How to enable GPIO interrupt on STM32F4DISCOVERY user button from STM32CubeMX

Question

I would like to enable a GPIO interrupt whenever a user presses the user button on the STM32F4DISCOVERY board.

Steps I am following:

1. Download and install STM32CubeMX 4.27.0
2. New Project
3. Board Selector
4. STM32F4DISCOVERY
5. Initialize all peripherals to their default Mode: Yes

Note that PA0 -> B1 [Blue Push Button].

My understanding is that PA0 should be mapped to EXTI0 interrupt.

6. Configuration | GPIO confirms that PA0 is set to External Event Mode with Rising edge trigger detection

7. Configuration | NVIC

But I don't see a way to enable EXTI0 interrupt:

Answer 1

Click on PA0 and select Reset_State, then select GPIO_EXTI0. After that, under GPIO configuration select "External Interrupt Mode ...".

Now EXTI line0 interrupt should be visible under NVIC configuration.