|
- /***********************头文件****************************/
- #include "exti.h"
-
- /**********************************************
- //外部中断初始化程序
-
- ***********************************************/
- void EXTIX_Init(void)
- {
- NVIC_InitTypeDef NVIC_InitStructure;
- EXTI_InitTypeDef EXTI_InitStructure;
-
- /***************使能SYSCFG时钟***************/
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能SYSCFG时钟
-
- /***************初始化IO口*******************
- PI4 -> I14 外部中断输入
- PI5 -> I15 外部输入1
- PI6 -> I16 外部输入2
- **********************************************/
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOI, ENABLE);//使能GPIOB时钟
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;//PI4 = I14
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//普通输入模式
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
- GPIO_Init(GPIOI, &GPIO_InitStructure);//初始化GPIO
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//普通输入模式
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//输入上拉
- GPIO_Init(GPIOI, &GPIO_InitStructure);//初始化GPIO
-
- /***************设置IO口与中断线的映射关系***************/
- SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOI, EXTI_PinSource4);//PI4 连接到中断线4
-
- /***************初始化线上中断，设置触发条件***************/
- EXTI_InitStructure.EXTI_Line = EXTI_Line4; //选择线上中断
- EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //中断事件
- EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿触发
- EXTI_InitStructure.EXTI_LineCmd = ENABLE;//中断线使能
- EXTI_Init(&EXTI_InitStructure);//配置
-
- /***************中断使能***************/
- NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;//外部中断4
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;//抢占优先级1
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//子优先级2
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道
- NVIC_Init(&NVIC_InitStructure);//配置
-
- }
-
-
-
-
-
-
-
-
-
-
-
|
