STM32学习之EXTI(外部中断篇) -

标题: STM32学习之EXTI(外部中断篇) [打印本页]

作者: xiaos 时间: 2015-4-10 17:37
标题: STM32学习之EXTI(外部中断篇)
使用EXTI要先设置NVIC;

void NVIC_Configuration()

{

NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);//选择中断优先级分组

NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;//设置0管脚为中断管脚

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//设置先占式优先级

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;//设置从占式优先级

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能

NVIC_Init(&NVIC_InitStructure);

}

接着设置EXTI 这里我选择使用EXTI0

void EXTI_Configuration()

{

EXTI_InitTypeDef EXTI_InitStructure;

EXTI_DeInit(); //将EXTI 设置为默认值

GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0); //选择A0为中断管脚

EXTI_InitStructure.EXTI_Line = EXTI_Line0; //选择0通道

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //选择为中断

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //设置沿下降沿中断

EXTI_InitStructure.EXTI_LineCmd = ENABLE; //使能

EXTI_Init(&EXTI_InitStructure);

}

注意完成一次中断后要把中断标准位清空使用EXTI_ClearITPendingBit(EXTI_Line0);

而且还要把复用时钟打开使用

RCC_APB2PeriohClockCmd(RCC_APB2Periph_AFIO,ENABLE);

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