STM32中斷有時候用多了容易亂，特此記錄一下，因為之前一直是M3 M0交叉用，固件庫有些區(qū)別容易弄混，這里說一下M3外部中斷的配置

步驟:

1.將對應(yīng)的IO配置為輸入

2.將IO對應(yīng)的中斷的優(yōu)先等級用NVIC配置好

3.設(shè)置好對應(yīng)IO的中斷模式和觸發(fā)方式

4.將IO所屬的中斷線設(shè)為中斷輸入源

1---------以PB5為例子

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;

GPIO_Init(GPIOB, &GPIO_InitStructure);

2-------------

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

/*USB Insert*/

NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 7;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

3------------

EXTI_InitStructure.EXTI_Line = EXTI_Line5;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

4---------

GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource5);

第四步比如容易被忽略，因為如果是PA口的話默認(rèn)是已經(jīng)作為輸入中斷源 就因為這點浪費了半天時間。。。

接下來就是中斷服務(wù)程序了

void EXTI9_5_IRQHandler(void)

{

if(EXTI_GetITStatus(EXTI_Line5))

{

EXTI_ClearITPendingBit(EXTI_Line5);

}

}