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sarun
Associate III
November 29, 2024
Solved

Confirmation on EXTI limitiation

I want to confirm the limitations of GPIO interrupts on STM32 devices.

I am using an STM32H7 device, and observed that interrupts cannot be configured for PA0 and PB0 at the same time.  I could not find any confirmation regarding this in the device datasheet,can anyone give me the confirmation on this.

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mƎALLEm
mƎALLEmBest answer
ST Technical Moderator
November 29, 2024

Hello @sarun ,

If you refer to the reference manual / SYSCFG_EXTICR[n] register, you find that only one IO on x position could be configured as EXTI input at a time:

SofLit_0-1732872386323.png

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3 replies

STTwo-32
STTwo-32
ST Technical Moderator
November 29, 2024

Hello @sarun 

PA0 and PB0 and so on, are connected to Line0, so you can use only one pin at one time to handle interrupt from there.

Best Regards.

STTwo-32 

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    mƎALLEm
    mƎALLEmBest answer
    ST Technical Moderator
    November 29, 2024

    Hello @sarun ,

    If you refer to the reference manual / SYSCFG_EXTICR[n] register, you find that only one IO on x position could be configured as EXTI input at a time:

    SofLit_0-1732872386323.png

    To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.
      sarunAuthor
      Associate III
      November 29, 2024

      Thank you for the support  @mƎALLEm  @STTwo-32 

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