DFU Bootloader

This repository contains a generic USB device bootloader firmware for STM32 controllers.

Features

• Fully-featured DFU class (with support to STMicroelectronics protocol Extension) USB device
• Small footprint: consumes only 8kB flash with -Os (50% smaller than the STM32Cube solution)
• The DFU interface is allocated to a fixed address, so it can be mounted on the application's USB device, allowing convenient entry to firmware update mode
• Easy to port on virtually any STM32 device that is supported by STM32_XPD
• C# CLI application available for performing the update: LibUsbDfu

How to build

Simply run make with the following arguments:

| Symbol Name | Use | :----------------- | :------------------------ | SERIES | The series of the STM32 device | TARGET_HEADER | String of the device-specific STM32_XPD header | APP_ADDRESS | Value of the application's flash start address | APP_SIZE | The total available flash space for the application in bytes | TOTAL_ERASE_MS | Average erase time of the application flash area | VID | Vendor ID of the USB device in hexadecimal format (no prefix) | PID | Product ID of the USB device in hexadecimal format (no prefix) | DFUSE | Set to 1 if DFUSE protocol is desired | DESC_STR | DFUSE specific flash layout descriptor string | BINPATH | Path to build toolchain binaries (/usr/bin by default)

An example for an STM32F042K6 device with (VID,PID)={FFFF,FFFF}:

make TARGET_HEADER="\<stm32f042x6.h\>" SERIES=STM32F0 APP_ADDRESS=0x08002000 APP_SIZE=24568 TOTAL_ERASE_MS=480 VID=FFFF PID=FFFF

Further examples can be found in .travis.yml.

Built with GCC. (arm-atollic-eabi- is preferred over arm-none-eabi- as it provides better size optimization)