STM32L152 外部中斷配置

STM32L152 中斷配置

1、中斷配置

以外部中斷0，管腳爲PA0爲例來進行配置

    void SYS_EXTI0Init(void)
    {
    GPIO_InitTypeDef GPIO_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    //初始化PA0管腳
    /* Enable GPIOA clock */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);//打開PA口時鐘
    /* Configure PA0 pin as input floating */
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//輸入
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;//浮空，不上拉不下拉
    GPIO_InitStructure.GPIO_Pin = KEY_PIN;//管腳
    GPIO_Init(KEY_PORT, &GPIO_InitStructure);//初始化

    /* Enable SYSCFG clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
    /* Connect EXTI0 Line to PA0 pin */
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

    /* Configure EXTI0 line */
    EXTI_InitStructure.EXTI_Line = EXTI_Line0;//中斷線0
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//外部中斷
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//下降沿觸發 
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);//初始化

    /* Enable and set EXTI0 Interrupt to the lowest priority */
    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;//外部中斷0類型
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

2、中斷服務子程序編寫

中斷服務子程序的函數名是已經定義好了，在固件庫中中斷文件中這樣子說明：

在startup_stm32l1xx_mdp.s 文件中，中斷函數名如下定義：

; External Interrupts
                DCD     WWDG_IRQHandler           ; Window Watchdog
                DCD     PVD_IRQHandler            ; PVD through EXTI Line detect
                DCD     TAMPER_STAMP_IRQHandler   ; Tamper and Time Stamp
                DCD     RTC_WKUP_IRQHandler       ; RTC Wakeup
                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_IRQHandler           ; ADC1
                DCD     USB_HP_IRQHandler         ; USB High Priority
                DCD     USB_LP_IRQHandler         ; USB Low  Priority
                DCD     DAC_IRQHandler            ; DAC
                DCD     COMP_IRQHandler           ; COMP through EXTI Line
                DCD     EXTI9_5_IRQHandler        ; EXTI Line 9..5
                DCD     LCD_IRQHandler            ; LCD
                DCD     TIM9_IRQHandler           ; TIM9
                DCD     TIM10_IRQHandler          ; TIM10
                DCD     TIM11_IRQHandler          ; TIM11
                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     RTC_Alarm_IRQHandler      ; RTC Alarm through EXTI Line
                DCD     USB_FS_WKUP_IRQHandler    ; USB FS Wakeup from suspend
                DCD     TIM6_IRQHandler           ; TIM6
                DCD     TIM7_IRQHandler           ; TIM7
                DCD     0                         ; Reserved
                DCD     TIM5_IRQHandler           ; TIM5
                DCD     SPI3_IRQHandler           ; SPI3
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     DMA2_Channel1_IRQHandler  ; DMA2 Channel 1
                DCD     DMA2_Channel2_IRQHandler  ; DMA2 Channel 2
                DCD     DMA2_Channel3_IRQHandler  ; DMA2 Channel 3
                DCD     DMA2_Channel4_IRQHandler  ; DMA2 Channel 4
                DCD     DMA2_Channel5_IRQHandler  ; DMA2 Channel 5
                DCD     AES_IRQHandler            ; AES
                DCD     COMP_ACQ_IRQHandler       ; Comparator Channel Acquisition

使用上面的對應的中斷函數名來編寫相對應的程序