RE: How to capture nrf9160 modem traces using RTT?

C.T. — Tue, 24 Oct 2023 18:55:44 GMT

Thanks! It works!

RE: How to capture nrf9160 modem traces using RTT?

Charlie — Tue, 24 Oct 2023 14:13:41 GMT

Hi C.T.,

Sorry for confusing you, Cellular Monitor is the final release app of Trace Collector V2 preview. I will report this to do an update on documentation.

Here are the steps to collect modem traces from RTT for the NCS v2.4.2 SLM application.

1. Adding the following overaly-rtt-modem-trace.conf to your building configuration.

CONFIG_NRF_MODEM_LIB_TRACE=y
CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_RTT=y
CONFIG_USE_SEGGER_RTT=y

2. Build and program firmware to the device, then use the command in the following log to collect raw trace data.

H:\>nrfjprog --reset && JLinkRTTLogger -Device NRF9160_XXAA -If SWD -Speed 50000  C:/tmp/modemtraces.bin
Applying system reset.
Run.
SEGGER J-Link RTT Logger
Compiled Jun 28 2023 13:41:32
(c) 2016-2017 SEGGER Microcontroller GmbH, www.segger.com
         Solutions for real time microcontroller applications

Default logfile path: C:\Users\chs1\AppData\Roaming\SEGGER

------------------------------------------------------------


------------------------------------------------------------
Connected to:
  SEGGER J-Link (unknown)
  S/N: 960035261

Searching for RTT Control Block...OK.
3 up-channels found:
0: Terminal
1: modem_trace
2:
Selected RTT Channel description:
  Index: 1
  Name:  modem_trace
  Size:  1024 bytes.

Output file: C:/tmp/modemtraces.bin

Getting RTT data from target. Press any key to quit.
------------------------------------------------------------

Transfer rate: 1.41 KB/s Data written: 287.56 KB B
Shutting down... Done.

3. Open the modemtraces.bin file with WireShark through Cellular Monitor->Open trace file in Wireshark.

Best regards,

Charlie