"EXTIX_IRQHandler" not found.

[MQi.1]

I tried this tutorial on NUCLEO-L412RB-P, it was said "The HAL_EXTIX_IRQHandler and EXTIX_IRQHandler are inside stm32l4xx_it.c file.", I haven't find "EXTIX_IRQHandler" there, is it in somewhere else, or it was needed for L412RB-P?(the tutorial based on NUCLEO-L476RG)

[Tesla DeLorean]

See the names in the Vector Table in startup_stm32l4xx.s

Name will not be X, but rather the pin or grouping ie

EXTI0_IRQHandler()

EXTI1_IRQHandler()

EXTI9_5_IRQHandler() // External Line[9:5]s

On U5 each EXTI has it's own handler, most STM32 do not

Put the body code for your function in stm32l4xx_it.c or main.c, there is typically only a weak placeholder in startup.s

[MQi.1]

I found the reason: the screenshot under"Check GPIO configuration", the item "GPIO Pull-up/Pull-down" should be selected as "Pull-up" for the former item "GPIO mode" selected as "...Falling edge...".

[Tesla DeLorean]

Sounds like the answer to an entirely different question..

[MQi.1]

I'm sorry, I haven't expressed clearly. I want to find the solution, so firstly guessed it maybe lack of "EXTIX_IRQHandler", I found it later, and that was not the reason, then I found the solution. Thanks for your suggestion instantly.