【STM32 Cotex-M3處理器系列編程】外部按鍵中斷

#include "stm32f10x.h"

unsigned int TimingDelay;

void Delay(unsigned int x)

{

TimingDelay=x;

while(TimingDelay--);

}

void EXTI9_5_IRQHandler(void) //中斷處理函數

{

unsigned int tt;

tt=6553500;

if(EXTI_GetITStatus(EXTI_Line5)!=RESET)

{

GPIO_SetBits(GPIOC, GPIO_Pin_7);

while(tt--);

GPIO_ResetBits(GPIOC, GPIO_Pin_7);

while(tt--);

EXTI_ClearFlag(EXTI_Line5);//清除中斷標志

EXTI_ClearITPendingBit(EXTI_Line5);//清除EXTI線路掛起位

}

}

int main(void)

{

//配置IO口

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE,ENABLE);//IO口使能設置

GPIO_InitTypeDef GPIO_InitStructure; //定義結構體

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //設置為上拉輸入

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOE, &GPIO_InitStructure);

//配置外部中斷控制器

EXTI_InitTypeDef EXTI_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);//使能時鐘

EXTI_InitStructure.EXTI_Line = EXTI_Line5; //使用IO口5作為中斷口

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //設置EXTI線路為中斷請求

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿觸發(fā)

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource5);//將PE5掛接到EXTI9_5_IRQn中斷源上

//配置中斷控制器

NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //選擇中斷組0

NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; //指定中斷源，0-4管腳屬于EXTI0_IRQn~EXTI4_IRQn,5-9管腳屬于EXTI9_5_IRQn，10-15管腳屬于EXTI15_10_IRQn

//NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;//無先占優(yōu)先級，從優(yōu)先級為1

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

while(1);

}

//以下是報錯函數

#ifdef USE_FULL_ASSERT

void assert_failed(uint8_t* file, uint32_t line)

{

while (1)

{

}

}

#endif