Updating Firmware of STM32 CPU via USB Cable Using USB DFU Protocol

Application Overview

The application facilitates the updating of firmware on STM32 CPUs using a USB cable and the USB DFU protocol. It is developed based on the following documents from STMicroelectronics:

1. AN2606: STM32 Microcontroller System Memory Boot Mode
2. AN3156: USB DFU Protocol Used in the STM32 Bootloader

How to Use the Application

Prerequisite

• Your mobile device must support USB-OTG.

Preparation

1. Connect the STM32 board to your mobile device using a USB-OTG cable.
2. Activate bootloader mode for the STM32. Refer to AN2606 for detailed instructions. Generally, you need to set the BOOT0 and BOOT1 pins in the correct combination according to your CPU model.

Programming

1. Select the firmware file you wish to upload. The firmware file should be in one of the following formats:

   • Intel hex
   • Motorola S-Record
   • DfuSe (STMicroelectronics DFU format)
   • Raw binary

2. Set the necessary writing options. You can choose from the following:

   • Erase only necessary pages
   • Unset readout protection if needed
   • Start the CPU after programming

3. Press the "Load file to flash" button and wait for the operation to complete.

Additional Operations

The application also supports the following operations, accessible via the appropriate menu points:

• Erasing
• Checking flash for blank
• Comparing flash with file

Tested Models

The application has been successfully tested on the following STM32 microcontroller models:

• STM32F072
• STM32F205
• STM32F302
• STM32F401
• STM32F746
• STM32G474
• STM32L432

Restrictions on Usage

You can perform up to 25 firmware uploads for free. After reaching this limit, you have the option to purchase one of the following services:

1. An additional 100 uploads
2. Unlimited use of the application