STM32 library functions EXTI_GetFlagStatus and EXTI

Collect

One is for getting status and the other is for getting interrupts.

EXTI_GetFlagStatus simply reads the status of the interrupt flag, but does not necessarily respond to the interrupt (the EXT_IMR register masks the interrupt); while EXTI_GetITStatus, in addition to reading the interrupt flag, also checks whether the EXT_IMR register masks the interrupt. If the interrupt is pending & not masked, the interrupt will be responded to. Take a closer look at the code and you will know the difference.
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;
}

Keywords：STM32 Reference address：STM32 library functions EXTI_GetFlagStatus and EXTI_GetIT

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