How to implement key interrupt of stm32f103

#include"stm32f10x.h"

void LED_GPIO_Config()

{

/*Define a GPIO_InitTypeDef type structure*/

GPIO_InitTypeDef GPIO_InitStructure;

/*Turn on the peripheral clock of GPIOB*/

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

/*Select the GPIOB pin to control*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;

/*Set pin mode to general push-pull output*/

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

/*Set the pin rate to 50MHz*/

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

/*Call library function to initialize GPIOB*/

GPIO_Init(GPIOB, &GPIO_InitStructure);

/*Turn off the LED light*/

GPIO_SetBits(GPIOB, GPIO_Pin_5);

}

void EXTI_PC5_Config()

{

static void NVIC_Configuration();

/*Define a GPIO_InitTypeDef type structure*/

GPIO_InitTypeDef GPIO_InitStructure;

/*Define a structure of type EXTI_InitTypeDef*/

EXTI_InitTypeDef EXTI_InitStructure;

/*Turn on GPIOC peripheral clock and AFIO clock*/

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);

/*Configure NVIC(PC5)*/

NVIC_Configuration();

/*EXTI GPIO(PC5) line configuration*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; /*Set pull-up input*/

GPIO_Init(GPIOC, &GPIO_InitStructure); /*Call library function to initialize GPIOC*/

/*EXTI line (PE5) mode configuration*/

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; /*Falling edge interrupt*/

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

}

static void NVIC_Configuration()

{

/*Define a structure of type NVIC_InitTypeDef*/

NVIC_InitTypeDef NVIC_InitStructure;

/*Configure one bit for preemption priority*/

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

/*Configure P[A|B|C|D|E]5 as interrupt source*/

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) /*Ensure whether EXTI Line interrupt has occurred*/

{

/*Debounce*/

Delay(1000);

/*LED inversion*/

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

/* Clear interrupt flag */

EXTI_ClearITPendingBit(EXTI_Line5);

}

}

int main(void)

{

/* Initialize LED */

LED_GPIO_Config();

/*EXTI line configuration*/

EXTI_PC5_Config();

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

while(1);

}