源码：https://download.csdn.net/download/u012651389/15326961
完成代码：
第一步 1-使能中断请求
#define KEY_IN_GPIO_Clock RCC_APB2Periph_GPIOA
#define KEY_IN_GPIO_Port GPIOA
#define KEY_IN_GPIO_Pin GPIO_Pin_0
#define KEY_IN_GPIO_Pin_Bit 0
#define KEY_IN_GPIO_Modle GPIO_Mode_IN_FLOATING
void fn_Key_GPIO_Config(GPIO_TypeDef* _GPIOx, uint16_t GPIO_Pin ,GPIOMode_TypeDef _GPIOMode_TypeDef){
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Mode = _GPIOMode_TypeDef;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin;
if(_GPIOx==GPIOA){
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA ,ENABLE ) ;
}
else if(_GPIOx==GPIOB){
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB ,ENABLE ) ;
}
else if(_GPIOx==GPIOC){
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOC ,ENABLE ) ;
}
else {
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOD ,ENABLE ) ;
}
#endif
GPIO_Init( _GPIOx , &GPIO_InitStruct );
}
第二步 2-配置中断优先级分组
#define EXIT_IN_GPIO_Clock RCC_APB2Periph_AFIO
#define EXIT_IN_GPIO_PortSource GPIO_PortSourceGPIOA
#define EXIT_IN_GPIO_PinSource GPIO_PinSource0
#define EXIT_IN_EXTI_Mode EXTI_Mode_Interrupt
#define EXIT_IN_EXTI_Trigger EXTI_Trigger_Rising
#define EXIT_IN_EXTI_Line EXTI_Line0
#define EXIT_IN_EXTI_LineCmd ENABLE
void fn_EXIT_GPIO_Config(void){
EXTI_InitTypeDef EXTI_InitStruct;
RCC_APB2PeriphClockCmd( EXIT_IN_GPIO_Clock ,ENABLE ) ; //注意：我们除了开 GPIO 的端口时钟外，我们还打开了 AFIO 的时钟，
GPIO_EXTILineConfig(EXIT_IN_GPIO_PortSource,EXIT_IN_GPIO_PinSource);
// GPIO_EXTILineConfig 函数用来指定中断/事件线的输入源，它实际是设定外部中断配
// 置寄存器的 AFIO_EXTICRx 值，该函数接收两个参数，第一个参数指定 GPIO 端口源，第
// 二个参数为选择对应 GPIO 引脚源编号。
// EXTI初始化配置的变量
EXTI_InitStruct.EXTI_Line = EXIT_IN_EXTI_Line;
EXTI_InitStruct.EXTI_Mode = EXIT_IN_EXTI_Mode;
EXTI_InitStruct.EXTI_Trigger = EXIT_IN_EXTI_Trigger;
EXTI_InitStruct.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStruct);
fn_NVIC_Config();
// 调用 NVIC_Configuration函数完成对按键 1、按键 2 优先级配置并使能中断通道
}第三步 3-配置NVIC寄存器，初始化NVIC_InitTypeDef 对优先级进行设置
注意中断源 比如PA_0 PA_5
EXTI0_IRQn = 6, /*!< EXTI Line0 Interrupt */
EXTI1_IRQn = 7, /*!< EXTI Line1 Interrupt */
EXTI2_IRQn = 8, /*!< EXTI Line2 Interrupt */
EXTI3_IRQn = 9, /*!< EXTI Line3 Interrupt */
EXTI4_IRQn = 10, /*!< EXTI Line4 Interrupt */
EXTI9_5_IRQn = 23, /*!< External Line[9:5] Interrupts */
EXTI15_10_IRQn = 40, /*!< External Line[15:10] Interrupts */
static fn_NVIC_Config(void){
// 调用 NVIC_Configuration函数完成对按键 1、按键 2 优先级配置并使能中断通道
NVIC_InitTypeDef NVIC_InitStruct;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStruct.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1; //先比较抢占优先级
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1; //先比较抢子先级
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
}第四步 4-编写中断服务函数
void EXTI0_IRQHandler(void){
// EXTI_GetITStatus 函数用来获取 EXTI 的中断标志位状态，如果 EXTI 线有中断发生函
//数返回“SET”否则返回“RESET”。实际上，EXTI_GetITStatus 函数是通过读取
//EXTI_PR寄存器值来判断 EXTI线状态的。
if(EXTI_GetITStatus(EXIT_IN_EXTI_Line)!= RESET){
if(GPIO_ReadInputDataBit(KEY_IN_GPIO_Port, KEY_IN_GPIO_Pin)==1){
fn_led_toggle(LED_OUT_GPIO_Port,LED_OUT_GPIO_Pin);
}
}
EXTI_ClearITPendingBit(EXIT_IN_EXTI_Line); //清除中断标志位
}
理论部分：
/** @addtogroup CMSIS_CM3_NVIC CMSIS CM3 NVIC
memory mapped structure for Nested Vectored Interrupt Controller (NVIC)
@{
*/
typedef struct
{
__IO uint32_t ISER[8]; /*!< Offset: 0x000 Interrupt Set Enable Register */
uint32_t RESERVED0[24];
__IO uint32_t ICER[8]; /*!< Offset: 0x080 Interrupt Clear Enable Register */
uint32_t RSERVED1[24];
__IO uint32_t ISPR[8]; /*!< Offset: 0x100 Interrupt Set Pending Register */
uint32_t RESERVED2[24];
__IO uint32_t ICPR[8]; /*!< Offset: 0x180 Interrupt Clear Pending Register */
uint32_t RESERVED3[24];
__IO uint32_t IABR[8]; /*!< Offset: 0x200 Interrupt Active bit Register */
uint32_t RESERVED4[56];
__IO uint8_t IP[240]; /*!< Offset: 0x300 Interrupt Priority Register (8Bit wide) */
uint32_t RESERVED5[644];
__O uint32_t STIR; /*!< Offset: 0xE00 Software Trigger Interrupt Register */
} NVIC_Type;
/*@}*/ /* end of group CMSIS_CM3_NVIC */
矢量中断控制器(NVIC)和它使用的寄存器。NVIC支持:最多81个中断(取决于STM32设备类型，参考数据表)，每个中断的可编程优先级为0-15。更高层次对应于一个较低的优先级,所以0级中断优先级最高的中断信号和脉冲检测动态重新安排中断的优先级值分组成集团的机会吧中断优先级和subpriority字段tail-chaining外部屏敝中断(敝中断)处理器自动堆栈状态异常进入和unstacks这个状态异常退出,没有指令的开销。这提供了低延迟的异常处理。
F103 在内核水平上搭载了一个异常响应系统， 支持为数众多的系统异常和外部中断。其中系统异常有 8 个
typedef enum IRQn
{
/****** Cortex-M3 Processor Exceptions Numbers ***************************************************/
NonMaskableInt_IRQn = -14, /*!< 2 Non Maskable Interrupt */
MemoryManagement_IRQn = -12, /*!< 4 Cortex-M3 Memory Management Interrupt */
BusFault_IRQn = -11, /*!< 5 Cortex-M3 Bus Fault Interrupt */
UsageFault_IRQn = -10, /*!< 6 Cortex-M3 Usage Fault Interrupt */
SVCall_IRQn = -5, /*!< 11 Cortex-M3 SV Call Interrupt */
DebugMonitor_IRQn = -4, /*!< 12 Cortex-M3 Debug Monitor Interrupt */
PendSV_IRQn = -2, /*!< 14 Cortex-M3 Pend SV Interrupt */
SysTick_IRQn = -1, /*!< 15 Cortex-M3 System Tick Interrupt */
/****** STM32 specific Interrupt Numbers *********************************************************/
WWDG_IRQn = 0, /*!< Window WatchDog Interrupt */
PVD_IRQn = 1, /*!< PVD through EXTI Line detection Interrupt */
TAMPER_IRQn = 2, /*!< Tamper Interrupt */
RTC_IRQn = 3, /*!< RTC global Interrupt */
FLASH_IRQn = 4, /*!< FLASH global Interrupt */
RCC_IRQn = 5, /*!< RCC global Interrupt */
EXTI0_IRQn = 6, /*!< EXTI Line0 Interrupt */
EXTI1_IRQn = 7, /*!< EXTI Line1 Interrupt */
EXTI2_IRQn = 8, /*!< EXTI Line2 Interrupt */
EXTI3_IRQn = 9, /*!< EXTI Line3 Interrupt */
EXTI4_IRQn = 10, /*!< EXTI Line4 Interrupt */
DMA1_Channel1_IRQn = 11, /*!< DMA1 Channel 1 global Interrupt */
DMA1_Channel2_IRQn = 12, /*!< DMA1 Channel 2 global Interrupt */
DMA1_Channel3_IRQn = 13, /*!< DMA1 Channel 3 global Interrupt */
DMA1_Channel4_IRQn = 14, /*!< DMA1 Channel 4 global Interrupt */
DMA1_Channel5_IRQn = 15, /*!< DMA1 Channel 5 global Interrupt */
DMA1_Channel6_IRQn = 16, /*!< DMA1 Channel 6 global Interrupt */
DMA1_Channel7_IRQn = 17, /*!< DMA1 Channel 7 global Interrupt */NVIC 简介:
NVIC 是嵌套向量中断控制器，控制着整个芯片中断相关的功能，它跟内核紧密耦合，是内核里面的一个外设。但是各个芯片厂商在设计芯片的时候会对 Cortex-M3 内核里面的 NVIC 进行裁剪，把不需要的部分去掉，所以说 STM32的 NVIC是 Cortex-M3 的 NVIC 的一个子集。
在 MISC.c 文件里面
二 ： 中断优先级的定义
只用了高四位
主从优先级
分组成抢占优先级和子优先级。如果有多个中断同时响应，抢占优先级高的就会 抢占 抢占优先级低的优先得到执行，如果抢占优先级相同，就比较子优先级。如果抢占优先级和子优先级都相同的话，就比较他们的硬件中断编号，编号越小，优先级越高。
最后对比中断的硬件优先级编号
优先级分组
1 NVIC->IPRx
2 优先级的分组由内核外设 SCB 的应用程序中断及复位控制寄存器 AIRCR 的PRIGROUP[10:8]位决定
@code
The table below gives the allowed values of the pre-emption priority and subpriority according
to the Priority Grouping configuration performed by NVIC_PriorityGroupConfig function
============================================================================================================================
NVIC_PriorityGroup | NVIC_IRQChannelPreemptionPriority | NVIC_IRQChannelSubPriority | Description
============================================================================================================================
NVIC_PriorityGroup_0 | 0 | 0-15 | 0 bits for pre-emption priority
| | | 4 bits for subpriority
----------------------------------------------------------------------------------------------------------------------------
NVIC_PriorityGroup_1 | 0-1 | 0-7 | 1 bits for pre-emption priority
| | | 3 bits for subpriority
----------------------------------------------------------------------------------------------------------------------------
NVIC_PriorityGroup_2 | 0-3 | 0-3 | 2 bits for pre-emption priority
| | | 2 bits for subpriority
----------------------------------------------------------------------------------------------------------------------------
NVIC_PriorityGroup_3 | 0-7 | 0-1 | 3 bits for pre-emption priority
| | | 1 bits for subpriority
----------------------------------------------------------------------------------------------------------------------------
NVIC_PriorityGroup_4 | 0-15 | 0 | 4 bits for pre-emption priority
| | | 0 bits for subpriority
============================================================================================================================
@endcode
三 : 中断编程的顺序
所以 开中断要 中断 和 NVIC 使能大门一起决定。
代码一：进行分组
/**
* @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;
}代码二：NVIC 中断源初始化
/**
* @brief NVIC Init Structure definition
*/
typedef struct
{
uint8_t NVIC_IRQChannel; /*!< Specifies the IRQ channel to be enabled or disabled.
This parameter can be a value of @ref IRQn_Type
(For the complete STM32 Devices IRQ Channels list, please
refer to stm32f10x.h file) */
uint8_t NVIC_IRQChannelPreemptionPriority; /*!< Specifies the pre-emption priority for the IRQ channel
specified in NVIC_IRQChannel. This parameter can be a value
between 0 and 15 as described in the table @ref NVIC_Priority_Table */
uint8_t NVIC_IRQChannelSubPriority; /*!< Specifies the subpriority level for the IRQ channel specified
in NVIC_IRQChannel. This parameter can be a value
between 0 and 15 as described in the table @ref NVIC_Priority_Table */
FunctionalState NVIC_IRQChannelCmd; /*!< Specifies whether the IRQ channel defined in NVIC_IRQChannel
will be enabled or disabled.
This parameter can be set either to ENABLE or DISABLE */
} NVIC_InitTypeDef;
/**
* @}
*/代码2 表1
/**
* @brief STM32F10x Interrupt Number Definition, according to the selected device
* in @ref Library_configuration_section
*/
typedef enum IRQn
{
/****** Cortex-M3 Processor Exceptions Numbers ***************************************************/
NonMaskableInt_IRQn = -14, /*!< 2 Non Maskable Interrupt */
MemoryManagement_IRQn = -12, /*!< 4 Cortex-M3 Memory Management Interrupt */
BusFault_IRQn = -11, /*!< 5 Cortex-M3 Bus Fault Interrupt */
UsageFault_IRQn = -10, /*!< 6 Cortex-M3 Usage Fault Interrupt */
SVCall_IRQn = -5, /*!< 11 Cortex-M3 SV Call Interrupt */
DebugMonitor_IRQn = -4, /*!< 12 Cortex-M3 Debug Monitor Interrupt */
PendSV_IRQn = -2, /*!< 14 Cortex-M3 Pend SV Interrupt */
SysTick_IRQn = -1, /*!< 15 Cortex-M3 System Tick Interrupt */
/****** STM32 specific Interrupt Numbers *********************************************************/
WWDG_IRQn = 0, /*!< Window WatchDog Interrupt */
PVD_IRQn = 1, /*!< PVD through EXTI Line detection Interrupt */
TAMPER_IRQn = 2, /*!< Tamper Interrupt */
RTC_IRQn = 3, /*!< RTC global Interrupt */
FLASH_IRQn = 4, /*!< FLASH global Interrupt */
RCC_IRQn = 5, /*!< RCC global Interrupt */
EXTI0_IRQn = 6, /*!< EXTI Line0 Interrupt */
EXTI1_IRQn = 7, /*!< EXTI Line1 Interrupt */
EXTI2_IRQn = 8, /*!< EXTI Line2 Interrupt */
EXTI3_IRQn = 9, /*!< EXTI Line3 Interrupt */
EXTI4_IRQn = 10, /*!< EXTI Line4 Interrupt */
DMA1_Channel1_IRQn = 11, /*!< DMA1 Channel 1 global Interrupt */
DMA1_Channel2_IRQn = 12, /*!< DMA1 Channel 2 global Interrupt */
DMA1_Channel3_IRQn = 13, /*!< DMA1 Channel 3 global Interrupt */
DMA1_Channel4_IRQn = 14, /*!< DMA1 Channel 4 global Interrupt */
DMA1_Channel5_IRQn = 15, /*!< DMA1 Channel 5 global Interrupt */
DMA1_Channel6_IRQn = 16, /*!< DMA1 Channel 6 global Interrupt */
DMA1_Channel7_IRQn = 17, /*!< DMA1 Channel 7 global Interrupt */
#ifdef STM32F10X_HD
ADC1_2_IRQn = 18, /*!< ADC1 and ADC2 global Interrupt */
USB_HP_CAN1_TX_IRQn = 19, /*!< USB Device High Priority or CAN1 TX Interrupts */
USB_LP_CAN1_RX0_IRQn = 20, /*!< USB Device Low Priority or CAN1 RX0 Interrupts */
CAN1_RX1_IRQn = 21, /*!< CAN1 RX1 Interrupt */
CAN1_SCE_IRQn = 22, /*!< CAN1 SCE Interrupt */
EXTI9_5_IRQn = 23, /*!< External Line[9:5] Interrupts */
TIM1_BRK_IRQn = 24, /*!< TIM1 Break Interrupt */
TIM1_UP_IRQn = 25, /*!< TIM1 Update Interrupt */
TIM1_TRG_COM_IRQn = 26, /*!< TIM1 Trigger and Commutation Interrupt */
TIM1_CC_IRQn = 27, /*!< TIM1 Capture Compare Interrupt */
TIM2_IRQn = 28, /*!< TIM2 global Interrupt */
TIM3_IRQn = 29, /*!< TIM3 global Interrupt */
TIM4_IRQn = 30, /*!< TIM4 global Interrupt */
I2C1_EV_IRQn = 31, /*!< I2C1 Event Interrupt */
I2C1_ER_IRQn = 32, /*!< I2C1 Error Interrupt */
I2C2_EV_IRQn = 33, /*!< I2C2 Event Interrupt */
I2C2_ER_IRQn = 34, /*!< I2C2 Error Interrupt */
SPI1_IRQn = 35, /*!< SPI1 global Interrupt */
SPI2_IRQn = 36, /*!< SPI2 global Interrupt */
USART1_IRQn = 37, /*!< USART1 global Interrupt */
USART2_IRQn = 38, /*!< USART2 global Interrupt */
USART3_IRQn = 39, /*!< USART3 global Interrupt */
EXTI15_10_IRQn = 40, /*!< External Line[15:10] Interrupts */
RTCAlarm_IRQn = 41, /*!< RTC Alarm through EXTI Line Interrupt */
USBWakeUp_IRQn = 42, /*!< USB Device WakeUp from suspend through EXTI Line Interrupt */
TIM8_BRK_IRQn = 43, /*!< TIM8 Break Interrupt */
TIM8_UP_IRQn = 44, /*!< TIM8 Update Interrupt */
TIM8_TRG_COM_IRQn = 45, /*!< TIM8 Trigger and Commutation Interrupt */
TIM8_CC_IRQn = 46, /*!< TIM8 Capture Compare Interrupt */
ADC3_IRQn = 47, /*!< ADC3 global Interrupt */
FSMC_IRQn = 48, /*!< FSMC global Interrupt */
SDIO_IRQn = 49, /*!< SDIO global Interrupt */
TIM5_IRQn = 50, /*!< TIM5 global Interrupt */
SPI3_IRQn = 51, /*!< SPI3 global Interrupt */
UART4_IRQn = 52, /*!< UART4 global Interrupt */
UART5_IRQn = 53, /*!< UART5 global Interrupt */
TIM6_IRQn = 54, /*!< TIM6 global Interrupt */
TIM7_IRQn = 55, /*!< TIM7 global Interrupt */
DMA2_Channel1_IRQn = 56, /*!< DMA2 Channel 1 global Interrupt */
DMA2_Channel2_IRQn = 57, /*!< DMA2 Channel 2 global Interrupt */
DMA2_Channel3_IRQn = 58, /*!< DMA2 Channel 3 global Interrupt */
DMA2_Channel4_5_IRQn = 59 /*!< DMA2 Channel 4 and Channel 5 global Interrupt */
#endif /* STM32F10X_HD */ 代码3：中断人口函数
__Vectors DCD __initial_sp ; Top of Stack
DCD Reset_Handler ; Reset Handler
DCD NMI_Handler ; NMI Handler
DCD HardFault_Handler ; Hard Fault Handler
DCD MemManage_Handler ; MPU Fault Handler
DCD BusFault_Handler ; Bus Fault Handler
DCD UsageFault_Handler ; Usage Fault Handler
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD SVC_Handler ; SVCall Handler
DCD DebugMon_Handler ; Debug Monitor Handler
DCD 0 ; Reserved
DCD PendSV_Handler ; PendSV Handler
DCD SysTick_Handler ; SysTick Handler
; External Interrupts
DCD WWDG_IRQHandler ; Window Watchdog
DCD PVD_IRQHandler ; PVD through EXTI Line detect
DCD TAMPER_IRQHandler ; Tamper
DCD RTC_IRQHandler ; RTC
DCD FLASH_IRQHandler ; Flash
DCD RCC_IRQHandler ; RCC
DCD EXTI0_IRQHandler ; EXTI Line 0
DCD EXTI1_IRQHandler ; EXTI Line 1
DCD EXTI2_IRQHandler ; EXTI Line 2
DCD EXTI3_IRQHandler ; EXTI Line 3
DCD EXTI4_IRQHandler ; EXTI Line 4
DCD DMA1_Channel1_IRQHandler ; DMA1 Channel 1
DCD DMA1_Channel2_IRQHandler ; DMA1 Channel 2
DCD DMA1_Channel3_IRQHandler ; DMA1 Channel 3
DCD DMA1_Channel4_IRQHandler ; DMA1 Channel 4
DCD DMA1_Channel5_IRQHandler ; DMA1 Channel 5
DCD DMA1_Channel6_IRQHandler ; DMA1 Channel 6
DCD DMA1_Channel7_IRQHandler ; DMA1 Channel 7
DCD ADC1_2_IRQHandler ; ADC1 & ADC2
DCD USB_HP_CAN1_TX_IRQHandler ; USB High Priority or CAN1 TX
DCD USB_LP_CAN1_RX0_IRQHandler ; USB Low Priority or CAN1 RX0
DCD CAN1_RX1_IRQHandler ; CAN1 RX1
DCD CAN1_SCE_IRQHandler ; CAN1 SCE
DCD EXTI9_5_IRQHandler ; EXTI Line 9..5
DCD TIM1_BRK_IRQHandler ; TIM1 Break
DCD TIM1_UP_IRQHandler ; TIM1 Update
DCD TIM1_TRG_COM_IRQHandler ; TIM1 Trigger and Commutation
DCD TIM1_CC_IRQHandler ; TIM1 Capture Compare
DCD TIM2_IRQHandler ; TIM2
DCD TIM3_IRQHandler ; TIM3
DCD TIM4_IRQHandler ; TIM4
DCD I2C1_EV_IRQHandler ; I2C1 Event
DCD I2C1_ER_IRQHandler ; I2C1 Error
DCD I2C2_EV_IRQHandler ; I2C2 Event
DCD I2C2_ER_IRQHandler ; I2C2 Error
DCD SPI1_IRQHandler ; SPI1
DCD SPI2_IRQHandler ; SPI2
DCD USART1_IRQHandler ; USART1
DCD USART2_IRQHandler ; USART2
DCD USART3_IRQHandler ; USART3
DCD EXTI15_10_IRQHandler ; EXTI Line 15..10
DCD RTCAlarm_IRQHandler ; RTC Alarm through EXTI Line
DCD USBWakeUp_IRQHandler ; USB Wakeup from suspend
DCD TIM8_BRK_IRQHandler ; TIM8 Break
DCD TIM8_UP_IRQHandler ; TIM8 Update
DCD TIM8_TRG_COM_IRQHandler ; TIM8 Trigger and Commutation
DCD TIM8_CC_IRQHandler ; TIM8 Capture Compare
DCD ADC3_IRQHandler ; ADC3
DCD FSMC_IRQHandler ; FSMC
DCD SDIO_IRQHandler ; SDIO
DCD TIM5_IRQHandler ; TIM5
DCD SPI3_IRQHandler ; SPI3
DCD UART4_IRQHandler ; UART4
DCD UART5_IRQHandler ; UART5
DCD TIM6_IRQHandler ; TIM6
DCD TIM7_IRQHandler ; TIM7
DCD DMA2_Channel1_IRQHandler ; DMA2 Channel1
DCD DMA2_Channel2_IRQHandler ; DMA2 Channel2
DCD DMA2_Channel3_IRQHandler ; DMA2 Channel3
DCD DMA2_Channel4_5_IRQHandler ; DMA2 Channel4 & Channel5
__Vectors_End
四： 中断GOIO 操作
编号 1 是输入线，EXTI 控制器有 19 个中断/事件输入线，这些输入线可以通过寄存器设置为任意一个 GPIO，也可以是一些外设的事件，这部分内容我们将在后面专门讲解。输入线一般是存在电平变化的信号。
编号 2 是一个边沿检测电路，它会根据上升沿触发选择寄存器(EXTI_RTSR)和下降沿触发选择寄存器(EXTI_FTSR)对应位的设置来控制信号触发。边沿检测电路以输入线作为信号输入端，如果检测到有边沿跳变就输出有效信号 1 给编号 3 电路，否则输出无效信号0。而 EXTI_RTSR 和 EXTI_FTSR 两个寄存器可以控制器需要检测哪些类型的电平跳变过程，可以是只有上升沿触发、只有下降沿触发或者上升沿和下降沿都触发。
编号 3 电路实际就是一个或门电路，它一个输入来自编号 2 电路，另外一个输入来自软件中断事件寄存器(EXTI_SWIER)。EXTI_SWIER 允许我们通过程序控制就可以启动中断/事件线，这在某些地方非常有用。我们知道或门的作用就是有 1 就为 1，所以这两个输入随便一个有有效信号 1就可以输出 1给编号 4 和编号 6 电路。
编号 4 电路是一个与门电路，它一个输入是编号 3 电路，另外一个输入来自中断屏蔽寄存器(EXTI_IMR)。与门电路要求输入都为 1 才输出 1，导致的结果是如果 EXTI_IMR 设置为 0 时，那不管编号 3电路的输出信号是 1 还是 0，最终编号 4 电路输出的信号都为 0；如果 EXTI_IMR 设置为 1 时，最终编号 4 电路输出的信号才由编号 3 电路的输出信号决定，这样我们可以简单的控制 EXTI_IMR 来实现是否产生中断的目的。编号 4 电路输出的信号
会被保存到挂起寄存器(EXTI_PR)内，如果确定编号 4 电路输出为 1 就会把 EXTI_PR 对应位置 1。
编号 5 是将 EXTI_PR 寄存器内容输出到 NVIC 内，从而实现系统中断事件控制。接下来我们来看看绿色虚线指示的电路流程。它是一个产生事件的线路，最终输出一个脉冲信号。产生事件线路是在编号 3 电路之后与中断线路有所不同，之前电路都是共用的。
编号6 电路是一个与门，它一个输入来自编号 3 电路，另外一个输入来自事件屏蔽寄存器(EXTI_EMR)。如果 EXTI_EMR 设置为 0 时，那不管编号 3 电路的输出信号是 1 还是 0，最终编号 6 电路输出的信号都为 0；如果 EXTI_EMR 设置为 1 时，最终编号 6 电路输出的信号才由编号 3 电路的输出信号决定，这样我们可以简单的控制 EXTI_EMR 来实现是否产生事件的目的。
编号 7 是一个脉冲发生器电路，当它的输入端，即编号 6 电路的输出端，是一个有效信号 1 时就会产生一个脉冲；如果输入端是无效信号就不会输出脉冲。
编号 8 是一个脉冲信号，就是产生事件的线路最终的产物，这个脉冲信号可以给其他外设电路使用，比如定时器 TIM、模拟数字转换器 ADC 等等，这样的脉冲信号一般用来触发 TIM 或者 ADC 开始转换。
产生中断线路目的是把输入信号输入到 NVIC，进一步会运行中断服务函数，实现功能，这样是软件级的。而产生事件线路目的就是传输一个脉冲信号给其他外设使用，并且是电路级别的信号传输，属于硬件级的。另外，EXTI是在 APB2总线上的，在编程时候需要注意到这点。
GPIO 中断 事件源
中断初始化函数：
typedef struct
{
uint32_t EXTI_Line; /*!< Specifies the EXTI lines to be enabled or disabled.
This parameter can be any combination of @ref EXTI_Lines */
EXTIMode_TypeDef EXTI_Mode; /*!< Specifies the mode for the EXTI lines.
This parameter can be a value of @ref EXTIMode_TypeDef */
EXTITrigger_TypeDef EXTI_Trigger; /*!< Specifies the trigger signal active edge for the EXTI lines.
This parameter can be a value of @ref EXTIMode_TypeDef */
FunctionalState EXTI_LineCmd; /*!< Specifies the new state of the selected EXTI lines.
This parameter can be set either to ENABLE or DISABLE */
}EXTI_InitTypeDef;编程要点
1) 初始化用来产生中断的 GPIO；
/**
* @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)));
}
2) 初始化 EXTI；
/**
* @brief EXTI Init Structure definition
*/
typedef struct
{
uint32_t EXTI_Line; /*!< Specifies the EXTI lines to be enabled or disabled.
This parameter can be any combination of @ref EXTI_Lines */
EXTIMode_TypeDef EXTI_Mode; /*!< Specifies the mode for the EXTI lines.
This parameter can be a value of @ref EXTIMode_TypeDef */
EXTITrigger_TypeDef EXTI_Trigger; /*!< Specifies the trigger signal active edge for the EXTI lines.
This parameter can be a value of @ref EXTIMode_TypeDef */
FunctionalState EXTI_LineCmd; /*!< Specifies the new state of the selected EXTI lines.
This parameter can be set either to ENABLE or DISABLE */
}EXTI_InitTypeDef;1) EXTI_Line：EXTI中断/事件线选择，可选 EXTI0至 EXTI19，可参考表 18-1选择。
2) EXTI_Mode：EXTI 模式选择，可选为产生中断(EXTI_Mode_Interrupt)或者产生事件(EXTI_Mode_Event)。
3) EXTI_Trigger：EXTI 边沿触发事件，可选上升沿触发(EXTI_Trigger_Rising)、下降 沿 触 发 ( EXTI_Trigger_Falling) 或 者 上 升 沿 和 下 降 沿 都 触 发( EXTI_Trigger_Rising_Falling)。
4) EXTI_LineCmd：控制是否使能 EXTI 线，可选使能 EXTI 线(ENABLE)或禁用(DISABLE)。
3) 配置 NVIC；
/**
* @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
*/misc.h
/**
* @brief NVIC Init Structure definition
*/
typedef struct
{
uint8_t NVIC_IRQChannel; /*!< Specifies the IRQ channel to be enabled or disabled.
This parameter can be a value of @ref IRQn_Type
(For the complete STM32 Devices IRQ Channels list, please
refer to stm32f10x.h file) */
uint8_t NVIC_IRQChannelPreemptionPriority; /*!< Specifies the pre-emption priority for the IRQ channel
specified in NVIC_IRQChannel. This parameter can be a value
between 0 and 15 as described in the table @ref NVIC_Priority_Table */
uint8_t NVIC_IRQChannelSubPriority; /*!< Specifies the subpriority level for the IRQ channel specified
in NVIC_IRQChannel. This parameter can be a value
between 0 and 15 as described in the table @ref NVIC_Priority_Table */
FunctionalState NVIC_IRQChannelCmd; /*!< Specifies whether the IRQ channel defined in NVIC_IRQChannel
will be enabled or disabled.
This parameter can be set either to ENABLE or DISABLE */
} NVIC_InitTypeDef;stm32f10x.h
/**
* @brief STM32F10x Interrupt Number Definition, according to the selected device
* in @ref Library_configuration_section
*/
typedef enum IRQn
{
/****** Cortex-M3 Processor Exceptions Numbers ***************************************************/
NonMaskableInt_IRQn = -14, /*!< 2 Non Maskable Interrupt */
MemoryManagement_IRQn = -12, /*!< 4 Cortex-M3 Memory Management Interrupt */
BusFault_IRQn = -11, /*!< 5 Cortex-M3 Bus Fault Interrupt */
UsageFault_IRQn = -10, /*!< 6 Cortex-M3 Usage Fault Interrupt */
SVCall_IRQn = -5, /*!< 11 Cortex-M3 SV Call Interrupt */
DebugMonitor_IRQn = -4, /*!< 12 Cortex-M3 Debug Monitor Interrupt */
PendSV_IRQn = -2, /*!< 14 Cortex-M3 Pend SV Interrupt */
SysTick_IRQn = -1, /*!< 15 Cortex-M3 System Tick Interrupt */
/****** STM32 specific Interrupt Numbers *********************************************************/
WWDG_IRQn = 0, /*!< Window WatchDog Interrupt */
PVD_IRQn = 1, /*!< PVD through EXTI Line detection Interrupt */
TAMPER_IRQn = 2, /*!< Tamper Interrupt */
RTC_IRQn = 3, /*!< RTC global Interrupt */
FLASH_IRQn = 4, /*!< FLASH global Interrupt */
RCC_IRQn = 5, /*!< RCC global Interrupt */
EXTI0_IRQn = 6, /*!< EXTI Line0 Interrupt */
EXTI1_IRQn = 7, /*!< EXTI Line1 Interrupt */
EXTI2_IRQn = 8, /*!< EXTI Line2 Interrupt */
EXTI3_IRQn = 9, /*!< EXTI Line3 Interrupt */
EXTI4_IRQn = 10, /*!< EXTI Line4 Interrupt */
DMA1_Channel1_IRQn = 11, /*!< DMA1 Channel 1 global Interrupt */
DMA1_Channel2_IRQn = 12, /*!< DMA1 Channel 2 global Interrupt */
DMA1_Channel3_IRQn = 13, /*!< DMA1 Channel 3 global Interrupt */
DMA1_Channel4_IRQn = 14, /*!< DMA1 Channel 4 global Interrupt */
DMA1_Channel5_IRQn = 15, /*!< DMA1 Channel 5 global Interrupt */
DMA1_Channel6_IRQn = 16, /*!< DMA1 Channel 6 global Interrupt */
DMA1_Channel7_IRQn = 17, /*!< DMA1 Channel 7 global Interrupt */
EXTI9_5_IRQn = 23, /*!< External Line[9:5] Interrupts */
EXTI15_10_IRQn = 40, /*!< External Line[15:10] Interrupts *//**
* @brief Initializes the NVIC peripheral according to the specified
* parameters in the NVIC_InitStruct.
* @param NVIC_InitStruct: pointer to a NVIC_InitTypeDef structure that contains
* the configuration information for the specified NVIC peripheral.
* @retval None
*/
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);
}
}
4) 编写中断服务函数；
void EXTI0_IRQHandler(void){
// EXTI_GetITStatus 函数用来获取 EXTI 的中断标志位状态，如果 EXTI 线有中断发生函
//数返回“SET”否则返回“RESET”。实际上，EXTI_GetITStatus 函数是通过读取
//EXTI_PR寄存器值来判断 EXTI线状态的。
if(EXTI_GetITStatus(EXIT_IN_EXTI_Line)!= RESET){
if(GPIO_ReadInputDataBit(KEY_IN_GPIO_Port, KEY_IN_GPIO_Pin)==1){
fn_led_toggle(LED_OUT_GPIO_Port,LED_OUT_GPIO_Pin);
}
}
EXTI_ClearITPendingBit(EXIT_IN_EXTI_Line);
}
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