How to use STM32 in the ARDUINO IDE

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Now is possible use some STM32 in the ARDUINO IDE.
For do this follow the steps below.

  • Launch Arduino IDE.
    Click on File menu and then Preferences
    The Preferences dialog will open, then add the following link to the Additional Boards Managers URLs field:
  • Click OK twice, see below.
  • Click on Tools menu and then “Boards > Boards Manager
    Next in the box n.4 type: stm32
    and install all the boards that appears (5, 6 and 7).
    See below.
  • Now select again: Tools > Boards and choose the STM32 board that you want to use.
    See below, I selected the NUCLEO L476RG
  • Now select: Mass Storage, see below.
  • And now select the COM port where is connected your NUCLEO L476RG, see below.
    Do not worry if it gives you an indication of a different board, in my case indicates NUCLEO F103RB.
    There is a problem of identification in the current IDE version but it works.

Remember: for address the I/O of the NUCLEO-XXX board you must refer to pinout of Arduino Uno R3, see below the light blue box (pin_1 … pin_19).

  • Now try to read one Digital InPut and send the result via USB Virtual-COM.
    Select: FILE > NEW
    and in the window that appear type the code below.
// Read InPut PIN and send the result over USB-Virtual COM

int pushButton = 2;

void setup() {

  // initialize serial communication at 9600 bits per second:


  // make the pushbutton's pin an input:

  pinMode(pushButton, INPUT);


void loop() {

  // read the input pin:

  int buttonState = digitalRead(pushButton);

  // print out the state of the button:


  delay(1);        // delay in between reads for stability

  • Compile 
  • Download 
  • and press the icon of the serial terminal

You must see something like below.

Below there is the button connection on the NUCLEO-L476RG.
When you press the button, in the terminal you must see 0, if you release the button you must see 1.
The button is Normally Open.