STM32 IAP 官方应用笔记 AN4657
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April 2020 AN4657 Rev 2 1/16
1
AN4657
Application note
STM32 in-application programming (IAP) using the USART
Introduction
An important requirement for most Flash-memory-based systems is the ability to update
firmware when installed in the end product. This ability is referred to as in-application
programming (IAP).
Most newer STM32 microcontrollers are supported by middleware open source library
called Open Bootloader (OpenBL).
More information on OpenBL is available for example in USART protocol used in the STM32
bootloader (AN3155).
The purpose of this application note is to provide general guidelines for creating an IAP
application on older STM32 microcontrollers not supported by the OpenBL.
An STM32 microcontroller is able to run user-specific firmware to perform an IAP of the
Flash memory embedded in the microcontroller. This feature uses any communication
interface available and supported by the product. The USART using the Ymodem protocol is
the example taken in this application note.
The X-CUBE-IAP-USART firmware package is delivered with this document and contains
the source code of IAP examples for STM32 microcontrollers. It is available from
www.st.com.
www.st.com
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