STM32微控制器原理及应用 课件 第5章 中断系统.ppt

例：/*Enablesexternallines12and14interruptgenerationonfallingedge*/EXTI_InitTypeDefEXTI_InitStructure;EXTI_InitStructure.EXTI_Line=EXTI_Line12|EXTI_Line14;EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;EXTI_InitStructure.EXTI_LineCmd=ENABLE;EXTI_Init(EXTI_InitStructure);函数EXTI_GetFlagStatus功能描述：检查指定的EXTI线路标志位设置与否函数原形：FlagStatusEXTI_GetFlagStatus(u32EXTI_Line)输入参数：EXTI_Line---待检查的EXTI线路标志位。返回值：EXTI_Line的新状态（SET或者RESET）例：/*GetthestatusofEXTIline8*/FlagStatusEXTIStatus;EXTIStatus=EXTI_GetFlagStatus(EXTI_Line8);固态函数库的编码规则布尔型typedefenum{FALSE=0,TRUE=!FALSE}bool;标志位状态类型typedefenum{RESET=0,SET=!RESET}FlagStatus;错误状态类型typedefenum{ERROR=0,SUCCESS=!ERROR}ErrorStatus;功能状态类型typedefenum{DISABLE=0,ENABLE=!DISABLE}FunctionalState;函数EXTI_ClearFlag功能描述：清除EXTI线路挂起标志位。函数原形：voidEXTI_ClearFlag(u32EXTI_Line)输入参数：EXTI_Line----待清除标志位的EXTI线路例：/*CleartheEXTIline2pendingflag*/EXTI_ClearFlag(EXTI_Line2);函数EXTI_GetITStatus功能描述：检查指定的EXTI线路触发请求发生与否。函数原形：ITStatusEXTI_GetITStatus(u32EXTI_Line)返回值：EXTI_Line的新状态（SET或者RESET）例：/*GetthestatusofEXTIline8*/ITStatusEXTIStatus;EXTIStatus=EXTI_GetITStatus(EXTI_Line8);函数EXTI_ClearITPendingBit功能描述：清除EXTI线路挂起位函数原形：voidEXTI_ClearITPendingBit(u32EXTI_Line)例：/*ClearstheEXTIline2interruptpendingbit*/EXTI_ClearITpendingBit(EXTI_Line2);5.6NVIC库函数NVIC_DeInit：将外设NVIC寄存器重设为缺省值NVIC_PriorityGroupConfig：设置优先级分组NVIC_Init：根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器。NVIC_SetVectorTable：设置向量表的位置和偏移函数NVIC_PriorityGroupConfig功能：用来设置优先级分组（先占优先级和从优先级）函数原形：voidNVIC_PriorityGroupConfig(u32NVIC_PriorityGroup)例：/*ConfigurethePriorityGroupingwith1bit*/NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);NVIC_PriorityGroup