STM32 中断实现的程序步骤

本程序实现的功能：将GPIO.13端口设置成下降沿触发中断，当中断事件发生后，与GPIOD.8相连的LED变亮。
步骤：
① 配置要使用到的端口的时钟，输入输出以及端口的第二功能（这里的第二功能是指把端口配置成EXTI口）
void GPIO_Configuration(void)

{
/* Configure PC13 as input floating (EXTI Line13) */

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 ;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_Init(GPIOD, &GPIO_InitStructure);
}

②初始化EXTI_InitStructure结构体的各种需要的配置
/* Connect EXTI Line13 to PC.13 */

GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource13);
/* Configure EXTI Line13 to generate an interrupt on falling edge */

EXTI_InitStructure.EXTI_Line = EXTI_Line13;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);
/* Generate software interrupt: simulate a falling edge applied on EXTI line 13 */

// EXTI_GenerateSWInterrupt(EXTI_Line13); //若使用此句，则不用手动触发中断事件，软件自动触发，继而直接转入中断处理函数。

③设置抢占式优先级和响应式优先级
void NVIC_Configuration(void)

{

NVIC_InitTypeDef NVIC_InitStructure;

#ifdef VECT_TAB_RAM

/* Set the Vector Table base location at 0x20000000 */

NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);

#else /* VECT_TAB_FLASH */

/* Set the Vector Table base location at 0x08000000 */

NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);

#endif
/* Configure one bit for preemption priority */

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

/* Enable the EXTI15_10 Interrupt */

NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQChannel;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

④ 在stm32f10x_it.c的EXTI15_10_IRQHandler中断函数里，完成中断处理程序。
void EXTI15_10_IRQHandler(void)

{

if(EXTI_GetITStatus(EXTI_Line13)!=RESET)

{

EXTI_ClearITPendingBit(EXTI_Line13); //别忘记清除中断标志位哦！！！！

GPIO_SetBits(GPIOD, GPIO_Pin_8 );

GPIO_ResetBits(GPIOD, GPIO_Pin_9);

}
}