How to capture nrf9160 modem traces using RTT?

Question

From here: 
 https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_trace_collector%2FUG%2Ftrace_collector%2Fcollect_modem_trace_custom.html 
 It says it is possible to collect traces via RTT. How to do this exactly? I'm using a custom board running the Nordic SLM application. I've set: 
 CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_RTT=y 
 The documentation says to use Trace Collector V2 preview. Where can I find the Trace Collector V2 application? 
 Cellular Monitor v2.0.1 complains it "Couldn't identify trace serial port"

Charlie · Accepted Answer

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

How to capture nrf9160 modem traces using RTT?

Top Replies