void exti_init() //外部中断初始化
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* 开启GPIO时钟 */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE,ENABLE);
GPIO_InitStructure.GPIO_Pin= K_RIGHT; //K_LEFT|K_DOWN|K_RIGHT
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU; //上拉
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOE,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin= K_UP; //K_UP
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPD; //下拉
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
/* 设置外部中断的模式 */
/* EXTI_Line1映射至A拐角*/
EXTI_InitStructure.EXTI_Line=EXTI_Line0;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;//EXTI_Trigger_Rising
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* 设置外部中断的模式 */
/* EXTI_Line2映射至E拐角,键:key1 led灯:led_left下降沿*/
EXTI_InitStructure.EXTI_Line=EXTI_Line2;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* 设置外部中断的模式 */
/* EXTI_Line3映射至E拐角,键:key2 led灯:led_down下降沿*/
EXTI_InitStructure.EXTI_Line=EXTI_Line3;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* 设置外部中断的模式 */
/* EXTI_Line4映射至E拐角,键:key3 led灯:led_right下降沿*/
EXTI_InitStructure.EXTI_Line=EXTI_Line4;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
//选择GPIO管脚用作外部中断线路,k1/k2/k3在E拐角
//E拐角对应多条线路的映射,
//选择GPIO管脚用作外部中断线路,key_up 在A拐角
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
//此处一定要记住给端口管脚加上中断外部线路
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource2);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource3);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource4);
/* 设置NVIC参数 key0 key_up*/
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn; //打开EXTI1的全局中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级为0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级为0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能
NVIC_Init(&NVIC_InitStructure);
/* 设置NVIC参数 key_left*/
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn; //打开EXTI2的全局中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级为0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级为0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能
NVIC_Init(&NVIC_InitStructure);
/* 设置NVIC参数 key_right*/
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn; //打开EXTI2的全局中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级为0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级为0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能
NVIC_Init(&NVIC_InitStructure);
/* 设置NVIC参数 key_down*/
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn; //打开EXTI2的全局中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级为0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级为0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能
NVIC_Init(&NVIC_InitStructure);