UART using just RX, TX on custom PCB with nRF52840

RE: How to run UART using just RX, TX on custom PCB with nRF52840

Vidar Berg — Fri, 17 Dec 2021 08:42:03 GMT

To select a pin on Port 1 you can simply offset the pin number you want with '32'. For instance, if you want to assign TX to P1.10:

NRF_LOG_BACKEND_UART_TX_PIN (10 /* pin number */ + 32 /* Offset for port 1 */) // Select P1.10

RE: How to run UART using just RX, TX on custom PCB with nRF52840

Kubek — Thu, 16 Dec 2021 18:38:45 GMT

Thank you so much. So easy and simple!
I have just a one additional question - in "sdk_config.h" TX pin is defined with just a number, that means pin P0.given_number. What if I want to assign some pin from P1? It's impossible to include "nrf_gpio.h" file, because after this include whole code becomes "inactive" (like it's inside #ifdef that's false).

RE: How to run UART using just RX, TX on custom PCB with nRF52840

Vidar Berg — Thu, 16 Dec 2021 11:52:16 GMT

Hi,

I'd recommend using the Logger module if you only want to output data. It doesn't use the RX pin either, so you only need to select a TX pin in sdk_config here:

Best regards,

Vidar