Viewing NRF_LOG_INFO output

[morpho]

How could I view the logs outputted via NRF_LOG_INFO? Do I really have to set up the UART connection for it which means having UART driver in place?

[Håkon Alseth]

Hi,

 

How could I view the logs outputted via NRF_LOG_INFO? Do I really have to set up the UART connection for it which means having UART driver in place?

It supports two backends to be defined in sdk_config.h:

NRF_LOG_BACKEND_RTT_ENABLED

or:

NRF_LOG_BACKEND_UART_ENABLED

 

By setting NRF_LOG_BACKEND_RTT_ENABLED to '1' (and disabling the UART backend), you can use JLink RTT Viewer to see your prints.

 

Kind regards,

Håkon

[morpho]

After setting the flags in sdk_config, I still don't see any prints in the RTT viewer with these settings

[Håkon Alseth]

The sdk_config.h looks good.

Did you try other examples with similar settings for RTT?

 

Kind regards,

Håkon

[morpho]

Yes I have. Is there anything wrong I'm doing with RTTViewer itself? Please guide

[Håkon Alseth]

I am not sure why it does not work, your configuration should be good.

Q1: Are you testing on a nRF52840-DK? If not, can you try on a DK?

Q2: Does the firmware running on the nRF run as expected at this point in time?

Q3: If you enter debug mode, is it stuck somewhere?

 

Kind regards,

Håkon

[morpho]

1. That's what I have: https://imgur.com/a/YC4Mv8e

2. Yes

3. No

[morpho]

if you aren't sure, please assign this ticket to someone more senior perhaps? Also your replies are super late

[Håkon Alseth]

Hi,

 

Can you please try this file?

This is ble_app_hrs, compiled with RTT backend support:

6076.nrf52840_xxaa.hex

 

Output in JLinkRTTViewer:

 

If it still does not work, I would recommend that you contact Segger and report a bug related to the RTTViewer software.

 

Kind regards,

Håkon

[morpho]

I can't for some reason use NrfConnect to flash
https://ibb.co/5Y48wBH

[Håkon Alseth]

Hi,

 

Are you also seeing issues if you try to use nrfjprog directly?

nrfjprog --program <hex file> --sectorerase --verify --reset -f nrf52

 

If it still fails, could you also try calling nrfjprog with "--log"?

nrfjprog --recover -f nrf52 --log

 

Kind regards,

Håkon