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EXTI0 function

I have the MCBSTM32F400 board or stm32f4 discovery board.
I'm trying to investigate how to make a basic interrupt driven button.

I have got this to work using the stm32 libraries before but are there any hints on how to get
it to work using the "EXTI0 line ticked in RTE device"?

Theoretically once I press the button, it should interrupt and go to EXTI0_IRQHandler(void) but
it doesn't.

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