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

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)