2026-06-11
STM32 EXTI at Register Level:SYSCFG, GPIO Interrupt Mapping, and NVIC Wiring
Configure STM32 EXTI external interrupts without HAL: SYSCFG_EXTICR GPIO mapping, EXTI rising/falling edge triggers, interrupt mask, pending flag clearing, and NVIC integration. Register-level walkthrough on STM32F4 with a practical push-button example.
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