How can I use UART for NRF debug logging and for own application purposes?

[Dusan Daniska]

I am debuggin using NRF_LOG over UART. Now I want to implement own UART functionality e.g. to configure the firmware. Is it possible to use the UART for both purposes?

[Jørgen Holmefjord]

Hi,

I would recommend that you use the command line interface (CLI) library in cooperation with NRF_LOG to achieve such functionality. You can enable CLI commands in NRF_LOG by setting the NRF_LOG_CLI_CMDS and NRF_CLI_LOG_BACKEND configs. Please have a look at the CLI example in the SDK.

Best regards,
Jørgen

[Dusan Daniska]

Thank you for the info. I'm playing with the CLI now. But can't link the project, I'm getting this error:

_build/nrf52832_xxaa/cli.c.o:(.rodata.m_cli_uart_transport+0x0): undefined reference to `nrf_cli_uart_transport_api'

I have

#define NRF_CLI_UART_ENABLED 1
#define NRF_FPRINTF_ENABLED 1

in my config file.

Is there something else that needs to be enabled to link the nfr_cli_uart_transport_api?

[Dusan Daniska]

I found where is the problem. I enabled the NRF_CLI_UART_ENABLED in my own config.h file, not in the sdk_config.h.

[brianreinhold]

I am struggling with the same. I had to comment out all NRF_LOG statements to build when I had my own UART. However, there is no NRF_CLI_UART related stuff in my sdk_config.h file.

The UART in my case is for communicating with another MCU. On the DK that UART is not used but I use button presses to simulate it.

I suppose the simplest solution is to conditional compile for DK or actual production device (where NRF_LOG cannot be used).