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Date of registration: Sep 13th 2015

Posts: 2


Monday, September 14th 2015, 2:05pm

[SOLVED] GDB Server not connecting to nRF51822

What should the initial traffic from the GDB Server to a target look like?
I am using the nRF51 DK's debug out to program a board I have made. The nRF51 DK includes an OB debugger chip and a debug out to another nRF1822. I am not able to connect my board. Using Saleae's Logic analyzer and SWD protocol analyzer, the first four lines of the SWD traffic are attached.

- what is the first packet telling me? It says "OK" for the ACK, but then it continues sending packets to the access port.
- is there documentation on the SWD packets and/or videos on debugging SWD traffic?

Advice appreciated. Thank you.
HappyDay has attached the following file:
  • SWD_sniff.pdf (78.01 kB - 255 times downloaded - Last download: Yesterday, 12:13am)

This post has been edited 2 times, last edit by "HappyDay" (Sep 14th 2015, 2:11pm)

SEGGER - Niklas

Super Moderator

Date of registration: Oct 6th 2014

Posts: 1,691


Tuesday, September 29th 2015, 7:02pm

Hi HappyDay,

sorry for the delay in response.
Since you posted this thread, can I consider this issue as solved?: Failed to execute RAMCode for RAM check!

In case not, can you tell me the S/N of your J-Link OB? (Or, better, post the output of J-Link Commander?)

Best regards,
Would you like to be added to the J-Link software update notification list, so you get informed automatically when a new version becomes available?
Just write me a PM or in case you want to subscribe to it yourself, please use this link: Link
Notification for J-Link, J-Link Debugger, SystemView & J-Scope: Link
Notification for Embedded Studio: Link