STM32G491RET6U Bare-Metal Bring-Up with FreeRTOS

This project provides a bare-metal bring-up of the STM32G491RET6U microcontroller with FreeRTOS integration. It sets up a minimal runtime environment, integrates a UART driver for printf(), and provides a command-line interface (CLI) for runtime interaction.

Core peripherals and demos include:

• UART logging (printf() enabled)
• I²C communication with an **OLED display and RTC demo **
• FreeRTOS multitasking with test cases and sample applications (LED blink, OLED, RTC)

The project is structured to support selective build flags for enabling CLI, FreeRTOS test cases, and peripheral demos.

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Target Information

• MCU: STM32G491RET6U
• Architecture: ARM Cortex-M4
• Toolchain: GNU Arm Embedded Toolchain (via CMake)
• Debugging: OpenOCD (configs under tools/)

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Features

• FreeRTOS Integration
  • Task creation, scheduling, and multitasking demos
  • Configurable test case builds
• UART Driver
  • printf() redirection to UART for logging
  • CLI interface for interactive commands
• I²C OLED Support
  • Example task displaying text/graphics
• RTC Support
  • RTC initialization with time/date setting and reading
  • Example FreeRTOS task showing RTC updates on OLED + UART
• Configurable Build Options
  • Enable/disable CLI, test cases, and sample apps with CMake flags
• Code Quality Tools
  • Integrated Uncrustify formatting rules
  • Example pipeline hooks for code style enforcement

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Tools

Uncrustify

• Config file: tools/uncrustify.cfg
• Format code:

uncrustify -c tools/uncrustify.cfg --replace --no-backup drivers/uart/*.c 

OpenOCD

• Configuration files are located in the tools/ directory.
• Example configuration file: tools/launch.json

Build Instructions

# Clone the repository
git clone https://github.com/yourusername/STM32-Boot.git
cd STM32-Boot

# For CLI
make cli 
# For FreeRTOS tests
make tests
#for freeRTOS samples
make samples