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34 lines
1.4 KiB
34 lines
1.4 KiB
#include "exti.h"
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/*******************************************************************
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*函数名称：void EXTI_GPIO_Config(void)
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*函数功能：配置外部中断时钟和IO口及中断优先级
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*输入：无
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*输出：无
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*备注：在用到外部中断时记得打开复用时钟
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*******************************************************************/
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void EXTI_GPIO_Config(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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EXTI_InitTypeDef EXTI_InitStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);//使能管脚复用功能
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/*配置IO口*/
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;//
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GPIO_Init(GPIOA, &GPIO_InitStructure);//
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GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource4);//使能PA0用作外部中断线路
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/*配置中断模式*/
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EXTI_InitStructure.EXTI_Line = EXTI_Line4;//配置中断线
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EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//中断模式
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EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//下降沿触发
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EXTI_InitStructure.EXTI_LineCmd = ENABLE;//使能中断线
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EXTI_Init(&EXTI_InitStructure);//
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/*配置中断优先级*/
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//中断管理模式
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NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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}
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