STM32 Nucleo L476RG: Debugger Connection Lost I try uploading a blank project and receive a message saying the debugger connection is lost. I tried 5 different USB Mini Cables and uploaded successfully to a completely different Nucleo Board (H745ZI-Q).

SMaci.1 · ‎2021-04-15

This is the message I receive when debugging for the STM32 Nucleo L476RG Board:

STMicroelectronics ST-LINK GDB server. Version 5.8.0

Starting server with the following options:

Persistent Mode : Disabled

Logging Level : 1

Listen Port Number : 61234

Status Refresh Delay : 15s

Verbose Mode : Disabled

SWD Debug : Enabled

InitWhile : Enabled

Waiting for debugger connection...

Debugger connected

Debugger connection lost.

Shutting down...

What are the next steps in the debug process? I have updated the firmware as it asked and am also using the latest software for the IDE (1.6.1).

Firmware:

Version: V2J37M27

Build: Oct 22 2020 11:30:39

Software:

STM32CubeIDE 1.6.1

So I believe I am using the most up to date software. Thanks in advance!

Markus GIRDLAND · ‎2021-04-21

Hello there!

This issue seems very similar to another thread that is currently being investigated. I would suggest that you follow that thread and try out the suggestions provided by Mattias to see if you can get some additional information.

You can find that link here.

SFan.1 · ‎2021-08-03

Download STM32CubeProgrammer, select "Erasing & Programming" on the left, then do a "Full chip erase", problem solved for my case.