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Firmware migration using the library

AN3422

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Doc ID 018976 Rev 2

Firmware migration using the library

This section describes how to migrate an application based on STM32F1xx Standard

Peripherals Library in order to use the STM32L1xx Standard Peripherals Library.

The STM32F1xx and STM32L1xx libraries have the same architecture and are CMSIS

compliant, they use the same driver naming and the same APIs for all compatible

peripheral.

Only a few peripheral drivers need to be updated to migrate the application from an F1

series to an L1 series product.

Note:

In the rest of this chapter (unless otherwise specified), the term “STM32L1xx Library” is

used to refer to the STM32L1xx Standard Peripherals Library and the term of “STM32F10x

Library” is used to refer to the STM32F10x Standard Peripherals Library.

5.1

Migration steps

To update your application code to run on STM32L1xx Library, you have to follow the steps

listed below:

Update the toolchain startup files

Project files: device connections and Flash memory loader. These files are

provided with the latest version of your toolchain that supports STM32L1xxx

devices. For more information please refer to your toolchain documentation.

Linker configuration and vector table location files: these files are developed

following the CMSIS standard and are included in the STM32L1xx Library install

package under the following directory: Libraries\CMSIS\Device\ST\STM32L1xx.

Add STM32L1xx Library source files to the application sources

Replace the stm32f10x_conf.h file of your application with stm32l1xx_conf.h

provided in STM32L1xx Library.

Replace the existing stm32f10x_it.c/stm32f10x_it.h files in your application with

stm32l1xx_it.c/stm32l1xx_it.h provided in STM32L1xx Library.

Update the part of your application code that uses the RCC, PWR, GPIO, FLASH, ADC

and RTC drivers. Further details are provided in the next section.

Note:

The STM32L1xx Library comes with a rich set of examples (87 in total) demonstrating how

to use the different peripherals (under Project\STM32L1xx_StdPeriph_Examples\).

5.2

RCC

System clock configuration: as presented in section 4.4: RCC the STM32L1 and F1

series have the same clock sources and configuration procedures. However, there are

some differences related to the product voltage range, PLL configuration, maximum

frequency and Flash wait state configuration. Thanks to the CMSIS layer, these

differences are hidden from the application code; you only have to replace the

system_stm32f10x.c file by system_stm32l1xx.c file. This file provides an

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