void GPIO_EXTILineConfig(uint8_t GPIO_PortSource, uint8_t GPIO_PinSource);//Determine the mapping relationship between ports and interrupt lines
void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct);//Initialize interrupt line, trigger mode
typedef struct
{
uint32_t EXTI_Line;//Specify the interrupt line to be configured
EXTIMode_TypeDef EXTI_Mode;//Mode: event or interrupt
EXTITrigger_TypeDef EXTI_Trigger;//Trigger mode: rising edge/falling edge/double edge
FunctionalState EXTI_LineCmd; //Is it enabled?
}EXTI_InitTypeDef;
ITStatus EXTI_GetITStatus(uint32_t EXTI_Line);//Judge whether the interrupt line interrupt state occurs
void EXTI_ClearITPendingBit(uint32_t EXTI_Line);// Clear the interrupt flag on the interrupt line
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