stm32f103按键中断实现方法

#include"stm32f10x.h"

void LED_GPIO_Config()

{

/*定义一个GPIO_InitTypeDef类型的结构体*/

GPIO_InitTypeDef GPIO_InitStructure;

/*开启GPIOB的外设时钟*/

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

/*选择要控制的GPIOB引脚*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;

/*设置引脚模式为通用推挽输出*/

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

/*设置引脚速率为50MHz*/

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

/*调用库函数，初始化GPIOB*/

GPIO_Init(GPIOB, &GPIO_InitStructure);

/*关闭LED灯*/

GPIO_SetBits(GPIOB, GPIO_Pin_5);

}

void EXTI_PC5_Config()

{

static void NVIC_Configuration();

/*定义一个GPIO_InitTypeDef类型的结构体*/

GPIO_InitTypeDef GPIO_InitStructure;

/*定义一个EXTI_InitTypeDef类型的结构体*/

EXTI_InitTypeDef EXTI_InitStructure;

/*开启GPIOC的外设时钟和AFIO时钟*/

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);

/*配置NVIC(PC5)*/

NVIC_Configuration();

/*EXTI GPIO(PC5)线配置*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; /*设置上拉输入*/

GPIO_Init(GPIOC, &GPIO_InitStructure); /*调用库函数，初始化GPIOC*/

/*EXTI线(PE5)模式配置*/

GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource5);

EXTI_InitStructure.EXTI_Line = EXTI_Line5;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; /*下降沿中断*/

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

}

static void NVIC_Configuration()

{

/*定义一个NVIC_InitTypeDef类型的结构体*/

NVIC_InitTypeDef NVIC_InitStructure;

/*为抢占优先级配置一位*/

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

/*配置P[A|B|C|D|E]5为中断源*/

NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

void Delay(uint32_t uCount)

{

    for(;uCount>0;uCount--);

}

void EXTI9_5_IRQHandler()

{

if(EXTI_GetITStatus(EXTI_Line5) != RESET) /*确保是否产生了EXTI Line中断*/

{

/*消抖*/

Delay(1000);

/*LED取反*/

GPIO_WriteBit(GPIOB, GPIO_Pin_5, (BitAction)((~GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_5))));

/*清除中断标志位*/

EXTI_ClearITPendingBit(EXTI_Line5);

}

}

int main(void)

{

/*初始化LED*/

LED_GPIO_Config();

/*EXTI线配置*/

EXTI_PC5_Config();

GPIO_SetBits(GPIOB, GPIO_Pin_5);/*置高*/

while(1);

}