(1)数据手册中相关部分浏览 (2)地址映射时0地址映射到Flash或SRAM (3)中断向量表可以被人为重新映射，一般用来IAP中 (4)STM32采用一维的中断向量表 (5)中断优先级设置有点复杂，后面细说
1.特征 2.系统嘀嗒(SysTick)校准值寄存器 3.向量表在每一个中断函数在startup_stm32f10x_md.s中都有进行定义
2、起始代码中的ISR(1)其实代码中定义了一个Vector数组 (2)WEAK声明的默认ISR (3)用户根据需要提供自己真正有用的ISR (4)中断要配置使能，ISR中要清挂起等，这一点和其他CPU一样
二、STM32的外部中断(EXTI) 1.EXTI 控制器的主要特性如下： 2.外部中断/事件控制器框图 3.外部中断与I/O 映像（AFIO的的中断）AFIO中与中断相关的寄存器有4个
记得再使用之前一定要使能时钟！！！！！
我们有4个AFIO的中断寄存器，则一个寄存器中应该可以处理16个引脚。
最好使用引脚时，设置PA0，PA1....
使用AFIO中的EXTICRx寄存器进行操作
/*** @brief Selects the GPIO pin used as EXTI Line.* @param GPIO_PortSource: selects the GPIO port to be used as source for EXTI lines.* This parameter can be GPIO_PortSourceGPIOx where x can be (A..G).* @param GPIO_PinSource: specifies the EXTI line to be configured.* This parameter can be GPIO_PinSourcex where x can be (0..15).* @retval None*/void GPIO_EXTILineConfig(uint8_t GPIO_PortSource, uint8_t GPIO_PinSource){uint32_t tmp = 0x00;/* Check the parameters */assert_param(IS_GPIO_EXTI_PORT_SOURCE(GPIO_PortSource));assert_param(IS_GPIO_PIN_SOURCE(GPIO_PinSource));tmp = ((uint32_t)0x0F) << (0x04 * (GPIO_PinSource & (uint8_t)0x03));AFIO->EXTICR[GPIO_PinSource >> 0x02] &= ~tmp;AFIO->EXTICR[GPIO_PinSource >> 0x02] |= (((uint32_t)GPIO_PortSource) << (0x04 * (GPIO_PinSource & (uint8_t)0x03)));} 1.外部中断配置寄存器 1(AFIO_EXTICR1) 2.外部中断配置寄存器 2(AFIO_EXTICR2) 4.如何实际编程使用外部中断(1)时钟设置并打开相应GPIO模块时钟 (2)将相应GPIO配置为浮空输入 (3)NVIC设置 (4)将外部中断线和配套的GPIO进行连接映射
(5)外部中断线使能触发 (6)准备好ISR，并在ISR处等待执行中断程序即可
(7)记得!!!!!!!!!执行完ISR后记得将中断清除。
5.外部中断 VS 外部事件中断外部中断：需要CPU，中断处理程序的参与
外部事件中断：不需要CPU参与
我们一般使用外部中断，不使用外部事件中断，因为我们不知道该器件是否接受脉冲信号。
6.相关寄存器 1. 上升沿触发选择寄存器（EXTI_RTSR） 2.下降沿触发选择寄存器（EXTI_FTSR） 3.中断屏蔽寄存器（EXTI_IMR） 4.挂起寄存器（EXTI_PR） 三、标准库中NVIC(中断优先级)模块分析因为中断处理是在CPU内部进行的，所以没有单独的.c和.h文件
NVIC在【misc.c】中
1.抢占优先级 VS 次优先级当抢占优先级的不同时，抢占优先级小的先执行，然后在执行优先级大的。
当抢占优先级相同时，次优先级小的不能抢占次优先级大的
当相同抢占优先级的程序进行中断时，次优先级小的可以抢先执行，在执行次优先级大的。
//PreemptionPriority：抢优先级uint8_t NVIC_IRQChannelPreemptionPriority; /*!< Specifies the pre-emption priority for the IRQ channelspecified in NVIC_IRQChannel. This parameter can be a valuebetween 0 and 15 as described in the table @ref NVIC_Priority_Table *///次优先级【同一个抢占级别中进行判断的】uint8_t NVIC_IRQChannelSubPriority; /*!< Specifies the subpriority level for the IRQ channel specifiedin NVIC_IRQChannel. This parameter can be a valuebetween 0 and 15 as described in the table @ref NVIC_Priority_Table */ 2.优先级组 /**pre-emption：抢占优先级subpriority：次优先级*/#define NVIC_PriorityGroup_0 ((uint32_t)0x700) /*!< 0 bits for pre-emption priority4 bits for subpriority=》2的4次方*/#define NVIC_PriorityGroup_1 ((uint32_t)0x600) /*!< 1 bits for pre-emption priority3 bits for subpriority=>2的3次方*/#define NVIC_PriorityGroup_2 ((uint32_t)0x500) /*!< 2 bits for pre-emption priority2 bits for subpriority */#define NVIC_PriorityGroup_3 ((uint32_t)0x400) /*!< 3 bits for pre-emption priority1 bits for subpriority */#define NVIC_PriorityGroup_4 ((uint32_t)0x300) /*!< 4 bits for pre-emption priority0 bits for subpriority */ 3.启动方式RAM或者FLASH
/**启动方式：RAM或者FLASH从0x0000 0000到0x080 0000之间的地址是用来设置映射关系因为我们使用FLASH启动，所以将其映射到0x0800 0000*/#define NVIC_VectTab_RAM ((uint32_t)0x20000000)#define NVIC_VectTab_FLASH ((uint32_t)0x08000000)#define IS_NVIC_VECTTAB(VECTTAB) (((VECTTAB) == NVIC_VectTab_RAM) || \((VECTTAB) == NVIC_VectTab_FLASH)) 4.函数 1.NVIC_PriorityGroupConfig在使用时一定设置使用哪一个优先级
/*** @brief Configures the priority grouping: pre-emption priority and subpriority.* @param NVIC_PriorityGroup: specifies the priority grouping bits length. * This parameter can be one of the following values:* @arg NVIC_PriorityGroup_0: 0 bits for pre-emption priority* 4 bits for subpriority* @arg NVIC_PriorityGroup_1: 1 bits for pre-emption priority* 3 bits for subpriority* @arg NVIC_PriorityGroup_2: 2 bits for pre-emption priority* 2 bits for subpriority* @arg NVIC_PriorityGroup_3: 3 bits for pre-emption priority* 1 bits for subpriority* @arg NVIC_PriorityGroup_4: 4 bits for pre-emption priority* 0 bits for subpriority* @retval None*/void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup){/* Check the parameters */assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));/* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;} 2.NVIC_Init void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct){uint32_t tmppriority = 0x00, tmppre = 0x00, tmpsub = 0x0F;/* Check the parameters */assert_param(IS_FUNCTIONAL_STATE(NVIC_InitStruct->NVIC_IRQChannelCmd));assert_param(IS_NVIC_PREEMPTION_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority)); assert_param(IS_NVIC_SUB_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelSubPriority));if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE){/* Compute the Corresponding IRQ Priority --------------------------------*/ tmppriority = (0x700 - ((SCB->AIRCR) & (uint32_t)0x700))>> 0x08;tmppre = (0x4 - tmppriority);tmpsub = tmpsub >> tmppriority;tmppriority = (uint32_t)NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre;tmppriority |= NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub;tmppriority = tmppriority << 0x04;NVIC->IP[NVIC_InitStruct->NVIC_IRQChannel] = tmppriority;/* Enable the Selected IRQ Channels --------------------------------------*/NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =(uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);}else{/* Disable the Selected IRQ Channels -------------------------------------*/NVIC->ICER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =(uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);}} 3.NVIC_SetVectorTable设置中断向量表，看要设置到RAM还是FLASH
void NVIC_SetVectorTable(uint32_t NVIC_VectTab, uint32_t Offset){ /* Check the parameters */assert_param(IS_NVIC_VECTTAB(NVIC_VectTab));assert_param(IS_NVIC_OFFSET(Offset)); SCB->VTOR = NVIC_VectTab | (Offset & (uint32_t)0x1FFFFF80);} 四、标准库中外部中断模块分析 1.EXTI_DeInit //完全去始化void EXTI_DeInit(void){EXTI->IMR = 0x00000000;EXTI->EMR = 0x00000000;EXTI->RTSR = 0x00000000; EXTI->FTSR = 0x00000000; EXTI->PR = 0x000FFFFF;} 2.EXTI_Init将我们设置好的结构体变量写入到寄存器中
/*** @brief Initializes the EXTI peripheral according to the specified* parameters in the EXTI_InitStruct.* @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure* that contains the configuration information for the EXTI peripheral.* @retval None*/void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct){uint32_t tmp = 0;/* Check the parameters */assert_param(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode));assert_param(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger));assert_param(IS_EXTI_LINE(EXTI_InitStruct->EXTI_Line)); assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));tmp = (uint32_t)EXTI_BASE;if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)//表示要使能{/* Clear EXTI line configuration */EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line;EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line;tmp += EXTI_InitStruct->EXTI_Mode;*(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;/* Clear Rising Falling edge configuration */EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line;EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line;/* Select the trigger for the selected external interrupts */if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling){/* Rising Falling edge */EXTI->RTSR |= EXTI_InitStruct->EXTI_Line;EXTI->FTSR |= EXTI_InitStruct->EXTI_Line;}else{tmp = (uint32_t)EXTI_BASE;tmp += EXTI_InitStruct->EXTI_Trigger;*(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;}}else{tmp += EXTI_InitStruct->EXTI_Mode;/* Disable the selected external lines */*(__IO uint32_t *) tmp &= ~EXTI_InitStruct->EXTI_Line;}} 3.EXTI_StructInit如果用户不想自己设置中断值，则可以调用这个函数，这个函数中有默认值可以使用
void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct){EXTI_InitStruct->EXTI_Line = EXTI_LINENONE;EXTI_InitStruct->EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStruct->EXTI_Trigger = EXTI_Trigger_Falling;EXTI_InitStruct->EXTI_LineCmd = DISABLE;} 4.EXTI_GenerateSWInterrupt软件中断，可以对寄存器中其中一位进行中断操作
void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line){/* Check the parameters */assert_param(IS_EXTI_LINE(EXTI_Line));EXTI->SWIER |= EXTI_Line;} 5.EXTI_GetFlagStatus共享中断：判断中断标志位是否真的置1了（判断是哪一个标志进行中断的）
/*** @brief Checks whether the specified EXTI line flag is set or not.* @param EXTI_Line: specifies the EXTI line flag to check.* This parameter can be:* @arg EXTI_Linex: External interrupt line x where x(0..19)* @retval The new state of EXTI_Line (SET or RESET).*/FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line){FlagStatus bitstatus = RESET;/* Check the parameters */assert_param(IS_GET_EXTI_LINE(EXTI_Line));if ((EXTI->PR & EXTI_Line) != (uint32_t)RESET){bitstatus = SET;}else{bitstatus = RESET;}return bitstatus;} 6.EXTI_ClearITPendingBit(中断挂起)中断进入后，就会有一个中断挂起
/*** @brief Clears the EXTI's line pending bits.* @param EXTI_Line: specifies the EXTI lines to clear.* This parameter can be any combination of EXTI_Linex where x can be (0..19).* @retval None*/void EXTI_ClearITPendingBit(uint32_t EXTI_Line){/* Check the parameters */assert_param(IS_EXTI_LINE(EXTI_Line));EXTI->PR = EXTI_Line;} 6.EXTI_ClearFlag清除中断
void EXTI_ClearFlag(uint32_t EXTI_Line){/* Check the parameters */assert_param(IS_EXTI_LINE(EXTI_Line));EXTI->PR = EXTI_Line;} 五、GPIO外部中断程序的移植和调试 0.GPIO外部中断的配置步骤使用HAL_GPIO_Init一步到位（步骤2-步骤5）
1.EXTI的HAL库设置步骤（GPIO外部中断） 2.通用外设驱动模型 3.HAL库中断回调处理机制介绍 1.建立工程模板STM32项目工程的搭建-CSDN博客
2.查看官方示例代码以ARM3.0的按键示例程序作为参考，移植到PZ6806L开发板上。
stm32f10x_it.c将我们在初始化文件（STM32F10x_md.c）中的中断函数进行覆盖重写。
startup_stm32f10x_md.s这个文件中存放是有中断处理函数的定义
我们如果想要执行（使用）这个中断，则将在md文件中将函数名字复制出来，然后再stm32f10x_it.c文件中使用
stm32f10x_it.h我们上面再stm32f10x_it.c中重写了一个函数，则要再这个.h文件中进行声明
main.c RCC_Configuragtion作用：将时钟设置为72MHZ，将相关的开关打开。
GPIO_Configuration NVIC_ConfigurationNVIC中断优先级的初始化
3.整个main函数的流程1）初始化RCC
2）初始化GPIO
3）初始化NVIC
4）设置外部中断（将中断线和GPIO线连接起来）
5）外部中断线的模式选择（我们一般选择外部中断，不使用外部事件中断）
6）产生软件中断触发事件
4.开始移植 1.按键的接线问题这个程序的执行结果是：按下按键一（KEY1），使得LED16（也就是4*4矩阵显示屏上最后一排灯亮起）
独立按键的JP1接到PB0-PB7
LED8-LED16的J34接到PA0-PA7
因为操作库函数的时候只能一位一位操作，所以我们只能选择其中一个引脚进行操作。
我们选择KEY1和LED16进行操作，分别对应PB0和PA7
2.关于中断几的选择由上面可知我们KEY1对应的是PB0，由0可知应该选择EXIT0
确定好后，再stm32f10x.c和stm32f10x.h文件中进行重写和声明【我们可以再stm32f10x_md.c文件中查看应该调用哪一个函数】
3.EXTI0_IRQHandler的移植注意点：本来我们应该再stm32f10x_it.c文件中去查找这个中断函数的初始化，但是普中科技的AMR3.0的官方代码将这个中断函数的初始化写再了exit.c文件中。
stm32f10x_it.c */void EXTI0_IRQHandler(void){//检测制定的EXTI线路触发if(EXTI_GetITStatus(EXTI_Line0)==1){/*delay_ms(10);if(KEY1==0){led2=0;}*/}//清除EXTI线路挂起位EXTI_ClearITPendingBit(EXTI_Line0);} stm32f10x_it.h //声明自己写的EXIT0void EXTI0_IRQHandler(void); 4.RCC_Configuration的移植 1.RCC的使能 //RCC的配置void RCC_Configuration(void){//因为起始代码中已经调用SystemInit将主时钟设置为72MHZ//所以我们这里RCC直接使能时钟就可以//使能GPIO端口//因为我们使用到的是PB0和PB8，所以只使用到GPIOBRCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO,ENABLE);} 2.GPIO_Configuration的移植 //GPIO初始化void CPIO_Configuration(void){GPIO_InitTypeDef GPIO_InitStructure;//PB0 -- Key1 -- EXIT2PA7 ---LED16//PB0 -- Key1 -- EXIT2【按键是输入获取】GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //配置浮空输入GPIO_Init(GPIOB, &GPIO_InitStructure);//PA7 ---LED16【LED的显示输出】GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出GPIO_Init(GPIOA, &GPIO_InitStructure);GPIO_WriteBit(GPIOA, GPIO_Pin_7, Bit_RESET);// 默认输出0让LED亮} 3.NVIC优先级的移植NVIC_IRQChannel：在misc.h中定义
void NVIC_Configuration(void){NVIC_InitTypeDef NVIC_InitStructure;#ifdef VECT_TAB_RAM /* Set the Vector Table base location at 0x20000000 */ NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); //分配中断向量表#else /* VECT_TAB_FLASH *///表示从FLASH中启动/* Set the Vector Table base location at 0x08000000 */ NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); #endif/* Configure one bit for preemption priority */// NVIC_PriorityGroup_1：2个抢占优先级，8个次优先级NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); //设置中断优先级/* Enable the EXTI2 Interrupt */NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn; //中断通道NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //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} 4.main函数 //函数声明//RCC的配置void RCC_Configuration(void);//GPIO初始化void GPIO_Configuration(void);void NVIC_Configuration(void);//全局变量定义EXTI_InitTypeDef EXTI_InitStructure;ErrorStatus HSEStatartUpStatus;int main(){//系统时钟配置RCC_Configuration();//NVIC配置NVIC_Configuration();//配置GPIOGPIO_Configuration();//将EXTI线0连接到PB0【处理按键中断】GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource0);/* Configure Key Button EXTI Line to generate an interrupt on falling edge */ //配置按钮中断线触发方式EXTI_InitStructure.EXTI_Line = EXTI_Line0;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/* Generate software interrupt: simulate a falling edge applied on Key Button EXTI line */// EXTI_GenerateSWInterrupt(EXTI_Line0); //EXTI_Line2中断允许 到此中断配置完成,可以写中断处理函数。while (1);return 0;} 5.中断函数的处理(stm32f10x_it.c)因为我们要在中断函数中对LED进行点亮/熄灭，所以需要对LED进行读取和写入。
所以要使用到我们的【GPIO_ReadInputDataBit】和【GPIO_WriteBit】
void EXTI0_IRQHandler(void){//检测制定的EXTI线路触发if(EXTI_GetITStatus(EXTI_Line0)==1){//此时控制的是LED，LED对应的是PA0//我们想要对LED进行点亮/熄灭//则应该先将此时LED的状态位读取出来，然后在取反写进去GPIO_WriteBit(GPIOA,GPIO_Pin_0,(BitAction)((1-GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0))));}//清除EXTI线路挂起位EXTI_ClearITPendingBit(EXTI_Line0);} 6.对LED的初始化在对GPIO初始化的时候一起将lED一起点亮
// 默认输出1让LED亮GPIO_WriteBit(GPIOA, GPIO_Pin_7, Bit_SET); 3.完整代码 main.c #include "stm32f10x.h" // Device header/**使用库函数对STM32进行GPIO的外部中断按下KEY1对LED16进行点亮/熄灭*///函数声明//RCC的配置void RCC_Configuration(void);//GPIO初始化void GPIO_Configuration(void);void NVIC_Configuration(void);//全局变量定义EXTI_InitTypeDef EXTI_InitStructure;ErrorStatus HSEStatartUpStatus;int main(){//系统时钟配置RCC_Configuration();//NVIC配置NVIC_Configuration();//配置GPIOGPIO_Configuration();//将EXTI线0连接到PB0【处理按键中断】GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource0);/* Configure Key Button EXTI Line to generate an interrupt on falling edge */ //配置按钮中断线触发方式EXTI_InitStructure.EXTI_Line = EXTI_Line0;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/* Generate software interrupt: simulate a falling edge applied on Key Button EXTI line *///人为产生中断//如果不想要一进来就产生中断，则应该注释掉//EXTI_Line0中断允许 到此中断配置完成,可以写中断处理函数。EXTI_GenerateSWInterrupt(EXTI_Line0); while (1);return 0;}//RCC的配置void RCC_Configuration(void){//因为起始代码中已经调用SystemInit将主时钟设置为72MHZ//所以我们这里RCC直接使能时钟就可以//使能GPIO端口//因为我们使用到的是PB0和PB8，所以只使用到GPIOBRCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO,ENABLE);}//GPIO初始化void CPIO_Gonfiguration(void){GPIO_InitTypeDef GPIO_InitStructure;//PB0 -- Key1 -- EXIT2PA7 ---LED16//PB0 -- Key1 -- EXIT2【按键是输入获取】GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //配置浮空输入GPIO_Init(GPIOB, &GPIO_InitStructure);//PA7 ---LED16【LED的显示输出】GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出GPIO_Init(GPIOA, &GPIO_InitStructure);// 默认输出1让LED亮GPIO_WriteBit(GPIOA, GPIO_Pin_7, Bit_SET);}void NVIC_Configuration(void){NVIC_InitTypeDef NVIC_InitStructure;#ifdef VECT_TAB_RAM /* Set the Vector Table base location at 0x20000000 */ NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); //分配中断向量表#else /* VECT_TAB_FLASH *///表示从FLASH中启动/* Set the Vector Table base location at 0x08000000 */ NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); #endif/* Configure one bit for preemption priority */// NVIC_PriorityGroup_1：2个抢占优先级，8个次优先级NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); //设置中断优先级/* Enable the EXTI2 Interrupt */NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn; //中断通道NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //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} stm32f10x_it.c void EXTI0_IRQHandler(void){//检测制定的EXTI线路触发if(EXTI_GetITStatus(EXTI_Line0)==1){//此时控制的是LED，LED对应的是PA0//我们想要对LED进行点亮/熄灭//则应该先将此时LED的状态位读取出来，然后在取反写进去GPIO_WriteBit(GPIOA,GPIO_Pin_0,(BitAction)((1-GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0))));}//清除EXTI线路挂起位EXTI_ClearITPendingBit(EXTI_Line0);}
