STM32+外部中断配置

1、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_IRQ

2、ChannelPreemptionPriority =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

3、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 G

4、PIOD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_In

5、terrupt;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 NVI

6、C_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);/#

7、endif设置中断优先级NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); /* 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 = E

8、NABLE;NVIC_Init(&NVIC_InitStructure);/* 允许 EXTI9 中断 */NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;/*配置GPIOD的第一个管角为浮动输入 */NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init

9、(&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 = GPI

10、O_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

11、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

12、);/* 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

13、 to 72MHz*/SysTick_SetReload(9000);/中断周期 1ms/*配置GPIOD的第一个管角为浮动输入 */*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

14、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(&

15、amp;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_