EXTI in STM32MP257F in cubeMX and configuring NVIC.

[Amit_RS]

Dear all, 
I was trying to setup the NVIC for EXTI for certain pins on STM32MP257F over CubeMX. However the nomenclature in CubeMX confuses me a lot. As I know there are two EXTIs: EXTI1 and EXTI2 which completely changes when we look into NVIC there it shows EXTI and EXTI1. Now the confusion is if EXTI is EXTI1 or 2 and so on.

Thanking you all.

with regards

Amit

 

 

[PatrickF]

Hi @Amit_RS 

Agree CubeMx is not clear enough.

Looking at RM0547 Section "31 Interrupt list" will help you.

 

Regards.

[Amit_RS]

Hi @PatrickF ,

I looked through the reference manual, however it doesn't mention why assigning GPIOs to EXTI open up two EXTI instances i.e EXTI and EXTI1. Also I couldn't find information on what is the difference between them. If you see my first image there you can clearly see EXTI line 7 interrupt and EXTI1 line 7 interrupt. So it completely confuses me as RM never mentions it.

 

regards
Amit

[PatrickF]

Agreed, it is confusing. I could guess 'EXTI' is EXTI2.
I confirm you could assign a GPIO to either EXTI1 or EXTI2 (or both, but useless).
Maybe looking at generated code could help to clarify.