Instalation of Arduino and support for stm32 (stm32duino)

• follow instruction for your OS: Getting Started with Arduino and Genuino products

• open Arduino, then in the menu go to "File->Preferencies"

• in pref. dialogue click on "edit" icon next to "Aditional Board manager URLs:" and add new board manager url form stm32 support "https://dan.drown.org/stm32duino/package_STM32duino_index.json"

• click [OK] in all dialogues and open board manager (menu -> Tools -> Board: "XXXXXX"-> Boards Manager (at the top of list))
• in Boards Manager, type into search dialoguq "stm32" and then press [Install] "STM32F1xx/GD32F1xx boards by stm32duino version xxxx.xx.xx" and hit [Close] button.