Debug session "hangs" immediately and "pause" button on debug toolbar does nothing

RE: Debug session "hangs" immediately and "pause" button on debug toolbar does nothing

PaulJ — Tue, 15 Apr 2025 01:50:21 GMT

OK thanks. I added the command to the launch.json file and now it isn't automatically reprogramming the device at the start of a debug session. I also found this line in the board.cmake file that appears to set the speed for the JLink: board_runner_args(jlink "--device=nRF52840_xxAA" "--speed=500"). Note that I have set it to 500 for my application. I was still unable to start a debug session, but I managed to talk to the device with JLink Commander and I can see that the Stack Pointer is not set correctly. I will now dig into the mountains of config files to figure out which one sets up the various memory boundaries and set it correctly for my device (I found it while digging around earlier but seem to have forgotten what it is called and where it resides). I have wasted enough of your time on this so I am going to label this as solved since you have explained how to slow down the Jlink speed and remove the auto program.

RE: Debug session "hangs" immediately and "pause" button on debug toolbar does nothing

Kazi Afroza Sultana — Mon, 14 Apr 2025 14:57:01 GMT

Hello,

You can disable the automatic flashing that occurs when starting a debug session:

Go to VS Code Settings
Navigate to User → nRF Connect → Debugging:Flash
Disable this setting

Or you can set the following line to the configuration section of your launch.json file:

"flash": false

(+) Frustrated with nrf5340 & vscode - Restarting debugging will reflash the firmware again! - Nordic Q&A - Nordic DevZone - Nordic DevZone

I alos have seen that you can set target speed for SWD from J-Link RTT Viewer

RE: Debug session "hangs" immediately and "pause" button on debug toolbar does nothing

PaulJ — Thu, 10 Apr 2025 15:43:44 GMT

Hi Kazi

The problem lies with the "Debug" icon from the VS screen. If I click on that, it always reprograms the cpu. How do I set this programming speed? Or is there a way to stop it from programming the CPU and then I can program manually from nRF Command Line Tools and jump to a debug session without a re-programming?

Thanks

Paul

RE: Debug session "hangs" immediately and "pause" button on debug toolbar does nothing

Kazi Afroza Sultana — Thu, 10 Apr 2025 06:50:44 GMT

Hello Paul,

Do you mean how nrfjprog command can be used?

Please read this documnentation Installing the nRF Command Line Tools.

You can run the command from command prompt of your system, from the toolchain manager app of nRF Connect for Desktop

and also form VS code terminal

RE: Debug session "hangs" immediately and "pause" button on debug toolbar does nothing

PaulJ — Wed, 09 Apr 2025 15:31:16 GMT

Thank you. And I apologize in advance for not being up to speed on all the configuration methods, but which file does this instruction go into? I would guess the json file?

RE: Debug session "hangs" immediately and "pause" button on debug toolbar does nothing

Kazi Afroza Sultana — Wed, 09 Apr 2025 09:54:12 GMT

Hello Paul,

You can use nrfjprog -r --clockspeed 10000 (or any specified value for your device) command.

nrfjprog commands

RE: Debug session "hangs" immediately and "pause" button on debug toolbar does nothing

PaulJ — Sun, 06 Apr 2025 16:26:28 GMT

Just wondering if you have found the answer to the need for a slower SWCLK clock speed for the programming phase?

Paul

RE: Debug session "hangs" immediately and "pause" button on debug toolbar does nothing

PaulJ — Wed, 02 Apr 2025 01:20:58 GMT

Hi, and thank you for the suggestion. I will confess that I have been trying to avoid learning the "devicetree" system but I guess I will need to dig into it to "unset" all the configurations that were set for the example I used to get started. My ultimate goal is to remove all these front end configurations and the RTOS. I am trying to design a canoe, not a cruise ship!

There is one question above that I would like to get answered before I go too much further; how do I slow down the SWCLK clock speed for the programming phase? It's currently running at 2MHz which is too fast for the hardware/cables that I have developed.

RE: Debug session "hangs" immediately and "pause" button on debug toolbar does nothing

Kazi Afroza Sultana — Tue, 01 Apr 2025 08:28:44 GMT

Hello,

I think you can try the workouts you mentioned in the case. If those don't help, can you check your custom application if the internal RC Oscillator is set? If not, you can set this my following configurations

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y