目录

中断概述

什么是中断？

什么是EXTI？

EXTI初始化结构体：

 中断/事件线：

EXTI模式：

触发类型：

EXTI控制：

什么是优先级？

什么是优先级分组？

什么是NVIC？

什么是中断向量表？

按键点亮LED灯（中断法）

中断概述

什么是中断？

什么是EXTI？

EXTI初始化结构体：

typedef struct
{
//中断/事件线
uint32_t EXTI_Line; /*!< Specifies the EXTI lines to be enabled or
disabled.
This parameter can be any combination value
of @ref EXTI_Lines */
//EXTI 模式
EXTIMode_TypeDef EXTI_Mode; /*!< Specifies the mode for the EXTI lines.
This parameter can be a value of @ref
EXTIMode_TypeDef */
//触发类型
EXTITrigger_TypeDef EXTI_Trigger; /*!< Specifies the trigger signal active edge for
the EXTI lines.
This parameter can be a value of @ref
EXTITrigger_TypeDef */
//EXTI 控制
FunctionalState EXTI_LineCmd; /*!< Specifies the new state of the selected EXTI
lines.
This parameter can be set either to ENABLE or
DISABLE */
}EXTI_InitTypeDef;

 中断/事件线：

#define EXTI_Line0 ((uint32_t)0x00001) /*!< External interrupt line 0 */
#define EXTI_Line1 ((uint32_t)0x00002) /*!< External interrupt line 1 */
#define EXTI_Line2 ((uint32_t)0x00004) /*!< External interrupt line 2 */
#define EXTI_Line3 ((uint32_t)0x00008) /*!< External interrupt line 3 */
#define EXTI_Line4 ((uint32_t)0x00010) /*!< External interrupt line 4 */
#define EXTI_Line5 ((uint32_t)0x00020) /*!< External interrupt line 5 */
#define EXTI_Line6 ((uint32_t)0x00040) /*!< External interrupt line 6 */
#define EXTI_Line7 ((uint32_t)0x00080) /*!< External interrupt line 7 */
#define EXTI_Line8 ((uint32_t)0x00100) /*!< External interrupt line 8 */
#define EXTI_Line9 ((uint32_t)0x00200) /*!< External interrupt line 9 */
#define EXTI_Line10 ((uint32_t)0x00400) /*!< External interrupt line 10 */
#define EXTI_Line11 ((uint32_t)0x00800) /*!< External interrupt line 11 */
#define EXTI_Line12 ((uint32_t)0x01000) /*!< External interrupt line 12 */
#define EXTI_Line13 ((uint32_t)0x02000) /*!< External interrupt line 13 */
#define EXTI_Line14 ((uint32_t)0x04000) /*!< External interrupt line 14 */
#define EXTI_Line15 ((uint32_t)0x08000) /*!< External interrupt line 15 */
#define EXTI_Line16 ((uint32_t)0x10000) /*!< External interrupt line 16
Connected to the PVD Output */
#define EXTI_Line17 ((uint32_t)0x20000) /*!< External interrupt line 17
Connected to the RTC Alarm event */
#define EXTI_Line18 ((uint32_t)0x40000) /*!< External interrupt line 18
Connected to the USB OTG FS Wakeup from suspend event */
#define EXTI_Line19 ((uint32_t)0x80000) /*!< External interrupt line 19
Connected to the Ethernet Wakeup event */
#define EXTI_Line20 ((uint32_t)0x00100000) /*!< External interrupt line 20
Connected to the USB OTG HS (configured in FS) Wakeup event */
#define EXTI_Line21 ((uint32_t)0x00200000) /*!< External interrupt line 21
Connected to the RTC Tamper and Time Stamp events */
#define EXTI_Line22 ((uint32_t)0x00400000) /*!< External interrupt line 22
Connected to the RTC Wakeup event */

EXTI模式：

typedef enum
{
EXTI_Mode_Interrupt = 0x00, //产生中断
EXTI_Mode_Event = 0x04 //产生事件
}EXTIMode_TypeDef;

触发类型：

typedef enum
{
EXTI_Trigger_Rising = 0x08, //上升沿
EXTI_Trigger_Falling = 0x0C, //下降沿
EXTI_Trigger_Rising_Falling = 0x10 //上升沿和下降沿都触发
}EXTITrigger_TypeDef;

EXTI控制：

typedef struct
{
uint8_t NVIC_IRQChannel;
uint8_t NVIC_IRQChannelPreemptionPriority; //抢断优先级
uint8_t NVIC_IRQChannelSubPriority; //响应优先级
FunctionalState NVIC_IRQChannelCmd;
} NVIC_InitTypeDef;

//重写中断服务函数，如果检测到EXTI中断请求，则进入此函数
//该代码的功能实现了按键点灯翻转操作
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
	
	switch(GPIO_Pin){
		case GPIO_PIN_0:
			if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0)==GPIO_PIN_RESET){
				HAL_GPIO_TogglePin(GPIOB,GPIO_PIN_8);
			}
			break;
		case GPIO_PIN_1:
			if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_1)==GPIO_PIN_RESET){
				HAL_GPIO_TogglePin(GPIOB,GPIO_PIN_9);
			}
			break;
	}
}