STMicroelectronics AN1633 DFU Implementation in Non-USB Applications

About this manual

This document describes the implementation of the Device Firmware Upgrade (DFU) capability using ST7 USB microcontrollers, such as the ST72F62 or ST72F63B, in general-purpose or 'non-USB' applications. In this setup, the USB interface is not used for the main application but serves as a maintenance utility port to upgrade the MCU firmware when a USB cable is plugged in. The application board is self-powered, and the USB cell is only activated during the upgrade process.

What's inside

• Introduction
• DFU Mechanism
• USB Cable Detection
• Transition Between USB and Application
• RAM Management
• Firmware Example
• Graphical User Interface
• Related Documents
• Terms and Abbreviations

Frequently asked questions

Which ST7 microcontrollers are covered in this application note?

The note describes implementation using ST7 USB microcontrollers like the ST72F62 or ST72F63B.

When is the USB cell activated in a non-USB application?

The USB cell is only activated when the USB cable is plugged-in to enter the DFU process.

What compilers are compatible with the example firmware?

The example firmware is compatible with Cosmic and Metrowerks compilers.