When using Jlink Debug in STM32CubeIDE for Visual Studio Code, liveWatch cannot be used

[GGB1]

Under this configuration, the prompt indicates that the attribute "liveWatch" is not allowed.

        {
            "type": "jlinkgdbtarget",
            "request": "launch",
            "name": "STM32Cube: Launch JLink GDB Server",
            "origin": "snippet",
            "cwd": "${workspaceFolder}",
            "preBuild": "${command:st-stm32-ide-debug-launch.build}",
            "runEntry": "main",
            "imagesAndSymbols": [
                {
                    "imageFileName": "${command:st-stm32-ide-debug-launch.get-projects-binary-from-context1}"
                }
            ],
            "liveWatch": {
                "enabled": true,
                "samplesPerSecond": "4"
            }              
        },

This is the analysis conducted by GPT.

STM32CubeIDE for Visual Studio Code 3.10.0

JLinkDebugTargetAdapter correctly creates the Live Watch client.

However, the Live Watch client immediately issues

-var-create

while the target is running.

SEGGER J-Link GDB Server returns

Cannot execute this command while the target is running.

Use the "interrupt" command to stop the target and then try again.

Therefore all Live Watch variables remain

Not Available.

This works with ST-Link GDB Server because it apparently accepts -var-create while the target is running.

It seems the J-Link adapter should either

1. interrupt the target before issuing -var-create

or

2. create all variable objects before continuing execution.

[vincent_grenet]

​@GGB1 
Live Watch variables are not yet supported for Segger J-Link. This feature is part of the roadmap, but no release date is available at this time.

[GGB1]

OK. I'm really looking forward to this.

[Cartu38 OpenDev]

​@GGB1 

I’m not Segger JLink skilled at all so no accurate comment here.

If you are maybe so called generic debug launch template usage may help you see 

 

[GGB1]

谢谢。我回去看看。

[gabor-budai]

You can use the cortex-debug extension instead. Here's an example configuration:

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Example",
      "type": "cortex-debug",
      "executable": "${command:cmake.launchTargetPath}",
      "request": "launch",
      "servertype": "jlink",
      "device": "STM32H753ZI",
      "interface": "swd",
      "armToolchainPath": ".../arm-gnu-toolchain/15.3.1/bin",
        "liveWatch": {
            "enabled": true,
            "samplesPerSecond": 20
        },      
    },    
  ]
}

Alternatively, you can refer to the J-Link documentation for a more detailed setup guide.

[GGB1]

Thank you very much. This looks very interesting.