STMicroelectronics AN3310 Application Note: Updating Firmware in STM32L1xx Microcontrollers via USART IAP

This document provides guidelines for updating firmware in STM32L1xx microcontrollers through in-application programming using the USART.

Brand: STMicroelectronics
Category: microcontrollers
Document type: Application Note
Language: English
Pages: 19
File format: PDF
File size: 351 KB
Published: 06 August, 2012
Updated: 29 September, 2023
Models: STM32L1xx, STM32L1
MD5 checksum: 85B4B34ABFB46C44BD0CC458EC3DEBF0
PDF: STMicroelectronics AN3310 Application Note: Updating Firmware in STM32L1xx Microcontrollers via USART IAP PDF

About this manual

The document describes how to implement In-Application Programming (IAP) on STM32L1xx microcontrollers, specifically targeting ultra-low power medium-density, medium-density plus, and high-density devices. It details the use of an IAP driver programmed into Flash memory via JTAG/SWD to facilitate firmware updates.

What's inside

IAP Overview
Running the IAP Driver
HyperTerminal Configuration
Downloading an Image
Uploading an Image
Executing the New Program
Memory Write Protection
Dual Bank Feature

Specifications

Supported Microcontroller Series	STM32L1xx (medium-density, medium-density plus, high-density)
Baud Rate Example	115200 bps

Frequently asked questions

How is the IAP driver programmed into memory?

The IAP driver should be programmed to the Flash memory base address via the JTAG/SWD interface using a development toolchain or factory-embedded bootloader.

How does the user switch to IAP mode?

The user can press a push-button connected to a specific pin at reset; not pressing it switches to the user application.

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