STM32外部中断处理流程

STM32 外部中断配置2009-07-22 14:161配置中断1、分配中断向量表：/* Set the Vector Table base location at 0x20000000 */NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);2、设置中断优先级：NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //设置中断优先级3、初始化外部中断：/*允许EXTI4中断 */NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQChannel; //中断通道NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = PreemptionPriorityValue;//强占优先级NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //次优先级NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //通道中断使能NVIC_Init(&NVIC_InitStructure); //初始化中断注意：如果我们配置的外部针脚为PA4，或PB4，或PC4，PD4等，那么采用的外部中断也必须是EXTI4，同样，如果外部中断针脚是PA1，PB1，PC1，PD1 那么中断就要用EXTI1，其他类推。

2配置GPIO针脚作为外部中断的触发事件1、选择IO针脚GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;注意，如果的针脚是端口的4号针脚，配置的中断一定是EXTI42、配置针脚为输入GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;3、初始化针脚GPIO_Init(GPIOD,&GPIO_InitStructure);3配置EXTI线，使中断线和IO针脚线连接上1、将EXTI线连接到IO端口上将EXTI线4连接到端口GPIOD的第4个针脚上GPIO_EXTILineConfig(GPIO_PortSourceGPIOD,GPIO_PinSource4);注意：如果配置的针脚是4号，那么参数必须是GPIO_PinSource4如果配置的针脚是3号，那么参数必须是GPIO_PinSource32、配置中断边沿/*配置EXTI线0上出现下降沿，则产生中断*/EXTI_InitStructure.EXTI_Line = EXTI_Line4;注意：如果配置的4号针脚，那么EXTI_Line4是必须的EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿触发EXTI_InitStructure.EXTI_LineCmd = ENABLE; //中断线使能EXTI_Init(&EXTI_InitStructure); //初始化中断EXTI_GenerateSWInterrupt(EXTI_Line4); //EXTI_Line4中断允许到此中断配置完成，可以写中断处理函数。

举例：配置函数/************************************************************************** 函数名 NVIC_Configration* 描述配置各个中断寄存器* 输入无* 输出无* 返回值无****************************************************************************/void NVIC_Configration(void){NVIC_InitTypeDef NVIC_InitStructure;//#ifdef VECT_TAB_RAM/* Set the Vector Table base location at 0x20000000 */NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);//#else /* VECT_TAB_FLASH *//* Set the Vector Table base location at 0x08000000 *///NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);//#endifNVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //设置中断优先级/*允许EXTI4中断 */NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQChannel;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = PreemptionPriorityValue;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);/*允许EXTI9中断*/NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);/*配置SysTick处理优先级：优先级以及子优先级*/}/************************************************************************ * 函数名 :GPIO_Configuration(void)* 描述 :配置TIM2阵脚* 输入：无* 输出：无* 返回：无************************************************************************/ void GPIO_Configuration(void){/* GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Pin =GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA,&GPIO_InitStructure); */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;GPIO_Init(GPIOC,&GPIO_InitStructure);/*配置GPIOD的第一个管角为浮动输入*/GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_Init(GPIOD,&GPIO_InitStructure);/*配置GPIOB的第9个管脚为浮动输入*/GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_Init(GPIOB,&GPIO_InitStructure);}/*************************************************************** 函数 SysTick_Configuration* 描述设置SysTick* 输入无* 输出无* 返回值无***************************************************************/void SysTick_Configuration(void){/*配置 HCLK 时钟做为SysTick 时钟源*/SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8); //系统时钟8分频72MHzNVIC_SystemHandlerPriorityConfig(SystemHandler_SysTick, 8,2);/*SysTick Interrupt each 1000Hz with HCLK equal to 72MHz*/SysTick_SetReload(9000);//中断周期1ms/*Enable the SysTick Interrupt */SysTick_ITConfig(ENABLE);//打开中断SysTick_CounterCmd(SysTick_Counter_Enable);SysTick_CounterCmd(SysTick_Counter_Clear);}/****************************************************************************** * 函数名 EXTI_Configuration* 描述配置EXTI线* 输入无* 输出无* 返回值无******************************************************************************/ void EXTI_Configuration(void){/*将EXTI线0连接到PA0*/GPIO_EXTILineConfig(GPIO_PortSourceGPIOD,GPIO_PinSource4);/*配置EXTI线0上出现下降沿，则产生中断*/EXTI_InitStructure.EXTI_Line = EXTI_Line4;EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;EXTI_InitStructure.EXTI_LineCmd = ENABLE;EXTI_Init(&EXTI_InitStructure);EXTI_GenerateSWInterrupt(EXTI_Line4);/*将EXTI线9连接到PB9上*/GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource9);/*将EXTI线9上出现下降沿产生中断*/EXTI_InitStructure.EXTI_Line = EXTI_Line9;EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;EXTI_InitStructure.EXTI_LineCmd = ENABLE;EXTI_Init(&EXTI_InitStructure);EXTI_GenerateSWInterrupt(EXTI_Line9);}中断函数：void EXTI4_IRQHandler(void){if(EXTI_GetITStatus(EXTI_Line4)!= RESET){EXTI_ClearITPendingBit(EXTI_Line4);if(Ledflag == 0){Ledflag = 1;GPIOC->ODR |= 0X00000080;}else{Ledflag = 0;GPIOC->ODR &= 0XFFFFFF7F;}}}。