a problem about interrupt enable after the interrupt happened

[Yang Yang]

Hello, ST expert

E.g. GPIO PD4 functions as falling edge interrupt pin on STM32F407. Before the falling edge this interrupt is disabled by HAL_NVIC_DisableIRQ(EXTI4_IRQn).  What happened if HAL_NVIC_EnableIRQ(EXTI4_IRQn) is executed after the falling edge? The interrupt will be ignored or be captured immediately after HAL_NVIC_EnableIRQ?

Best Regards

Yang

[Pavel A. · Accepted solution]

After HAL_NVIC_EnableIRQ the interrupt handler will be called immediately.