Arduino 2

Arduino IDE 2 with STM32 core 2.8.x supports debugging

Crap UI employs electron, refuses to launch with ImDisk

• first workaround:  launch from msys64/ucrt64.exe bash terminal:
    $ Arduino2/ArduinoIDE.exe
• fix:  replace ImDisk with Ultra RAMdisk Lite
  Perhaps eventually, tmdcos / ramdisk

VSCode-Arduino runs and builds, arguably better than Arduino 2,
  but is about half-baked and tricky (impossible?) to configure
  (e.g. STM32CubeProgrammer)

The plan

add USB MIDI for STM32
- understand Arduino 2 libraries
- understand STM32duino library integration
- getting full function probably wants debugging

First steps

Install Arduino 2 IDE;
Configure Arduino 2 to use STM32duino and ST-Link
How to program and debug the STM32 using the Arduino IDE and ST-Link
- git repository
- add libraries, starting with MIDIUSB and USBLibrarySTM32

Visual Studio, VisualGDB ($99?) and ST-Link for STM32duino