Stm32 学习笔记3--中断.doc

Stm32 学习笔记3外部中断1、 外部中断程序编写方法 时钟（RCC）初始化 I/O端口初始化 EXTI 配置，在这里配置需要选择哪个引脚作为中断引脚 NVIC 配置，这也是比单片机多出来的部分，我们必须把NVIC 中对应的通道使能，并且设置优先级别 编写中断处理程序2、 EXTI配置void exti_config() EXTI_InitTypeDef EXTI_InitStructure;GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);/*设置PA0作为中断线路*/*EXTI_ClearITPendingBit(EXTI_Line0); */EXTI_InitStructure.EXTI_Line = EXTI_Line0; /*设置外部中断线0*/EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;/*设置线路为中断请求*/EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;/*下降沿触发*/EXTI_InitStructure.EXTI_LineCmd = ENABLE;/*线路使能*/EXTI_Init(&EXTI_InitStructure);/*初始化中断*/ EXTI_InitTypeDef 结构体 EXTI_InitTypeDef定义于文件“stm32f10x_exti.h”： typedef struct u32 EXTI_Line; EXTIMode_TypeDef EXTI_Mode; EXTIrigger_TypeDef EXTI_Trigger; FunctionalState EXTI_LineCmd; EXTI_InitTypeDef;参数说明EXTI_Line16连接PVD输出，EXTI_Line17连接RTC报警事件，EXTI_Line18连接USB唤醒EXTI_LineCmd设为ENABLE或者DISABLE 函数GPIO_EXTILineConfig：选择GPIO管脚用作外部中断线路原型：void GPIO_EXTILineConfig(u8 GPIO_PortSource, u8 GPIO_PinSource)输入：GPIO_PortSource: 选择用作事件输出的GPIO端口GPIO_PinSourceGPIO_PinSource0GPIO_PinSource1GPIO_PinSource2GPIO_PinSource3值0x000x010x020x03GPIO_PinSourceGPIO_PinSource4GPIO_PinSource5GPIO_PinSource6GPIO_PinSource7值0x040x050x060x07GPIO_PinSourceGPIO_PinSource8GPIO_PinSource9GPIO_PinSource10GPIO_PinSource11值0x080x090x0a0x0bGPIO_PinSourceGPIO_PinSource12GPIO_PinSource13GPIO_PinSource14GPIO_PinSource15值0x0c0x0d0x0e0x0f 函数EXTI_Init：根据EXTI_InitTypeDef中指定的参数初始化外设EXTI寄存器原型：void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)输入：参见结构EXTI_InitTypeDef3、 NVIC配置void nvic_config() NVIC_InitTypeDef NVIC_InitStructure;NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);/*配置主从优先级*/NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQChannel;/*外部中断线0*/NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; /*抢断优先级*/NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; /*从优先级*/NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);/*初始化NVIC*/ NVIC_InitTypeDef structure NVIC_InitTypeDef定义于文件“stm32f10x_nvic.h”： typedef struct u8 NVIC_IRQChannel; u8 NVIC_IRQChannelPreemptionPriority; u8 NVIC_IRQChannelSubPriority; FunctionalState NVIC_IRQChannelCmd; NVIC_InitTypeDef;参数说明：NVIC_IRQChannel用以使能或者失能指定的IRQ通道NVIC_IRQChannel描述WWDG_IRQChannel看门狗中断PVD_IRQChannelPVD(可编程电压探测器)通过EXTI探测中断TAMPER_IRQChannel篡改中断（入侵检测）RTC_IRQChannelRTC全局中断FlashItf_IRQChannelFLASH全局中断RCC_IRQChannelRCC全局中断EXTI0_IRQChannel- EXTI4_IRQChannel外部中断线0-4DMAChannel1_IRQChannelDMAChannel7_IRQChannelDMA通道1中断- DMA通道7中断ADC_IRQChannelADC全局中断USB_HP_CANTX_IRQChannelUSB高优先级或者CAN发送中断USB_LP_CAN_RX0_IRQChannelUSB低优先级或者CAN接收0中断CAN_RX1_IRQChannelCAN接收1中断CAN_SCE_IRQChannelCAN SCE中断EXTI9_5_IRQChannel外部中断线9-5中断TIM1_BRK_IRQChannelTIM1暂停中断TIM1_UP_IRQChannelTIM1刷新中断TIM1_TRG_COM_IRQChannelTIM1触发和通讯中断TIM1_CC_IRQChannelTIM1捕获比较中断TIM2_IRQChannelTIM4_IRQChannelTIM2全局中断- TIM4全局中断I2C1_EV_IRQChannelI2C1事件中断I2C1_ER_IRQChannelI2C1错误中断I2C2_EV_IRQChannelI2C2事件中断I2C2_ER_IRQChannelI2C2错误中断SPI1_IRQChannel- SPI2_IRQChannelSPI1全局中断SPI2全局中断USART1_IRQChannelUSART3_IRQChannelUSART1全局中断USART3全局中断EXTI15_10_IRQChannel外部中断线15-10中断RTCAlarm_IRQChannelRTC闹钟通过EXTI线中断USBWakeUp_IRQChannelUSB通过EXTI线从悬挂唤醒中断NVIC_IRQChannelPreemptionPriority ：设置NVIC_IRQChannel中的先占优先级。NVIC_IRQChannelSubPriority ：设置NVIC_IRQChannel中的从优先级。函数NVIC_PriorityGroupConfig：设置主从优先级原型：void NVIC_PriorityGroupConfig(u32 NVIC_PriorityGroup)输入：NVIC_PriorityGroup：优先级分组位长度，参阅上表函数NVIC_Init：根据NVIC_InitTypeDef结构中指定的参数初始化NVIC寄存器原型：void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)输入：指向结构NVIC_InitTypeDef的指针，取值参见NVIC_InitTypeDef structure4、 中断处理程序编写中断配置完毕后编写中断处理程序，例程如下：void EXTI0_IRQHandler(void)if ( EXTI_GetITStatus(EXTI_Line0) != RESET ) EXTI_ClearITPendingBit(EXTI_Line0);irq_tmp=1; 函数名规则：中断函数名都是定死的，必须按照startup_stm32f10x_hd.s 文件中的中断向量表中对应的中断向量函数名进行。DCD FLASH_IRQHandler ; FlashDCD RCC_IRQHandler ; RCCDCD EXTI0_IRQHandler ; EXTI Line 0本程序中使用的外部中断线0DCD EXTI1_IRQHandler ; EXTI Line 1 编写位置规则：写在stm32f10x_it.c 文件中 函数EXTI_GetITStatus：检查指定的EXTI中断请求发生原型：ITStatus EXTI_GetITStatus(u32 EXTI_Line)输入：EXTI_Line取值参见EXTI_InitTypeDef结构返回：SET或者RESET 函数EXTI_ClearITPendingBit：清除EXTI线路挂起位原型：void EXTI_ClearITPendingBit(u32 EXTI_Line)输入：EXTI_Line取值参见EXTI_InitTypeDef结构5、 主程序示例int main(void)RCC_Configuration();/*配置RCC时钟*/gpio_config();/*配置GPIO，参见学习笔记2*/ext