Cannot establish RTT logger

[Terry]

Hi,

I am using Ubuntu 16.04 (64-bits) OS.

I installed JLink_Linux_V620b_x86_64.deb and was using nRF5x-Command-Line-Tools_9_6_0_Linux-x86_64.tar

I can capture the debug messages using UART.

I followed the instructions stated on devzone.nordicsemi.com/.../, but failed.

After executed JLinkExe and inputed some parameters, I could get

Connecting to target via SWD
Found SW-DP with ID 0x2BA01477
Found SW-DP with ID 0x2BA01477
Scanning AP map to find all available APs
AP[2]: Stopped AP scan as end of AP map has been reached
AP[0]: AHB-AP (IDR: 0x24770011)
AP[1]: JTAG-AP (IDR: 0x02880000)
Iterating through AP map to find AHB-AP to use
AP[0]: Core found
AP[0]: AHB-AP ROM base: 0xE00FF000
CPUID register: 0x410FC241. Implementer code: 0x41 (ARM)
Found Cortex-M4 r0p1, Little endian.
FPUnit: 6 code (BP) slots and 2 literal slots
CoreSight components:
ROMTbl[0] @ E00FF000
ROMTbl[0][0]: E000E000, CID: B105E00D, PID: 000BB00C SCS
ROMTbl[0][1]: E0001000, CID: B105E00D, PID: 003BB002 DWT
ROMTbl[0][2]: E0002000, CID: B105E00D, PID: 002BB003 FPB
ROMTbl[0][3]: E0000000, CID: B105E00D, PID: 003BB001 ITM
ROMTbl[0][4]: E0040000, CID: B105900D, PID: 000BB9A1 TPIU
ROMTbl[0][5]: E0041000, CID: B105900D, PID: 000BB925 ETM
Cortex-M4 identified.

However, after I executed JLinkRTTClient, I just got

###RTT Client: ************************************************************ 
###RTT Client: *           SEGGER MICROCONTROLLER GmbH & Co KG            * 
###RTT Client: *   Solutions for real time microcontroller applications   * 
###RTT Client: ************************************************************ 
###RTT Client: *                                                          * 
###RTT Client: *  (c) 2012 - 2016  SEGGER Microcontroller GmbH & Co KG    * 
###RTT Client: *                                                          * 
###RTT Client: *     www.segger.com     Support: [email protected]       * 
###RTT Client: *                                                          * 
###RTT Client: ************************************************************ 
###RTT Client: *                                                          * 
###RTT Client: * SEGGER J-Link RTT Client   Compiled Sep 22 2017 17:58:45 * 
###RTT Client: *                                                          * 
###RTT Client: ************************************************************ 

###RTT Client: -----------------------------------------------
###RTT Client: Connecting to J-Link RTT Server via localhost:19021 ...

Please help. Thanks.

Terry

[Bjørn Kvaale]

Could be useful to take a look at this case first. This forum post might also be helpful. I tried to install this using ubuntu 16.04 64 bit on a virtual machine now. It seems there is some issue with my usb connection. This is a well known problem that I have experienced multiple times unfortunately.

Which parameters did you input after executing JLinkExe? Are you using an nrf52 dk or an external J-Link as programmer? Also, which nrf are you using (e.g. 51822, 52832, 52840)?