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STM32CubeMx doesn't allow to use OSC_OUT as GPIO when HSE is in Bypass mode

BPart.1
Associate II

‎2025-11-18 2:17 AM - last edited on ‎2025-11-20 3:06 AM by

Split from this thread.

Hi mƎALLEm, Thanks for this reply and confirming that the OSC_OUT can be used as GPIO when HSE in bypass mode. Can  you please advise I do I set this as a GPIO? CubeMX does not allow me to configure this pin. Should this be hand coded to make this possible? Thanks. Regards Billy

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mƎALLEm
ST Employee

‎2025-11-18 2:26 AM - edited ‎2025-12-01 12:28 AM

@BPart.1 wrote:

CubeMX does not allow me to configure this pin. Should this be hand coded to make this possible? Thanks. Regards Billy

Hello @BPart.1 ,

Better to ask that question in CubeMx forum board and link to that thread and close that one by accepting my answer above..

Internal ticket opened for CubeMx follow-up: 222721 

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.
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Andrew Neil
Super User

‎2026-05-13 9:20 AM

@BPart.1 wrote:

CubeMX does not allow me to configure this pin. Should this be hand coded to make this possible? 

Indeed, it seems that this is a limitation of CubeMX - see: 

https://community.st.com/t5/stm32cubemx-mcus/how-to-set-hi-z-mode-in-ph1-osc-out-when-using-hse-bypass-mode/m-p/860116/highlight/true#M34335

 

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
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