Connections for getting RTT log

[jeevan t raj]

Hi all,

We have a custom board based on nRF52840, and we are using the nrf52840 DK to program our board(For programming the chip, connection from DK to our board is made as per given below, Also not powering our board while programming).

nRF52-DK                 Custom / External Board


EXT_VTG(P19.1)--------------------> VDD


GND(P19.3)-----------------+------> GND
 /
EXT_GND_DETECT(P19.9) ---+

SWD IO (P19.2)-------------------> SWD IO

SWD CLK (P19.4)------------------> SWD CLK

We have two sensors connected to the 52840 and are of UART interface. In this case, we have chosen the RTT for debugging purposes. So our question is, in order to get the RTT debug logs, whether it is required to change the above connection we have used for programming?

Thanks in advance

[Henry_Chou]

SEGGER RTT log your connection is correct. But you have to set RTT enable in your sdk_config.h and compiler symbols.

[jeevan t raj]

Hi Henry,

Thanks for the quick reply.

yea as u mentioned we set the macros in sdk.config file as follows,

(sdk v17.0.2)

 NRF_LOG_ENABLED 1

NRF_LOG_BACKEND_UART_ENABLED 0

NRF_LOG_BACKEND_RTT_ENABLED 1

[Henry_Chou]

Yep! It's correct. You may try the customer board. I think it's okay. Except you have to define

NRF_LOG_USES_RTT=1 

in your project configuration.

[jeevan t raj]

We are using SDK v 17.0.xxx I think enabling of this NRF_LOG_USES_RTT is not required there,

can u pls confirm?