環(huán)境：

主機:WIN7

開發(fā)環(huán)境:MDK4.23

MCU:STM32F103CBT6

說明:

STM32有20個外部中斷線,其中EXTI0-EXTI15給I/O端口使用

EXTI線16連接到PVD輸出
EXTI線17連接到RTC鬧鐘事件
EXTI線18連接到USB喚醒事件
EXTI線19連接到以太網(wǎng)喚醒事件(只適用于互聯(lián)型產(chǎn)品)

源代碼:

初始化:

//打開NTRX外部中斷

voidopen_ntrx_irq(void)

{

//定義中斷結(jié)構(gòu)體

NVIC_InitTypeDefNVIC_InitStructure;

//定義外部中斷結(jié)構(gòu)體

EXTI_InitTypeDefEXTI_InitStructure;

//定義IO初始化結(jié)構(gòu)體

GPIO_InitTypeDefGPIO_InitStructure;

//初始化NTRX中斷腳PB1時鐘

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO,ENABLE);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;//設置為輸入

GPIO_Init(GPIOB,&GPIO_InitStructure);//GPIOB初始化

//配置中斷源為PB1

GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1);

//配置EXTI_Line1下降沿觸發(fā)

EXTI_ClearITPendingBit(EXTI_Line1);

EXTI_InitStructure.EXTI_Line=EXTI_Line1;

EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;

EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_LineCmd=ENABLE;

EXTI_Init(&EXTI_InitStructure);

//打開NTRX中斷

NVIC_InitStructure.NVIC_IRQChannel=EXTI1_IRQn;//通道設置為外部中斷線0

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x0f;//中斷占先等級0

NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x0f;//中斷響應優(yōu)先級0

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;//打開中斷

NVIC_Init(&NVIC_InitStructure);//初始化

//EXTI_Line1軟件中斷允許

//EXTI_GenerateSWInterrupt(EXTI_Line1);

}

中斷函數(shù):

//NTRX中斷

voidEXTI1_IRQHandler(void)

{

if(EXTI_GetITStatus(EXTI_Line1)!=RESET)

{

//清中斷

EXTI_ClearITPendingBit(EXTI_Line1);

//中斷標志置位

Flag_IRQ.ntrx=1;

}

}