使用EXTI要先設置NVIC;
void NVIC_Configuration() { NVIC_InitTypeDef NVIC_InitStructure; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);//選擇中斷優先級分組 NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;//設置0管腳為 中斷管腳 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//設置先占式優先級 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;//設置從占式優先級 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能 NVIC_Init(&NVIC_InitStructure); } 接著設置EXTI 這里我選擇使用EXTI0 void EXTI_Configuration() { EXTI_InitTypeDef EXTI_InitStructure; EXTI_DeInit(); //將EXTI 設置為默認值 GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0); //選擇A0為中斷管腳 EXTI_InitStructure.EXTI_Line = EXTI_Line0; //選擇0通道 EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //選擇為中斷 EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //設置沿下降沿中斷 EXTI_InitStructure.EXTI_LineCmd = ENABLE; //使能 EXTI_Init(&EXTI_InitStructure); } 注意完成一次中斷后要把中斷標準位 清空 使用EXTI_ClearITPendingBit(EXTI_Line0); 而且還要把 復用時鐘打開 使用 RCC_APB2PeriohClockCmd(RCC_APB2Periph_AFIO,ENABLE);
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