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If your STM32 board does not have a bootloader yet and you want to be able to program it over USB, you'll have to upload the STM32duino bootloader to flash memory. See Burning the bootloader.

Arduino and Arduino_STM32

  • Download and install the official Arduino IDE. Versions 1.6.10 till 1.8.5 have been reported to work fine.
    • If you already have the Arduino IDE installed and it's a newer version, see the Boards Manager package method of installation.
      • Note: this method is deprecated and not supported in forum!
  • Run Arduino IDE, and open the menu Tools -> Boards -> Boards Manager. Install the "Arduino SAM Boards" package (includes the Arduino Due) from the list of available boards. This installs compiler support for ARM Cortex-M3.
  • Download a zip file containing the Arduino STM32 files from here.
  • Unzip the content of the zip file, and place the Arduino_STM32 folder to [Arduino sketches folder]/[hardware]/[Arduino_STM32]. Create the 'hardware' folder if it does not exist yet.

Example how the path should look like: C:\Users\\Documents\Arduino\hardware\Arduino_STM32

Operating system specific

Operating systems differ in how you get the USB hardware recognized.

Next steps

Refer to Uploading a sketch