STM32F4开发板----外部中断（003）

àì夳堔傛蜴生んèń 2022-05-19 20:59 242阅读 0赞

# 外部中断 #

# 1 初始化参数 #

/**
      * @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 value 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 EXTITrigger_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;

外部中断库函数

/* Exported macro ------------------------------------------------------------*/
    /* Exported functions --------------------------------------------------------*/
    
    /* Function used to set the EXTI configuration to the default reset state *****/
    void EXTI_DeInit(void);
    
    /* Initialization and Configuration functions *********************************/
    void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct);
    void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct);
    void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line);
    
    /* Interrupts and flags management functions **********************************/
    FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line);
    void EXTI_ClearFlag(uint32_t EXTI_Line);
    ITStatus EXTI_GetITStatus(uint32_t EXTI_Line);
    void EXTI_ClearITPendingBit(uint32_t EXTI_Line);

# 2 配置过程 #

\[..\] In order to use an I/O pin as an external interrupt source, follow steps  
below:  
(\#) Configure the I/O in input mode using GPIO\_Init()  
(\#) Select the input source pin for the EXTI line using SYSCFG\_EXTILineConfig()  
(\#) Select the mode(interrupt, event) and configure the trigger  
selection (Rising, falling or both) using EXTI\_Init()  
(\#) Configure NVIC IRQ channel mapped to the EXTI line using NVIC\_Init()

\[..\]  
(@) SYSCFG APB clock must be enabled to get write access to SYSCFG\_EXTICRx  
registers using RCC\_APB2PeriphClockCmd(RCC\_APB2Periph\_SYSCFG, ENABLE);

> 其中  
> EXTI\_GetFlagStatus()先判断中断是否使能，使能之后才去判断中断标志位  
> EXIT \_GetFlagStatus()直接判断状态标志位

扩展，所有stm32中断处理函数入口

WWDG_IRQHandler                     PVD_IRQHandler                                      
    TAMP_STAMP_IRQHandler               RTC_WKUP_IRQHandler                             
    FLASH_IRQHandler                    RCC_IRQHandler
    EXTI0_IRQHandler                    EXTI1_IRQHandler                              
    EXTI2_IRQHandler                    EXTI3_IRQHandler                                    
    EXTI4_IRQHandler                    DMA1_Stream0_IRQHandler                
    DMA1_Stream1_IRQHandler             DMA1_Stream2_IRQHandler                     
    DMA1_Stream3_IRQHandler             DMA1_Stream4_IRQHandler                                    DMA1_Stream5_IRQHandler              DMA1_Stream6_IRQHandler                    
    ADC_IRQHandler                      CAN1_TX_IRQHandler                                                            
    CAN1_RX0_IRQHandler                 CAN1_RX1_IRQHandler                         
    CAN1_SCE_IRQHandler                 EXTI9_5_IRQHandler          
    TIM1_BRK_TIM9_IRQHandler            TIM1_UP_TIM10_IRQHandler                
    TIM1_TRG_COM_TIM11_IRQHandler       TIM1_CC_IRQHandler          
    TIM2_IRQHandler                     TIM3_IRQHandler                                   
    TIM4_IRQHandler                     I2C1_EV_IRQHandler                          
    I2C1_ER_IRQHandler                  I2C2_EV_IRQHandler                              
    I2C2_ER_IRQHandler                  SPI1_IRQHandler                                     
    SPI2_IRQHandler                     USART1_IRQHandler                             
    USART2_IRQHandler                   USART3_IRQHandler                                    
    EXTI15_10_IRQHandler                RTC_Alarm_IRQHandler                         
    OTG_FS_WKUP_IRQHandler              TIM8_BRK_TIM12_IRQHandler                      
    TIM8_UP_TIM13_IRQHandler            TIM8_TRG_COM_TIM14_IRQHandler    
    TIM8_CC_IRQHandler                  DMA1_Stream7_IRQHandler                      
    FSMC_IRQHandler                     SDIO_IRQHandler                                   
    TIM5_IRQHandler                     SPI3_IRQHandler                                  
    UART4_IRQHandler                    UART5_IRQHandler                                
    TIM6_DAC_IRQHandler                 TIM7_IRQHandler                                  
    DMA2_Stream0_IRQHandler             DMA2_Stream1_IRQHandler                  
    DMA2_Stream2_IRQHandler             DMA2_Stream3_IRQHandler                           
    DMA2_Stream4_IRQHandler             ETH_IRQHandler                                     
    ETH_WKUP_IRQHandler                 CAN2_TX_IRQHandler                                                           
    CAN2_RX0_IRQHandler                 CAN2_RX1_IRQHandler                          
    CAN2_SCE_IRQHandler                 OTG_FS_IRQHandler                                    
    DMA2_Stream5_IRQHandler             DMA2_Stream6_IRQHandler                     
    DMA2_Stream7_IRQHandler             USART6_IRQHandler                               
    I2C3_EV_IRQHandler                  I2C3_ER_IRQHandler                                
    OTG_HS_EP1_OUT_IRQHandler           OTG_HS_EP1_IN_IRQHandler                  
    OTG_HS_WKUP_IRQHandler              OTG_HS_IRQHandler                                  
    DCMI_IRQHandler                     RYP_IRQHandler                                              
    HASH_RNG_IRQHandlerFPU_IRQHandler

这里中断函数对应关系

EXPORT  EXTI0_IRQHandler                 ----> EXTI_Line0                                          
    EXPORT  EXTI1_IRQHandler                 ----> EXTI_Line1                                        
    EXPORT  EXTI2_IRQHandler                 ----> EXTI_Line2                                             
    EXPORT  EXTI3_IRQHandler                 ----> EXTI_Line3                                      
    EXPORT  EXTI4_IRQHandler                 ----> EXTI_Line 4

> EXTI9\_5\_IRQHandler —-> EXTI\_Line 5-9  
> EXTI15\_10\_IRQHandler —-> EXTI\_Line 10-15z

3.3 初始化实例

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能SYSCFG时钟
    
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);//PA0 连接中断线0
    
     /* 配置EXTI_Line0 */
     EXTI_InitStructure.EXTI_Line = EXTI_Line0;//LINE0
     EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//中断事件
     EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //上升沿触发
     EXTI_InitStructure.EXTI_LineCmd = ENABLE;//使能LINE0
     EXTI_Init(&EXTI_InitStructure);//配置
    
        NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;//外部中断0
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;//抢占优先级0
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//子通道优先级2
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道
      NVIC_Init(&NVIC_InitStructure);//配置
    
    void EXTI0_IRQHandler(void)
    {
        delay_ms(10);    //Ï消抖
        if(WK_UP==1)    
        {
            BEEP=!BEEP; //电平翻转
        }        
         EXTI_ClearITPendingBit(EXTI_Line0); //清除LINE0上的中断标志
    }