1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); //#endif NVIC_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 72MHz NVIC_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; } }}转:openorg
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