STM32 Programming Tutorial Notes

Introduction

• Tutorial for STM32 programming
• Led by Greidi
• Goals:
  • Control an LED
  • Handle an interrupt
  • Send data from STM32 to PC

Prerequisites

• Install STM32 CubeIDE

Setting Up STM32 CubeIDE

• Configure workspace without spaces in project names (use underscores)
• Use Create New STM32 Project option in CubeIDE
• Select STM32 Nucleo board (specifically F401RE)
• Configure project settings (keep defaults)

Project Structure

• Multiple projects can reside in a single workspace
• Use MCU/MPU Selector for custom boards
• STM32 provides HAL libraries for peripherals

Interface Overview

• GUI shows the STM32 chip configuration, including:
  • Oscillators
  • UART interface
  • Debug lines
  • Configured peripherals
• Recommended to download Nucleo schematic from STM32 website for reference

GPIO Configuration

• LED connected to PA5
• Switch connected to PC13 (configured as external interrupt)
• Pull-up resistors are used for switches

Interrupts

• Configure external interrupts in CubeIDE
• Options include: rising edge, falling edge, dual edge
• Falling edge trigger is recommended for a button press
• Use debounce capacitors to prevent multiple triggers

Writing Code for LED Control

• Write code in the main.c file under user code sections
• Use HAL_Delay for timing
• Example of blinking an LED:

  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);  
  HAL_Delay(1000);  
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET);  
  HAL_Delay(1000);  
  

UART Communication

• Configure UART in CubeIDE (USART)
• Use HAL_UART_Transmit to send data to PC
• Example message:

  char *message = "Hello World!";  
  HAL_UART_Transmit(&huart2, (uint8_t*)message, strlen(message), timeout);  
  

• Configuration: baud rate, word length, parity, etc.

Debugging

• Use software debuggers like PuTTY for UART communication
• Employ breakpoints in CubeIDE for debugging the code execution
• Monitor the UART output for data sent to PC

Conclusion

• Successfully configured and programmed STM32 to control an LED and send data to a PC
• Thanks to Greidi for the tutorial and viewers for their support.