Introduction: Communication UART Entre Raspberry Pi 4 Et Stm32F401RE

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UART (Universal Asynchronous Receiver Transmitter) communication is one of the simplest and most effective ways to exchange serial data between two microcontrollers or between a microcontroller and an embedded computer like the Raspberry Pi. This article details the setup of UART communication between a Raspberry Pi 4 and an STM32F401RE board using the STM32 HAL library and Python on the Pi.

Supplies

Raspberry Pi 4

STM32F401RE (Nucleo-64)

Fils Dupont

Adaptateur USB vers UART

Logiciel STM32CubeIDE

Step 1: Creating the Project in STM32CubeIDE

Fichier 1

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Step 2: UART Configuration on STM32 (via STM32CubeIDE)

Fichier 2

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Step 3: Modify the Main.c File

Après la génération du code C, il faut remplacer le fichier main.c par le fichier main.c joint ici.

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Step 4: Serial Interface Configuration on the Raspberry Pi

In the terminal, type :

sudo raspi-config

Using the arrow keys on your keyboard:

Go to "Interface Options" (or "Interfacing Options" on some versions)

Select "Serial Port"

You will see two successive questions:

  1. "Would you like a login shell to be accessible over serial?"
  2. Answer "No" (otherwise the port will be used by the console).
  3. "Would you like the serial port hardware to be enabled?"
  4. Answer "Yes"

Then, restart the Raspberry Pi.

sudo reboot

Step 5: Run the Uart.py Script

lancer le script uart.py

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