STM32L152 外部中断配置

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STM32L152 中断配置

1、中断配置

以外部中断0，管脚为PA0为例来进行配置

    void SYS_EXTI0Init(void)    {    GPIO_InitTypeDef GPIO_InitStructure;    EXTI_InitTypeDef EXTI_InitStructure;    NVIC_InitTypeDef NVIC_InitStructure;    //初始化PA0管脚    /* Enable GPIOA clock */    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);//打开PA口时钟    /* Configure PA0 pin as input floating */    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//输入    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;//浮空，不上拉不下拉    GPIO_InitStructure.GPIO_Pin = KEY_PIN;//管脚    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;//中断线0    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//外部中断    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//下降沿触发     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;//外部中断0类型    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;    NVIC_Init(&NVIC_InitStructure);}

2、中断服务子程序编写

中断服务子程序的函数名是已经定义好了，在固件库中中断文件中这样子说明：
这里写图片描述
在startup_stm32l1xx_mdp.s 文件中，中断函数名如下定义：

; 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

使用上面的对应的中断函数名来编写相对应的程序

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