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Date of registration: Mar 23rd 2016

Posts: 9


Wednesday, March 23rd 2016, 1:00pm

Get often the Error: "Failed to start recording. RTT Control Block not found."


i've initially implemented the SystemView 2.32a tool into a DS-5 project.
I'm running FreeRTOS 8.2.3 on a LPC4350 M4 microcontroller while debugging with GDB Server 4.98a and J-Link Ultra+.

I'm using the default settings for SystemView and no FreeRTOS patch.
Only calling SEGGER_SYSVIEW_Conf(); in main() and the #include "SEGGER_SYSVIEW_FreeRTOS.h" statement at the end of FreeRTOSConfig.h.

On starting the SystemView recorder with Target Device LPC4350_M4, JTAG interface and manually RTT Control Block Address it will fail at least 8 out of 10 times with the error: "Failed to start recording. RTT Control Block not found."

Can anyone make suggestions whats going wrong there?

Thanks and best regards

SEGGER - Johannes

Super Moderator

Date of registration: Aug 31st 2012

Posts: 377


Thursday, March 24th 2016, 5:11pm


Could you update your J-Link Software to the latest version (V5.10u)?
Are you using SystemViewer, while GDB Server is running?
If your application is able to run stand-alone, can you try SystemViewer without GDB Server?

Best regards



Date of registration: Mar 23rd 2016

Posts: 9


Monday, April 4th 2016, 8:43am

Hi Johannes,

thank you for the quick reply.

Updating to the newest J-Link Software isn't possible for me because of the problem mentioned here.
Maybe you can also give an suggestion how to get the newest version running.

As a first step - using SystemView without GDB Server is working for me. After stopping GDB Server the start of SystemView works fine.

Thank you!
Best regards