如何用STM32配置一个EXTIx中断线的I/O口-//NVIC_CONFIG（）;

//2.配置EXTIx线的中断优先级

NVIC_PriorityGroupConfig（NVIC_PriorityGroup_1）;

NVIC_InitStructure.NVIC_IRQChannel=EXTI3_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init（&NVIC_InitStructure）;