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Regarding STM32L startup file "startup_stm32l1xx_hd.s" there is only 5 functions EXTI0_IRQHandler EXTI1_IRQHandler EXTI2_IRQHandler EXTI3_IRQHandler EXTI4_IRQHandler respectively for EXTI_Line0 to EXTI_Line4 how can I handle the EXTI_Line5 or EXTI_Line6, and so on?
5 thru 9 route to a single IRQ - EXTI9_5_IRQHandler You then differentiate the exact source there.
The ADC Sequencer Example is using the User Button and is differentiating the interrupt.
A different example is the IWDG test on the STM32F103 Nucleo board.
I pretty sure any test that expects the Blue User button on the Nucleo Board to be pressed would be using the IRQ and differentiating the IRQ.
The Nucleo User Button is PC13, would be serviced by EXTI15_10_IRQHandler