SMBus-two-wire-Interface unavailable for STM32G474RCT3

redmore · ‎2026-01-06

Howdy!

I'm encountering a peculiar issue using STM32CubeMX ( version 16.6.1 ) and configuring the I2C1 peripheral with firmware version STM32Cube FW_G4 V1.6.1.

In short, I'm trying to configure it for SMBus-two-wire-Interface, but this option fails to appear in the drop-down, only making SMBus-Alert-Mode available. This is a problem since the alert pin is already being utilized for a different purpose.

This appears to be true for all the I2Cx on this device, and in desperation, I checked a handful of other STMG4x microcontrollers, and this issue remains present throughout. Additionally, I randomly checked STM32H7x, and it appears these did NOT share this issue, with the SMBus-two-wire-Interface option appearing as expected.

We have a client with a tight deadline, and using SMBUS is essential. Any updates on when this could be fixed, or workarounds would be greatly appreciated.

Thanks a million in advance!

Ghofrane GSOURI · ‎2026-01-06

Hello @redmore

Thank you for reporting.

This issue has been already detected and escalated to dev team in the following Ticket 224666 and it will be fixed as soon as possible.

THX

Ghofrane

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