STM32库函数EXTI_GetFlagStatus和EXTI_GetIT

EXTI_GetFlagStatus只是纯粹读取中断标志位的状态，但是不一定会响应中断（EXT_IMR寄存器对该中断进行屏蔽）；而EXTI_GetITStatus除了读取中断标志位，还查看EXT_IMR寄存器是否对该中断进行屏蔽，在中断挂起&没有屏蔽的情况下就会响应中断。仔细看看代码就知道区别了
FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
{
FlagStatus bitstatus = RESET;

assert_param(IS_GET_EXTI_LINE(EXTI_Line));

if ((EXTI->PR & EXTI_Line) != (uint32_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}

ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
{
ITStatus bitstatus = RESET;
uint32_t enablestatus = 0;

assert_param(IS_GET_EXTI_LINE(EXTI_Line));

enablestatus = EXTI->IMR & EXTI_Line;
if (((EXTI->PR & EXTI_Line) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET))
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}