Trouble initializing the I2C interface

[emmanuelkatto]

Hi everyone, My name is Emmanuel Katto. I am having trouble initializing the I2C interface on the STM32F4 series. Could someone provide a simple example or point me to resources that detail the setup process?

Looking forward to your responses.

Thanks in advance!

Best,

Emmanuel Katto

[Andrew Neil]

Welcome to the forum.

You posted this under STM8 - I've moved it to STM32 for you.

The best way to get started would be with an STM32F4 Nucleo board

https://www.st.com/en/evaluation-tools/stm32-nucleo-boards.html 

https://www.st.com/en/evaluation-tools/stm32-nucleo-boards/products.html?querycriteria=productId=LN1847$$1574=Nucleo-64&aggOrder=0%7C1%7C2%7C3%7C4%7C5%7C6%7C7%7C8%7C9%7C10%7C11%7C12%7C13%7C14%7C15%7C16%7C17%7C18%7C19%7C20%7C21 

If you're using STM32CubeIDE, start a project for one of the Nucleo boards;  there are examples which illustrate most of the STM32's features - including I2C.

https://www.st.com/en/development-tools/stm32cubeide.html

https://www.youtube.com/playlist?list=PLnMKNibPkDnGtuIl5v0CvC81Am7SKpj02

The HAL documentation is here:

https://www.st.com/resource/en/user_manual/um1725-description-of-stm32f4-hal-and-lowlayer-drivers-stmicroelectronics.pdf

[Andrew Neil]

Good video here on getting started with an STM32 Nucleo board:

https://www.youtube.com/watch?v=hyZS2p1tW-g

[TDK]

STM32CubeMX will provide the initialization code for you.

You can see an example usage of I2C here:

STM32CubeF4/Projects/STM32446E-Nucleo/Examples/I2C/I2C_TwoBoards_ComPolling/Src/main.c at e21c319e17a7f5aef332be677eaff2a0e7c316df · STMicroelectronics/STM32CubeF4 (github.com)

Note that I2C requires external pullups of around 2.2kOhm on the SDA and SCL lines.