UM1766 datasheet(22/29 Pages) STMICROELECTRONICS

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UM1766

Getting started with STM32CubeF3

4.2.2

LL application

This section describes the steps needed to create your own LL application using

STM32CubeF3.

Create your project

To create a new project you can either start from the Templates_LL project provided for

each board under \Projects\<STM32xxx_yyy>\Templates_LL or from any available

project under \Projects\<STM32xxy_yyy>\Examples_LL (<STM32xxx_yyy> refers to

the board name, such as NUCLEO-F334R8).

The Template project provides an empty main loop function, however it is a good

starting point to get familiar with project settings for STM32CubeF3.

Template main characteristics are the following:

–

It contains the source codes of the LL and CMSIS drivers which are the minimal

components needed to develop code on a given board.

–

It contains the include paths for all the required firmware components.

–

It selects the supported STM32F3 device and allows to configure the CMSIS and

LL drivers accordingly.

–

It provides ready-to-use user files, that are pre-configured as follows:

main.h : LED & USER_BUTTON definition abstraction layer.

main.c : System clock configuration for maximum frequency.

Port an existing project to another board

To port an existing project to another target board, start from the Templates_LL project

provided for each board and available under

\Projects\<STM32xxx_yyy>\Templates_LL:

Select a LL example

To find the board on which LL examples are deployed, refer to the list of LL

examples STM32CubeProjectsList.html, to Table 3: Number of examples

available for each board or to application note “STM32Cube firmware examples

for STM32F3 Series” (AN4734)

Port the LL example

–

Copy/paste the Templates_LL folder - to keep the initial source - or directly update

existing Templates_LL project.

–

Then porting consists principally in replacing Templates_LL files by the

Examples_LL targeted project.

–

Keep all board specific parts. For reasons of clarity, board specific parts have been

flagged with specific tags:

/* ==============

BOARD SPECIFIC CONFIGURATION CODE BEGIN

============== */

/* ==============

BOARD SPECIFIC CONFIGURATION CODE END

============== */

Thus the main porting steps are the following:

–

Replace the stm32F3xx_it.h file

–

Replace the stm32F3xx_it.c file

–

Replace the main.h file and update it: Keep the LED and user button definition of

the LL template under "BOARD SPECIFIC CONFIGURATION" tags.

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