F410RB confusing pin-name I2C1 vs I2C4 between datasheet and the STM32CubeIDE

Copeland · ‎2022-10-10

If I look at the STM32F410RB datasheet on page , I can see the following pin name:

PB13 - I2C4_SMBA

PB14 - I2C4_SDA (FM+) used for Fm+ mode (1MHz)

PB15 - I2C4_SCL (FM+) used for Fm+ mode (1MHz)

So far, so good, but when I try to configure these pins in the STM32CubeIDE, I can only see they are named:

PB13 - FMI2C1_SMBA

PB14 - FMI2C1_SDA used for Fm+ mode (1MHz)

PB15 - FMI2C1_SCL used for Fm+ mode (1MHz)

In the datasheet, I2C1 and I2C2 have speeds up to 400kHz, whereas I2C4 is the 1MHz (Fm+) bus which I want to use in my application.

When I generate the code STM32CubeIDE, it also generates pin names with I2C1 in it.

Can I still use these pins, or are the pin names in the STM32CubeIDE a bug, that I will have to correct manually?

waclawek.jan · ‎2022-10-10

This thing is a mess:

FMPI2C1 is mentioned also in RM0401
respective pins in the pin table in DS are not marked to be FM+ capable
IO port characteristics chapter in DS does not mention FM+ pins

JW

KDJEM.1 · ‎2022-11-30

Hell @Copeland & @Community member,

I confirm the issue and I reported internally.

Internal ticket number: 140213 (This is an internal tracking number and is not accessible or usable by customers).

Kaouthar

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waclawek.jan · ‎2022-12-01

Thanks, Kaouthar.

Jan