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首先要了解一点，外部中断5-9的中断优先级设置是没办法单独给外部中断5或者外部中断7设置，这几个是统一设置，也就是说，当有外部中断5-9其中的一个引起触发时，就会进入中断函数EXTI9_5_IRQHandler()，进入该函数之后再判断到底是哪个触发，然后再做相应的处理。其中PB5触发方式为上升沿触发，PE7为下降沿触发，PE9为电平变化触发，就是有上升沿或者下降沿都会触发。
//1*初始化外中断使用的端口引脚
void GPIOX_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOE,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOE, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOE, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin= GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed =GPIO_Speed_50MHz;
GPIO_Init(GPIOE, &GPIO_InitStructure);
}
void EXTIX_Init(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
//2*重映射
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource5);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource7);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource9);
//3*EXTI的初始化
EXTI_InitStructure.EXTI_Line =EXTI_Line5;//EXTI_Line5
EXTI_InitStructure.EXTI_Mode =EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;//根据具体引脚
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
EXTI_InitStructure.EXTI_Line =EXTI_Line7;//EXTI_Line7
EXTI_InitStructure.EXTI_Mode =EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //根据具体引脚
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
EXTI_InitStructure.EXTI_Line =EXTI_Line9;//EXTI_Line9
EXTI_InitStructure.EXTI_Mode =EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger =EXTI_Trigger_Rising_Falling;//触发设置为上升下降沿触发
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
//4*中断优先级的配置
NVIC_InitStructure.NVIC_IRQChannel =EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority= 1;
NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//5*中断服务函数
voidEXTI9_5_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line5)!=RESET) //判断发现是外部中断线5触发
{
//中断处理内容，自行添加
EXTI_ClearITPendingBit(EXTI_Line5);
}
if(EXTI_GetITStatus(EXTI_Line7)!=RESET) //判断发现是外部中断线7触发
{
//中断处理内容，自行添加
EXTI_ClearITPendingBit(EXTI_Line7);
}
if(EXTI_GetITStatus(EXTI_Line9)!=RESET) //判断发现是外部中断线9触发
{
if(Bit_SET == GPIO_ReadInputDataBit(GPIOE,GPIO_Pin_9)) //触发设置为上升下降沿触发，所以要分别写上升沿和下降沿触发后的服务函数
{
//上升沿触发处理内容。自行添加
}
else if(Bit_RESET ==GPIO_ReadInputDataBit(GPIOE, GPIO_Pin_9))
{
//下降沿触发处理内容。自行添加
}
EXTI_ClearITPendingBit(EXTI_Line9);
}
}
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