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flash32w

Flash tool for STM32W based boards. Currently supports only boards with STM32F based USB-to-Serial device (i.e. STM32W-RFCKIT boards).

Features:

Flashing bootloader into STM32F USB-to-Serial interface
Flashing firmware to STM32W
Device information
STM32W Memory Dump

Due to poor implementation of CDC-ACM class in closed-source firmware, this tool is using libsub to directly communicate with SRM32F USB-to-Serial instead of using operating system CDC-ACM Class driver. This allows flashing on operating systems where use of original flash utility is not possible (Mac OS X, FreeBSD).

Requirements

It should work on any system which support libusb. In addition recent cmake is needed.

Building

$ cmake .
-- The C compiler identification is GNU 4.2.1
-- The CXX compiler identification is Clang 4.0.0
-- Checking whether C compiler has -isysroot
-- Checking whether C compiler has -isysroot - yes
-- Checking whether C compiler supports OSX deployment target flag
-- Checking whether C compiler supports OSX deployment target flag - yes
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Found libusb-1.0:
--  - Includes: /usr/local/include/libusb-1.0
--  - Libraries: /usr/local/lib/libusb-1.0.dylib
-- Configuring done
-- Generating done
-- Build files have been written to: /data/src/flash32w/1
$ make
Scanning dependencies of target flash32w
[ 25%] Building C object CMakeFiles/flash32w.dir/main.c.o
[ 50%] Building C object CMakeFiles/flash32w.dir/stm32w.c.o
[ 75%] Building C object CMakeFiles/flash32w.dir/stm32f.c.o
[100%] Building C object CMakeFiles/flash32w.dir/stm32f_usb.c.o

Known Issues

In some cases burning of STM32F firmware fails when tool request switch to bootloader mode, but in that case device will stay in bootloader mode so 2nd attempt will typically succeed.

Obtaining STM32F USB-to-Serial Firmware

STM32F USB-to-Serial firmware is closed source firmware provided together with stm32w_flasher tool, There are 3 versions available from different software packages:

Version 1.0.1 (8760 bytes) - This version in most cases works with CDC-ACM drivers on different OS
Version 2.0.4 (25168 bytes) - Implements USB composite devices, not recognized by default CDC-ACM driver in most cases
Version 2.0.6 (28276 bytes) - Implements USB composite devices, not recognized by default CDC-ACM driver in most cases

License

This code is published under BSD 2-Clause license.