主函数里
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置中断优先级分组
库函数里对中断初始化
void EXTIX_Init(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
KEY_Init(); //按键初始化
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//中断时钟初始化
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);//A0连接到中断线0
EXTI_InitStructure.EXTI_Line = EXTI_Line0;//LINE0
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//中断事件
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //上升沿触发
EXTI_InitStructure.EXTI_LineCmd = ENABLE;//使能
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;//抢占优先级0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//子优先级2
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能 NVIC_Init(&NVIC_InitStructure);
写中断服务函数,比如
void EXTI0_IRQHandler(void)
{
delay_ms(10);
if(WK_UP==1)
{
BEEP=!BEEP; //反转
}
EXTI_ClearITPendingBit(EXTI_Line0); /清空中断标志位
}