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[Debug][Keil][VSCode] How to debug Keil's STM32 project in VSCode?

Assumptions:
  1. STM32CubeIDE needs to be installed. At the time of writing this guide, STM32CubeIDE version is 1.6.1 Build: 9958_20210326_1446 (UTC).
    OpenOCD and GDB server are already preinstalled in STM32CubeIDE, so no need to install separately;
  2. Keil's .uvprojx project needs to be built to .elf file (generated from .axf file);
    Used command:
    Code:
    fromelf.exe example_in.axf --elf --output example_out.elf"
  3. VSCode has plugins: “C/C++” and “Cortex-Debug”.
Steps:
Generate the STM32CubeIDE project for your MCU to get Debug Configuration File for OpenOCD.
To do that, follow [Debug][Keil][STM32CubeIDE] How to debug Keil's STM32 project in STM32CubeIDE? (Part 1)

Open Keil's Project location by “Open with Code” integrated menu in Windows - the place where you have /Src, /Inc, etc.
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NOTE: If you are missing "Open with Code" option in Context Menu, then reinstall VSCode and make sure that you have checked these options:
1620337306019.png


Create “launch.json” file by hitting F1 in VSCode (which corresponds to “Menu->View->Command Palette”) and start typing “launch”.
Select “Debug: Open launch.json” and then select “Cortex Debug”.
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Copy-paste the following template to the newly created “launch.json”:
JSON:
{
  "version": "0.2.0",
  "trace": true,
  "configurations": [
    {
      "name": "Debug stm32 template",
      "type": "cortex-debug",
      "request": "launch",
      "servertype": "openocd",
      "device": "not required to specify here",
      "executable": "${workspaceFolder}/relative/path/to/elf/file.elf",
      "gdbPath": "absolute/path/to/arm-none-eabi-gdb.exe",            // it is required, only if not in PATH
      "serverpath": "absolute/path/to/openocd.exe",                   // it is required, only if not in PATH
      "cwd": "${workspaceRoot}/relative/path/to/dir/with/uvprojx/or/uvproj/project/file/dir",
      "configFiles": [
        "${workspaceFolder}/relative/path/to/generated/in/STM32CubeIDE/debug/configuration/file_Debug.cfg"
      ],
      "searchDir": [
        "absolute/path/to/openocd/st_scripts",
        "or/absolute/path/to/openocd/scripts/with/board/interface/and/target/inside"
      ]
    }
  ]
}

Mine “launch.json” looks as follows:
JSON:
{
  "version": "0.2.0",
  "trace": true,
  "configurations": [
    {
      "name": "Debug stm32",
      "type": "cortex-debug",
      "request": "launch",
      "servertype": "openocd",
      "device": "not required to specify here",
      "executable": "${workspaceFolder}/ci_tmp/[DBG]_UC_PRODUCT_APP/[DBG]_UC_PRODUCT_APP.elf",
      "gdbPath": "C:/ST/STM32CubeIDE_1.6.1/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.9-2020-q2-update.win32_1.5.0.202011040924/tools/bin/arm-none-eabi-gdb.exe",
      "serverpath": "C:/ST/STM32CubeIDE_1.6.1/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.externaltools.openocd.win32_1.6.0.202101291314/tools/bin/openocd.exe",
      "cwd": "${workspaceRoot}/Projects/MDK-ARM",
      "configFiles": [
        "${workspaceFolder}/Application/project_CubeMX/CubeMX_UC_PRODUCT_APP/CubeMX_UC_PRODUCT_APP_Debug.cfg"
      ],
      "searchDir": [
        "C:/ST/STM32CubeIDE_1.6.1/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.debug.openocd_1.6.0.202102111023/resources/openocd/st_scripts"
      ]
    }
  ]
}

Hit F5 in VSCode (which corresponds to “Menu->Run->Start Debugging”) and start debugging in VSCode!
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Hope it was helpful for someone there.

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