stm32F407的EXTI外部中断

/*************************************************
Function: void NVIC_Config(void)
Description: 嵌套中断断配置函数
Input: 无
Output: 无
*************************************************/
void NVIC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //嵌套分组为组0
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn; //中断通道为通道0
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢断优先级为0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级为0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //开中断
NVIC_Init(&NVIC_InitStructure);
}

/*************************************************
Function: void Delay(__IO uint32_t nTime)
Description: 精确延时函数，时基根据前面设定，当前
为1ms
Input: 需要延时的时间，单位ms
Output:无
*************************************************/
void Delay(__IO uint32_t nTime)
{
TimingDelay = nTime;

while (TimingDelay != 0);
}

/*************************************************
Function: void TimingDelay_Decrement(void)
Description: SysTick中断服务函数，加在_it.h中的
void SysTick_Handler(void)函数内
Input: 无
Output:无
*************************************************/
void TimingDelay_Decrement(void)
{
if (TimingDelay != 0x00)
{
TimingDelay--;
}
}